Japan eSIM Price Guide 2026: What You Pay per GB and per Day
Roami Team
Roami offers reliable eSIM plans, serving over 1 million travelers annually, and supports automatic local network switching to help travelers stay connected globally.
📑 Table of Contents
Short answer: a data-only Japan eSIM costs roughly $1.2–4.0 per GB, and a full trip usually lands between $4 and $25. Unlimited plans run about $2.5–4.1 per day. Light travellers on a one-week trip typically spend under $15; heavy users who stream and hotspot should budget $25–70.
The numbers below are the tiers listed by the major providers in September 2026. Prices move often — treat every figure as “around”, and confirm at the provider’s checkout page before you buy.
1. How much does a Japan eSIM cost in 2026?
Three price bands cover almost every plan on the market:
- Entry (about $3–5): 1GB for a few days, or 500MB for a single day. Enough for maps and messaging on a short city break.
- Mid (about $8–25): 3–20GB valid for 7–30 days. This is where most travellers buy.
- Unlimited (about $11–74): priced by duration rather than data, roughly $2.5–4.1 per day, cheapest on 30-day plans.
What actually drives the price differences
Two structural facts explain most of the price differences. First, longer validity costs proportionally less — a 5GB plan over 30 days is barely more expensive than the same 5GB over 7 days. Second, unlimited is priced by the day, so it only wins when your daily consumption is high enough to beat a fixed bundle.
A third factor is your handset. If your phone does not support eSIM — most iPhones from the XS (2018) onward and recent Android flagships do — you are pushed toward a physical tourist SIM, which generally costs more per gigabyte and has to be bought after you land.
2. Japan eSIM price per GB and per day compared
| Provider | Entry price | Mid-tier example | Unlimited (representative) | Network |
|---|---|---|---|---|
| Airalo | ~$4.00 / 1GB / 3 days | 10GB / 30 days ≈ $18; 20GB / 30 days ≈ $25 | 7 days ≈ $26.50; 30 days ≈ $69 | SoftBank / KDDI |
| Ubigi | ~$2.90 / 500MB / 1 day | 10GB / 30 days ≈ $17; 25GB / 30 days ≈ $35 | 7 days ≈ $26 | KDDI au + Docomo |
| Holafly | unlimited only | — | 7 days ≈ $27.50; 30 days ≈ $73.90 | KDDI / SoftBank |
| Nomad | ~$4.00 / 1GB / 7 days | 10GB / 30 days ≈ $16; 50GB / 30 days ≈ $35 | 7 days ≈ $25; 21 days ≈ $49 | KDDI / SoftBank |
Fixed-data tiers: the per-gigabyte curve
Per-GB rates fall sharply as the bundle grows. At the entry tier you are paying $3–4 per GB; by 20–50GB the effective rate is closer to $0.7–1.25 per GB. If you are confident about your usage, buying the larger bundle up front is almost always better value than topping up twice.
One structural cost driver is easy to miss: network generation. A 4G LTE plan can be priced below a 5G-capable one in the same country, and a plan that routes through overseas servers costs its provider less to run than one that terminates locally. That is part of why two plans with identical data allowances can still be priced differently — and why the cheapest tier is not automatically the best fit.
Unlimited plans are priced by the day
For unlimited plans, compare the per-day rate instead: a 30-day unlimited plan at around $69 works out near $2.30 per day, while a 3-day plan at $11.50 is closer to $3.80 per day. The longer you stay, the better unlimited looks.
3. The Full Japan eSIM Price Ladder, Provider by Provider
Entry prices make for tidy headlines, but the tier you actually buy sits in the middle of the ladder. This is what the major providers list for Japan in September 2026, arranged by size rather than by marketing order.
| Provider | 1 GB entry | 3–5 GB | 10 GB | 20–25 GB | 50 GB | Unlimited |
|---|---|---|---|---|---|---|
| Airalo (Moshi Moshi) | $4.00 / 1 GB / 3 days | 5 GB / 30 days $11 | 10 GB / 30 days $18 | 20 GB / 30 days $25 | not sold | 7 days $26.50; 30 days $69 |
| Ubigi | $3.50 / 1 GB / 3 days | 3 GB / 15 days $7.50 | 10 GB / 30 days $16.50 | 25 GB / 30 days $32 | 50 GB / 30 days $55 | 7 days ≈$25; 30 days ≈$65 |
| Nomad | ≈$4 / 1 GB / 7 days | 5 GB / 30 days $10 | 10 GB / 30 days $16 | 20 GB / 30 days $23 | 50 GB / 30 days $35 | 7 days $25; 21 days $49 |
| Saily | $3.99 / 1 GB / 7 days | 5 GB / 30 days $10.99 | 10 GB / 30 days $17.99 | 20 GB / 30 days $24.99 | not sold | 7 days $28.99; 30 days $71.99 |
| Holafly | unlimited only | — | — | — | — | 7 days $27.50; 30 days $73.90 |
List prices only, read in September 2026, before any promotion is applied. Providers run seasonal offers and doubled-data promotions often enough that the list price works as a ceiling rather than a floor.
