All Direct Transfer Routes From Denver International Airport (DEN)
DEN
37 min
The #1 recommended option is the RTD A-Line commuter rail, departing right under the Westin Hotel at the south terminal exit directly to Denver Union Station in 37 minutes for $10.00 USD. The ticket includes a full day pass across the entire RTD transit network (youth 19 and under ride free). Taxis and Uber/Lyft cost $55–$75 USD and take 40–60 minutes depending on I-70 traffic.
DEN
55 min
The premier transit option is the RTD Route AB1 Express Bus, departing hourly from the DEN transit center directly to Downtown Boulder (14th & Walnut) in 65–75 minutes for only $10.00 USD. An Uber or Lyft to Boulder costs $75–$110 USD, taking 50–70 minutes via the E-470 toll highway or US-36.
Terminals & Station Layout
DEN features the iconic tent-roof Jeppesen Terminal with Level 5 (baggage claim & ground transport) and Level 6 (ticketing/check-in). Three airside concourses (A, B, C) are linked via the automated underground train system. The Westin Denver International Airport hotel sits right above the transit center.
Taxi Rules & Scams to Avoid
Watch out for aggressive private shuttle touts on Level 5 claiming train delays. The RTD A-Line train station is located directly under the Westin Hotel on the south end of Jeppesen Terminal with automated ticket machines.
Late-Night Arrivals (After Midnight)
The RTD A-Line train operates nearly 24/7 (trains run every 15–30 minutes from 03:30 AM to 01:00 AM). Between 01:00 and 03:30 AM, use Uber/Lyft (pick up on Level 5, Island 5) or official curbside metered taxis.
STRESS-FREE DOOR-TO-DOOR OPTION
Prefer a Driver Waiting at Denver (DEN) Arrivals?
Traveling with heavy suitcases, young children, or landing after midnight? Pre-book a fixed-price private airport transfer or express rail pass on Klook with instant confirmation and no meter haggling.
ARRIVAL CONNECTIVITY & RIDE-HAILING TIP
Need Mobile Data at the Terminal for Uber / Lyft & Maps?
Airport Wi-Fi often drops outside the terminal curb where Uber / Lyft pickup zones are located. Install a local eSIM before your flight so you can order a ride, translate station signs, and show digital train QR tickets immediately after landing.