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

Return flights

11 Dec - 15 Dec	Ryanair
06 Dec - 10 Dec	Ryanair
04 Dec - 09 Dec	Ryanair
05 Dec - 10 Dec	Ryanair
05 Dec - 12 Dec	Ryanair
05 Dec - 08 Dec	Ryanair
03 Dec - 10 Dec	Ryanair
09 Dec - 15 Dec	Ryanair
11 Dec - 08 Jan	Ryanair
05 Dec - 11 Dec	Ryanair
04 Dec - 18 Dec	Ryanair
15 Dec - 08 Jan	KLM
17 Dec - 09 Jan	Air France
18 Dec - 10 Jan	Ryanair
27 Dec - 10 Jan	Norwegian Air Sweden AOC
18 Dec - 08 Jan	Ryanair
26 Dec - 15 Jan	KLM
13 Dec - 04 Jan	Ryanair
31 Dec - 07 Jan	Ryanair
21 Dec - 10 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 129€

Return flights