The Delta Airbus A321 departed Salt Lake City and was cruising at 35,000 feet around 3 p.m. when pilots noticed rising temperatures in the cargo area. The aircraft was diverted to Cheyenne Regional Airport and evacuated.
Firefighters checked the plane and found no fire.
None of the more than 200 passengers onboard were injured. They were allowed to reboard and collect their things.
The airline brought in a new plane to resume the trip to Detroit.
The Associated Press contributed to this report.