Cheapest return flights from Phoenix (PHX) to Keflavik (KEF), December

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Dates, airline, and price
Dates Airline Price
22 Dec 29 Dec Frontier Airlines
09 Dec 16 Dec Frontier Airlines
10 Dec 17 Dec Southwest Airlines
15 Dec 22 Dec Frontier Airlines
16 Dec 23 Dec Frontier Airlines
11 Dec 18 Dec Icelandair
12 Dec 19 Dec Alaska Airlines
17 Dec 24 Dec Southwest Airlines
20 Dec 27 Dec Frontier Airlines
19 Dec 26 Dec Southwest Airlines
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deals for one-way flights from Phoenix to Keflavik in December.

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Updated Jul 22, 2026.

About these fares

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