AirHint found the following cheapest one-way flights from Bangkok (DMK) to Helsinki (HEL) in September 2025 (see full year).

One-Way flights

22 Sep	Thai Lion Air
10 Sep	Thai Lion Air
25 Sep	Thai AirAsia
30 Sep	Thai Lion Air
16 Sep	Thai Lion Air
26 Sep	Thai Lion Air
17 Sep	Thai AirAsia
07 Sep	Thai Lion Air
01 Sep	Thai Lion Air
04 Sep	Thai AirAsia

Also check the deals for return 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 one-way flights from Bangkok to Helsinki in September from 381€

One-Way flights