Cheapest return flights from Seattle to Keflavik in August from 393€

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

Return flights

20 Aug - 27 Aug Icelandair direct
20 Aug - 28 Aug Icelandair direct
18 Aug - 26 Aug Icelandair direct
17 Aug - 26 Aug Icelandair direct
23 Aug - 29 Aug Icelandair direct
31 Aug - 05 Sep Icelandair direct
21 Aug - 25 Aug Delta
26 Aug - 19 Sep KLM
27 Aug - 19 Sep United
11 Aug - 17 Aug Icelandair direct
02 Aug - 16 Aug Icelandair direct
13 Aug - 21 Aug Icelandair direct
21 Aug - 25 Aug Icelandair direct
26 Aug - 20 Sep United
26 Aug - 21 Sep Air France
27 Aug - 21 Sep Air Canada
27 Aug - 20 Sep Air Canada
26 Aug - 01 Sep Frontier Airlines
26 Aug - 01 Sep Icelandair direct
27 Aug - 19 Sep Icelandair direct

Also check the deals for one-way flights from Seattle 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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