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

Return flights

03 Dec - 10 Dec	Ryanair
08 Dec - 11 Dec	Ryanair
10 Dec - 15 Jan	Ryanair
10 Dec - 13 Dec	Ryanair
01 Dec - 06 Dec	Ryanair
01 Dec - 05 Dec	Ryanair
08 Dec - 13 Dec	Ryanair
11 Dec - 13 Dec	Ryanair
06 Dec - 11 Dec	Ryanair
08 Dec - 15 Dec	Ryanair
03 Dec - 07 Dec	Ryanair
17 Dec - 05 Jan	Ryanair
31 Dec - 05 Jan	Vueling Airlines
25 Dec - 03 Jan	easyJet
29 Dec - 05 Jan	Ryanair
22 Dec - 03 Jan	Ryanair
22 Dec - 02 Jan	Ryanair
30 Dec - 05 Jan	Ryanair
23 Dec - 03 Jan	easyJet
20 Dec - 01 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 141€

Return flights