Cheapest return flights from St. Louis to London in April from $657

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

Return flights

19 Apr - 29 Apr Delta
22 Apr - 26 Apr Air Canada
02 Apr - 30 Apr Air Canada
15 Apr - 19 Apr Finnair
22 Apr - 27 May Air Canada
10 Apr - 20 Apr Air Canada
18 Apr - 22 Apr Air Canada
20 Apr - 24 Apr Aer Lingus
22 Apr - 26 Apr Aer Lingus direct
19 Apr - 29 Apr Aer Lingus direct

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

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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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