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

Return flights

27 Sep - 13 Oct	Hainan Airlines
25 Sep - 10 Oct	Hainan Airlines
23 Sep - 13 Oct	Hainan Airlines
17 Sep - 30 Sep	Qatar Airways
18 Sep - 10 Oct	Hainan Airlines
27 Sep - 10 Oct	Hainan Airlines
29 Sep - 10 Oct	Pegasus Airlines
19 Sep - 10 Oct	Pegasus Airlines
27 Sep - 14 Oct	Hainan Airlines
21 Sep - 29 Sep	Ryanair
16 Sep - 23 Sep	Qatar Airways
15 Sep - 22 Sep	Qatar Airways
16 Sep - 29 Sep	Qatar Airways
21 Sep - 27 Sep	KLM
21 Sep - 28 Sep	KLM
21 Sep - 07 Oct	KLM
23 Sep - 30 Sep	Air France
18 Sep - 25 Sep	KLM
18 Sep - 25 Sep	Thai Airways	direct
27 Sep - 12 Oct	Hainan 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.

Book a cheap hotel in Bangkok

Cheap car rent in Bangkok

Cheapest return flights from Oslo to Bangkok in September from 474€

Return flights