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

Return flights

19 Jan - 28 Jan	Lufthansa
10 Jan - 24 Jan	Lufthansa
16 Jan - 22 Jan	Air Canada
01 Jan - 11 Jan	Lufthansa
02 Jan - 07 Jan	Lufthansa
18 Jan - 20 Jan	British Airways

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

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 January from $591

Return flights