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

Return flights

01 Dec - 15 Dec	SWISS
01 Dec - 27 Dec	SWISS
08 Dec - 21 Dec	Vueling Airlines
14 Dec - 01 Jan	Etihad Airways
12 Dec - 24 Dec	Wizz Air Malta
28 Dec - 16 Jan	Brussels Airlines
15 Dec - 29 Dec	Wizz Air Malta
06 Dec - 28 Dec	Turkish Airlines
16 Dec - 28 Dec	Lufthansa
10 Dec - 02 Jan	Etihad Airways
16 Dec - 31 Dec	Lufthansa
05 Dec - 28 Dec	Iberia
05 Dec - 27 Dec	Iberia
24 Dec - 10 Jan	Wizz Air Malta
26 Dec - 06 Jan	Vueling Airlines
13 Dec - 01 Jan	Volotea
24 Dec - 05 Jan	Vueling Airlines
16 Dec - 01 Jan	Iberia
24 Dec - 07 Jan	Wizz Air Malta
16 Dec - 02 Jan	Iberia

Also check the deals for one-way flights from Bilbao to Bangkok 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 Bilbao to Bangkok in December from $722

Return flights