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

Return flights

16 Dec - 08 Jan	easyJet
12 Dec - 14 Dec	easyJet
14 Dec - 18 Dec	easyJet
13 Dec - 01 Jan	easyJet
14 Dec - 18 Dec	Icelandair	direct
16 Dec - 01 Jan	easyJet
18 Dec - 01 Jan	easyJet
30 Dec - 01 Jan	easyJet
28 Dec - 01 Jan	Icelandair	direct
18 Dec - 03 Jan	easyJet
21 Dec - 04 Jan	TUI
25 Dec - 30 Dec	LOT
22 Dec - 28 Dec	easyJet
20 Dec - 26 Dec	easyJet
23 Dec - 28 Dec	easyJet
20 Dec - 28 Dec	easyJet
18 Dec - 01 Jan	Icelandair	direct
21 Dec - 28 Dec	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 $240

Return flights