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

Return flights

29 Sep - 29 Oct	Pegasus Airlines
12 Sep - 27 Sep	Pegasus Airlines
24 Sep - 08 Oct	AJet
17 Sep - 28 Sep	Pegasus Airlines
12 Sep - 21 Sep	Pegasus Airlines
06 Sep - 28 Sep	Pegasus Airlines
18 Sep - 01 Oct	Pegasus Airlines
06 Sep - 20 Sep	AJet
12 Sep - 25 Sep	AJet
08 Sep - 21 Sep	Pegasus Airlines
12 Sep - 22 Sep	Pegasus Airlines
12 Sep - 01 Oct	Pegasus Airlines
17 Sep - 29 Sep	Pegasus Airlines
17 Sep - 24 Sep	Pegasus Airlines
19 Sep - 01 Oct	AJet
07 Sep - 01 Oct	AJet
24 Sep - 06 Oct	AJet
01 Sep - 01 Oct	Pegasus Airlines
19 Sep - 03 Oct	AJet
19 Sep - 02 Oct	AJet

Also check the deals for one-way flights from Basel 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 Basel to Bangkok in September from $549

Return flights