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

Return flights

07 Jul - 14 Jul	Icelandair	direct
09 Jul - 16 Jul	Icelandair	direct
08 Jul - 14 Jul	Icelandair	direct
15 Jul - 22 Jul	Icelandair	direct
02 Jul - 07 Jul	Air Canada
10 Jul - 14 Jul	Air France	direct
19 Jul - 29 Jul	Air France	direct
11 Jul - 16 Jul	Delta
03 Jul - 10 Jul	United
29 Jul - 05 Aug	United
31 Jul - 07 Aug	United
19 Jul - 26 Jul	United
27 Jul - 03 Aug	Air France
29 Jul - 08 Aug	Delta
29 Jul - 05 Aug	Icelandair	direct
27 Jul - 03 Aug	Icelandair	direct
29 Jul - 08 Aug	Icelandair	direct

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

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 July from $445

Return flights