Travel eSIM or Telco Roaming? The 8 Cheapest Ways to Get Data Overseas From Singapore in 2026, and Why a $0.99 Pass Beats Every eSIM

This is the number that breaks the category. M1 charges $0.99 a day for 3GB of roaming data across 100+ destinations, Japan, South Korea, Taiwan, China, Hong Kong, Australia, the United States and the United Kingdom included. Seven days in Japan is S$6.93 for 21GB, which is less than a third of the cheapest travel eSIM here. Three details make it better than it sounds. The $0.99 charge only lands on days you actually use data, so a day spent entirely on hotel WiFi costs nothing. The 24-hour window starts the moment data is first used rather than at midnight, and the unused balance carries across every country you touch in that window, so a Singapore to Hong Kong to London routing is still one charge. And when the 3GB runs out, the next 3GB starts automatically at the same $0.99 with no throttling. The gate is the plan: $0.99 roaming comes with all M1 Bespoke SIM-only plans (from $11.95/mth) and with Bespoke Flexi plans for new sign-ups or recontracts from 22 April 2026. If you are on an older M1 plan you fall back to the standard Daily Passport, still 3GB per 24 hours but $2.95 for Malaysia, Thailand and Indonesia, $3.95 for Japan and China, $5.95 for Australia and $8.95 for Europe, across 78 destinations. M1 also gives every line a free Data Roaming Cap that holds Daily Passport and pay-as-you-go charges under $100.

SIMBA does not sell you a roaming pass because it does not need to. Every SIMBA mobile plan ships with roaming data built in, and the tier that matters for travel is APAC (15 countries), which SIMBA's own roaming page confirms includes Japan, South Korea, Taiwan, China, Australia, Vietnam, the Philippines, India, Macau, Brunei, Cambodia, Bangladesh, Laos, Myanmar and New Zealand. The $12 for 30 days plan carries 18GB of that APAC data plus 8GB across 60+ Group A countries; $15 lifts APAC to 25GB; $18 gives 30GB, $20 gives 50GB and $25 gives 80GB, all alongside 600GB to 800GB of local and neighbour-country data. In other words a SIMBA subscriber flying to Tokyo pays nothing extra at all, which is the only S$0 line in this comparison. Unused data, talktime and SMS roll over for up to six cycles when you renew, and voice roaming is free over VoLTE between covered destinations. Two things to watch. Once the roaming quota is used, APAC data is charged at $4/GB, which is dearer than every eSIM here, so heavy users should still buy a pass. And SIMBA states data roaming is currently unavailable in Myanmar despite it being on the list. Buying a 90-day block saves $6 on the $12 and $15 plans.

StarHub quietly made its roaming packs four times bigger and left the prices alone. DataTravel Asia Pacific, which covers Japan, South Korea, Taiwan, China, Hong Kong, Australia and 14 more, now gives 2GB plus 6GB bonus for $16 or 3GB plus 9GB bonus for $20, both valid 30 days. That $20 pack works out to S$1.67 a gigabyte, cheaper per GB than any travel eSIM in this list. The Global tier does the same thing at 8GB for $40 and 12GB for $50, and there is a bare 1GB for $6 over 3 days if you only need maps for a weekend in KL. StarHub's own page dates the promotion to 31 December 2026. Three practical notes: activation is through the StarHub app or by SMS (DT1, DT2 or DT3 to 78989), a top-up before the pack expires extends validity up to 30 days from the new activation, and if you blow through the data anyway the overage is capped at the DataTravel Unlimited rate of $30 a day rather than running open-ended. DataTravel Everywhere, the tier for the long-tail destinations, is the one to avoid unless you must have it: 1GB for $80.

ReadyRoam Asia is $18 for 6GB across 19 destinations including Japan, South Korea and Australia, valid 30 days. The part worth reading twice sits in Singtel's own roaming FAQ document: when you finish that first 6GB pack, Singtel automatically provisions an unlimited data bundle with the same coverage, price and validity, rather than another 6GB. It applies to ReadyRoam Neighbours 6GB, Asia 6GB and Worldwide 6GB from 22 May 2026, with auto-activation from 26 May 2026. So the realistic worst case for a month in Japan is $18 plus $18 for unlimited data, which is S$36 against S$88 for Airalo's 30-day unlimited and S$100 for Holafly's. Read the fine print carefully though. The unlimited bundle is charged at the same price, so it is not free. It only unlocks when you exceed the first 6GB pack for that coverage, never on a second pack you buy manually. And there is no extension of the 30-day validity. Cheaper tiers: ReadyRoam Neighbours is 1GB for $5 or 6GB for $12 across Malaysia, Indonesia and Thailand. Dearer tiers: Worldwide 6GB is $40, and ReadyRoam Others is 1GB for $60. You can subscribe up to 30 days ahead, and validity runs on Singapore time, ending at 2359h SGT on day 30.

