Cheapest return flights from Seattle to Keflavik in October from 382€

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

Return flights

09 Oct - 16 Oct Icelandair direct
12 Oct - 19 Oct Icelandair direct
15 Oct - 22 Oct Icelandair direct
24 Oct - 31 Oct Icelandair direct
29 Oct - 05 Nov Icelandair direct
18 Oct - 25 Oct Icelandair direct
01 Oct - 10 Oct Icelandair direct
21 Oct - 28 Oct Icelandair direct
04 Oct - 11 Oct Alaska Airlines
06 Oct - 13 Oct Icelandair direct
23 Oct - 08 Nov Icelandair direct
24 Oct - 08 Nov Icelandair direct
02 Oct - 06 Oct 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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