Cheapest return flights from Seattle to Keflavik in March from $487

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

Return flights

30 Mar - 06 Apr Icelandair direct
31 Mar - 07 Apr Icelandair direct
08 Mar - 18 Mar Icelandair direct
28 Mar - 02 Apr Icelandair direct
27 Mar - 03 Apr Icelandair direct
09 Mar - 16 Mar Icelandair direct
25 Mar - 01 Apr Alaska Airlines
02 Mar - 09 Mar Icelandair direct
03 Mar - 10 Mar Icelandair direct
26 Mar - 02 Apr Hawaiian Airlines
26 Mar - 02 Apr Icelandair direct
05 Mar - 12 Mar Icelandair direct
18 Mar - 27 Mar Alaska Airlines
23 Mar - 30 Mar Icelandair
07 Mar - 14 Mar Icelandair direct
17 Mar - 24 Mar Icelandair direct
18 Mar - 27 Mar Icelandair direct

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

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