If you cannot use a Singapore telco pass, Nomad is where the eSIM shopping should start. Set the store to SGD and Japan prices read 1GB for 7 days at S$5.08, 3GB for 30 days at S$8.88, 5GB at S$12.69, 10GB at S$20.31 (marked down from S$22.85), 20GB at S$29.19 (from S$33) and 50GB at S$44.42. That 10GB plan undercuts Airalo's equivalent by nearly S$3, and Nomad's regional plans are where it really pulls away: APAC covering 14 or 21 destinations starts from S$0.49 a gigabyte, and a China, Japan and Korea combined plan starts from S$1.97 a gigabyte. Unlimited plans exist too at S$13.96 for 3 days, S$31.73 for 7, S$52.04 for 14 and S$62.19 for 21. New users get a free trial eSIM with 1GB, which is genuinely enough to land, order a train ticket and find the hotel. Two operational catches: you must activate within 60 days of purchase or the plan starts by itself and the clock runs, and the plan begins automatically the moment the phone connects to a Japanese network, so do not switch the line on during a layover you did not budget for. Networks are KDDI au and SoftBank.

Airalo is the default name in this category and it earns part of that. Its Singapore store prices everything in Singapore dollars, so there is no foreign-transaction fee stacked on top, and the App Store lists the publisher as Airgsm Pte. Ltd., a Singapore company. Japan fixed-data packages read 1GB for 3 days at S$5.50, 3GB for 7 days at S$10.50, 5GB for 7 days at S$13.00, 10GB for 7 days at S$22.00, 10GB for 30 days at S$23.00 and 20GB for 30 days at S$32.00. Unlimited runs S$15 for 3 days, S$34.50 for 7, S$44 for 10 and S$88 for 30. Regional cover starts at S$5.50 for Asia and S$11.00 for Global, which is the reason to pick Airalo over a cheaper rival: if your itinerary is four countries in three weeks, one regional eSIM beats four local ones. Where it loses is the straight price comparison. Airalo's 10GB Japan plan at S$23.00 costs S$2.69 more than Nomad's and S$3 more than StarHub's 12GB pack, and its 30-day unlimited at S$88 is more than double what a Singtel line pays for the same thing. Like every eSIM here it is data only, with no Singapore number, so OTPs and calls still need your usual SIM switched on.

Changi Travel Services sells its own Travel eSIM across 26 destinations, and it is the only provider here you can raise a WhatsApp with a Singapore number when something goes wrong. Japan is sold as a daily allowance rather than a pot of data: 500MB of high speed a day for 7 days is S$4.31, and 2GB a day for 7 days is S$13.65, which is 14GB of high-speed data for less than Airalo charges for 10GB. There is even a one-day 500MB plan at S$0.10 if you land at midnight and only need to book a taxi. Read the word unlimited carefully here, because it means something specific: once the daily high-speed allowance is gone the connection drops to 128kbps for the rest of that day, which is enough for text messages and nothing else. Other terms straight off the product page: hotspot and tethering are supported, the QR code is valid 60 days and can only be scanned once, the eSIM cannot be re-added once removed, one-off eSIMs cannot be topped up (buy the Reloadable version if you might extend), and there are no refunds after the QR is issued. The banner on its eSIM page currently carries 12% off with code EARLYBIRD12RE for Reloadable and EARLYBIRD12E for One-Off, no cap, applied at checkout, valid 24 to 31 August 2026 and excluding Thailand DTAC, Truemove and Taiwan ChungHwa.

Holafly sells days, not gigabytes, and its Singapore store prices Japan at S$5 for 1 day, S$16 for 3, S$27 for 5, S$37 for 7, S$50 for 10, S$68 for 15 and S$100 for 30, all unlimited on KDDI and SoftBank. That is the most expensive line in this roundup by a distance: a week in Japan costs more than five times the M1 pass and roughly S$15 more than the priciest travel eSIM here. What you buy for the premium is not having to think about data at all, which genuinely matters if you are working on the road or navigating and streaming all day. Two conditions decide whether it is worth it for you. Hotspot sharing is capped at 1GB a day, so it is unlimited for your own phone and rationed for the laptop or your travel companion, which quietly kills the classic use case of one eSIM covering two people. And the fair usage policy allows speed to be reduced for no more than one day at a time before restoring. Two things in Holafly's favour: every plan includes Always On, a 1GB monthly backup allowance in 150+ countries that keeps you reachable after the plan ends, and the refund window runs up to six months for service withdrawal, which is more generous than anyone else here.