U.S. Customs and Border Protection temporarily stopped operations at Montréal-Trudeau International Airport on July 29, 2026, resulting in the cancellation of approximately 20 flights bound for the United States. The halt was triggered by a strong odour emanating from varnish related to painting work on nearby construction materials.
Odour Cause and Safety Measures
Operations were suspended due to the persistent smell in the customs processing area. The airport increased ventilation in the affected zone to dissipate the odour. The Montreal Fire Department conducted an inspection and confirmed that the odour did not present any health hazards to staff or passengers.
Flight Disruptions and Passenger Guidance
The suspension of U.S. Customs
operations disrupted the processing of U.S.-bound travelers, leading to multiple flight cancellations. Passengers scheduled for flights to the United States are being advised to verify their flight status directly with airlines before departing for Montréal-Trudeau Airport, as additional delays and cancellations remain possible during the ongoing gradual resumption of customs services.
Official Response and Redevelopment Context
Montreal-Trudeau Airport officials stated efforts are underway to restore U.S. Customs operations as swiftly as possible, and apologized for the inconvenience caused. The airport’s statement clarified that while the odour was unpleasant, it posed no health risks. This incident occurs amid a $10-billion redevelopment project at Montréal-Trudeau, representing one
of the largest infrastructure transformations in the airport’s history with substantial construction continuing over the coming decade.
