AirHint found the following cheapest return flights from Tokyo (TYO) to Bandar Seri Begawan (BWN) in September 2025 (see full year).

Return flights

10 Sep - 24 Sep	AirAsia X
15 Sep - 24 Sep	AirAsia X
10 Sep - 19 Sep	AirAsia X
15 Sep - 19 Sep	AirAsia X
10 Sep - 01 Oct	AirAsia X
15 Sep - 01 Oct	AirAsia X
14 Sep - 21 Sep	Singapore Airlines
14 Sep - 17 Sep	Singapore Airlines
15 Sep - 18 Sep	Singapore Airlines
19 Sep - 23 Sep	Singapore Airlines
24 Sep - 28 Sep	Singapore Airlines
20 Sep - 23 Sep	Singapore Airlines
21 Sep - 01 Oct	AirAsia X
20 Sep - 01 Oct	AirAsia X
19 Sep - 01 Oct	AirAsia X
18 Sep - 01 Oct	AirAsia X

Also check the deals for one-way flights from Tokyo to Bandar Seri Begawan in September.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Tokyo to Bandar Seri Begawan in September from $511

Return flights