AirHint found the following cheapest one-way flights from St. Louis (STL) to Madrid (MAD) in May 2026 (see full year).
One-Way flights
| 09 May | Air Canada | ||
| 25 May | Aer Lingus | ||
| 31 May | British Airways | ||
| 24 May | Air Canada | ||
| 21 May | Iberia |
Also check the deals for return flights from St. Louis to Madrid in May.
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