U.S. Customs and Border Protection temporarily halted operations at Montréal-Trudeau International Airport on July 29, 2026, after detecting a strong odour that led to the cancellation of approximately 20 flights bound for the United States.
The disruption was first reported at 19:40 GMT on the same day. The suspension of customs processing directly affected U.S.-bound flights amid ongoing airport activity.
Cause of Disruption and Context
The source of the odour was traced to varnish fumes linked to painting work in the vicinity of the U.S. customs area. These materials are part of construction efforts associated with a $10-billion redevelopment project at Montréal-Trudeau Airport, which is
expected to continue for the next decade.
The presence of construction materials near passenger facilities reflects the airport’s significant infrastructure transformation underway.
Passenger Impact and Official Guidance
The suspension of U.S. customs operations caused cancellations affecting around 20 flights to the United States, disrupting travel plans for those passengers. Travelers were advised by airport officials to verify the status of their flights with airlines before traveling to Montréal-Trudeau Airport.
Officials warned that delays were likely to continue during the gradual resumption of customs services.
Official Response and Safety Confirmation
Montreal Fire Department conducted an inspection of the affected area and confirmed that the varnish odour posed no health risk. In
response, ventilation was increased in the U.S. customs area to dissipate the fumes.
Airport authorities emphasized that all efforts were underway to restore U.S. Customs and Border Protection operations as quickly as possible. They acknowledged the inconvenience caused and assured passengers that the suspension was temporary and safety was not compromised.
