Cheapest return flights from Seattle to Keflavik in May from $526

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

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

Return flights

06 May - 20 May Icelandair direct
08 May - 12 May Icelandair direct
08 May - 15 May Icelandair direct
11 May - 25 May Icelandair direct
04 May - 10 May Icelandair direct
02 May - 10 May Icelandair direct
02 May - 09 May Icelandair direct
01 May - 08 May Icelandair direct
01 May - 09 May Icelandair direct
26 May - 02 Jun Icelandair direct
29 May - 05 Jun Icelandair direct
31 May - 07 Jun Icelandair direct
27 May - 03 Jun Icelandair direct
01 May - 07 May Delta
11 May - 01 Jun KLM
23 May - 01 Jun Delta
11 May - 01 Jun Icelandair direct
25 May - 01 Jun Icelandair direct
23 May - 01 Jun Icelandair direct

Also check the deals for one-way 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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