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Delta Flight 4819’s landing seemed routine — until it wasn’t.

For the 80 people on board, the world lurched immediately after the wheels hit the ground at Toronto Pearson International Airport on Monday afternoon. The plane sparked and burst into flames as it skidded along the runway, then it rolled onto its back, its right wing shearing off.

In the blink of an eye, passengers found themselves hanging upside down, still strapped into their seats as jet fuel began running down the windows, said Pete Carlson, one of those on the flight.

“The absolute initial feeling is just, ‘Need to get out of this,’” Mr. Carlson told CBC, the Canadian national broadcaster.

But after a horrific string of fatal aviation accidents over the past two months, this crash proved different. The seatbelts passenger had strapped on to prepare for landing likely contributed to the lack of a more catastrophic outcome, aviation experts said. Flight attendants and passengers were able to help each other out of the emergency exits and onto the snow.

At least 18 people were injured, including one adult and one child in critical but non-life threatening condition, but everyone was expected to survive. By late Monday, some of the injured passengers had been released from the hospital, Delta said.

The crew of an air ambulance waiting to take off captured the moment of the crash-landing. The video, which spread on social media and was verified by The New York Times, may give clues about what caused the plane to tilt to its right before flipping onto its back. It shows the aircraft landing hard on a snow-covered runway and then flipping over on its right side amid black clouds of smoke.