AirHint found the following cheapest return flights from Detroit (DTW) to London (LHR) in September 2025 (see full year).

Return flights

01 Sep - 15 Sep	Icelandair
13 Sep - 21 Sep	Icelandair
30 Sep - 07 Oct	Icelandair
30 Sep - 14 Oct	Icelandair
30 Sep - 09 Oct	Icelandair
13 Sep - 23 Sep	Icelandair
20 Sep - 30 Sep	Icelandair
23 Sep - 29 Sep	Icelandair
23 Sep - 30 Sep	Icelandair
15 Sep - 29 Sep	Icelandair
11 Sep - 18 Sep	Icelandair
30 Sep - 22 Oct	Icelandair
18 Sep - 07 Oct	Icelandair
29 Sep - 13 Oct	Icelandair
10 Sep - 16 Sep	Spirit Airlines
16 Sep - 23 Sep	Icelandair
30 Sep - 23 Oct	Icelandair
30 Sep - 19 Oct	Icelandair
24 Sep - 28 Oct	jetBlue
18 Sep - 02 Oct	Icelandair

Also check the deals for one-way flights from Detroit to London in September.

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 London in September from 431€

Return flights