US storms disrupt 549 flights at Toronto, Calgary, and Montréal airports

Disruption overview

A wave of severe storms over the US Midwest and Northeast disrupted 549 flights across Toronto Pearson International Airport, Calgary International Airport, and Montréal–Trudeau International Airport on 3 April 2026. Canadian air-traffic control data showed 54 cancellations and 495 delays as blocked access to storm-hit US airports left aircraft stuck at Canadian gates, with Toronto Pearson hardest hit and knock-on effects reaching as far north as Puvirnituq. The disruption affected Air Canada, WestJet, Porter Airlines, Jazz Aviation, and Air Inuit. Because the cause was weather, compensation is unlikely, but affected passengers should still review rebooking or refund options and can use AirHelp’s free flight checker to better understand their rights.

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Disruption details

Severe storms over the US Midwest and Northeast disrupted 549 flights across Toronto Pearson International Airport, Calgary International Airport, and Montréal–Trudeau International Airport on 3 April 2026, choking the cross-border corridors Canadian airlines rely on.

For passengers, this meant long waits, missed connections, and thousands of people stranded across the country. What began as a weather problem over the United States quickly turned into a network-wide backlog in Canada as flights to and from major US airports stalled.

Canadian air-traffic control data showed how wide the disruption had become:

• 54 flights were canceled and 495 were delayed nationwide.

• Toronto Pearson recorded 17 cancellations and saw Canada–US routes grind to a halt.

• Calgary absorbed deep delays across WestJet’s western network.

• The aircraft backlog stretched as far north as Puvirnituq Airport.

Toronto Pearson was the main pressure point. Because aircraft could not get safe approach slots into storm-hit US airports such as Chicago and New York, jets remained parked at Canadian gates instead of turning around for their next flights. That blocked space for incoming domestic services and created a cascading knock-on effect across the system.

Calgary became the secondary failure point, while Montréal and, to a lesser extent, Ottawa saw severe ripple effects that displaced trans-Atlantic connections. What started as a cross-border disruption quickly spread well beyond the Canada–US market.

The disruption affected Air Canada, WestJet, Porter Airlines, Jazz Aviation, and Air Inuit. With key US destinations effectively inaccessible, some departures were suspended while others were heavily delayed, leaving passengers on aircraft or in terminals for hours while they waited for gate availability or revised departure slots.

Rebooking was also difficult. Available seats on major carriers were already exhausted, so travelers were urged to use call centers or mobile apps rather than queue at airport desks. Airlines also told passengers on Canada–US routes to watch US Customs and Border Protection preclearance hours closely. Once those facilities close, even an available aircraft and crew may not be able to depart, and a long delay can turn into a cancellation.

Because this disruption was driven by severe weather, compensation is unlikely. Under Canada’s passenger rights rules, airlines generally do not have to pay financial compensation or provide hotel accommodation when delays or cancellations are caused solely by meteorological conditions, even if the bad weather is on the US side of the border.

Still, that does not mean you have no options. It’s worth checking your rebooking or refund choices, following updates from your airline closely, and keeping an eye on preclearance timing if you’re flying to the United States. If you want to better understand what may apply to your specific flight, AirHelp’s free flight checker is a simple place to start.

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