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

Return flights

03 Dec - 08 Dec	Ryanair
04 Dec - 07 Dec	KLM
05 Dec - 09 Dec	KLM
31 Dec - 03 Jan	Norwegian Air Sweden AOC
03 Dec - 08 Dec	Finnair	direct
05 Dec - 09 Dec	Finnair	direct
18 Dec - 23 Dec	Ryanair
04 Dec - 07 Dec	Finnair	direct
30 Dec - 02 Jan	Lufthansa
25 Dec - 04 Jan	KLM
24 Dec - 28 Dec	KLM
14 Dec - 04 Jan	Air France
19 Dec - 28 Dec	airBaltic
18 Dec - 23 Dec	Finnair	direct
14 Dec - 04 Jan	Finnair	direct
19 Dec - 02 Jan	Finnair	direct
25 Dec - 04 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 173€

Return flights