Cheapest return flights from Washington to Keflavik in September from $527

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

Return flights

12 Sep - 19 Sep Scandinavian Airlines
18 Sep - 22 Sep Scandinavian Airlines
03 Sep - 07 Sep Scandinavian Airlines
20 Sep - 27 Sep Icelandair direct
18 Sep - 22 Sep Icelandair direct
12 Sep - 19 Sep Icelandair direct
14 Sep - 21 Sep Scandinavian Airlines
03 Sep - 07 Sep Icelandair direct

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

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