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 - 19 Jan	easyJet
12 Jan - 15 Jan	easyJet
23 Jan - 29 Jan	easyJet
09 Jan - 16 Jan	Fly Play	direct
19 Jan - 26 Jan	Fly Play	direct
16 Jan - 19 Jan	Fly Play	direct
25 Jan - 29 Jan	easyJet
11 Jan - 16 Jan	easyJet
26 Jan - 02 Feb	easyJet
26 Jan - 30 Jan	easyJet
26 Jan - 02 Feb	Fly Play	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 144€

Return flights