Cheapest return flights from Seattle to Keflavik in October from $441

AirHint found the following cheapest return flights from Seattle (SEA) to Keflavik (KEF) in October 2025 (see full year).

Return flights

01 Oct - 08 Oct Scandinavian Airlines
12 Oct - 20 Oct Air France
01 Oct - 09 Oct Scandinavian Airlines
01 Oct - 11 Oct Scandinavian Airlines
06 Oct - 14 Oct Icelandair direct
01 Oct - 06 Oct Icelandair direct
08 Oct - 19 Oct Icelandair direct
01 Oct - 09 Oct Icelandair direct
01 Oct - 08 Oct Icelandair direct
01 Oct - 07 Oct Icelandair direct
27 Oct - 06 Nov Lufthansa
21 Oct - 01 Nov Icelandair direct
29 Oct - 08 Nov jetBlue
31 Oct - 08 Nov jetBlue
25 Oct - 01 Nov Hawaiian Airlines
28 Oct - 05 Nov Icelandair direct
25 Oct - 05 Nov Icelandair direct
25 Oct - 01 Nov Icelandair direct
29 Oct - 03 Nov Icelandair direct
28 Oct - 02 Nov Icelandair direct

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

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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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