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

Return flights

12 Jan - 19 Jan	easyJet
14 Jan - 17 Jan	easyJet
12 Jan - 19 Jan	Fly Play	direct
09 Jan - 12 Jan	Fly Play	direct
23 Jan - 26 Jan	Fly Play	direct
19 Jan - 23 Jan	Fly Play	direct
10 Jan - 17 Jan	easyJet
11 Jan - 18 Jan	easyJet
15 Jan - 18 Jan	Icelandair	direct
08 Jan - 11 Jan	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 $174

Return flights