Best eSIM for Singapore: Ranked by What You Get

Most Singapore eSIM rankings sort a table by price per gigabyte, which on this island is the least useful number available. Local prepaid packs sell 500 GB for twelve Singapore dollars, so the arithmetic rewards a product you will use four percent of, and ignores the two things that actually decide whether your week goes smoothly: whether the plan can leave a congested cell, and whether the hotspot works when your hotel Wi-Fi does not.

The best eSIM for Singapore is therefore not the one with the largest allowance or the lowest headline price, but the one whose terms survive contact with a real itinerary. So this page scores eight options on six criteria that change outcomes, then names the pick for six kinds of trip. If you want the groundwork first — the 30-day passport rule, the VoLTE requirement, the Changi counter map — the country-level groundwork covers it. This page assumes you have decided to buy and are choosing between brands.

The short answer: for a normal one-week sightseeing trip, Nomad’s 10 GB tier at about $14 or Saily’s 5 GB at $9.99 is the best eSIM for Singapore on a pure value basis. For a trip that includes Mandai, Pulau Ubin or a work laptop, a switching plan that can move between Singtel, StarHub and M1 removes the failure modes that single-network plans cannot fix. If you want a +65 number, none of the eight travel eSIMs will give you one — that is a local prepaid purchase, and the comparison changes completely.

What actually decides this: Per-gigabyte price is a broken metric in Singapore because local packs are effectively unlimited for a week’s use. The differentiators are network switching, hotspot terms, and setup friction. Three of the eight options require passport verification before the line works, which means a counter visit or an app-based eKYC step. Two have activation windows that expire if you buy too early. And the unlimited products all throttle, at thresholds ranging from 1 GB/day to 100 GB total.

What “best” has to mean on an island with four networks

Six criteria, weighted by how often they change the outcome for a real trip.

1. Network behaviour — 25%. Singapore’s four networks are close enough that coverage alone is not a tiebreaker, but congestion is local and violent: a cell inside a mall at 1 pm, a beach at 4 pm, a ballroom at 7 pm. A plan locked to one network has no answer. A plan that can move does.

2. Hotspot terms — 20%. This is the criterion that separates a holiday plan from a working plan. Several unlimited products cap tethering at 1 GB per day while advertising unlimited handset data, which is honest and useless if you are tethering a laptop.

3. Cost per usable gigabyte — 15%. Third on purpose. It matters, but only inside the 1–20 GB band where most trips live, and it stops mattering at all once you compare against a 500 GB local pack.

4. Validity flexibility — 15%. A three-day stopover should not buy a 30-day plan, and a 30-day stay should not stack four 7-day plans. The presence of 3, 5, 7, 10, 15 and 30-day tiers is a real product difference.

5. Setup friction — 15%. Time from payment to working data. Travel eSIMs: minutes. Local prepaid: twenty minutes to an hour, plus a passport and a queue. That friction is worth money to some travellers and irrelevant to others, which is why it is weighted rather than decisive.

6. Support and replacement — 10%. What happens at 11 pm when the line will not attach. Smaller brands often answer faster because the queue is shorter; the largest brands have better documentation. Test it before you fly with a pre-sales question.

One criterion is missing on purpose: “5G included”. Every option here gets 5G where the handset supports it, and Singapore’s 4G is fast enough that a 4G-only SKU is not a meaningful penalty. Also absent: device compatibility claims. That is a property of your phone, not of the plan, and the compatibility list settles it in thirty seconds.

How network switching actually behaves in Singapore

“Automatic network switching” gets used loosely, so it is worth describing what it does on the ground and what it cannot do.

A Singapore eSIM attaches to one network at a time, through a roaming agreement. Without switching, that network is fixed by the provider’s contract: your Airalo plan rides Singtel, your StarHub Traveler rides StarHub, and if that cell congests the plan has no second option. With switching, the profile holds agreements with more than one operator and re-attaches when the current one degrades.

