AirHint found the following cheapest return flights from Helsinki (HEL) to Bangkok (BKK) in September 2026 (see full year).

Return flights

07 Sep - 21 Sep	Turkish Airlines
09 Sep - 21 Sep	Turkish Airlines
01 Sep - 28 Sep	Turkish Airlines
18 Sep - 30 Sep	Turkish Airlines
05 Sep - 19 Sep	Turkish Airlines
01 Sep - 28 Sep	Finnair	direct
05 Sep - 19 Sep	Finnair	direct
07 Sep - 21 Sep	Finnair	direct
09 Sep - 21 Sep	Finnair	direct
18 Sep - 30 Sep	Finnair	direct

Also check the deals for one-way flights from Helsinki 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 Helsinki to Bangkok in September from 589€

Return flights