AirHint found the following cheapest return flights from St. Louis (STL) to Brussels (BRU) in March 2026 (see full year).
Return flights
| 20 Mar - 30 Apr | Delta | ||
| 20 Mar - 28 Mar | Delta | ||
| 21 Mar - 29 Mar | Lufthansa | ||
| 07 Mar - 13 Mar | Frontier Airlines | ||
| 13 Mar - 29 Mar | Delta |
Also check the deals for one-way flights from St. Louis to Brussels in March.
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