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

Return flights

09 Sep - 07 Oct	Finnair
09 Sep - 28 Sep	Finnair
17 Sep - 27 Sep	Finnair
10 Sep - 24 Sep	Finnair
12 Sep - 30 Sep	Finnair
09 Sep - 23 Sep	Finnair
16 Sep - 23 Sep	Finnair
12 Sep - 25 Sep	Finnair
03 Sep - 18 Sep	Finnair
02 Sep - 11 Sep	Finnair
12 Sep - 19 Sep	Finnair
29 Sep - 31 Oct	Lufthansa
19 Sep - 17 Oct	Finnair
22 Sep - 06 Oct	Finnair
30 Sep - 31 Oct	Lufthansa
28 Sep - 08 Oct	Lufthansa
02 Sep - 08 Oct	Lufthansa
01 Sep - 31 Oct	Lufthansa
23 Sep - 17 Oct	Qatar Airways
25 Sep - 26 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 474€

Return flights