What that looks like in practice, on a day that goes badly:

12:40, Marina Bay Sands food court, basement level. Every network is slow here; switching does not help, because the problem is the building. Expect 2–5 Mbps on anything.

16:20, Siloso Beach, Sentosa, peak crowd. This is where switching earns its keep. A single-network plan sees 1–3 Mbps while a switching plan finds a less loaded carrier and holds video.

19:45, an event at the National Stadium. 30,000 people in one cell is the hardest case in Singapore. No plan is fast here; a switching plan at least stays usable for messages.

08:10, MRT from Tampines to Raffles Place. Full signal, normal speeds, no difference between any plan.

The honest limit: switching helps most where congestion is caused by too many subscribers on one carrier, and it helps not at all where the cause is a building or a stadium. That is still worth a few dollars, because the first case is common in Singapore and the second case is survivable.

Two settings make switching work or silently disable it. Data roaming must be on for the travel line — travel eSIMs are roaming guests, and a plan cannot re-attach to a second carrier with roaming off. And automatic network selection must stay on; if you manually pin a carrier in settings to fix a slow moment, you have disabled the feature you paid for. If a plan feels stuck, toggling airplane mode forces a fresh selection rather than a manual pin.

Pelago, Klook and the marketplace problem

Singapore has a strong local habit of buying travel add-ons through marketplaces: Pelago, Singtel’s own experiences platform, and Klook both sell tourist eSIMs and SIM cards, often at prices that beat the carrier’s own site because the marketplace subsidises the acquisition.

That is a legitimate way to buy, with three caveats that are specific to how these listings work.

The product is sometimes a voucher, not a profile. A marketplace purchase can be a redemption code you exchange at a counter in a specific terminal. That is fine if you land in T2 at 3 pm and useless if your flight diverts to T4 at 1 am.

The network is rarely disclosed. A Pelago eSIM may ride Singtel or StarHub depending on the batch, and the listing usually does not say. For a city trip that is irrelevant. For a Mandai day it is the one detail you wanted.

Cancellation terms are stricter than the carrier’s. Several marketplace SIM and eSIM listings are non-refundable once purchased, including M1 and StarHub items sold through Klook. A carrier’s own site is more forgiving and more expensive; that is the trade.

If you are already buying attraction tickets on Pelago, adding a Pelago eSIM is convenient and the bundle discount is real. If you are buying only the eSIM, the carrier or a travel provider is the cleaner purchase, because you keep a refund path and a named network.

The eight options, scored

Scores are the weighted criteria above, applied to published product terms in October 2026. Network mappings come from provider documentation and user-reported carrier IDs; resellers change upstream partners without notice, so verify the network name on the plan page before paying.

Roami

The distinguishing feature is the switching layer: the plan attaches to whichever of Singtel, StarHub and M1 is performing and moves when one congests. On an island where congestion is hyper-local, that is the feature that earns the top score, and it is also the hardest thing for a competitor to copy. Plans start at $1.99 and scale by allowance; fixed-data tiers carry the full allowance as hotspot, and there is an unlimited tier.

The trade-offs are honest ones. The brand is smaller than Airalo’s, the catalogue is narrower, and travellers who want a household name for reassurance will not get it here. Support is fast because the queue is short, not because there is a huge team behind it.

Best for: trips that mix city, Sentosa, Mandai and a laptop; anyone who has been burned by a single-network plan at peak hour.

Singtel hi!Tourist

The strongest product on the island if you want a Singapore number and cannot face the counter: buy online, verify with your passport and a selfie in the hi!App, and the line activates on registration. Singtel’s hi!Tourist page lists the tiers, and they are extraordinary value — S$10 for a 7-day 500 GB pack, S$12 for 30 days with 12 GB of APAC roaming, S$15 adding 5G+ and 18 GB of APAC roaming including China, Japan and Korea, and S$30 for 700 GB with 80 GB of regional data.

