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

Return flights

15 Dec - 02 Jan	easyJet	direct
15 Dec - 05 Jan	easyJet	direct
15 Dec - 16 Dec	easyJet
23 Dec - 12 Jan	Vueling Airlines
15 Dec - 17 Dec	easyJet
13 Dec - 16 Dec	Wizz Air
30 Dec - 06 Jan	Air Europa
11 Dec - 15 Dec	Vueling Airlines
31 Dec - 04 Jan	Iberia
09 Dec - 15 Dec	Wizz Air
12 Dec - 14 Dec	Vueling Airlines
12 Dec - 15 Dec	Wizz Air
09 Dec - 14 Dec	Wizz Air
12 Dec - 16 Dec	Wizz Air
13 Dec - 15 Dec	Wizz Air
30 Dec - 01 Jan	Air Europa
25 Dec - 01 Jan	Vueling Airlines
23 Dec - 08 Jan	Vueling Airlines
19 Dec - 02 Jan	easyJet	direct
22 Dec - 02 Jan	easyJet	direct

Also check the deals for one-way flights from Bilbao to Basel 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 Basel in December from 91€

Return flights