Cheapest return flights from St. Louis to London in April from $652

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

Return flights

22 Apr - 28 Apr Air Canada
01 Apr - 22 Apr Delta
22 Apr - 20 May United
22 Apr - 28 Apr British Airways direct
19 Apr - 03 May Air Canada
04 Apr - 17 Apr United
10 Apr - 21 Apr Air Canada
10 Apr - 24 Apr United
10 Apr - 17 Apr United
16 Apr - 25 Apr Finnair

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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