Best eSIM for Japan 2026: 5 Providers Priced
Japan eSIM prices checked 4 Nov 2026: ONE eSIM is cheapest at every size from 1 to 20 GB, from $1.93 for 1 GB, against Airalo, Holafly, Saily and Nomad.
Short answer: ONE eSIM has the cheapest 1 GB eSIM for Japan at $1.93 for 7 days; the next cheapest is Saily at $3.99. Prices checked 4 November 2026 across ONE eSIM, Airalo, Holafly, Saily and Nomad; the full table is below.
Japan draws tourists for its cities, food and trains, and almost everyone travelling there wants working data from the moment they land at Narita or Haneda. An eSIM is the easiest way to get it without hunting for a SIM counter. We checked prices on 4 November 2026 across ONE eSIM, Airalo, Holafly, Saily and Nomad so you can see exactly what each GB costs before you buy.
Quick answer: Japan eSIM prices by size
- 1 GB: ONE eSIM at $1.93 (7 days); next cheapest is Saily at $3.99 (7 days).
- 3 GB: ONE eSIM at $4.68 (15 days); next cheapest is Nomad at $7.00 (30 days).
- 5 GB: ONE eSIM at $7.43 (30 days); next cheapest are Airalo (7 days) and Nomad (30 days) at $10.00.
- 10 GB: ONE eSIM at $12.93 (30 days); next cheapest is Airalo at $17.00 (7 days).
- 20 GB: ONE eSIM at $22.55 (30 days); next cheapest is Airalo at $24.00 (15 days).
Japan eSIM prices compared (1 GB to 20 GB)
| Data | ONE eSIM Our price | Airalo | Holafly | Saily | Nomad |
|---|---|---|---|---|---|
| 1 GB | $1.93 (7 days) Cheapest, saves $2.06 | $4.00 (3 days) | – | $3.99 (7 days) | $4.00 (7 days) |
| 3 GB | $4.68 (15 days) Cheapest, saves $2.32 | $7.50 (3 days) | – | $7.99 (30 days) | $7.00 (30 days) |
| 5 GB | $7.43 (30 days) Cheapest, saves $2.57 | $10.00 (7 days) | – | $10.99 (30 days) | $10.00 (30 days) |
| 10 GB | $12.93 (30 days) Cheapest, saves $4.07 | $17.00 (7 days) | – | $17.99 (30 days) | $18.00 (30 days) |
| 20 GB | $22.55 (30 days) Cheapest, saves $1.45 | $24.00 (15 days) | – | $24.99 (30 days) | $26.00 (30 days) |
Holafly sells only unlimited plans for Japan, so it has no price in the GB rows; its 7-day plan is in the week table below. Nomad had its 10 GB and 20 GB plans on sale on 4 November at $16.00 and $23.00 (list prices in the table); ONE eSIM is still cheaper at both.
A week of unlimited data in Japan
| Provider | 7 days | What you get |
|---|---|---|
| ONE eSIM | $15.40 | 1 GB a day at full speed, then 1 Mbps until the next day (7 × $2.20) |
| Airalo | $26.50 | 3 GB a day at full speed, then 1 Mbps (fair use) |
| Holafly | $27.50 | No daily cap; fair use may slow very heavy use |
| Saily | $26.99 | 5 GB a day at full speed, then up to 1 Mbps |
| Nomad | $25.00 | 2 GB a day at full speed, then 1 Mbps |
For a week, ONE eSIM's 1 GB a day plan is the cheapest way to stay online all day at $15.40. The cheapest of the others is Nomad at $25.00, which gives more full-speed data a day; compare by how much you use a day, not by the word unlimited.
Networks and coverage in Japan
ONE eSIM's Japan plans run on NTT docomo, KDDI/au, SoftBank and Rakuten Mobile, all listed with 5G, and most plans support 3G/4G/5G depending on your device. Some cheaper plans run on a single network pairing (for example KDDI/au and SoftBank only), while the standard-priced plans cover all four operators — check the plan name on the destination page before buying if you need a specific carrier's coverage, for instance in rural areas where Rakuten's network is thinner.
Which eSIM should you choose for Japan?
- Short trip, light use (up to 3 GB): ONE eSIM's 3 GB plan at $4.68 (15 days), the cheapest at that size.
- Two weeks or more (5 to 10 GB): ONE eSIM's 10 GB plan at $12.93 (30 days), the cheapest at that size.
- Heavy use (20 GB): ONE eSIM's 20 GB plan at $22.55 (30 days), the cheapest at that size.
- Streaming or video calls every day: compare the unlimited plans above by how much full-speed data each gives a day.
How to set up your Japan eSIM
- Check your phone supports eSIM (most iPhones since the XS and Android flagships since 2019 do).
- Buy and install the eSIM on Wi-Fi before you fly, so the QR code or install link downloads without using mobile data.
- Turn on the new eSIM line and enable data roaming once you land in Japan, then switch off your home SIM's data to avoid charges.
Japan eSIM FAQ
- Do I need an eSIM for Japan? You don't need one, but it's usually the fastest and cheapest way for a visitor to get mobile data without buying a physical SIM or renting a pocket Wi-Fi.
- Will my eSIM work on the Shinkansen and in rural areas? Coverage depends on the network your plan uses; ONE eSIM's standard plans include docomo, KDDI/au, SoftBank and Rakuten, which between them cover the vast majority of Japan including the main rail corridors.
- Is 5 GB enough for two weeks in Japan? For normal use (maps, messaging, some social media and photos backed up over Wi-Fi), 5 GB over two weeks is generally enough; heavy streaming will use it up faster.
- Can I keep my home number active alongside the eSIM? Yes, eSIMs run as a second line alongside your physical SIM, so you can keep your home number for calls and texts while using the eSIM for data.
- What happens when I run out of data before my plan expires? On ONE eSIM's fixed-data plans you can simply top up or buy another plan from the same destination page and keep using the same eSIM.
How we check prices
We read each provider's public Japan page on 4 November 2026 and took its cheapest plan at or above each size, in US dollars before any coupon, with the validity in brackets; ONE eSIM prices are our live list prices on the same day. Prices move, so we re-check every month and keep the date on the page and in the short answer. If a number is out of date, write to support@oneesim.app and we will correct it.
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