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

Return flights

09 Sep - 23 Sep	Finnair
01 Sep - 10 Sep	Lufthansa
01 Sep - 15 Sep	Lufthansa
02 Sep - 15 Sep	Lufthansa
22 Sep - 20 Oct	Turkish Airlines
01 Sep - 14 Sep	Pegasus Airlines
01 Sep - 08 Sep	Turkish Airlines
01 Sep - 08 Sep	Finnair	direct
01 Sep - 14 Sep	Finnair	direct
01 Sep - 15 Sep	Finnair	direct
02 Sep - 15 Sep	Finnair	direct
22 Sep - 20 Oct	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 573€

Return flights