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

Return flights

13 Dec - 20 Dec	easyJet
16 Dec - 23 Dec	Lufthansa
15 Dec - 22 Dec	easyJet
14 Dec - 21 Dec	easyJet
22 Dec - 12 Jan	Fly Play	direct
19 Dec - 02 Jan	Fly Play	direct
17 Dec - 24 Dec	easyJet
22 Dec - 29 Dec	Fly Play	direct
23 Dec - 11 Jan	easyJet
21 Dec - 09 Jan	easyJet
21 Dec - 11 Jan	easyJet
24 Dec - 29 Dec	easyJet
21 Dec - 26 Dec	easyJet
21 Dec - 29 Dec	easyJet
21 Dec - 11 Jan	Icelandair	direct

Also check the deals for one-way flights from Reykjavik 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 Reykjavik to Lisbon in December from $185

Return flights