Cheapest return flights from Seattle to Keflavik in January from $445

Best time to book flights for Seattle (SEA) to Keflavik (KEF) flights at AirHint

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

Return flights

07 Jan - 16 Jan Icelandair direct
17 Jan - 26 Jan Icelandair direct
21 Jan - 30 Jan Icelandair direct
26 Jan - 04 Feb Icelandair direct
28 Jan - 06 Feb Icelandair direct
16 Jan - 23 Jan Icelandair direct
18 Jan - 25 Jan Icelandair direct
19 Jan - 26 Jan Icelandair direct
20 Jan - 27 Jan Icelandair direct
21 Jan - 28 Jan Icelandair direct
22 Jan - 29 Jan Icelandair direct
23 Jan - 30 Jan Icelandair direct
25 Jan - 01 Feb Icelandair direct
26 Jan - 02 Feb Icelandair direct
27 Jan - 03 Feb Icelandair direct

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

Skyscanner

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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