AirHint found the following cheapest return flights from St. Louis (STL) to Montreal (YUL) in June 2026 (see full year).
Return flights
| 19 Jun - 25 Jun | Frontier Airlines | ||
| 01 Jun - 15 Jun | Delta | ||
| 14 Jun - 16 Jun | Air Canada | direct | |
| 15 Jun - 17 Jun | Air Canada | direct |
Also check the deals for one-way flights from St. Louis to Montreal in June.
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