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

Return flights

25 Dec - 11 Jan	Norse Atlantic Airways (UK)
01 Dec - 08 Dec	Air China
22 Dec - 01 Jan	Thai VietJet Air
18 Dec - 05 Jan	Air India
09 Dec - 23 Dec	Air China
22 Dec - 08 Jan	Etihad Airways
20 Dec - 06 Jan	China Eastern
23 Dec - 06 Jan	Etihad Airways
19 Dec - 01 Jan	Thai VietJet Air
24 Dec - 31 Dec	Air China
24 Dec - 29 Dec	Air China
27 Dec - 03 Jan	Etihad Airways
26 Dec - 03 Jan	Etihad Airways
23 Dec - 03 Jan	Etihad Airways
04 Dec - 11 Dec	Air Europa

Also check the deals for one-way flights from Bangkok to Barcelona in December.

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 December from $688

Return flights