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

Return flights

08 Dec - 13 Dec	Scandinavian Airlines
06 Dec - 13 Dec	Scandinavian Airlines
08 Dec - 15 Dec	jetBlue
11 Dec - 15 Dec	jetBlue
14 Dec - 19 Dec	jetBlue
15 Dec - 22 Dec	jetBlue
15 Dec - 20 Dec	jetBlue
01 Dec - 15 Dec	jetBlue
13 Dec - 17 Dec	Icelandair
17 Dec - 24 Dec	jetBlue
21 Dec - 10 Jan	jetBlue
27 Dec - 17 Jan	jetBlue
26 Dec - 17 Jan	jetBlue
29 Dec - 02 Jan	jetBlue
27 Dec - 01 Jan	Scandinavian Airlines
25 Dec - 03 Jan	Icelandair
26 Dec - 04 Jan	jetBlue

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

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 December from $555

Return flights