It's easy to get from Denver International Airport (DEN) to downtown Denver on the airport rail line. At a cost of $10.50 each way, travelers can use the A Line to get from the airport to downtown Denver and vice versa, courtesy of the Regional Transportation District (RTD), metro Denver's public transit provider.

As of early 2026, a one-way train ticket from Denver International Airport (DEN/DIA) to downtown (Union Station) on the RTD A Line costs $10.00. This "Airport Fare" includes unlimited transfers and travel across the entire RTD light rail and bus system for a single service day (until 2:59 AM the following morning). You can purchase these tickets at automated kiosks located on the train platform at the base of the Westin Hotel or via the RTD MyRide app on your smartphone. The journey takes approximately 37 minutes and trains depart every 15 minutes during peak hours. This $10 flat rate remains one of the most cost-effective "airport-to-city" links in the United States, especially compared to the $70–$90 average cost of a taxi or the variable "surge" pricing of rideshare apps like Uber or Lyft during busy arrival banks.

That depends on where you’re going! Denver International Airport (DIA) is served by the RTD A Line, a commuter rail that takes you directly to downtown Denver’s Union Station.

Here are the key details:

• Fare: $10.50 for a one-way ticket.
• What it covers: This is a Regional/Airport fare. It covers your entire trip on the A Line from the airport to Union Station (or vice-versa).
• Where to buy: You can purchase tickets at the station platforms using:
  • Ticket vending machines (cash or credit/debit).
  • The RTD MyTrip mobile app (highly recommended for convenience).
• Travel Time: The ride takes approximately 37 minutes from end to end.
• Frequency: Trains run every 15-30 minutes, depending on the time of day, from roughly 3:00 a.m. to 1:00 a.m.

Important Tips: 1. Validate Your Ticket: If you buy a paper ticket from a machine, you must tap it on the platform validator (a tall, silver pole with a purple top) before boarding. Tickets bought on the app are already “validated.” 2. To Other Destinations: If you need to transfer to another RTD bus or train after Union Station, you may need a different fare. The $10.50 Airport fare includes transfers within 3 hours. For the best fare and route planning for your final destination, use the RTD Trip Planner on their website or app. 3. Alternative: Rideshares (Uber/Lyft) and taxis are available but will be significantly more expensive ($35-$65+) to downtown Denver, depending on demand and traffic.

In short: For the direct train to downtown Denver (Union