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

Return flights

10 Sep - 18 Sep	Hainan Airlines
12 Sep - 23 Sep	Hainan Airlines
10 Sep - 23 Sep	Hainan Airlines
19 Sep - 28 Sep	Hainan Airlines
29 Sep - 06 Oct	Thai AirAsia
05 Sep - 12 Sep	Hainan Airlines
12 Sep - 19 Sep	Hainan Airlines
20 Sep - 05 Oct	IndiGo
09 Sep - 18 Sep	IndiGo
08 Sep - 14 Sep	IndiGo
15 Sep - 21 Sep	IndiGo
15 Sep - 16 Sep	IndiGo
08 Sep - 09 Oct	Hainan Airlines
28 Sep - 08 Oct	IndiGo
27 Sep - 10 Oct	IndiGo
27 Sep - 09 Oct	IndiGo
30 Sep - 07 Oct	IndiGo
15 Sep - 13 Oct	IndiGo
24 Sep - 11 Oct	Hainan Airlines
26 Sep - 07 Oct	IndiGo

Also check the deals for one-way flights from Bangkok to Oslo 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 Bangkok to Oslo in September from 485€

Return flights