AirHint found the following cheapest return flights from St. Louis (STL) to Basel (BSL) in March 2026 (see full year).
Return flights
| 18 Mar - 30 Mar | Delta | ||
| 19 Mar - 29 Mar | British Airways | ||
| 18 Mar - 29 Mar | Lufthansa | ||
| 20 Mar - 29 Mar | Lufthansa |
Also check the deals for one-way flights from St. Louis to Basel in March.
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