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

Return flights

23 Sep - 28 Oct	Ryanair
25 Sep - 28 Oct	Wizz Air Malta
24 Sep - 28 Oct	Ryanair
23 Sep - 19 Oct	Ryanair
30 Sep - 12 Oct	Ryanair
23 Sep - 07 Oct	Ryanair
23 Sep - 30 Sep	Wizz Air Malta
23 Sep - 09 Oct	Ryanair
26 Sep - 09 Oct	Ryanair
24 Sep - 01 Oct	Air China
27 Sep - 19 Oct	Vueling Airlines
25 Sep - 30 Sep	Vueling Airlines
27 Sep - 30 Sep	Vueling Airlines
24 Sep - 30 Sep	Ryanair
22 Sep - 28 Sep	Ryanair
26 Sep - 29 Sep	Ryanair
24 Sep - 29 Sep	Ryanair
23 Sep - 28 Sep	Ryanair
24 Sep - 27 Sep	Ryanair
20 Sep - 27 Sep	Vueling Airlines

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 $529

Return flights