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

Return flights

05 Sep - 12 Sep	Finnair
03 Sep - 17 Sep	Finnair
21 Sep - 28 Sep	Finnair
19 Sep - 30 Sep	Finnair
01 Sep - 15 Sep	Finnair
18 Sep - 05 Oct	Finnair
13 Sep - 27 Sep	Finnair
02 Sep - 16 Sep	Ryanair
04 Sep - 15 Sep	Finnair
15 Sep - 21 Sep	KLM
25 Sep - 02 Oct	Air France
28 Sep - 12 Oct	KLM
12 Sep - 27 Sep	Air France
27 Sep - 11 Oct	SWISS

Also check the deals for one-way flights from Riga 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 Riga to Bangkok in September from $621

Return flights