Denver Airport is a commuter rail station on the A Line in Denver, Colorado, serving Denver International Airport. The A Line begins at the airport and travels west to Union Station in Downtown Denver in about 27 minutes via six intermediate stops. Trains run about every 15 minutes.

The A Line is a Regional Transportation District (RTD) commuter rail line serving Denver and Aurora, Colorado, operating between downtown Denver and Denver International Airport (DIA). During planning and construction, it was also known as the East Rail Line, but most locals refer to it as the A Line. Despite its former title, the line does not serve the campuses of the University of Colorado.