All three men worked for a company contracted by Frontier Airlines to clean the planes.
Two workers were arguing about a light switch in the breakroom of Terminal E, Philadelphia Police Lt. John Walker told NBC 10. The alleged perpetrator, 35, is in police custody. After a few shoves, the third man sliced one of the others with a knife in the stomach.
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The stabbing victim was taken to a local trauma center where he was pronounced dead.
No passengers were involved or harmed, FOX 43 reported.
In a statement, Frontier Airlines said: "We've been made aware of an incident involving employees of Worldwide Flight Services (WFS) at Philadelphia International Airport". We have reached out to WFS to assist them in any way possible as they deal with this incident.