
Getting to Denver International Airport (DIA) by train is a convenient and efficient option for travelers, thanks to the Regional Transportation District’s (RTD) A Line commuter rail service. The A Line connects Denver Union Station in downtown Denver directly to the airport, with trains departing approximately every 15 minutes during peak hours and every 30 minutes during off-peak times. The journey takes about 37 minutes, offering a stress-free alternative to driving or taking a taxi. Passengers can easily access Union Station via public transit, rideshare, or by parking at the station, making it a seamless option for both locals and visitors. Additionally, the A Line operates daily from early morning until late at night, ensuring accessibility for most flight schedules.
| Characteristics | Values |
|---|---|
| Train Service | RTD A Line (University of Colorado A Line) |
| Departure Station | Union Station (Downtown Denver) |
| Arrival Station | Denver Airport Station (DEN) |
| Travel Time | Approximately 37 minutes |
| Frequency | Every 15 minutes during peak hours, every 30 minutes during off-peak hours |
| Operating Hours | Daily, from approximately 3:30 AM to 1:00 AM |
| Fare (One-Way) | $10.50 (as of latest data) |
| Payment Methods | Cash, credit/debit card, RTD MyRide card, mobile ticketing |
| Luggage Policy | Allowed, but must not block aisles or doors |
| Accessibility | Fully ADA-accessible trains and stations |
| Connections | Connects to other RTD bus and rail lines at Union Station |
| Additional Services | Free Wi-Fi on trains, real-time arrival information |
| Parking at Union Station | Available, fees apply |
| Website for Updates | RTD Denver |
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What You'll Learn
- Light Rail Options: RTD A Line connects downtown Denver to the airport in under 40 minutes
- Ticket Purchase: Buy tickets at stations, online, or via RTD’s mobile app for convenience
- Schedule & Frequency: Trains run every 15 minutes during peak hours, less frequently late at night
- Station Locations: Union Station is the main hub; other stops include 40th & Colorado
- Luggage & Accessibility: Trains are luggage-friendly and ADA-accessible for all travelers

Light Rail Options: RTD A Line connects downtown Denver to the airport in under 40 minutes
The Regional Transportation District's (RTD) A Line is a game-changer for travelers seeking a seamless and efficient journey to Denver International Airport (DIA). This light rail service offers a direct connection from Denver's Union Station to the airport, covering a distance of approximately 23 miles in under 40 minutes. For those navigating the city, this option stands out as a time-saving alternative to road travel, especially during peak traffic hours.
From a logistical standpoint, the RTD A Line operates with impressive frequency. Trains depart every 15 minutes during peak times and every 30 minutes during off-peak hours, ensuring that passengers can plan their trips with minimal waiting. The service runs from early morning until late at night, accommodating both early bird and night owl travelers. To utilize this service, passengers should purchase a ticket at Union Station or use the RTD Mobile Ticketing App, which offers convenience and often a slight discount. The fare is structured based on zones, with the airport being in the highest fare zone, so expect to pay around $10.50 for a one-way trip.
One of the most compelling aspects of the RTD A Line is its integration with other public transportation systems. Union Station serves as a major hub, connecting light rail, commuter rail, and bus services. This makes it an ideal starting point for travelers coming from various parts of the city or even from neighboring regions. For instance, if you're arriving in Denver via Amtrak, you can seamlessly transfer to the A Line without needing additional transportation. This interconnectedness not only simplifies travel but also reduces the carbon footprint associated with airport journeys.
However, it's essential to plan for potential delays, especially during adverse weather conditions. While the A Line is generally reliable, snowstorms or severe weather can impact its schedule. Travelers should check the RTD website or app for real-time updates before heading to the station. Additionally, consider arriving at Union Station with ample time to spare, particularly if you're catching an early flight. The walk from the station platform to the train can take a few minutes, and you’ll want to account for any unexpected delays.
In comparison to other airport transportation options, the RTD A Line offers a balance of speed, cost, and convenience. While ride-sharing services like Uber or Lyft may provide door-to-door service, they are often more expensive and subject to traffic congestion. Similarly, driving yourself requires navigating parking fees and the stress of airport traffic. The A Line eliminates these concerns, providing a fixed cost and a predictable travel time. For environmentally conscious travelers, this option aligns with sustainable travel practices, further enhancing its appeal.
In conclusion, the RTD A Line is a standout choice for reaching Denver International Airport by train. Its efficiency, affordability, and integration with other transit systems make it a practical and eco-friendly option. By planning ahead and staying informed, travelers can maximize the benefits of this service, ensuring a smooth start or end to their journey. Whether you're a frequent flyer or a first-time visitor, the A Line simplifies airport travel, setting a high standard for public transportation connectivity.
