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

Return flights

15 Oct - 21 Oct	Air Canada
07 Oct - 14 Oct	Air France
22 Oct - 29 Oct	Air France
29 Oct - 05 Nov	British Airways
14 Oct - 21 Oct	British Airways
16 Oct - 21 Oct	Air Canada
09 Oct - 30 Oct	Delta
17 Oct - 24 Oct	British Airways
20 Oct - 27 Oct	British Airways
23 Oct - 30 Oct	British Airways
02 Oct - 09 Oct	British Airways
26 Oct - 02 Nov	British Airways

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 $510

Return flights