Cheapest one-way flights from Seattle to Keflavik in August from 279€

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

One-Way flights

26 Aug WestJet
31 Aug Alaska Airlines
23 Aug WestJet
21 Aug United
17 Aug United
04 Aug Alaska Airlines
05 Aug Alaska Airlines
29 Aug United
23 Aug Icelandair direct
21 Aug Icelandair direct

Also check the deals for return 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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