Airalo vs Ubigi for Japan: Prices, Data Caps & Hotspot (2026)

For the same 10GB allowance and validity, Ubigi’s listed price was lower in our check: US$14 versus Airalo’s US$17 for seven days, or US$16.50 versus US$18 for thirty days. Both providers also sell unlimited plans. For those, compare when the high-speed allowance resets, not just the word unlimited.

We checked official prices in US dollars on September 26, 2026, without coupons or currency conversion. This compares published plans, not independently measured speeds. Final checkout terms take priority. Airalo and Ubigi purchase links in “Check the current offers” are affiliate links; we may earn a commission at no extra cost to you.

Compare the same capacity, duration and currency

Fixed-data package	Airalo	Ubigi
10GB, 7 days	US$17	US$14
10GB, 30 days	US$18	US$16.50

Sources: Airalo Japan’s Fixed data tab, Ubigi 10GB / 7 days and 10GB / 30 days.

The difference in these examples is US$3 for seven days or US$1.50 for thirty days. Neither establishes a speed winner. An app you already understand, supported networks at your stops, and your actual data needs can matter more than that difference.

For a fourteen-day trip needing about 10GB, the thirty-day package can be a useful option even though its validity is longer than your stay. You do not need to use every day of validity. Conversely, a cheap seven-day plan stops covering the trip halfway through unless you arrange another plan.

These are two matched examples, not either provider’s full catalog. Estimate your usage first. Buying 10GB solely because it appears in a comparison is poor value if you only need a small fraction of it—or if your laptop will consume it immediately.

Unlimited: the reset rule changes the comparison

The longer unlimited packages have matching durations, but their high-speed limits work differently:

Unlimited package	Airalo	Ubigi
15 days	US$48; standard policy is 3GB per 24 hours, then 1 Mbps	US$39; 30GB at high speed across the plan, then 2Mbps
30 days	US$69; standard policy is 3GB per 24 hours, then 1 Mbps	US$65; 60GB at high speed across the plan, then 2Mbps

Sources: Airalo Japan and its unlimited fair-use policy, Ubigi unlimited / 15 days and unlimited / 30 days. Airalo says package-specific thresholds override its standard policy; check the selected offer.

For a short trip, the current choices are Airalo seven days at US$26.50 and Ubigi eight days at US$25. These are different durations. Ubigi’s eight-day package has its own rule: 5GB per day, then 2Mbps, with a reset every 24 hours from initial activation. Do not apply the fifteen-day plan’s 30GB threshold to it.

Airalo’s standard daily window also runs from activation, not necessarily midnight in Japan. Daily and whole-plan limits suit different usage patterns: a large photo upload on one day may hit a daily limit even when the rest of the week is quiet; a whole-plan allowance lets that busy day consume more of the trip’s remaining balance. Do not assume unused daily capacity carries into the next window.

The advertised slower speed is a limit, not a performance guarantee. For essential work calls, plan around the high-speed allowance and keep another connection available.

Networks and hotspot

The Japan listings checked show SoftBank and KDDI for Airalo, and KDDI and NTT Docomo for Ubigi. A shared carrier name does not mean identical roaming arrangements or measured performance. Check coverage for your actual towns and accommodation, particularly on rural routes. We have not tested either service along your itinerary.

Airalo permits personal hotspot use under its unlimited policy; the cited Ubigi plans allow data sharing. Tethering still consumes the applicable allowance. Count laptop backups, software downloads and video alongside phone usage before choosing a capacity. A hotspot toggle is not an extra pool of data.

Which plan fits your trip?

Your situation	Useful starting point
Seven days and a known 10GB budget	Compare the matched seven-day fixed plans above
Two weeks and roughly 10GB total	Consider the thirty-day 10GB plans; their validity covers the whole trip
Regular daily use and a daily reset you understand	Compare Airalo unlimited and Ubigi’s eight-day plan, matching the required trip length
Fifteen or thirty days with uneven uploads	Compare a fixed allowance against Ubigi’s whole-plan unlimited threshold; check whether Airalo’s daily model fits better
Several countries	Check every destination in a regional plan; Japan-only data does not include onward stops
Japanese calls or SMS	Choose a separate voice-capable product; these Japan data plans do not add a phone number

As a budgeting exercise, 1GB per day for seven days is 7GB; 2GB per day is 14GB. These are arithmetic examples, not measurements of typical tourist use. Your phone’s recent data history is a better starting point than somebody else’s itinerary.

Installation and validity

Install over a reliable connection, following the exact package’s instructions. Installation and the start of paid validity can be different events. Ubigi’s cited plans use arrival-based Smartstart activation; Airalo’s Japan listing says the package starts on connecting to a supported network. Check activation and any installation deadline before setting up early.

After arrival, enable the travel line, select it for mobile data, and apply its roaming settings. Keep home-line data roaming off unless you deliberately intend to use that carrier’s roaming offer. Calls and texts on the home line can have separate charges.

Our Japan eSIM setup guide covers the data-line, roaming and connection checks. If a profile is already installed, troubleshoot before deleting it; reinstalling is not always possible.

Check the current offers

Use Airalo’s Japan plans or Ubigi seven-day 10GB and thirty-day 10GB pages. For unlimited, use the duration-specific sources above so you read the correct high-speed rules.

Before paying, match the full trip length, usable data, hotspot needs and final currency, and check cancellation and renewal terms. Our examples are one-off travel purchases; do not substitute a recurring subscription based only on its first month’s price.

Still comparing providers? Our four-provider Japan eSIM guide includes Klook and Sakura Mobile. If a Japanese number matters, read the Mobal, Airalo and Sakura comparison before buying a data-only plan.