Japan eSIM: why the 7-day unlimited plan costs more per day than the 5-day

This post contains affiliate links; we earn a commission if you book through them.

Prices as of , read from Airalo's public Japan eSIM page in USD. Prices may change; check the current price on the booking page before you pay.

Why does the 7-day unlimited plan cost more per day than the 5-day one?

Longer plans are usually cheaper per day. On Airalo's Japan unlimited list that was not true at every step in this observation.

Unlimited planPricePer day
3 days$11.50$3.83
5 days$17.00$3.40
7 days$26.50$3.79
10 days$34.50$3.45
15 days$48.00$3.20
30 days$69.00$2.30

Unlimited fair-use condition: Lower speed rate of 1 Mbps after 3 GB usage per day. This condition was listed for every unlimited plan above; unlimited does not mean unlimited full-speed data.

  • 7 days at $26.50 works out to about $3.79 a day, more than 5 days at $17.00 (about $3.40 a day).
  • Two 5-day plans add up to $34.00, compared with $34.50 for one 10-day plan. The combined price is lower in this observation. Whether two plans can be used back to back on one phone is set by the seller, so check the top-up terms first.

Fixed-data plans: compare validity and the price per gigabyte

DataValid forPricePer GB
1 GB3 days$4.00$4.00
3 GB3 days$7.50$2.50
3 GB7 days$8.00$2.67
5 GB7 days$10.00$2.00
5 GB15 days$10.50$2.10
5 GB30 days$11.00$2.20
10 GB7 days$17.00$1.70
10 GB15 days$17.50$1.75
10 GB30 days$18.00$1.80
20 GB15 days$24.00$1.20
20 GB30 days$25.00$1.25
  • 5 GB for 15 days was $10.50, only $0.50 more than 5 GB for 7 days ($10.00).
  • 3 GB for 7 days was $8.00, $0.50 more than 3 GB for 3 days.
  • 20 GB for 15 days ($24.00) and for 30 days ($25.00) differ by $1.00.

How to pick

  1. Choose a validity that covers your trip, then estimate the data you will use. In this fixed-plan list, validity changes the price less than the data allowance does.
  2. If you want unlimited, compare the per-day figure for your exact trip length instead of assuming longer is cheaper.
  3. Check phone compatibility, the network, and the refund terms on the booking page.

Current plans are on the booking page: Airalo Japan eSIM (affiliate link). This post contains affiliate links; we earn a commission if you book through them.

Sources checked

Calculated from listed prices; we have not used these plans and cannot promise speed or coverage. Prepared with AI assistance.

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