AirHint found the following cheapest return flights from Oslo (OSL) to Bangkok (BKK) in September 2025 (see full year).

Return flights

10 Sep - 24 Sep	Finnair
01 Sep - 15 Sep	Norwegian
17 Sep - 30 Sep	Finnair
09 Sep - 24 Sep	Finnair
09 Sep - 25 Sep	Finnair
09 Sep - 20 Sep	Finnair
12 Sep - 21 Sep	Finnair
23 Sep - 30 Sep	Finnair
03 Sep - 17 Sep	Finnair
10 Sep - 25 Sep	Finnair
23 Sep - 14 Oct	Finnair
04 Sep - 01 Oct	Lufthansa
11 Sep - 11 Oct	SWISS
24 Sep - 24 Oct	SWISS
01 Sep - 08 Oct	Lufthansa
30 Sep - 15 Oct	SWISS
23 Sep - 03 Oct	Finnair
10 Sep - 05 Oct	Finnair
20 Sep - 04 Oct	Finnair
24 Sep - 05 Oct	Finnair

Also check the deals for one-way flights from Oslo to Bangkok 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 Oslo to Bangkok in September from $552

Return flights