Cheapest return flights from Seattle to Keflavik in March from $433

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 2025 (see full year).

Return flights

02 Mar - 10 Mar Spirit Airlines
03 Mar - 11 Mar Frontier Airlines
04 Mar - 11 Mar jetBlue
03 Mar - 12 Mar Alaska Airlines
18 Mar - 26 Mar Spirit Airlines
31 Mar - 08 Apr jetBlue
11 Mar - 20 Mar Spirit Airlines
10 Mar - 18 Mar Spirit Airlines
31 Mar - 07 Apr jetBlue
27 Mar - 03 Apr jetBlue
31 Mar - 06 Apr jetBlue
18 Mar - 25 Mar Spirit Airlines
10 Mar - 24 Mar British Airways
09 Mar - 17 Mar jetBlue
26 Mar - 01 Apr Spirit Airlines
28 Mar - 04 Apr jetBlue
27 Mar - 04 Apr jetBlue
26 Mar - 03 Apr jetBlue
30 Mar - 06 Apr jetBlue
29 Mar - 06 Apr jetBlue

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

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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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