Cheapest return flights from Seattle to Keflavik in October from $508

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 October 2025 (see full year).

Return flights

11 Oct - 18 Oct Icelandair direct
09 Oct - 16 Oct Icelandair direct
04 Oct - 12 Oct Icelandair direct
14 Oct - 19 Oct Icelandair direct
02 Oct - 09 Oct Icelandair direct
15 Oct - 22 Oct Icelandair direct
17 Oct - 24 Oct Icelandair direct
01 Oct - 08 Oct Icelandair direct
08 Oct - 15 Oct Icelandair direct
13 Oct - 20 Oct Icelandair direct
27 Oct - 03 Nov Hawaiian Airlines
30 Oct - 06 Nov Hawaiian Airlines
27 Oct - 06 Nov Hawaiian Airlines
31 Oct - 07 Nov Hawaiian Airlines
30 Oct - 05 Nov Alaska Airlines
28 Oct - 05 Nov Alaska Airlines
28 Oct - 04 Nov Alaska Airlines
26 Oct - 02 Nov Hawaiian Airlines
25 Oct - 01 Nov Alaska Airlines
27 Oct - 03 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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