Cheapest one-way flights from Seattle to Keflavik in May from $295

Best time to book flights for Seattle (SEA) to Keflavik (KEF) flights at AirHint

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

One-Way flights

10 May Alaska Airlines
19 May Alaska Airlines
18 May Alaska Airlines
23 May Alaska Airlines
10 May Icelandair direct
23 May Icelandair direct
21 May Icelandair direct
18 May Icelandair direct
19 May Icelandair direct

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

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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