What the ladder tells you
Three patterns hold across every provider. The effective rate at the 1 GB entry tier is roughly $3.50–4.00 per gigabyte, which is the most expensive data you will buy. By 20–50 GB the same data costs about $0.70–1.25 per gigabyte — a four- to five-fold improvement for buying more than you think you need. And the 10 GB tier, which is the single most-purchased size for a two-week trip, clusters tightly between $16 and $18 whichever brand you choose, which is why brand loyalty rarely saves money at that size.
The one place providers genuinely differ
Below 5 GB the ladder stops being a ladder and becomes a set of different products. Ubigi sells small volumes with long validity, so 3 GB over 15 days costs less than Airalo’s 3 GB over 7 days. Nomad sells mid volumes with very long validity, which suits slow travellers. Holafly refuses to sell fixed data at all. If your trip is short and light, that spread matters more than the headline entry price everyone advertises. For the network and feature side of the same decision, the provider-by-provider comparison normalises cost per gigabyte against carriers and routing types.
4. What a Japan eSIM Costs for 5, 7, 10, 14 and 30 Days
Trip length, not data, is the variable most travellers get wrong. Here is the same market priced by the trip people actually take, using list prices and a moderate-usage assumption of about 1–1.5 GB a day.
| Trip | Realistic need | Sensible shape | Typical cost | Effective per day |
|---|---|---|---|---|
| 5 days | 5 GB | Airalo 5 GB / 30 days, or Nomad 5 GB / 30 days | $10–11 | ≈$2.00–2.20 |
| 7 days | 10 GB | Ubigi 10 GB / 7 days, or Airalo 10 GB / 7 days | $14–17 | ≈$2.00–2.40 |
| 10 days | 15–20 GB | Airalo 20 GB / 15 days | $24 | ≈$2.40 |
| 14 days | 20 GB | Nomad 20 GB / 30 days, or Ubigi 25 GB / 30 days | $23–32 | ≈$1.60–2.30 |
| 30 days | 30–50 GB | Nomad 50 GB / 30 days, or unlimited at $65–74 | $35, or $65–74 | ≈$1.17, or $2.20–2.50 |
Read the last column rather than the middle one. A 30-day 50 GB bundle at about $35 works out near $1.17 a day, which is less than half the daily cost of a one-week plan — the reason long stays almost always look cheap per day and short trips almost never do.
The days you pay for and the days you can use
There is a second clock running that the price table hides. A plan with 30 days of validity gives you 30 days from the moment it starts, and when it starts depends on the provider. Ubigi’s Japan plans begin on arrival in Japan, so installing the profile at home weeks early costs you nothing. Airalo’s rule varies by package: some plans start counting when you first connect to a network in Japan, while others start when you install the eSIM — which is exactly how people lose a week of a paid plan before their flight leaves.
The routine that is safe for both: buy early, install early, and leave the Japan line switched off in your phone’s settings until you land. Installing a profile and enabling it are two different actions, and only the second one should happen in Japan. One more expiry quirk worth knowing: an Ubigi Japan plan that is never activated lapses six months after purchase, so buying in January for a July trip is fine, and buying in June for the following January is not.
5. Cheapest Japan eSIM by trip length
Prices checked September 2026; confirm current rates before purchase.
| Trip length | Suggested data | Best-value shape | Typical cost |
|---|---|---|---|
| 3–5 days | 3–5GB | Airalo 3GB / 7 days or Nomad 5GB / 30 days | about $8–10 |
| 7–10 days | 5–10GB | Nomad 10GB / 30 days or Airalo 10GB / 30 days | about $16–18 |
| 14–21 days | 10–20GB | Airalo or Nomad 20GB / 30 days; or unlimited if you stream | about $23–25 fixed, or $41–50 unlimited |
| 30 days or more | 20–50GB | Nomad 50GB / 30 days, or Ubigi monthly | about $35 fixed, or $69–74 unlimited |
How to read the recommendation table
The pattern to notice: at two weeks, fixed data still wins comfortably; unlimited only becomes competitive for travellers who genuinely use 2GB or more per day. If you are unsure how much you need, our breakdown of how much data a Japan trip actually uses is the place to start.
Matching the plan to the itinerary, not the average
For itinerary-specific picks rather than averages, the Japan travel eSIM guide matches a plan to your trip length, and the multi-country East Asia plans covers cross-border routes where one regional plan can replace three.
