Cheapest return flights from Washington to Keflavik in September from $477

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

Return flights

04 Sep - 07 Sep Icelandair direct
02 Sep - 13 Sep Icelandair direct
03 Sep - 10 Sep Icelandair direct
04 Sep - 13 Sep Icelandair direct
03 Sep - 07 Sep Icelandair direct
01 Sep - 07 Sep Icelandair direct
11 Sep - 13 Sep Icelandair direct
08 Sep - 15 Sep Icelandair direct
04 Sep - 10 Sep Icelandair direct
14 Sep - 22 Sep Icelandair direct

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.