Cheapest return flights from Washington to Keflavik in September from 409€

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

Return flights

04 Sep - 11 Sep jetBlue
01 Sep - 08 Sep Air Canada
01 Sep - 09 Sep United
01 Sep - 18 Sep United
23 Sep - 07 Oct Air France
09 Sep - 14 Sep Air Canada
11 Sep - 15 Sep United
17 Sep - 22 Sep United
16 Sep - 21 Sep United
17 Sep - 21 Sep United
06 Sep - 09 Sep Air Canada
10 Sep - 22 Oct British Airways

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.

Book a cheap hotel in Keflavik

Cheap car rent in Keflavik

Feel free to contact us with any feedback or request another flight research.