Cheapest return flights from Seattle to Keflavik in April from $476

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

Return flights

15 Apr - 22 Apr Icelandair direct
08 Apr - 15 Apr Icelandair direct
18 Apr - 25 Apr Icelandair direct
23 Apr - 30 Apr Icelandair direct
13 Apr - 20 Apr Icelandair direct
19 Apr - 26 Apr Icelandair direct
27 Apr - 04 May Air France
28 Apr - 05 May Icelandair direct
27 Apr - 04 May Icelandair direct
10 Apr - 19 Apr Icelandair direct
03 Apr - 11 Apr Icelandair direct
03 Apr - 10 Apr Icelandair direct

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

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