Validity of Mileage is 36 months.

Validity of mileage is the last day of the 36th month following the month of the flight (transaction) date.* You can easily check the validity of mileage online. Please enjoy a full 36 months to redeem mileage.

For example: Any mileage earned on JAL Group flight in August 1, will remain valid until August 31, 3 years later.
Mileage expiration time will be 00:00 Japan Time on the first day of every month.
[For members in regions outside of Japan]
American Region: Miles expire at 7:00 US Pacific Time on the day before the expiration date.
Europe/Middle East/Africa Region: Miles expire at 15:00 England Time on the day before the expiration date.
Asia/Oceania Region: Miles expire at 23:00 Hong Kong Time on the day before the expiration date.