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

Return flights

06 Dec - 08 Dec	KLM
15 Dec - 19 Dec	easyJet
14 Dec - 20 Dec	Norwegian Air Sweden AOC
22 Dec - 28 Dec	Lufthansa
26 Dec - 03 Jan	Ryanair
22 Dec - 27 Dec	Lufthansa
26 Dec - 02 Jan	Ryanair
16 Dec - 23 Dec	KLM
26 Dec - 04 Jan	Ryanair
22 Dec - 26 Dec	Lufthansa
19 Dec - 23 Dec	Finnair
21 Dec - 27 Dec	Norwegian Air Sweden AOC
21 Dec - 26 Dec	Norwegian Air Sweden AOC
27 Dec - 04 Jan	Lufthansa
27 Dec - 04 Jan	Finnair	direct

Also check the deals for one-way flights from Lisbon 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 Lisbon to Helsinki in December from $290

Return flights