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

Return flights

08 Dec - 10 Dec	Ryanair
06 Dec - 10 Dec	Ryanair
06 Dec - 13 Dec	Ryanair
03 Dec - 10 Dec	Ryanair
04 Dec - 10 Dec	Ryanair
06 Dec - 12 Dec	Ryanair
04 Dec - 09 Dec	Ryanair
03 Dec - 07 Dec	Ryanair
02 Dec - 04 Dec	Ryanair
05 Dec - 10 Dec	Ryanair
19 Dec - 03 Jan	Vueling Airlines
30 Dec - 04 Jan	Wizz Air
25 Dec - 03 Jan	Finnair
26 Dec - 01 Jan	Ryanair
23 Dec - 03 Jan	Finnair
29 Dec - 01 Jan	Ryanair
28 Dec - 03 Jan	TAP
29 Dec - 03 Jan	Ryanair
26 Dec - 04 Jan	Ryanair
26 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 $184

Return flights