Cheapest return flights from Seattle to Keflavik in August from $667

AirHint found the following cheapest return flights from Seattle (SEA) to Keflavik (KEF) in August 2026 (see full year).

Return flights

29 Aug - 05 Sep Icelandair direct
15 Aug - 31 Aug Alaska Airlines direct
18 Aug - 25 Aug KLM
17 Aug - 21 Aug KLM
27 Aug - 16 Sep Delta
27 Aug - 16 Sep Icelandair direct
18 Aug - 25 Aug Icelandair direct
15 Aug - 21 Aug Icelandair direct
17 Aug - 21 Aug Icelandair direct
19 Aug - 26 Aug Icelandair direct
16 Aug - 23 Aug Icelandair direct
15 Aug - 22 Aug Air Canada
04 Aug - 11 Aug Icelandair direct

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

Powered by

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.

Book a cheap hotel in Keflavik

Cheap car rent in Keflavik

Feel free to contact us with any feedback or request another flight research.