Best eSIM for Thailand in 2026 — Compared Honestly
Yes, we sell eSIMs ourselves — and this guide still tells you when a competitor is the better pick. Below: real 2026 prices, which networks each provider uses, and who actually wins for each kind of trip.
Head-to-head comparison
Prices are typical 2026 retail and move with promotions — treat them as a snapshot, not a promise.
| Provider | 10 GB-class plan | Unlimited option | Thai number? | Networks | Refund policy |
|---|---|---|---|---|---|
| RoamThai Our product | from $7.99 / 15 days | 7 days, from $19.99 | No (data-only) | DTAC · AIS · True | Full refund if never activated (14 days) |
| Airalo | ~$10–11 / 30 days | Yes, pricey (~$31/week) | No (data-only) | AIS · True | 30 days, technical failures only |
| Holafly | — (unlimited only) | ~$27.50 / 7 days | No (data-only) | AIS · True | Best in class — up to 6 months if unused |
| Nomad | ~$10 / 30 days | ~$16 / 7 days (cheapest unlimited) | No (data-only) | AIS · DTAC (5G) | 30 days |
| Saily | ~$10.99 / 30 days | ~$20.99 / 7 days | No (data-only) | True · AIS | Standard |
| Airport tourist SIM | 299–499 THB (~$8.50–14) | Yes — 8-day unlimited tourist SIMs | Yes — real +66 number | AIS · True · DTAC booths | None (physical product) |
Competitor prices are typical retail observed in 2026 and change often. RoamThai prices are "from" estimates — final prices at checkout.
Who wins for each trip type
🏆 Our honest verdicts
- Best overall value (7–15 day trip): RoamThai. 10 GB for 15 days from $7.99 undercuts the big brands on the most popular trip length, with all three Thai networks.
- Cheapest unlimited: Nomad. At ~$16/week it's the lowest-priced unlimited plan anywhere. If you hotspot a laptop all day, Nomad wins on price.
- Best refund guarantee: Holafly. Nobody else offers refunds up to 6 months on unused plans. You pay a premium (~$27.50/week), but the peace of mind is real.
- Need a Thai phone number: airport SIM. No travel eSIM in this table gives you a real +66 number. For Grab, banking OTPs and food delivery, buy a tourist SIM at the airport with your passport.
- Staying 30+ days: airport SIM. Long-stay tourist SIMs (30-day, high data) from 599–899 THB beat every eSIM on price per gigabyte.
How to choose: three questions
1. How much data do you actually need?
Most tourists use 1–2 GB per day (maps, messaging, social media, some video). A 10 GB plan comfortably covers a week; 15–20 GB covers two to three weeks. Hotel and café Wi-Fi in Thailand is everywhere — you need less mobile data than you think.
2. Match validity to your trip
Don't pay for 30 days when you're staying 10. eSIM validity starts at first network connection in Thailand, so a 15-day plan for a 12-day trip is the sweet spot.
3. Check your phone first
Dial *#06# — if you see an EID number, your phone supports eSIM. It must also be carrier-unlocked. Note: mainland-China iPhones (iPhone 16 and older) have no eSIM hardware at all. Full steps in our installation guide.
Bottom line: for the classic 1–2 week Thailand holiday, a mid-size eSIM bought before departure is the best combo of price and convenience. See RoamThai plans →
FAQ
What is the cheapest eSIM for Thailand?
For light use, 1 GB weekly plans from Airalo or Saily start around $3. RoamThai's 5 GB / 7-day plan starts from $4.99. For trips over 30 days, a physical tourist SIM at the airport (from 299 THB) is cheapest per gigabyte.
Which Thailand eSIM has unlimited data?
Holafly (~$27.50/week), Nomad (~$16/week) and RoamThai (from $19.99/week) all offer unlimited plans. All "unlimited" plans include a high-speed fair-use cap and then continue at reduced speed.
Do Thailand eSIMs come with a Thai phone number?
Almost never — travel eSIMs are data-only. If you need a +66 number for Grab or banking OTPs, buy a physical tourist SIM at the airport with your passport.
Which network is best for eSIM in Thailand?
AIS has the widest coverage including islands and rural areas, TrueMove H is excellent in cities, DTAC is solid nationwide. RoamThai plans connect across all three.