6. Japan eSIM fixed bundles vs unlimited plans: which is cheaper?
Two worked examples, using the mid-tier rates above.
Light user, 7 days, about 0.5GB per day (3.5GB total). A 5GB fixed plan at roughly $10 covers the week with headroom. Unlimited for the same 7 days starts around $25. Fixed data saves about $15.
Heavy user, 14 days, about 3GB per day (42GB total). Fixed data means stacking bundles: 20GB at about $24 plus a second 20GB top-up lands near $45–50. A 14-day unlimited plan sits around $41–50 and removes the risk of running dry. Here unlimited wins on convenience, and roughly ties on price.
One more variable shapes that maths: what an “unlimited” plan actually allows before it throttles. The Japan eSIM unlimited data guide sets out the daily caps and hotspot limits in detail.
The crossover, worked through
The crossover is around 1.5–2GB per day. Below it, buy data; above it, buy days.
7. Japan eSIM deals, promo codes and discounts
Discounts on Japan eSIMs come from three places, and only one of them is reliable.
- Provider promotions. Airalo and Nomad both run introductory and seasonal offers, and Nomad in particular has offered doubled-data promotions for new users. These are genuine but time-limited.
- Marketplace coupons. Travel platforms that resell eSIMs sometimes carry a first-order code. Worth a check, but stock and terms vary.
- Bundle and multi-country plans. If your itinerary includes Korea or Taiwan, a regional Asia plan is often cheaper than two country plans — the same logic that makes longer validity cheaper applies to wider coverage.
Which discounts are worth chasing
Treat “discount code” listicles with caution: many are affiliate pages recycling expired codes. The reliable discount is the structural one — buy the longer validity or the larger bundle and the per-GB price drops on its own.
8. Hidden Japan eSIM costs the headline price leaves out
The five costs that change the final bill
The advertised price is rarely the whole bill. Watch for:
- Fair-use throttling on unlimited plans. Airalo’s unlimited drops to about 1 Mbps after 3GB in a day; Nomad’s after 2GB. You still pay the same, but you get much less speed.
- Hotspot restrictions. Some unlimited plans cap tethering to around 500MB–1GB per day, which matters if you planned to work from a laptop.
- Top-up pricing. Buying more data later can cost more per GB than the original bundle. Estimate generously up front.
- No refunds after activation. Most providers refund only if the QR code has not been scanned, so a wrong purchase is hard to undo.
- Currency conversion. Prices shown in your local currency include a conversion margin; the USD price is usually the base.
9. What a Failed Activation Costs You
The cheapest plan is not the cheapest plan if it does not connect. Refund rules are the part of Japanese pricing that varies most between sellers, and they are worth reading before you pay rather than after.
Three patterns cover most of the market. Some sellers offer a generous window measured in months and cover incompatible or locked handsets, as long as the QR code has never been scanned — Holafly is the clearest example. Others treat refunds as a technical-fault remedy only, and route change-of-mind requests into store credit rather than money back, which is how Airalo’s policy works. And at least one Japan-focused seller publishes a no-refund line on its unlimited product while shipping a free pocket WiFi unit as a physical fallback if the eSIM will not connect after troubleshooting, which is a different answer to the same problem.
The reason this matters is the cost of the alternative. A data SIM bought from an airport SIM counter after a failed eSIM runs to roughly $20–33 for a short allowance, and a roaming day pass from a US carrier runs $10–12 a day. A refund window of months is worth more than a two-dollar price difference.
Two mechanical points save most disputes. The QR code is one-time: deleting the eSIM profile and scanning again is not a supported route, so do not delete a profile while troubleshooting. And installing the profile is not the same as activating it, so an eSIM installed at home and never switched on has usually not consumed its validity — check the provider’s activation policy before assuming a plan is spent.
10. Is a Japan eSIM cheaper than pocket WiFi or roaming?
For most trips, yes — often by a wide margin.
| Option | Cost for 7 days, one traveller | Notes |
|---|---|---|
| Japan eSIM (10GB) | about $18 | One device, no pickup, no return |
| Pocket WiFi | about $33–67 | Shares with 5–15 devices; must be carried, charged and returned |
| Carrier roaming (US) | $70–84 per line | AT&T Day Pass about $12/day; Verizon about $10–12/day |
| Pocket WiFi per person (family of 4) | about $8–17 | Rental split four ways |
Pocket WiFi: the rental price is not the whole price
The pattern is consistent: eSIM is cheapest for solo travellers, pocket WiFi becomes competitive once you are splitting one device across three or more people, and carrier roaming is the most expensive option in nearly every scenario. We compare the three side by side, including the group and long-stay maths, in our Japan eSIM vs pocket WiFi vs SIM card guide.
