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

Return flights

13 Dec - 21 Dec	Lufthansa
13 Dec - 21 Dec	easyJet	direct
17 Dec - 18 Dec	Vueling Airlines
15 Dec - 18 Dec	Vueling Airlines
14 Dec - 18 Dec	Vueling Airlines
25 Dec - 30 Dec	easyJet
23 Dec - 30 Dec	easyJet
24 Dec - 27 Dec	easyJet
25 Dec - 30 Dec	easyJet	direct
17 Dec - 25 Dec	Vueling Airlines
16 Dec - 02 Jan	easyJet
22 Dec - 05 Jan	Lufthansa
24 Dec - 05 Jan	Lufthansa
16 Dec - 02 Jan	easyJet	direct
23 Dec - 02 Jan	easyJet
23 Dec - 03 Jan	easyJet
26 Dec - 02 Jan	easyJet
22 Dec - 03 Jan	Lufthansa
19 Dec - 04 Jan	easyJet
24 Dec - 05 Jan	easyJet	direct

Also check the deals for one-way flights from Basel to Porto 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 Basel to Porto in December from $191

Return flights