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
16 Sep - 30 Sep	Finnair
16 Sep - 23 Sep	Finnair
16 Sep - 25 Sep	Finnair
23 Sep - 30 Sep	Finnair
15 Sep - 25 Sep	Finnair
14 Sep - 30 Sep	Finnair
08 Sep - 19 Sep	Norwegian
11 Sep - 24 Sep	Norwegian Air Sweden AOC
05 Sep - 12 Sep	Pegasus Airlines
24 Sep - 01 Oct	Finnair
23 Sep - 09 Oct	Austrian Airlines
22 Sep - 22 Oct	Austrian Airlines
23 Sep - 21 Oct	Austrian Airlines
08 Sep - 06 Oct	Austrian Airlines
10 Sep - 02 Oct	KLM
09 Sep - 05 Oct	KLM
15 Sep - 15 Oct	SWISS
10 Sep - 01 Oct	Air France
04 Sep - 26 Oct	KLM

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.

Book a cheap hotel in Bangkok

Cheap car rent in Bangkok

Cheapest return flights from Oslo to Bangkok in September from 483€

Return flights