Cheapest one-way flights from Portland to Keflavik in September from 300€

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

One-Way flights

26 Sep Allegiant Air
25 Sep Frontier Airlines
19 Sep Allegiant Air
20 Sep Alaska Airlines
25 Sep Icelandair direct
17 Sep Air France
18 Sep Air France
26 Sep Icelandair direct
17 Sep Icelandair direct
20 Sep Icelandair direct

Also check the deals for return 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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