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

Return flights

15 Sep - 29 Oct	Vueling Airlines
15 Sep - 28 Sep	Wizz Air Malta
19 Sep - 24 Sep	transavia
13 Sep - 20 Sep	Wizz Air Malta
21 Sep - 30 Sep	Vueling Airlines
17 Sep - 24 Sep	Vueling Airlines
19 Sep - 22 Sep	Wizz Air Malta
24 Sep - 15 Oct	easyJet
23 Sep - 07 Oct	Vueling Airlines
23 Sep - 21 Oct	Vueling Airlines
20 Sep - 30 Sep	Wizz Air Malta
29 Sep - 06 Oct	Lufthansa
29 Sep - 09 Oct	Lufthansa
29 Sep - 14 Oct	Lufthansa
29 Sep - 05 Oct	Lufthansa
29 Sep - 13 Oct	Lufthansa
29 Sep - 15 Oct	Lufthansa
15 Sep - 30 Sep	Vueling Airlines
20 Sep - 27 Sep	Wizz Air Malta
15 Sep - 24 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 447€

Return flights