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

Return flights

20 Aug - 27 Aug	Icelandair	direct
19 Aug - 26 Aug	Icelandair	direct
25 Aug - 01 Sep	Icelandair	direct
23 Aug - 31 Aug	Air France
21 Aug - 28 Aug	Delta
16 Aug - 23 Aug	Air Canada
14 Aug - 18 Aug	United
13 Aug - 24 Aug	Air Canada
27 Aug - 03 Sep	United
20 Aug - 31 Aug	Icelandair	direct
29 Aug - 05 Sep	United
23 Aug - 31 Aug	Delta	direct
04 Aug - 11 Aug	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.

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Cheapest return flights from Detroit to Keflavik in August from 290€

Return flights