Updated August 26, 2026 · Practical planning guide
Denver International Airport (DEN) connects to downtown Denver by rail and road. The right choice depends on whether Denver is the destination or the starting point for a mountain or national-park road trip.
The A Line connects DEN with Union Station
Denver’s airport rail service connects the airport with Denver Union Station. Check current RTD service, fare and operating information for the travel date before relying on the train.
Downtown hotel location matters
A hotel near Union Station may make rail especially convenient. A hotel farther away can add another local transit or rideshare leg, so compare the complete door-to-door route.
A rental car makes sense only if you will use it
Travelers heading toward Rocky Mountain destinations or other road-trip stops may need a car. Include hotel parking, fuel, tolls where applicable and the number of days the vehicle will actually move.
Weather can change the mountain plan
Colorado mountain driving conditions can differ sharply from conditions at DEN or downtown. Check official road and weather information before committing to a route outside the metro area.
Return timing deserves its own plan
Rail schedules, rental-car return and security time all affect the departure morning. Build the return trip backward from the airline’s check-in and boarding requirements.
Before you book
- Confirm DEN and the hotel location.
- Check the A Line for the current travel window.
- Price parking before renting a car.
- Check mountain road conditions if leaving the metro area.
- Build the airport return around the flight departure time.
Plan it in three steps
Answer the planning question first, then move into current comparison pages when you are ready.
Related planning pages
Continue from planning to comparison
Use the category that matches the next part of this trip. Review current availability, final prices and provider terms before booking.
Explore all travel services →