Cheapest return flights from Portland to Keflavik in September from 526€

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

04 Sep - 15 Sep jetBlue
22 Sep - 03 Oct jetBlue
23 Sep - 03 Oct jetBlue
09 Sep - 17 Sep jetBlue
01 Sep - 09 Sep jetBlue
29 Sep - 10 Oct Air France
21 Sep - 02 Oct Air France
29 Sep - 07 Oct Air France
23 Sep - 01 Oct Air France
28 Sep - 08 Oct Air France
23 Sep - 02 Oct Air France
16 Sep - 24 Sep Air France
03 Sep - 11 Sep Air France
07 Sep - 18 Sep Air France
08 Sep - 19 Sep Air France
10 Sep - 19 Sep Air France
10 Sep - 18 Sep Air France
28 Sep - 09 Oct Delta
29 Sep - 09 Oct Delta
12 Sep - 20 Sep jetBlue

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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