Rules of Fares on Japan Domestic Flights
This page provides information about the applicable fare calculation rules and fare basis dates for flights boarding on or after May 19, 2026.
Fare Basis Dates
The applicable fare basis changes depending on factors such as the date of purchase or the date a change was made.
Specific Examples
Here are some specific examples to demonstrate the fare calculation rules and fare basis dates.
At time of purchase
On the purchase date, the fare valid on the start date of your trip will be applied.
A FLEX round trip is purchased on 4/5, with an outbound route (4/10 ANA51 Haneda to Chitose) and an inbound route (4/30 ANA58 Chitose to Haneda).
Even if there is a subsequent price increase for the fare amounts for flights boarding in April made on 4/12, the inbound fare amount will not be changed, as both the outbound and inbound fare amounts valid for the start date of the trip (4/10) on the purchase date (4/5) will be applied.
At the Time of Change (Before Beginning Your Trip)
On the change date, the fare valid on the start date of the trip will be applied to the entire itinerary.
A FLEX round trip is purchased on 5/25, with an outbound flight (7/1, ANA253, Haneda to Fukuoka) and an inbound flight (10/3, ANA258. Fukuoka to Haneda).
If changes are made to the reserved flights for the outbound flight (7/3, ANA253, Haneda to Fukuoka) and inbound flight (10/4, ANA258, Fukuoka to Haneda) parts on 7/1, the fare amounts valid for the start date of the trip on the day that the changes are made (= 7/1) will be applied for both flights.
At the Time of Change (After Beginning Your Trip)
On the purchase date, the fare amount valid on the start date of the trip will be applied to the segment that is being changed.
A FLEX round trip is purchased on 5/25, with an outbound flight (7/1, ANA253, Haneda to Fukuoka) and an inbound flight (10/3, ANA258, Fukuoka to Haneda).
After boarding the outbound flight on 7/1, if changes are made to the reserved flight for the inbound flight (10/4, ANA258, Fukuoka to Haneda) on 7/3, the fare amount that is valid for the start date of the trip (7/1) on the purchase date (5/25) will be applied to the inbound flight.
