Cheapest return flights from Portland to Keflavik in September from $469

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

Return flights

04 Sep - 11 Sep Air Canada
29 Sep - 10 Oct Icelandair direct
30 Sep - 10 Oct Air France
03 Sep - 17 Sep Air Canada
30 Sep - 11 Oct Spirit Airlines
17 Sep - 24 Sep Icelandair direct
10 Sep - 24 Sep Icelandair direct
03 Sep - 17 Sep Icelandair direct

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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