It happened around 3:00 a.m. near 10th and Filbert streets.
Police tell Action News that three or four males dressed in black and wearing ski masks entered through the employee garage.
They forced four employees into a storage room, before fleeing with the cash.
At least one man was armed with a gun but no shots were fired.
Investigators are interviewing employees and customers inside the terminal for more information.
So far no arrests have been made.
