On Wednesday, July 29, 2026, U.S. Customs and Border Protection (USCBP) temporarily halted operations at Montréal-Trudeau International Airport, leading to the cancellation of around 20 flights bound for the United States.
Cause of Suspension and Health Assessment
The disruption was triggered by a strong odour of varnish related to painting and construction materials near customs processing areas. In response, the Montreal Fire Department inspected the site and confirmed that the odour posed no health risk. Airport authorities increased ventilation in the affected zones to alleviate the situation.
Flight Cancellations and Passenger Guidance
Approximately 20 U.S.-bound flights were cancelled due to the customs suspension. Passengers scheduled to travel to the United States
from Montréal-Trudeau Airport were advised to verify their flight status with their respective airlines before departing for the airport. Additionally, travelers were warned to anticipate delays as USCBP operations resumed gradually following the suspension.
Official Statements and Information Access
Airport officials stated that efforts are ongoing to restore U.S. Customs processing as quickly as possible. While acknowledging the unpleasant odour, they emphasized it did not present health risks and expressed gratitude for passengers’ patience. USCBP encouraged travelers with questions about U.S. preclearance operations to contact them directly for further information.
Officials reiterated that passengers should check flight details with their airlines to avoid unexpected disruptions.
Ongoing Redevelopment Project at Montréal-Trudeau Airport
The incident occurred amid a $10-billion redevelopment project at Montréal-Trudeau International Airport. The airport is undergoing one of the most significant infrastructure transformations in its history, with extensive construction activities expected to continue throughout the next decade.
The varnish odour causing the disruption was linked to this ongoing large-scale redevelopment work.
