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

Return flights

09 Dec - 12 Dec	easyJet
09 Dec - 11 Dec	easyJet
11 Dec - 14 Dec	easyJet
10 Dec - 12 Dec	easyJet
10 Dec - 11 Dec	easyJet
03 Dec - 07 Dec	easyJet
14 Dec - 18 Dec	easyJet
15 Dec - 18 Dec	easyJet
14 Dec - 08 Jan	easyJet
18 Dec - 05 Jan	easyJet
14 Dec - 18 Dec	Icelandair	direct
18 Dec - 01 Jan	easyJet
11 Dec - 14 Dec	Icelandair	direct
18 Dec - 04 Jan	easyJet
21 Dec - 01 Jan	TUI
18 Dec - 03 Jan	easyJet
20 Dec - 01 Jan	Transavia France
21 Dec - 04 Jan	TUI
19 Dec - 01 Jan	easyJet
23 Dec - 03 Jan	easyJet

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 191€

Return flights