Cheapest one-way flights from Seattle to Keflavik in October from $262

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
03 Oct WestJet
03 Oct Icelandair direct
10 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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