AirHint found the following cheapest return flights from Barcelona (BCN) to Bangkok (BKK) in September 2026 (see full year).

Return flights

20 Sep - 04 Oct	Cathay Pacific
24 Sep - 10 Oct	Cathay Pacific
10 Sep - 11 Oct	Cathay Pacific
17 Sep - 04 Oct	Cathay Pacific
06 Sep - 30 Sep	SWISS
10 Sep - 30 Sep	SWISS
10 Sep - 29 Sep	SWISS
08 Sep - 06 Oct	SWISS
17 Sep - 30 Sep	SWISS
14 Sep - 29 Sep	Austrian Airlines
07 Sep - 30 Sep	Austrian Airlines
14 Sep - 30 Sep	Austrian Airlines
15 Sep - 29 Sep	SWISS
15 Sep - 30 Sep	SWISS
21 Sep - 15 Oct	SWISS
23 Sep - 05 Oct	SWISS
22 Sep - 22 Oct	SWISS
28 Sep - 11 Oct	British Airways
15 Sep - 28 Sep	Wizz Air Malta
22 Sep - 09 Oct	SWISS

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 $594

Return flights