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 | ||
| 19 Apr - 28 Apr | Delta | ||
| 02 Apr - 30 Apr | Iberia | ||
| 02 Apr - 16 Apr | Delta | ||
| 03 Apr - 16 Apr | Delta | ||
| 22 Apr - 27 May | Air Canada | ||
| 06 Apr - 12 Apr | United |
Also check the deals for one-way flights from St. Louis to London in April.
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