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

Return flights

23 Dec - 30 Dec	Lufthansa
19 Dec - 09 Jan	Ryanair
20 Dec - 07 Jan	Lufthansa
21 Dec - 07 Jan	Lufthansa
21 Dec - 05 Jan	Lufthansa
24 Dec - 04 Jan	Lufthansa
23 Dec - 30 Dec	Finnair	direct
22 Dec - 26 Dec	Norwegian Air Sweden AOC
22 Dec - 26 Dec	Finnair	direct
24 Dec - 04 Jan	Finnair	direct
21 Dec - 05 Jan	Finnair	direct

Also check the deals for one-way flights from Helsinki to Lisbon 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 Helsinki to Lisbon in December from 265€

Return flights