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

Return flights

08 Oct - 15 Oct	Air Canada
21 Oct - 28 Oct	British Airways
29 Oct - 05 Nov	British Airways
02 Oct - 07 Oct	Delta
23 Oct - 30 Oct	British Airways
27 Oct - 03 Nov	British Airways
19 Oct - 26 Oct	British Airways
03 Oct - 10 Oct	Delta
18 Oct - 26 Oct	British Airways
30 Oct - 03 Nov	Air Canada
03 Oct - 06 Oct	Air Canada
30 Oct - 02 Nov	Delta
23 Oct - 03 Nov	Delta
25 Oct - 01 Nov	British Airways
02 Oct - 05 Oct	British Airways
15 Oct - 21 Oct	American Airlines

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

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 October from $521

Return flights