Cheapest return DCA–KEF flights, September

AirHint found the following cheapest return flights from Washington (DCA) to Keflavik (KEF) in September 2026 (see full year).

Return flights

28 Sep - 05 Oct Icelandair
19 Sep - 26 Sep Icelandair
14 Sep - 21 Sep Icelandair
16 Sep - 23 Sep Icelandair
01 Sep - 08 Sep Icelandair
08 Sep - 15 Sep Icelandair
15 Sep - 22 Sep Icelandair
09 Sep - 16 Sep jetBlue
10 Sep - 17 Sep jetBlue
26 Sep - 06 Oct Icelandair
04 Sep - 11 Sep jetBlue
05 Sep - 12 Sep jetBlue
27 Sep - 04 Oct jetBlue
29 Sep - 13 Oct British Airways
19 Sep - 03 Oct British Airways
20 Sep - 01 Oct British Airways

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

Powered by

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.