🔥 Trending Montreal-Trudeau Airport Operations Resume After Suspicious Odor Incident

U.S. Customs Operations Disrupted by Odour at Montreal-Trudeau Airport

On Wednesday, July 29, 2026, operations at Montreal-Trudeau International Airport (YUL) were significantly disrupted when U.S. Customs and Border Protection (CBP) temporarily suspended its preclearance services due to a strong odour ¹⁴⁵. This suspension led to numerous flight cancellations and delays for passengers traveling from Montreal to the United States ⁴⁷.

Cause of the Disruption

The primary cause of the disruption was identified as a strong odour originating from construction materials within the U.S. Customs and Border Protection area of the airport ²⁹¹⁰. Passengers reported an "exhaust smell" ¹⁵. The airport confirmed that the smell was linked to ongoing construction activities ¹⁰. Montreal-Trudeau Airport is currently undergoing a significant 10-year, $10 billion infrastructure modernization program, often referred to as "the airport of tomorrow," aimed at increasing traveler volume and supporting future growth ⁸.

Impact on Flights and Passengers

The temporary halt in U.S. customs operations resulted in the cancellation or delay of many flights bound for the United States ⁴⁵. Approximately 20 flights from Montreal to the U.S. were cancelled as a direct consequence of the odour ⁷. This situation caused inconvenience and uncertainty for travelers planning to fly south of the border ².

Resumption of Services

U.S. Customs and Border Protection began gradually resuming its operations later on Wednesday morning ¹³. Flights to the United States were expected to progressively restart as customs officers returned to their duties in the preclearance area ³. This allowed the airport to begin clearing the backlog of affected flights and passengers.