11. How Japan eSIM Prices Moved Through 2026
Prices in this market move in steps rather than curves, and the step that mattered in 2026 was on the unlimited side.
Unlimited got more expensive
The most visible change of the year was Airalo repricing its Japan unlimited tiers upward in early 2026. The effect was to close most of the gap between unlimited plans and fixed bundles, and to flip the value argument: a fixed 20–50 GB bundle now buys more usable high-speed data per dollar than a comparable run of unlimited days for anybody who is not genuinely streaming all day.
Why some prices are quoted in yen and others in dollars
Sellers based in Japan — Mobal, Sakura Mobile, b-mobile, IIJmio — quote in yen, and Japanese consumer prices are displayed inclusive of consumption tax, so the number you see is the number you pay. Overseas sellers quote in US dollars and no Japanese consumption tax applies to a plan you buy from abroad, which is one structural reason an international eSIM can undercut a domestic counter product at the same data volume. The trade-off is currency: a yen-priced plan moves with the exchange rate between booking and billing, and a dollar-priced plan does not.
Promotions are a permanent feature
Both of the large marketplaces run introductory offers, seasonal sales and occasional doubled-data promotions, and Japan-focused sellers periodically discount by a fifth. None of it is worth building a plan around, because the promotions rotate, but it does mean list price is the wrong number to compare at the checkout stage.
12. Japan eSIM Price FAQ: Cost per GB and per Day
How much does a Japan eSIM cost? Around $4 for an entry 1GB plan, $15–25 for a typical 7–14 day bundle, and $26–74 for unlimited plans depending on duration. Per-GB rates fall to roughly $0.7–1.25 on larger bundles.
What is the cheapest Japan eSIM? On entry pricing, Ubigi’s small daily plan and Airalo’s 1GB tier are among the lowest, at around $3–4. Ubigi and Nomad tend to lead on larger bundles, with 10GB for about $16–17.
Is unlimited worth it in Japan? Only above roughly 1.5–2GB per day. Below that, a fixed bundle is cheaper. Above it, unlimited removes the risk of running out and is often priced similarly to stacked top-ups.
Are Japan eSIM prices going up? They move with promotions rather than a single trend. Airalo’s Japan unlimited tiers were repriced upward in early 2026, which closed much of the gap with Holafly and made fixed data relatively more attractive.
Can I get a refund if I buy the wrong plan? Usually only before the QR code is scanned. Read the specific policy on the provider’s checkout page before paying.
Where these prices come from.
Do I pay Japanese tax on a Japan eSIM? Not usually. Plans sold by overseas providers are priced in US dollars with no Japanese consumption tax attached, while Japanese providers quote yen prices inclusive of tax because that is how consumer prices are displayed in the country.
Does a Japan eSIM expire if I never use it? It depends on the provider. An Ubigi Japan plan that is never activated lapses six months after purchase, while some other providers do not state a shelf life on the Japan plan page at all. If your trip is more than a few months away, check before you buy early.
Should I buy one large plan or two smaller ones? One larger plan, almost always. The per-gigabyte rate improves by four to five times between the smallest and largest tiers, and a top-up bought mid-trip can cost more per gigabyte than the bundle you started with.
When should I install my Japan eSIM so I do not lose days? Install it at home on Wi-Fi, then leave the line switched off until you land. That works whether your provider counts validity from installation or from first connection in Japan, and it avoids the airport Wi-Fi scramble.
Are Japan eSIM prices higher in 2026 than in 2025? Unlimited plans are, after the early-2026 repricing. Fixed-data bundles have stayed close to flat, so the practical answer is that the gap between the two plan shapes has narrowed from both directions. The tables above are a September 2026 snapshot. Prices move, so check the provider’s own pages and the official sources below before you buy:
- Holafly Japan eSIM - official unlimited pricing and current promotions.
- Japan Wireless - official pocket WiFi and eSIM rates.
- Mobal - official voice and data pricing for visitors.
- Ookla’s Speedtest Global Index for Japan - independent measurement of the speeds you are paying for.
- Japan’s Ministry of Internal Affairs and Communications - official data on Japan’s mobile market.
Final verdict: what a Japan eSIM really costs
For the majority of travellers, the cheapest sensible answer is a 10–20GB fixed plan over 30 days for about $16–25 — enough headroom for maps, messaging, translation and light video, with no throttling. Buy unlimited only if you know you will pass 2GB a day, and skip roaming unless your employer is paying. If you want the same numbers applied to a specific itinerary length, see our Japan eSIM data-volume guide for the data-volume side of the decision, and the if you also need calls and SMS guide if calls and SMS are also on your list.
