Cheapest return flights from Seattle to Keflavik in October from $431

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

Return flights

13 Oct - 23 Oct Icelandair direct
29 Oct - 05 Nov Icelandair direct
13 Oct - 20 Oct Icelandair direct
16 Oct - 23 Oct Icelandair direct
08 Oct - 15 Oct Icelandair direct
12 Oct - 19 Oct Icelandair direct
30 Oct - 06 Nov Icelandair direct
31 Oct - 07 Nov Icelandair direct
15 Oct - 22 Oct Icelandair direct
07 Oct - 19 Oct Icelandair direct
02 Oct - 05 Oct Air Canada
11 Oct - 19 Oct Icelandair direct
24 Oct - 05 Nov Icelandair direct
05 Oct - 11 Oct Alaska Airlines
28 Oct - 04 Nov Icelandair direct
27 Oct - 03 Nov Icelandair direct
25 Oct - 01 Nov Icelandair direct
26 Oct - 02 Nov Icelandair direct

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

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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