Cheapest return flights from Seattle to Keflavik in April from $478

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

Return flights

15 Apr - 23 Apr Icelandair direct
14 Apr - 21 Apr Icelandair direct
20 Apr - 27 Apr Icelandair direct
23 Apr - 30 Apr Icelandair direct
29 Apr - 06 May Icelandair direct
24 Apr - 01 May KLM
08 Apr - 15 Apr Icelandair direct
17 Apr - 24 Apr Icelandair direct
01 Apr - 30 Apr Icelandair direct
26 Apr - 03 May Icelandair direct
10 Apr - 16 Apr Icelandair
24 Apr - 02 May Icelandair direct
02 Apr - 09 Apr Icelandair
08 Apr - 12 Apr Hawaiian Airlines

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

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