The crash occurred on a ramp to Terminal 5 at the airport at about 2:30 a.m. The bus appeared to crash into a median, with the bus having heavy damage to its front.
CFD responded to the scene and found the driver, who was ejected from the crash. He was transported to Lutheran General Hospital in critical condition, CFD said. He later died.
While the Cook County coroner confirmed the death, no cause of death has been announced and the driver has not been identified.
Several lanes were closed at the terminal, which remained accessible for travelers. The crash involved an airport shuttle bus and is not impacting CTA service.
Further details on the crash were not immediately available.