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

Return flights

18 Jan - 25 Jan	easyJet
11 Jan - 18 Jan	easyJet
12 Jan - 19 Jan	easyJet
13 Jan - 20 Jan	easyJet
09 Jan - 16 Jan	Fly Play	direct
12 Jan - 19 Jan	Fly Play	direct
14 Jan - 21 Jan	easyJet
10 Jan - 17 Jan	Wizz Air
08 Jan - 15 Jan	easyJet
08 Jan - 15 Jan	Icelandair	direct

Also check the deals for one-way flights from Keflavik to Lisbon 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 Keflavik to Lisbon in January from 171€

Return flights