Delta Flight 834 had taken off from New York's LaGuardia Airport just after 8 p.m. Thursday.
Officials tell Action News the plane was diverted because of an electrical problem.
Chopper 6 was over Philadelphia International Airport as the plane safely landed.
Delta plane bound for LaGuardia makes emergency landing in Philadelphia
Delta brought in a different plane that left Philadelphia at 2:15 a.m.
It landed in Denver at 6 a.m.
No injuries were reported.