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

Return flights

14 Apr - 21 Apr	Air Canada
15 Apr - 22 Apr	Lufthansa
13 Apr - 20 Apr	Air Canada
19 Apr - 28 Apr	Delta
11 Apr - 18 Apr	Air Canada
22 Apr - 27 May	Delta
22 Apr - 28 May	Delta
22 Apr - 29 May	Delta
10 Apr - 17 Apr	Lufthansa
22 Apr - 30 May	Delta
19 Apr - 29 Apr	Lufthansa
06 Apr - 12 Apr	Frontier Airlines
23 Apr - 27 May	Alaska Airlines
22 Apr - 31 May	Lufthansa
09 Apr - 16 Apr	Air Canada
12 Apr - 19 Apr	Air Canada

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

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 April from 485€

Return flights