A Japan eSIM costs between roughly $0.65 and $4.31 per GB in 2026, depending on the provider and plan size. Fixed-data plans price by the gigabyte (JW eSIM’s 50GB/30-day plan works out to about $1.16/GB), while unlimited plans price by the day and only make sense for heavy users who would otherwise buy 20GB or more.
Below is how the major Japan eSIM sellers price out on a per-GB basis, using verified July 2026 prices before any promotional discount.
Japan eSIM per-GB price comparison (July 2026)
| Provider | Plan | Price per GB |
|---|---|---|
| JW eSIM (4G Fixed) | 50GB / 30 days — $58.14 | $1.16/GB |
| JW eSIM (5G Fixed) | 30GB / 10 days — $33.64 | $1.12/GB |
| JW eSIM (5G Fixed) | 12GB / 4 days — $16.30 | $1.36/GB |
| Saily | 20GB / 30 days — $24.99 | $1.25/GB |
| Ubigi | 10GB — ¥2,400 (~$16) | ~$1.60/GB |
| IIJmio | 55GB — ¥5,780 (~$35.57) | ~$0.65/GB |
| Airalo | 1GB — ¥700 (~$4.31) | ~$4.31/GB |
| Holafly | Unlimited only (no per-GB pricing) | N/A |
On paper, IIJmio’s 55GB bucket is the cheapest per gigabyte, but it uses the docomo MVNO network and is aimed at longer stays. For short trips with heavier daily use, JW eSIM’s 5G Fixed 30GB/10-day plan at $1.12/GB on the KDDI network is the lowest per-GB rate among the tourist-focused sellers.
Unlimited plans: cost per day, not per GB
Unlimited eSIMs don’t have a per-GB price — you’re paying for time. The relevant number is cost per day:
- JW eSIM 5G Unlimited (KDDI): 7-day $28.28 ($4.04day), 14-day $52.41 ($3.5/day), 30-day $66.55 ($2.22/day)
- Holafly Unlimited: 7-day $27.50 ($3.93/day), 15-day $50.50 ($3.37/day), 30-day $73.90 ($2.46/day)
- Saily Unlimited: 30 days $71.99 ($2.40/day)
Holafly’s 15-day unlimited is $50.50 versus JW eSIM’s 15-day at $52.41, but Holafly caps hotspot sharing at 1GB per day. JW eSIM’s 5G Unlimited allows higher hotspot use that scales with plan length.
When per-GB pricing makes sense
Fixed-data plans are cheaper per GB, but you have to estimate your usage. As a rough guide for a 7-day Japan trip using Google Maps, LINE, and light social media, most travelers use 3–8GB. Heavy video streaming or hotspot use pushes that past 20GB, at which point an unlimited plan becomes better value.
JW eSIM cost-savers worth knowing: 20% off is auto-applied at checkout on qualifying plans in July 2026.
What you’re actually paying for (not just gigabytes)
Per-GB price ignores three things that affect total value:
- Network. JW eSIM’s 5G Unlimited runs on KDDI; the 4G LTE Unlimited runs on IIJmio (a docomo-network MVNO). Ubigi is docomo. Holafly uses KDDI and SoftBank.
- Hotspot rules. Holafly caps tethering at 1GB/day. JW eSIM 5G Unlimited supports hotspot with a high-speed allowance that scales with plan duration.
- Backup if it fails. JW eSIM provides a free Pocket WiFi if the eSIM cannot connect after guided troubleshooting — no other Japan eSIM seller offers a physical fallback. Holafly, in contrast, offers refunds (including for incompatible devices, QR code has not been scanned) up to 6 months; JW eSIM lists its plans as non-refundable.
Frequently Asked Questions
What is the cheapest Japan eSIM per GB in 2026?
Among tourist-focused sellers, JW eSIM’s 5G Fixed 30GB/10-day plan at $33.64 works out to $1.12/GB, the lowest among short-trip options. IIJmio’s 15GB domestic plan is cheaper per GB (~$0.65) but targets long-term residents on the docomo MVNO network, not short-stay tourists.
How many GB do I need for a 7-day Japan trip?
Most travelers use 3–8GB over 7 days with Google Maps, LINE, and social media. JW eSIM’s 5G Fixed 21GB/7-day plan at $27.16 covers heavier use including video. If you plan to hotspot a laptop or stream regularly, choose the 7-day 5G Unlimited at $28.28 instead.
Is unlimited or per-GB better for Japan?
Per-GB is cheaper if you’ll use under 15GB. Unlimited wins for heavy streaming, hotspot use, or trips longer than 10 days. JW eSIM’s 30-day 5G Unlimited at $83.19 ($66.55 after 20% discount) works out to about $2.77/day, versus $8.32/day on the 2-day plan — longer unlimited plans have a much lower daily rate.
Does JW eSIM charge extra for hotspot use?
No extra charge. Hotspot and tethering are included on the 5G Unlimited plan with a high-speed allowance that scales with plan duration; after the allowance, hotspot continues at a reduced speed. Holafly, by comparison, caps tethering at 1GB per day on its unlimited Japan eSIM.
Are there discounts on JW eSIM in 2026?
Yes. A 20% discount is auto-applied at checkout. Always confirm the final price at checkout, as promotions may subject to change.
Can I get a refund if the eSIM doesn’t work?
JW eSIM plans are listed as non-refundable, but JW provides a free Pocket WiFi as a physical backup if the eSIM cannot connect after guided troubleshooting — a fallback no other Japan eSIM seller offers. Holafly does offer refunds up to 6 months (if you have not scanned eSIM QR code), including for incompatible devices.
Which network does JW eSIM use?
JW eSIM’s 5G Unlimited runs on KDDI (au), and the 4G LTE Unlimited runs on IIJmio, a docomo-network MVNO. Both cover major cities and most rural areas. Holafly runs on KDDI and SoftBank; Ubigi and IIJmio run on the docomo network.
