No one was injured when UA 5835 from Chicago was making a low-speed left turn after landing just before 2 a.m. ET.
Reports say 49 passengers were on the plane.
"The plane landed without incident but went off the runway while taxiing to the terminal," Jonathan Trudeau, the airport's director of communications, told CBC's Radio-Canada.
The Embraer 145 got stuck in a field at an intersection between two tracks and required assistance from emergency response teams to move it back onto the tarmac just before 6 a.m.
"The plane turned straight into the field, which was quite muddy from all the rain we've had," Trudeau said.
Airport operations were not seriously hampered by the incident and were returning to normal by 6:30 a.m.
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