Cheapest return flights from Seattle to Keflavik in March from $614

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

Return flights

24 Mar - 31 Mar Icelandair direct
22 Mar - 29 Mar Icelandair direct
05 Mar - 12 Mar Lufthansa
04 Mar - 11 Mar Alaska Airlines
18 Mar - 11 Apr Lufthansa
20 Mar - 27 Mar Icelandair direct
02 Mar - 09 Mar Icelandair direct
18 Mar - 11 Apr Icelandair direct
06 Mar - 13 Mar Lufthansa
07 Mar - 28 Mar Icelandair direct
03 Mar - 10 Mar Icelandair direct
18 Mar - 25 Mar Icelandair direct
28 Mar - 04 Apr Icelandair direct

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

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