AirHint found the following cheapest return flights from St. Louis (STL) to Barcelona (BCN) in May 2026 (see full year).
Return flights
| 10 May - 17 May | United | ||
| 11 May - 21 May | Air Canada | ||
| 17 May - 24 May | United | ||
| 24 May - 31 May | United | ||
| 29 May - 08 Jun | Condor |
Also check the deals for one-way flights from St. Louis to Barcelona in May.
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