Cheapest return flights from St. Louis to London in October from $640

AirHint found the following cheapest return flights from St. Louis (STL) to London (LHR) in October 2026 (see full year).

Return flights

13 Oct - 21 Oct Air Canada
13 Oct - 21 Oct British Airways direct

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

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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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