Flight No. 957, which took off from Chicago Midway Airport, was diverted to Cleveland, Ohio, just before 11 a.m. - two hours after taking off, according to Flight View.
Those on the flight from Chicago to New Jersey told The Associated Press that passengers moved quickly away from the window after it cracked.
The incident comes after Jennifer Riordan, 43, died when the engine on a Dallas-bound Southwest plane exploded mid-air and smashed a window, nearly sucking her out of the aircraft.
Several passengers have shared pictures of a broken window on Twitter.
There are no reported injuries. In fact, for the first time since we've been tracking Southwest's Facebook likes, people have begun "Unliking" the airline's Facebook page, and after today's incident involving a cracked window, it isn't likely to reverse course any time soon. "That explosion caused one of the windows to explode in row 17 of the plane, which was just two aisles over from me".
Dallas-based Southwest said that the plane diverted for a maintenance review after the damage to one of the multiple layers of window pane.
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The airline has since ordered inspections of the engine model that failed on that flight, but a passenger has sued the airline, alleging post-traumatic stress disorder, anxiety, and depression.
The Cleveland landing also came a day after the crew of Southwest Flight 1380 was honored at the White House for its handling of the emergency.
The US Federal Aviation Administration is investigating the incident. The airline had previously opposed a recommendation by the engine's manufacturer to inspect the blades on their planes after metal fatigue was found to be the reason behind the engine failure and emergency landing of a Southwest plane in 2016.
The plane was taken out of service "for maintenance review".
Wells Fargo executive Jennifer Riordan, 43, died after she was partially sucked out of the broken window.