U.S. customs operations at Montreal airport suspended due to strong odour from construction materials, leading to flight cancellations.
John GradekUmar ChaudryAbraham WexlerU.S. Customs and Border ProtectionMontreal airport authorityAéroport de MontréalAéroports de MontréalMontreal-Trudeau International Airport

U.S. customs operations at Montreal airport suspended due to strong odour from construction materials, leading to flight cancellations.

U.S. Customs and Border Protection suspended operations at Montreal-Trudeau International Airport Wednesday due to a strong odour from construction materials, leading to the cancellation of around 20 flights bound for the United States, including those to Washington and Chicago, as authorities work to resolve the issue.

MTL Blog+6 sources29 July 2026 · 14:56 UTC
CuriousCats Full Story

U.S. Customs and Border Protection (USCBP) suspended operations at Montreal-Trudeau International Airport Wednesday morning due to a strong odour linked to construction materials, resulting in the cancellation of approximately 20 flights to the United States.1

The airport authority confirmed that the smell prompted the suspension, with flights to major cities like Washington National and Chicago O'Hare affected. An airport spokesperson stated, "Every effort is being made to resume operations as quickly as possible," but no specific timeline has been provided for when U.S.-bound screening will resume.3

The Montreal fire department inspected the area and determined that the situation posed no health risk. Passengers were advised to check their flight status before heading to the airport. "The lines are not moving in there at all," said passenger Umar Chaudry, expressing frustration over the lack of information.5

The airport is undergoing a $10-billion transformation, which includes significant construction work. John Gradek, an aviation expert, described the incident as an "industrial accident", emphasizing the need for safety protocols in such situations.7

As operations remain suspended, travelers are left in uncertainty, with many flights already cancelled or delayed.

Key Insight
“Around 20 U.S.-bound flights have been cancelled as U.S. Customs and Border Protection temporarily halted operations due to a smell linked to interior painting work. The Montreal fire department inspected the area and confirmed that the situation does not pose a health risk, while the airport is working to resume normal operations.”
CuriousCats studied:
1
MTL Blog
“According to a notice posted directly on YUL's website, USCBP paused activities Wednesday morning because of the smell.”
MTL Blog →
2
PAXnews.comPAXnews.com
“U.S.-bound flights from Montréal-Pierre Elliott Trudeau International Airport were cancelled Wednesday morning (July 29) after an odour was reported in the U.S. Customs and Border Protection (USCBP) area.”
PAXnews.com →
3
CP24CP24
“Flights to the United States have been cancelled from Montréal-Pierre Elliott Trudeau International Airport due to an “odour” in the U.S. Customs and Border Protection area, Wednesday, July 29, 2026.”
CP24 →
4
CTV News
“Flights to the United States have been cancelled from Montréal-Pierre Elliott Trudeau International Airport due to an “odour” in the U.S. Customs and Border Protection area, Wednesday, July 29, 2026.”
CTV News →
5
CBC
“U.S. Customs and Border Protection is suspending its operations at the Montréal-Trudeau International Airport, leading to multiple flight cancellations Wednesday.”
CBC →
6
CityNews Montreal
“U.S. Customs operations at Montreal-Trudeau International Airport were temporarily suspended Wednesday morning after an odour was detected, causing many flights heading south of the border to be cancelled or delayed.”
CityNews Montreal →
7
Toronto Star
“Montreal-Trudeau International Airport says several flights to the United States were cancelled after U.S. customs authorities temporarily suspended their operations at the airport.”
Toronto Star →
Ask CuriousCats
What caused the suspension of customs operations?
Who confirmed there is no health risk?
How many flights were canceled at the airport?
Are other airports facing similar disruptions?
How does this incident compare to past airport closures?
Become the most informed
person in the room.
Personal AI agents scanning 100,000+ sources — news, video, and social media — delivered every morning.
Download the App Go to CuriousCats.ai
🇺🇸 US🇮🇳 India🇬🇧 UK🇨🇦 Canada🇸🇬 Singapore
If you liked this, you’ll love your CuriousCats brief.
News, videos, opinions and more — without the noise.
Get CuriousCats