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

Return flights

17 Sep - 24 Sep	Finnair
10 Sep - 17 Sep	Finnair
24 Sep - 30 Sep	Finnair
08 Sep - 23 Sep	Finnair
10 Sep - 22 Sep	Finnair
05 Sep - 28 Sep	Finnair
08 Sep - 24 Sep	Finnair
02 Sep - 21 Sep	Finnair
22 Sep - 30 Sep	Finnair
04 Sep - 20 Sep	Finnair
15 Sep - 30 Oct	Pegasus Airlines
23 Sep - 07 Oct	Austrian Airlines
17 Sep - 01 Oct	Finnair
23 Sep - 02 Oct	Finnair
02 Sep - 08 Oct	Emirates
25 Sep - 06 Oct	Finnair
04 Sep - 05 Oct	Finnair
13 Sep - 03 Oct	KLM
27 Sep - 14 Oct	Finnair
27 Sep - 09 Oct	Austrian Airlines

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 $553

Return flights