Cheapest return flights from Portland to Keflavik in March from $560

Best time to book flights for Portland (PDX) to Keflavik (KEF) flights at AirHint

AirHint found the following cheapest return flights from Portland (PDX) to Keflavik (KEF) in March 2025 (see full year).

Return flights

04 Mar - 12 Mar Alaska Airlines
02 Mar - 10 Mar Alaska Airlines
05 Mar - 13 Mar Alaska Airlines
03 Mar - 11 Mar Frontier Airlines
09 Mar - 17 Mar Alaska Airlines
18 Mar - 26 Mar Spirit Airlines
17 Mar - 25 Mar Frontier Airlines
10 Mar - 18 Mar Alaska Airlines
01 Mar - 09 Mar Frontier Airlines
30 Mar - 07 Apr Alaska Airlines
06 Mar - 14 Mar Alaska Airlines
27 Mar - 04 Apr Frontier Airlines
25 Mar - 02 Apr Frontier Airlines
24 Mar - 01 Apr Alaska Airlines
26 Mar - 03 Apr Alaska Airlines
29 Mar - 06 Apr Frontier Airlines
28 Mar - 05 Apr Alaska Airlines

Also check the deals for one-way flights from Portland 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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