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

Return flights

19 Sep - 14 Oct	Pegasus Airlines
14 Sep - 29 Sep	Pegasus Airlines
03 Sep - 09 Sep	Pegasus Airlines
21 Sep - 05 Oct	Air France
21 Sep - 06 Oct	Air France
21 Sep - 07 Oct	Air France
05 Sep - 08 Sep	KLM
02 Sep - 09 Sep	Pegasus Airlines
05 Sep - 13 Sep	Pegasus Airlines
18 Sep - 13 Oct	Air France
20 Sep - 07 Oct	Air France
05 Sep - 16 Sep	Pegasus Airlines
06 Sep - 15 Sep	Austrian Airlines
03 Sep - 10 Sep	Turkish Airlines
04 Sep - 06 Sep	Turkish Airlines
11 Sep - 18 Sep	Turkish Airlines
25 Sep - 13 Oct	Air France
25 Sep - 14 Oct	SWISS
26 Sep - 17 Oct	Austrian Airlines

Also check the deals for one-way flights from Sofia 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 Sofia to Bangkok in September from 506€

Return flights