Where it breaks: everything about the purchase assumes you can do eKYC with a foreign passport, that you will register close to arrival rather than weeks early, and that you accept a 30-day registration ceiling on the line itself. It also rides a single network by design, so there is no fallback in a congested cell — though on Singtel’s network that is a smaller risk than on most.

Best for: stays of a week or more, anyone who needs local calls and SMS, and travellers continuing to Malaysia, Thailand or Japan who want one bundle for the whole route.

Nomad

Fixed-data only, plainly priced, and the best per-gigabyte arithmetic in the travel eSIM band: 1 GB for $4, 3 GB for $6.50, 10 GB for $14, 20 GB for $21, 50 GB for $31. No unlimited tier to confuse a comparison, no dashboard gamification, and full hotspot on the fixed plans.

The catch is that the network depends on the SKU — Nomad publishes which one per plan rather than per brand — some plans ride StarHub, others Singtel — and there is no switching between them. That is fine inside the city and a real consideration if Mandai or Ubin is on the itinerary, because you cannot choose which one you get at checkout in every market.

Best for: travellers who know how much data they need and want to pay for exactly that.

StarHub Traveler

The value play among local carrier products from StarHub: from S$12 for 100 GB of local data over 10 to 14 days with roughly 3 GB of regional roaming, and S$30 or S$50 unlimited tiers over 28 days with fair-use thresholds at 100 GB and 150 GB. ID verification happens online, so the profile can be installed before you fly.

Two rules to respect. The eSIM must be activated within 18 days of purchase, so buying it in January for a March trip is a way to lose money. And the unlimited tiers are unlimited-with-a-threshold, which is normal but worth reading before you plan a week of tethering.

Best for: longer stays in Singapore with a Malaysia or Batam side trip, and travellers who want local-carrier data without a queue.

Airalo

The default recommendation for a reason: broad catalogue. The Airalo eSIM Singapore catalogue alone runs to eighteen plans, a well-built app, and a Singapore ladder that starts at $4 for 1 GB and reaches 50 GB for $48, with unlimited tiers from $11.50 for three days to $69 for thirty. It is the brand most travellers already trust, and nothing about it is likely to go wrong in a way you cannot fix.

Where the value thins out: the unlimited product drops to about 1 Mbps after roughly 3 GB in a day, which is a messaging-and-maps connection rather than a video one, and the Singapore plans are anchored to limited network options with no switching. At the top of the fixed ladder, Nomad and Ubigi are both cheaper per gigabyte.

Best for: first-time eSIM buyers who want a known name and a straightforward 3-day or 7-day plan. Our full Airalo review goes deeper on the app and support.

Ubigi

The quiet value pick from Ubigi: 10 GB for 30 days at about $13, running on StarHub and SIMBA, with data sharing supported and a Smartstart model that begins validity when you first connect in the destination rather than at purchase. That last detail is genuinely useful for anyone who buys a month ahead.

The limitation is the network pair. StarHub is excellent and SIMBA is the cheapest capacity on the island, but neither is Singtel, and there is no switching. For a city-and-Sentosa trip this is irrelevant. For a trip that spends a day at the Zoo and an afternoon on Pulau Ubin, it is a small gamble.

Best for: longer stays where 10 GB over 30 days matches the trip, and travellers who buy early.

Saily

Cheapest entry of the majors at Saily: $3.99 for 1 GB over seven days, with a clean ladder to 20 GB at $22.99, automatic selection between available local networks, and a privacy-first app that appeals to people who dislike being profiled. For a long weekend it is the lowest-friction four dollars in this table.

Two frictions worth naming: roaming must be enabled on the travel line for it to attach, which trips up a surprising number of Android users, and the automatic network selection means you do not control which carrier you land on — good for resilience, less good if you specifically wanted Singtel for Mandai.

Best for: short trips, light users, and anyone who wants the smallest possible spend.

Holafly

Unlimited data from Holafly, sold on simplicity: one price, no gigabyte arithmetic, $11.90 for three days through $73.90 for thirty. For a solo traveller who streams and scrolls without thinking about it, that is a genuinely comfortable product.

