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

Return flights

22 Jul - 05 Aug	jetBlue
23 Jul - 09 Aug	jetBlue
25 Jul - 28 Jul	Spirit Airlines
15 Jul - 09 Aug	jetBlue
22 Jul - 04 Aug	jetBlue
30 Jul - 06 Aug	Spirit Airlines
18 Jul - 24 Jul	Spirit Airlines
20 Jul - 02 Aug	jetBlue
15 Jul - 23 Jul	Spirit Airlines
20 Jul - 27 Jul	jetBlue
18 Jul - 25 Jul	Spirit Airlines
20 Jul - 26 Jul	Spirit Airlines
16 Jul - 30 Jul	jetBlue
23 Jul - 31 Jul	jetBlue
17 Jul - 12 Aug	Spirit Airlines
25 Jul - 01 Aug	Spirit Airlines
17 Jul - 25 Jul	Spirit Airlines
25 Jul - 01 Aug	Air France	direct
22 Jul - 04 Aug	Air France	direct
25 Jul - 28 Jul	Air France	direct

Also check the deals for one-way flights from Detroit to London 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 London in July from $737

Return flights