Cheapest return flights from Washington to Keflavik in August from $311

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

Return flights

10 Aug - 14 Aug Icelandair direct
15 Aug - 21 Aug Icelandair direct
24 Aug - 29 Aug Icelandair direct
20 Aug - 25 Aug Icelandair direct
10 Aug - 22 Aug Icelandair direct
17 Aug - 21 Aug Icelandair direct
20 Aug - 26 Aug Icelandair direct
25 Aug - 30 Aug Icelandair direct
22 Aug - 26 Aug Icelandair direct
21 Aug - 28 Aug Icelandair direct
30 Aug - 09 Sep Icelandair direct
27 Aug - 03 Sep Icelandair direct
27 Aug - 02 Sep Icelandair direct
28 Aug - 03 Sep Icelandair direct
28 Aug - 21 Sep Icelandair direct
23 Aug - 01 Sep Icelandair direct
30 Aug - 06 Sep Icelandair direct
29 Aug - 02 Sep Icelandair direct
28 Aug - 02 Sep Icelandair direct
29 Aug - 01 Sep Icelandair direct

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

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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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