AirHint found the following cheapest one-way flights from St. Louis (STL) to Frankfurt (FRA) in May 2026 (see full year).
One-Way flights
| 24 May | Aer Lingus | ||
| 31 May | Aer Lingus | ||
| 23 May | Aer Lingus | ||
| 01 May | Alaska Airlines | ||
| 01 May | United | direct | |
| 31 May | Lufthansa | direct | |
| 24 May | Lufthansa | direct | |
| 22 May | Air Canada |
Also check the deals for return flights from St. Louis to Frankfurt in May.
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