Cheapest return flights from Portland to Keflavik in September from 651€

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

22 Sep - 03 Oct Air France
27 Sep - 07 Oct Air France
27 Sep - 08 Oct Air France
21 Sep - 02 Oct Air France
20 Sep - 01 Oct Air France
28 Sep - 09 Oct Air France
29 Sep - 10 Oct Air France
29 Sep - 07 Oct Air France
30 Sep - 06 Oct Air France
29 Sep - 06 Oct Air France
07 Sep - 15 Sep Alaska Airlines
13 Sep - 23 Sep Air France
01 Sep - 08 Sep Air France
08 Sep - 16 Sep Air France
11 Sep - 22 Sep Air France
01 Sep - 12 Sep Air France
07 Sep - 18 Sep Air France
22 Sep - 30 Sep Air France
23 Sep - 29 Sep Air France
24 Sep - 30 Sep 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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