Cheapest one-way flights from Seattle to Keflavik in October from $260

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

One-Way flights

10 Oct WestJet
21 Oct Air France
10 Oct Icelandair direct
01 Oct WestJet
01 Oct Icelandair direct
02 Oct Icelandair direct
03 Oct Icelandair direct
04 Oct Icelandair direct
09 Oct Icelandair direct
11 Oct Icelandair direct

Also check the deals for return 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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