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

Return flights

24 Aug - 01 Sep	Icelandair	direct
25 Aug - 01 Sep	Icelandair	direct
18 Aug - 25 Aug	Icelandair	direct
13 Aug - 20 Aug	Air Canada
29 Aug - 02 Sep	Air Canada
15 Aug - 24 Aug	Air Canada
06 Aug - 12 Aug	Air Canada
21 Aug - 28 Aug	United
23 Aug - 30 Aug	United
29 Aug - 07 Sep	Air Canada
31 Aug - 07 Sep	Icelandair	direct
29 Aug - 09 Sep	Air Canada
29 Aug - 02 Sep	Icelandair	direct
06 Aug - 12 Aug	Icelandair	direct
17 Aug - 24 Aug	United
29 Aug - 09 Sep	Icelandair	direct
09 Aug - 15 Aug	Air Canada
28 Aug - 04 Sep	United
05 Aug - 12 Aug	Icelandair	direct
29 Aug - 06 Sep	Icelandair	direct

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

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

Cheapest return flights from Detroit to Keflavik in August from $313

Return flights