Cheapest return flights from Seattle to Keflavik in May from $547

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

Return flights

27 May - 06 Jun Icelandair direct
20 May - 27 May Icelandair direct
04 May - 11 May Icelandair direct
07 May - 14 May Icelandair direct
29 May - 14 Jun Icelandair direct
04 May - 08 May Icelandair direct
29 May - 05 Jun Icelandair direct
30 May - 06 Jun Icelandair direct
31 May - 07 Jun Icelandair direct
14 May - 21 May Delta
18 May - 25 May Delta
15 May - 22 May Delta
04 May - 09 May Icelandair direct
10 May - 17 May Icelandair direct
15 May - 22 May Icelandair direct

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

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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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