Cheapest return flights from Washington to Keflavik in September from 504€

Best time to book flights for Washington (DCA) to Keflavik (KEF) flights at AirHint

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

Return flights

03 Sep - 01 Oct Air Canada
29 Sep - 06 Oct Air Canada
25 Sep - 01 Oct Air Canada
26 Sep - 02 Oct Air Canada
10 Sep - 24 Sep United
10 Sep - 23 Sep United
24 Sep - 30 Sep Air Canada
04 Sep - 15 Sep Air Canada
05 Sep - 13 Sep Air Canada
12 Sep - 15 Sep Air Canada
25 Sep - 30 Sep Air Canada

Also check the deals for one-way flights from Washington 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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