Cheapest return flights from Seattle to Keflavik in August from $1131

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

Return flights

08 Aug - 15 Aug Icelandair direct

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

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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