AirHint found the following cheapest return flights from Lisbon (LIS) to Keflavik (KEF) in January 2026 (see full year).

Return flights

12 Jan - 18 Jan	easyJet
19 Jan - 22 Jan	easyJet
16 Jan - 22 Jan	easyJet
28 Jan - 03 Feb	easyJet
23 Jan - 03 Feb	easyJet
11 Jan - 18 Jan	easyJet
30 Jan - 06 Feb	easyJet
17 Jan - 21 Jan	easyJet
18 Jan - 21 Jan	easyJet
26 Jan - 30 Jan	easyJet
09 Jan - 13 Jan	easyJet
18 Jan - 23 Jan	easyJet
15 Jan - 22 Jan	easyJet
30 Jan - 05 Feb	easyJet
26 Jan - 11 Feb	easyJet
29 Jan - 05 Feb	easyJet
31 Jan - 10 Feb	easyJet
31 Jan - 05 Feb	Ryanair
29 Jan - 02 Feb	easyJet
29 Jan - 05 Feb	Icelandair	direct

Also check the deals for one-way flights from Lisbon to Keflavik in January.

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 Lisbon to Keflavik in January from 146€

Return flights