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

Return flights

03 Dec - 06 Dec	Ryanair
03 Dec - 10 Dec	Ryanair
04 Dec - 10 Dec	Ryanair
07 Dec - 10 Dec	Vueling Airlines
03 Dec - 09 Dec	Ryanair
04 Dec - 09 Dec	Ryanair
01 Dec - 04 Dec	Ryanair
09 Dec - 14 Dec	Ryanair
04 Dec - 07 Dec	Ryanair
05 Dec - 12 Dec	Ryanair
17 Dec - 05 Jan	Ryanair
18 Dec - 05 Jan	Ryanair
31 Dec - 07 Jan	Scandinavian Airlines
31 Dec - 06 Jan	Scandinavian Airlines
18 Dec - 01 Jan	Ryanair
31 Dec - 04 Jan	Scandinavian Airlines
23 Dec - 05 Jan	Ryanair
22 Dec - 04 Jan	Ryanair
24 Dec - 06 Jan	Vueling Airlines
19 Dec - 03 Jan	Ryanair

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 150€

Return flights