AirHint found the following cheapest return flights from St. Louis (STL) to London (LGW) in July 2025 (see full year).

Return flights

12 Jul - 15 Aug	Frontier Airlines
30 Jul - 04 Aug	Spirit Airlines
07 Jul - 15 Jul	Spirit Airlines
05 Jul - 11 Jul	Frontier Airlines
14 Jul - 19 Jul	Spirit Airlines
15 Jul - 19 Jul	Frontier Airlines
15 Jul - 18 Jul	Frontier Airlines
05 Jul - 12 Jul	Frontier Airlines
29 Jul - 05 Aug	Air Canada
16 Jul - 26 Jul	Air Canada
06 Jul - 13 Jul	Frontier Airlines

Also check the deals for one-way flights from St. Louis 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 St. Louis to London in July from $832

Return flights