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

Return flights

23 Jan - 29 Jan	Frontier Airlines
12 Jan - 17 Jan	Frontier Airlines
06 Jan - 10 Jan	Frontier Airlines
05 Jan - 31 Jan	Frontier Airlines
21 Jan - 14 Feb	Lufthansa
23 Jan - 14 Feb	Air Canada

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.

Book a cheap hotel in London

Cheap car rent in London

Cheapest return flights from St. Louis to London in January from $408

Return flights