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

Return flights

03 Dec - 08 Dec	Ryanair
06 Dec - 10 Dec	Ryanair
05 Dec - 10 Dec	Ryanair
06 Dec - 13 Dec	Ryanair
02 Dec - 06 Dec	Ryanair
05 Dec - 12 Dec	KLM
02 Dec - 10 Dec	Lufthansa
25 Dec - 08 Jan	Norwegian Air Sweden AOC
06 Dec - 08 Dec	Ryanair
20 Dec - 31 Dec	airBaltic
25 Dec - 08 Jan	Finnair	direct
02 Dec - 10 Dec	Finnair	direct
22 Dec - 01 Jan	Finnair
27 Dec - 02 Jan	Ryanair
22 Dec - 01 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 181€

Return flights