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

Return flights

08 Dec - 12 Dec	Scandinavian Airlines
10 Dec - 17 Dec	jetBlue
07 Dec - 12 Dec	jetBlue
14 Dec - 18 Dec	jetBlue
14 Dec - 19 Dec	jetBlue
10 Dec - 14 Dec	jetBlue
06 Dec - 13 Dec	jetBlue
11 Dec - 18 Dec	jetBlue
05 Dec - 10 Dec	jetBlue
15 Dec - 19 Dec	jetBlue
25 Dec - 17 Jan	jetBlue
26 Dec - 17 Jan	jetBlue
27 Dec - 06 Jan	jetBlue
31 Dec - 04 Jan	Air Canada
12 Dec - 03 Jan	jetBlue
27 Dec - 02 Jan	jetBlue
28 Dec - 03 Jan	Icelandair
26 Dec - 02 Jan	Air Canada
26 Dec - 01 Jan	jetBlue
19 Dec - 04 Jan	Air Canada

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.

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Cheapest return flights from Washington to Keflavik in December from $531

Return flights