Cheapest return flights from Washington to Keflavik in December from $394

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

Return flights

10 Dec - 17 Dec Icelandair direct
15 Dec - 23 Dec Icelandair direct
08 Dec - 15 Dec Icelandair direct
15 Dec - 19 Dec Icelandair direct
14 Dec - 19 Dec Icelandair direct
07 Dec - 12 Dec Icelandair direct
08 Dec - 12 Dec Icelandair direct
10 Dec - 14 Dec Icelandair direct
07 Dec - 27 Dec Icelandair direct
05 Dec - 10 Dec Icelandair direct
26 Dec - 17 Jan Porter Airlines (Canada) Ltd
27 Dec - 06 Jan Icelandair direct
25 Dec - 17 Jan Icelandair direct
26 Dec - 17 Jan Icelandair direct
31 Dec - 04 Jan Air Canada
28 Dec - 03 Jan Porter Airlines (Canada) Ltd
19 Dec - 04 Jan Frontier Airlines
26 Dec - 01 Jan Porter Airlines (Canada) Ltd
27 Dec - 02 Jan Porter Airlines (Canada) Ltd
26 Dec - 02 Jan Porter Airlines (Canada) Ltd

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

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