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

Return flights

30 Sep - 11 Oct	IndiGo
28 Sep - 11 Oct	IndiGo
22 Sep - 30 Sep	Thai AirAsia
25 Sep - 30 Sep	IndiGo
27 Sep - 09 Oct	Thai VietJet Air
18 Sep - 12 Oct	Thai VietJet Air
27 Sep - 10 Oct	Thai VietJet Air
23 Sep - 26 Sep	Thai VietJet Air
30 Sep - 10 Oct	IndiGo
21 Sep - 01 Oct	Thai AirAsia
22 Sep - 29 Sep	Qatar Airways
23 Sep - 29 Sep	Qatar Airways
29 Sep - 01 Oct	Qatar Airways
21 Sep - 24 Sep	Qatar Airways
20 Sep - 24 Sep	Qatar Airways
30 Sep - 05 Oct	Qatar Airways
20 Sep - 29 Sep	Emirates
30 Sep - 09 Oct	Emirates
19 Sep - 19 Sep	Emirates
18 Sep - 25 Sep	Thai Airways	direct

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 $634

Return flights