Toronto Pearson and Montréal–Trudeau delays and cancellations affect 176 flights across Canada

Disruption overview

Canada’s busiest airports saw a fresh wave of disruption on 12 May 2026, with public flight-tracking data showing 25 cancellations and 151 delays by mid-afternoon. The heaviest impact was at Toronto Pearson International Airport and Montréal–Trudeau International Airport, though Vancouver, Calgary, and Edmonton were also affected. Air Canada and Jazz accounted for the biggest share of disrupted services, with WestJet, Air Transat, and Air Inuit also reporting problems. For many travelers, that meant long queues, missed connections, and fewer same-day rebooking options. Because the disruption appears to have been caused by a mix of weather constraints and wider operational pressure, compensation isn’t clear-cut, but passengers may still be entitled to care, rebooking, refunds, or other support depending on the reason for their flight’s disruption.

Disruption details

At least 176 flights were delayed or canceled across Canada’s main hubs on 12 May 2026, with the biggest disruption centered on Toronto Pearson International Airport (YYZ) and Montréal–Trudeau International Airport (YUL). For passengers, this meant a day of uncertainty as delays rolled through some of the country’s busiest connections.

By mid-afternoon, public flight-tracking data showed:

• At least 25 cancellations had been recorded.

• Another 151 delays were affecting departures and arrivals.

• Vancouver International Airport, Calgary International Airport, and Edmonton International Airport were also affected as disruption spread through connected domestic and trans-border routes.

Multiple carriers were caught up in the disruption. Air Canada and its regional affiliate Jazz accounted for the largest share of affected services, while WestJet, Air Transat, and Air Inuit also saw scattered cancellations and widespread late departures and arrivals.

Because several airlines were short of on-time capacity at the same time, same-day rebooking options on major routes quickly thinned out. If you were connecting through Toronto or Montréal, even a relatively small delay could turn into a missed onward flight, a longer wait at the airport, or an unexpected overnight stop.

The disruption did not appear to come from one single problem. A mix of localized weather constraints, especially on western routes, airspace congestion, and wider industry pressure left little room in the schedule. High jet-fuel prices, tight fleet utilization, and crew availability issues meant late inbound aircraft and minor flow-control measures could quickly snowball into more delays and a smaller number of cancellations.

That knock-on effect matters more at hubs like Toronto Pearson and Montréal–Trudeau because so many domestic and trans-border flights depend on tight turnarounds. Even though the total number of affected flights was only a fraction of Canada’s daily schedule, the disruption still changed travel plans for thousands of people.

As the day unfolded, travelers described long lines at service desks, crowded gate areas, and last-minute gate changes. When several airlines are dealing with the same pressure at once, those practical problems build quickly, even without a single dramatic trigger.

With summer travel approaching, high fuel costs and limited spare capacity could make this kind of volatility more common across busy Canadian networks.

If your flight was delayed or canceled, it’s worth checking exactly why your service was disrupted. Under Canada’s Air Passenger Protection Regulations, airlines may have to provide care and, in some cases, compensation when a delay or cancellation is within their control, but those obligations are narrower when weather or air traffic restrictions are involved.

Because this disruption appears to have involved a mix of weather and operational pressure, eligibility for cash compensation will depend on the reason recorded for your specific flight. Even so, you may still have rights around rebooking, refunds, and essential care, and AirHelp’s free flight checker can help you understand what may apply to your journey.

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