Cheapest return flights from Portland to Keflavik in September from 479€

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 September 2025 (see full year).

Return flights

06 Sep - 12 Sep jetBlue
13 Sep - 22 Sep jetBlue
13 Sep - 23 Sep jetBlue
23 Sep - 29 Sep jetBlue
10 Sep - 19 Sep jetBlue
23 Sep - 03 Oct jetBlue
07 Sep - 16 Sep Alaska Airlines
07 Sep - 15 Sep Alaska Airlines
27 Sep - 07 Oct jetBlue
23 Sep - 02 Oct jetBlue
04 Sep - 12 Sep Alaska Airlines
16 Sep - 24 Sep jetBlue
06 Sep - 13 Sep jetBlue
24 Sep - 03 Oct jetBlue
24 Sep - 01 Oct jetBlue
17 Sep - 02 Oct jetBlue
22 Sep - 01 Oct Air France
29 Sep - 07 Oct Air France
22 Sep - 02 Oct Air France
28 Sep - 08 Oct Air France

Also check the deals for one-way flights from Portland to Keflavik in September.

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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