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

Return flights

04 Dec - 10 Dec	Air France
05 Dec - 07 Dec	KLM
04 Dec - 07 Dec	KLM
06 Dec - 07 Dec	KLM
10 Dec - 17 Dec	Air France
13 Dec - 16 Dec	Lufthansa
06 Dec - 13 Dec	Lufthansa
10 Dec - 12 Dec	Lufthansa
08 Dec - 10 Dec	easyJet
08 Dec - 14 Dec	KLM
31 Dec - 07 Jan	KLM
29 Dec - 01 Jan	Wizz Air
23 Dec - 05 Jan	Wizz Air
25 Dec - 04 Jan	KLM
22 Dec - 04 Jan	Wizz Air
28 Dec - 02 Jan	Wizz Air
31 Dec - 02 Jan	easyJet
26 Dec - 02 Jan	Wizz Air

Also check the deals for one-way flights from Basel to Helsinki 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 Helsinki in December from $201

Return flights