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

Return flights

26 Dec - 09 Jan	Vueling Airlines	direct
26 Dec - 02 Jan	Vueling Airlines	direct
30 Dec - 02 Jan	Air Europa
30 Dec - 06 Jan	Air Europa
26 Dec - 07 Jan	Vueling Airlines
31 Dec - 07 Jan	Iberia
31 Dec - 02 Jan	Iberia
30 Dec - 03 Jan	Air Europa
31 Dec - 05 Jan	Iberia
26 Dec - 05 Jan	Vueling Airlines	direct
30 Dec - 31 Dec	Air Europa
26 Dec - 29 Dec	Brussels Airlines	direct
27 Dec - 31 Dec	Air Europa
29 Dec - 31 Dec	Smart Wings
25 Dec - 31 Dec	Air Europa
28 Dec - 31 Dec	Volotea
26 Dec - 30 Dec	Vueling Airlines
28 Dec - 30 Dec	Volotea
27 Dec - 30 Dec	Air Europa
25 Dec - 26 Dec	Air Europa

Also check the deals for one-way flights from Bilbao to Brussels 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 Brussels in December from 136€

Return flights