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

Return flights

08 Sep - 26 Sep	Vueling Airlines
10 Sep - 22 Sep	SWISS
03 Sep - 10 Sep	Wizz Air Malta
03 Sep - 16 Sep	Wizz Air Malta
01 Sep - 16 Sep	Wizz Air Malta
29 Sep - 06 Oct	SWISS
29 Sep - 15 Oct	SWISS
30 Sep - 23 Oct	SWISS
24 Sep - 08 Oct	Kuwait Airways
28 Sep - 15 Oct	Kuwait Airways
09 Sep - 16 Sep	Wizz Air Malta
22 Sep - 22 Oct	Vueling Airlines
10 Sep - 30 Sep	Kuwait Airways
16 Sep - 23 Sep	Kuwait Airways
15 Sep - 29 Sep	Vueling Airlines
02 Sep - 16 Sep	Wizz Air Malta
29 Sep - 05 Oct	SWISS
23 Sep - 01 Oct	Wizz Air Malta
23 Sep - 03 Oct	Vueling Airlines
05 Sep - 05 Oct	Wizz Air Malta

Also check the deals for one-way flights from Barcelona 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 Barcelona to Bangkok in September from $473

Return flights