Cheapest return flights from Portland to Keflavik in September from 362€

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

Return flights

03 Sep - 10 Sep Air Canada
01 Sep - 08 Sep Air Canada
02 Sep - 09 Sep Air Canada
04 Sep - 11 Sep Air Canada
05 Sep - 12 Sep Air Canada
06 Sep - 13 Sep Air Canada
12 Sep - 08 Oct Delta
12 Sep - 08 Oct Icelandair direct
05 Sep - 12 Sep Icelandair direct
06 Sep - 13 Sep Icelandair direct
03 Sep - 10 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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