What you give up is the reason it scores last here: unlimited is subject to fair use, and hotspot is capped at 1 GB per day regardless of handset allowance. A family tethering two phones to one Holafly plan will hit that cap before lunch. It is also the most expensive option per day of any in the table, which only pays off for heavy use. The Holafly review has the threshold detail.

Best for: solo travellers who stream heavily, never tether, and would rather not think about gigabytes.

The price-per-gigabyte table, and why it misleads

Here is the arithmetic that most rankings stop at, with the number that actually matters alongside it.

Read the last two rows and the whole exercise collapses. A local pack is roughly fifteen times cheaper per gigabyte than the best travel eSIM, because it is not really selling data — it is selling a registered line, a number and regional roaming, with data as the giveaway. No travel eSIM can match that, and none should try.

So the question is not “which is cheapest per gigabyte”. It is “what am I paying for with the premium”. Three answers, and they are all legitimate:

Time. A travel eSIM is working before you collect your bag. A local pack costs twenty minutes at a counter after a long flight, or a shop visit in town.

Paperwork. No passport registration, no 30-day expiry attached to your identity, no three-line cap.

Reversibility. A travel eSIM can be bought, tested and abandoned cheaply. A registered prepaid line is a commitment with a refund policy measured in “no”.

If none of those three is worth $5 to you on a given trip, buy local. That is a real answer, not a hedge.

Where each of the eight breaks, and how it looks

Failure modes, not marketing weaknesses. These are the ones that show up in complaints.

The one checkpoint that catches most of them

Before you pay, ask two questions in one message to support: which network does this plan use in Singapore, and what is the hotspot allowance. A specific answer tells you the provider knows its own product. A vague one tells you what your 11 pm will look like.

If you have a long weekend

Three days, hand luggage, no laptop. Two defensible purchases: Saily’s 1 GB for $3.99 if you intend to live on hotel and mall Wi-Fi and only need maps, Grab and messaging, or Nomad’s 3 GB for $6.50 if you will post photos and take a couple of video calls.

What a long weekend actually consumes: arrival day is 300–500 MB because Grab, maps and a hotel chat all run at once; a full day of sightseeing with photos is 600–900 MB; an evening of social scrolling in the hotel is 400 MB unless you switch to Wi-Fi. Three days lands at 1.5–2.5 GB. The 3 GB tier is the honest buy, and the $2.50 difference from 1 GB buys you the freedom not to think about it.

Skip the local prepaid pack here. At three days you would use under 2% of a 500 GB allowance and pay for it with twenty minutes at a counter and a 30-day line you will never use again.

If you have one full week

The default recommendation: Nomad’s 10 GB at about $14, or Saily’s 5 GB at $9.99 for a light user who streams nothing. Both carry 30-day validity, so a delayed flight home costs you nothing.

A costed week, so you can check the model against your own habits:

That total leaves room for a rain day of streaming, which is the realistic Singapore risk: a two-hour downpour in an Orchard mall is 1.5 GB if you watch video on mobile data instead of mall Wi-Fi. The 10 GB tier absorbs it; a 5 GB tier does not, comfortably.

If the week includes Mandai, the Southern Ridges and a ferry to St John, pay the small premium for a switching plan. The single-network gamble is cheap to take and annoying to lose.

If you are staying two weeks or more

Two weeks of normal use lands at 12–18 GB, which puts you between tiers on most providers — above the 10 GB rung, below the 20 GB one, and exactly where the pricing is least generous. Two sensible routes: 20 GB from Nomad at $21, or a local pack at S$12–15 with 500 GB and a number attached.

At this length the local pack starts to make genuine sense. The registration overhead is amortised over fourteen days, the regional roaming bundle covers a Johor Bahru or Batam side trip without a second purchase, and the number is useful for a clinic, a delivery or a lease. The prepaid rules and timing guide has the counter timings if you go that way.

