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

Return flights

25 Sep - 25 Oct	Etihad Airways
22 Sep - 29 Sep	Air Arabia
24 Sep - 03 Oct	Etihad Airways
19 Sep - 11 Oct	Etihad Airways
25 Sep - 29 Sep	Turkish Airlines
26 Sep - 29 Sep	Turkish Airlines
27 Sep - 23 Oct	Air France
19 Sep - 26 Sep	Qatar Airways
28 Sep - 05 Oct	Turkish Airlines
20 Sep - 27 Sep	Qatar Airways
25 Sep - 29 Sep	Finnair	direct
26 Sep - 29 Sep	Finnair	direct
28 Sep - 04 Oct	Turkish Airlines
24 Sep - 03 Oct	Finnair	direct
28 Sep - 05 Oct	Finnair	direct
22 Sep - 29 Sep	Finnair	direct
19 Sep - 26 Sep	Finnair	direct
20 Sep - 27 Sep	Finnair	direct
28 Sep - 04 Oct	Finnair	direct
18 Sep - 12 Oct	Lufthansa

Also check the deals for one-way flights from Bangkok to Helsinki 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 Helsinki in September from 641€

Return flights