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

Return flights

29 Sep - 06 Oct	Air India
08 Sep - 15 Sep	Thai VietJet Air
21 Sep - 30 Sep	Kuwait Airways
27 Sep - 14 Oct	Austrian Airlines
07 Sep - 30 Oct	China Eastern
15 Sep - 22 Sep	KLM
28 Sep - 02 Oct	Air India
28 Sep - 05 Oct	Kuwait Airways
08 Sep - 23 Sep	KLM
05 Sep - 30 Sep	Hainan Airlines
02 Sep - 12 Sep	Hainan Airlines
27 Sep - 02 Oct	Air India
19 Sep - 30 Sep	Air India
14 Sep - 19 Sep	Hainan Airlines
12 Sep - 19 Sep	Hainan Airlines
07 Sep - 13 Sep	Hainan Airlines
28 Sep - 12 Oct	Kuwait Airways
27 Sep - 04 Oct	Air India
26 Sep - 07 Oct	Air India
26 Sep - 03 Oct	Etihad Airways

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.

Book a cheap hotel in Barcelona

Cheap car rent in Barcelona

Cheapest return flights from Bangkok to Barcelona in September from 534€

Return flights