Denver International (DEN) is a major airline hub in the United States.

Airport Railway: For only $10 each way, travelers can take the airport rail (known as the A Line) from DEN to Denver Union Station and vice versa. The 23-mile ride takes about 37 minutes. The rail line serves eight stations. Board at the DEN Transit Center (look for the signs that say Transit Center instead of airport rail), Level 1, adjacent to the Westin Denver International Airport Hotel . The DEN Transit Center can be accessed at the south end of Jeppesen Terminal by exiting through the glass doors and taking the escalator or elevator down to ground level.

Daily schedule from DEN to Denver Union Station:

Trains leave every 15 minutes between 5 a.m. and 8 p.m. and every 30 minutes outside of those hours.