The thing that catches people at this length is not data, it is validity. A 7-day plan renewed twice costs more than a 30-day plan bought once, and most travel providers cannot extend a live plan mid-cycle — you buy a new one and switch profiles. Check the renewal path before you rely on it for a fortnight.

If a laptop is coming

Fixed data with full-allowance hotspot, 20 GB minimum. The arithmetic: a 30-minute video call uses about 270 MB, so four calls a day is roughly 1 GB, before email, sync and file transfers. A 20 GB plan covers two working weeks comfortably. A 10 GB plan covers one, tightly.

Avoid any unlimited plan with a 1 GB per day hotspot cap. It will work on day one and fail exactly when you are presenting. The tell is in the terms, not the marketing: if the plan page says “unlimited data” and the FAQ mentions tethering separately, assume the tethering number is the real one.

Two smaller working-trip details. Hotel Wi-Fi in Singapore is fast but variable — shophouse conversions and hostels throttle harder than the big chains — so a plan you can tether is a genuine backup rather than a redundancy. And if you are presenting on a video call, a wired-free setup with the phone in a window beats a hotspot in a hotel room with a concrete core.

If you are travelling with family

Two separate plans beat one shared hotspot. Tethering two phones to one handset drains the battery by early afternoon, and the parent carrying the hotspot cannot wander off to the next stall. Two 5 GB plans at $9.99 each cost about the same as one 20 GB plan and remove an argument before it starts.

For children old enough to have a phone, remember the age-15 minimum on prepaid registration — a second reason travel eSIMs suit families with teenagers, since a data-only profile needs no identity at all.

If the family splits up for the afternoon, a per-person plan also means the group chat works both ways, which a single hotspot cannot do once everyone is out of range.

If the trip continues to Malaysia, Japan or Bali

One regional bundle often beats two country plans. Singtel’s hi!Tourist S$15 tier includes 18 GB of APAC roaming covering Malaysia, Indonesia, Thailand, Hong Kong, China, Japan and Korea, which makes an eSIM for Singapore and Japan practical in a single purchase. StarHub’s Traveler tiers carry similar regional allowances, and its S$30 unlimited tier extends to 80 GB of APAC roaming.

The alternative is a regional Asia eSIM from a travel provider, usually cheaper than two country plans but less precise about which network you land on in each country. The trade is the same one that runs through this page: certainty costs a few dollars, and so does its absence.

For an itinerary that is mostly Singapore with a two-day Johor Bahru add-on, the local bundle is the clean answer. For Singapore plus Japan as separate legs, price both — Japan’s eSIM market has different winners, and a Japan-specific plan usually beats a regional one on price per gigabyte once you are staying a week.

What to check on the checkout page

Five lines of small print that decide whether the Singapore eSIM plan you are buying does what you expect. None takes more than a minute.

The validity start. “From first connection” is safe. “From purchase” is not, if you are buying early. “Must activate within 18 days” is a deadline, not a feature.

The hotspot line. Look for the words hotspot, tethering or data sharing, and a number. If the plan says unlimited and the hotspot line is missing, assume the worst.

The network name. If the page names Singtel, StarHub, M1 or SIMBA, you can reason about coverage. If it says “top local networks”, you cannot.

The top-up path. Fixed plans often cannot be extended. Running out on day five of a ten-day trip means buying a second plan and switching profiles, which is fine if you know, and expensive if you discover it at the point of failure.

The refund condition. “Money back” usually means unused and never connected. A plan that connected once and failed is a replacement case, not a refund case.

Buy timing: what “valid from first connection” really means

Three products in this table start their clock in three different ways, and getting it wrong wastes days.

On first network connection. Most travel eSIMs, including Airalo, Nomad and Saily. Safe to buy weeks ahead; the plan waits until it sees a Singapore network. This is the behaviour you want if you plan early.

