Cheapest return flights from Washington to Keflavik in December from 430€

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

Return flights

14 Dec - 18 Dec Icelandair direct
07 Dec - 11 Dec Icelandair direct
07 Dec - 12 Dec Icelandair direct
15 Dec - 19 Dec Icelandair direct
15 Dec - 23 Dec Icelandair direct
07 Dec - 27 Dec Icelandair direct
05 Dec - 10 Dec Icelandair direct
30 Dec - 17 Jan Icelandair direct
01 Dec - 08 Dec Icelandair direct
13 Dec - 18 Dec Icelandair direct
11 Dec - 15 Dec Icelandair direct
30 Dec - 06 Jan Icelandair
20 Dec - 10 Jan Frontier Airlines
19 Dec - 10 Jan Frontier Airlines
30 Dec - 01 Jan Icelandair
30 Dec - 06 Jan Icelandair direct
27 Dec - 06 Jan Icelandair
08 Dec - 03 Jan Icelandair direct
20 Dec - 10 Jan Icelandair direct
26 Dec - 05 Jan Frontier Airlines

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

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