Cheapest return flights from Washington to Keflavik in September from 262€

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

Return flights

28 Sep - 05 Oct Icelandair direct
07 Sep - 14 Sep Icelandair direct
17 Sep - 24 Sep Icelandair direct
06 Sep - 14 Sep Icelandair direct
06 Sep - 15 Sep Icelandair direct
05 Sep - 12 Sep Icelandair direct
06 Sep - 13 Sep Icelandair direct
07 Sep - 13 Sep Icelandair direct
14 Sep - 04 Oct Icelandair direct
13 Sep - 04 Oct Icelandair direct
22 Sep - 01 Oct Icelandair direct
27 Sep - 02 Oct Icelandair direct
12 Sep - 14 Sep Icelandair direct
12 Sep - 21 Sep Icelandair direct
04 Sep - 14 Sep Icelandair direct
13 Sep - 10 Oct Icelandair direct
26 Sep - 05 Oct Icelandair direct
29 Sep - 06 Oct Icelandair direct
23 Sep - 06 Oct Icelandair direct
17 Sep - 11 Oct Icelandair direct

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

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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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