AirHint found the following cheapest return flights from St. Louis (STL) to Madrid (MAD) in April 2026 (see full year).
Return flights
| 21 Apr - 28 Apr | Delta | ||
| 22 Apr - 29 Apr | Iberia | ||
| 12 Apr - 19 Apr | Iberia | ||
| 27 Apr - 04 May | Iberia | ||
| 17 Apr - 25 Apr | Delta | ||
| 07 Apr - 14 Apr | Iberia | ||
| 17 Apr - 24 Apr | Iberia | ||
| 02 Apr - 09 Apr | Iberia |
Also check the deals for one-way flights from St. Louis to Madrid in April.
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