Cheapest return flights from Seattle to Keflavik in March from $632

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 March 2026 (see full year).

Return flights

30 Mar - 07 Apr Lufthansa
26 Mar - 03 Apr Lufthansa
10 Mar - 17 Mar Hawaiian Airlines
29 Mar - 06 Apr Lufthansa
06 Mar - 14 Mar Lufthansa
13 Mar - 21 Mar Lufthansa
09 Mar - 16 Mar Icelandair direct
10 Mar - 17 Mar Icelandair direct
04 Mar - 12 Mar Icelandair direct
10 Mar - 18 Mar Icelandair direct
18 Mar - 26 Mar Icelandair direct
02 Mar - 10 Mar Icelandair direct
12 Mar - 20 Mar Icelandair direct
29 Mar - 06 Apr Icelandair direct
30 Mar - 07 Apr Icelandair direct
26 Mar - 03 Apr Icelandair direct
24 Mar - 01 Apr Icelandair direct
25 Mar - 02 Apr Icelandair direct
28 Mar - 05 Apr Icelandair direct
27 Mar - 04 Apr Icelandair direct

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

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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