Cheapest one-way flights from Seattle to Keflavik in August from $426

AirHint found the following cheapest one-way flights from Seattle (SEA) to Keflavik (KEF) in August 2026 (see full year).

One-Way flights

12 Aug Lufthansa
12 Aug Icelandair direct
15 Aug Air Canada
15 Aug Icelandair direct

Also check the deals for return flights from Seattle to Keflavik in August.

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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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