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

Return flights

27 Aug - 03 Sep	Air Canada
18 Aug - 25 Aug	Air Canada
19 Aug - 26 Aug	Air Canada
22 Aug - 29 Aug	Air Canada
20 Aug - 27 Aug	Air Canada
21 Aug - 28 Aug	Air Canada
23 Aug - 30 Aug	Air Canada
07 Aug - 14 Aug	Air Canada
26 Aug - 02 Sep	Air Canada
14 Aug - 21 Aug	Air Canada
24 Aug - 31 Aug	Air Canada
31 Aug - 07 Sep	Air Canada
05 Aug - 13 Aug	Air Canada
25 Aug - 01 Sep	jetBlue
30 Aug - 06 Sep	jetBlue
29 Aug - 05 Sep	jetBlue
28 Aug - 02 Sep	Air Canada
30 Aug - 07 Sep	Delta
28 Aug - 04 Sep	jetBlue
28 Aug - 01 Sep	Delta

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

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

Cheapest return flights from Washington to Keflavik in August from 402€

Return flights