Cheapest return flights from Seattle to Keflavik in January from 423€

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

Return flights

06 Jan - 13 Jan Icelandair direct
20 Jan - 27 Jan Icelandair direct
22 Jan - 29 Jan Icelandair direct
24 Jan - 31 Jan Icelandair direct
30 Jan - 07 Feb Icelandair direct
28 Jan - 04 Feb Icelandair direct
30 Jan - 06 Feb Icelandair direct
26 Jan - 02 Feb Icelandair direct
17 Jan - 24 Jan Lufthansa
18 Jan - 25 Jan Icelandair direct
16 Jan - 23 Jan Icelandair
16 Jan - 20 Jan Icelandair direct

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

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