Cheapest return flights from Washington to Keflavik in May from $541

Best time to book flights for Washington (IAD) to Keflavik (KEF) flights at AirHint

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

Return flights

01 May - 11 May Icelandair direct
12 May - 19 May Icelandair direct
24 May - 28 May Icelandair direct
25 May - 06 Jun Icelandair direct
12 May - 17 May Icelandair direct
09 May - 12 May Icelandair direct
23 May - 28 May Icelandair direct
23 May - 02 Jun Icelandair direct
15 May - 26 May Icelandair direct
17 May - 20 May Scandinavian Airlines
17 May - 20 May Icelandair direct

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

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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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