Cheapest return flights from Washington to Keflavik in September from $478

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

09 Sep - 16 Sep jetBlue
30 Sep - 07 Oct jetBlue
01 Sep - 10 Sep Air Canada
01 Sep - 11 Sep Air Canada
02 Sep - 11 Sep Air Canada
23 Sep - 30 Sep jetBlue
04 Sep - 12 Sep Air Canada
14 Sep - 21 Sep United
16 Sep - 24 Sep Air Canada
04 Sep - 11 Sep Air Canada
03 Sep - 11 Sep Air Canada
25 Sep - 02 Oct Air France
24 Sep - 03 Oct KLM
26 Sep - 10 Oct jetBlue
23 Sep - 25 Oct British Airways

Also check the deals for one-way flights from Washington to Keflavik in September.

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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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