What is "Satogaeri"? "Satogaeri" means special round trip fares to Japan. This airfare is seasonal and is divided into 3 seasons. The least expensive season starts in November and continues up to March, with an exception with the end of the year, and the most expensive season starts in June and ends in August. Within these basic 3 season prices, sales price is constantly changing year round. It could change every week depending on supply and demand.