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

Return flights

10 Dec - 15 Dec	Ryanair
06 Dec - 10 Dec	Ryanair
05 Dec - 10 Dec	Ryanair
06 Dec - 12 Dec	Ryanair
15 Dec - 23 Dec	Norwegian Air Sweden AOC
17 Dec - 24 Dec	KLM
10 Dec - 14 Dec	Air France
04 Dec - 08 Jan	Air France
13 Dec - 17 Dec	Ryanair
11 Dec - 14 Dec	Ryanair
16 Dec - 23 Dec	airBaltic
13 Dec - 06 Jan	KLM
07 Dec - 07 Jan	Norwegian Air Sweden AOC
29 Dec - 07 Jan	Ryanair
17 Dec - 07 Jan	KLM
30 Dec - 07 Jan	Norwegian Air Sweden AOC
25 Dec - 11 Jan	airBaltic
31 Dec - 06 Jan	KLM
23 Dec - 09 Jan	Ryanair
29 Dec - 05 Jan	Ryanair

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 151€

Return flights