AirHint found the following cheapest return flights from Washington (IAD) to Keflavik (KEF) in January 2026 (see full year).

Return flights

31 Jan - 07 Feb	Icelandair	direct
29 Jan - 01 Feb	Lufthansa
21 Jan - 27 Jan	Lufthansa
22 Jan - 25 Jan	Lufthansa
25 Jan - 31 Jan	Icelandair	direct
28 Jan - 01 Feb	Lufthansa
27 Jan - 01 Feb	Scandinavian Airlines
19 Jan - 27 Jan	Lufthansa
21 Jan - 28 Jan	Icelandair	direct
24 Jan - 28 Jan	Icelandair	direct
21 Jan - 23 Jan	Icelandair	direct
21 Jan - 27 Jan	Icelandair	direct
23 Jan - 27 Jan	Lufthansa
20 Jan - 27 Jan	Lufthansa
29 Jan - 01 Feb	Icelandair	direct
28 Jan - 01 Feb	Icelandair	direct
30 Jan - 01 Feb	Icelandair	direct
27 Jan - 01 Feb	Icelandair	direct

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

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 January from $482

Return flights