Cheapest return flights from Phoenix to Keflavik in March from $588

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

Return flights

02 Mar - 09 Mar Frontier Airlines
05 Mar - 14 Mar Frontier Airlines
09 Mar - 16 Mar Frontier Airlines
05 Mar - 12 Mar Frontier Airlines
04 Mar - 11 Mar Frontier Airlines
10 Mar - 17 Mar Hawaiian Airlines
11 Mar - 18 Mar jetBlue
01 Mar - 08 Mar Frontier Airlines
26 Mar - 29 Mar jetBlue
07 Mar - 14 Mar Hawaiian Airlines
15 Mar - 14 Apr Frontier Airlines

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

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