On purchase. Singtel’s hi!Tourist states validity begins at purchase, with registration required within 90 days. Practically, that means buying three weeks early risks losing days, and registering while still abroad can start the plan before you land. Buy within a few days of flying, register the day before arrival, and confirm the activation date in the app.

On activation within a window. StarHub’s Traveler eSIM must be activated within 18 days of purchase. Fine for a trip booked a fortnight out, wrong for one booked in spring.

How to test a plan in the first hour

Attach, check the network name, load a map route, and tether one device. Four checks, five minutes, all doable inside the terminal while you still have the option to buy something else. A speed test is a worse test than a map, because a captive portal will happily let a speed test succeed and block real traffic.

Questions about picking a Singapore eSIM

Which is the best eSIM for Singapore overall? For a normal week, Nomad’s 10 GB at about $14 on value, or a switching plan if the itinerary leaves the city core. Asked without a trip description, a switching plan is the only defensible general answer, because it removes a failure mode rather than saving four dollars.

Is Airalo or Holafly better for Singapore? Airalo: fixed data from $4, full hotspot, cheaper for anyone who does not stream constantly. Holafly: unlimited, simpler, and 1 GB/day of hotspot. Below seven days Holafly’s $27.50 can undercut a 20 GB fixed plan; above it, Airalo wins on price and flexibility.

Which is the best eSIM for Singapore under $10? Nomad’s 5 GB at $9 or Saily’s 5 GB at $9.99, both on 30-day validity with full hotspot. Under $10 the allowances get small enough that anything longer than a long weekend needs the tier above.

Which is the best eSIM Singapore sells locally? The best local product is Singtel’s hi!Tourist S$10 seven-day pack, which includes 500 GB, a +65 number and unlimited local calls for about $7.70. It is not the cheapest per gigabyte — nothing is — but it is the only local tier that combines a number, real roaming and a price under a taxi from the airport. StarHub’s S$12 Traveler eSIM undercuts it on data-per-dollar for a longer stay, and M1’s S$12 fifteen-day pack is the best fit for a short trip that needs calls.

Do any of these give me a Singapore phone number? No. All eight travel eSIMs are data-only. A +65 number requires a locally registered prepaid eSIM from Singtel, StarHub or M1, and the registration rules are covered in the Singapore eSIM guide.

Is there one best eSIM in Singapore for everybody? There is no single best eSIM in Singapore, because the purchase splits three ways: data-only travel plans win on convenience, local prepaid wins on price and calling, and marketplace bundles win when you are booking attractions anyway. Pick the constraint that matters most and the answer follows.

Is the cheapest plan always the worst? No — Singapore is unusual in that cheap plans work well, because every network covers the island. Cheap goes wrong at the edges: Mandai, Pulau Ubin, offshore islands, and inside large event venues.

How much data does a Singapore trip use? Four to eight gigabytes for a normal week without streaming, ten to twelve with social video, twenty or more with daily video calls. Hotel Wi-Fi absorbs most volume if you let it.

Can I buy one plan for two phones? Only by tethering, and only if the plan’s hotspot is not capped. Two separate small plans are usually cheaper than one large plan plus a battery pack.

Which provider has the best support? Test before you travel: send a pre-sales question about Singapore network and hotspot terms, and time the reply. That response time is what you will get at midnight in Tanjong Pagar.

What if my phone does not support eSIM? You buy a physical SIM, and the entire comparison above stops applying — a physical tourist SIM is a local prepaid product with passport registration. The SIM card versus eSIM breakdown covers that path.

The pick in one line

A week in the city: Nomad 10 GB. A week that leaves the city: a switching plan. Two weeks or a work laptop: 20 GB fixed with full hotspot. A month: local prepaid with a number, or a 30-day travel plan if you refuse the queue.

Current Singapore tiers and prices sit on the Singapore eSIM page, the tier-by-tier arithmetic is in the tier arithmetic in detail, and if you are still deciding between form factors, what a tourist should buy, and when, runs through arrival day minute by minute.