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

Return flights

29 Sep - 10 Oct	Thai VietJet Air
28 Sep - 07 Oct	Air India
16 Sep - 24 Sep	Kuwait Airways
22 Sep - 09 Oct	Gulf Air
28 Sep - 05 Oct	Kuwait Airways
29 Sep - 08 Oct	Gulf Air
27 Sep - 06 Oct	Air India
15 Sep - 21 Sep	Air India
17 Sep - 30 Sep	Iberia
04 Sep - 17 Sep	Etihad Airways
18 Sep - 26 Sep	Iberia
08 Sep - 15 Sep	Iberia
11 Sep - 19 Sep	Iberia
08 Sep - 22 Sep	Hainan Airlines
09 Sep - 16 Sep	KLM
10 Sep - 17 Sep	KLM
27 Sep - 09 Oct	Air India
24 Sep - 07 Oct	Iberia
28 Sep - 03 Oct	Iberia
26 Sep - 04 Oct	Emirates

Also check the deals for one-way flights from Bangkok to Barcelona 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 Bangkok to Barcelona in September from $667

Return flights