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Ticket Purchase: Buy tickets at stations, online, or via RTD’s mobile app for convenience
Purchasing tickets for your train journey to Denver Airport is a straightforward process, offering multiple options to suit different preferences and needs. Whether you're a tech-savvy traveler or prefer traditional methods, the Regional Transportation District (RTD) provides a range of convenient ways to secure your fare.
Online Booking: A Click Away
For those who plan ahead, buying tickets online is a popular choice. The RTD website allows you to purchase tickets for the A Line, which connects downtown Denver to the airport. Simply select your departure and arrival stations, choose your ticket type (one-way or round-trip), and proceed to payment. This method is ideal for travelers who want to guarantee their seat and avoid potential lines at the station. Online booking also provides the advantage of receiving an e-ticket, which can be stored on your phone, eliminating the need for physical tickets.
Mobile App: Travel Companion in Your Pocket
The RTD Mobile Tickets app is a game-changer for frequent commuters and last-minute travelers. Available for both iOS and Android, this app lets you purchase tickets on the go. With just a few taps, you can buy a single ride or a day pass, making it perfect for spontaneous trips. The app also offers real-time train schedules and service alerts, ensuring you stay informed about any delays or disruptions. This digital approach not only saves time but also reduces the environmental impact by minimizing paper waste.
Station Purchase: Traditional yet Reliable
If you prefer a more conventional approach or find yourself without internet access, buying tickets at the station is always an option. Ticket vending machines are located at all A Line stations, including Union Station and Denver Airport Station. These machines accept cash and major credit cards, providing a quick and easy way to purchase your fare. It's worth noting that machines may have specific instructions, so take a moment to read the on-screen prompts carefully. This method is particularly useful for travelers who prefer a tangible ticket and want to avoid potential online booking fees.
When considering ticket purchase options, it's essential to plan according to your travel style. Online and mobile app bookings offer convenience and time-saving benefits, especially during peak travel seasons. However, for those who value simplicity and prefer a more hands-on approach, station purchases remain a reliable choice. Regardless of the method, RTD ensures that getting your ticket is a seamless part of your journey to Denver Airport.
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Schedule & Frequency: Trains run every 15 minutes during peak hours, less frequently late at night
Traveling to Denver International Airport by train is a convenient option, especially when you understand the schedule and frequency of the service. Trains operate every 15 minutes during peak hours, ensuring that you can easily catch a ride without long waits. This frequent service is ideal for commuters and travelers alike, providing flexibility and reliability during the busiest times of the day. Peak hours typically align with morning and evening rush periods, so plan accordingly if you’re aiming for a seamless journey.
Late at night, the train frequency decreases, which is a common adjustment in public transit systems to match lower demand. While this means you’ll need to check the schedule more carefully, it’s still a viable option for late arrivals or early departures. For instance, trains might run every 30 minutes after 10 PM, so allow extra time to avoid missing your ride. Pro tip: Use the official transit app or website to get real-time updates, especially during off-peak hours, to ensure you’re not left waiting in the dark—literally.
Comparing this schedule to other airport transit options, the train’s frequency during peak hours outshines many shuttle or bus services, which often run less often. However, late-night travelers might find taxis or rideshares more readily available if time is a critical factor. The trade-off is cost: trains are generally more affordable, making them a budget-friendly choice for those who can align their schedule with the service frequency.
For practical planning, consider your flight time and factor in the train schedule. If you’re traveling during peak hours, arriving at the station 10–15 minutes early is sufficient. Late at night, aim for 20–25 minutes to account for reduced frequency and potential delays. Additionally, check for any scheduled maintenance or service disruptions, as these can temporarily alter the usual timetable. By aligning your travel plans with the train’s schedule, you can make your journey to Denver Airport smooth and stress-free.
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Station Locations: Union Station is the main hub; other stops include 40th & Colorado
Denver's train system offers a seamless connection to Denver International Airport (DEN), with Union Station serving as the central hub for travelers. This historic transportation center, located in the heart of downtown Denver, is not just a gateway to the airport but also a vibrant urban space with shops, restaurants, and cultural attractions. From Union Station, the University of Colorado A Line provides direct service to DEN, making it the most convenient starting point for train travel to the airport.
Beyond Union Station, the A Line includes strategic stops that cater to a broader range of passengers. One notable stop is 40th & Colorado Station, situated in the bustling North Denver area. This station is particularly useful for residents and visitors staying in nearby neighborhoods, offering easy access to the airport without the need to travel through downtown. Its location also serves as a practical alternative for those looking to avoid the often congested routes leading to Union Station during peak hours.
For travelers, understanding the station locations is key to planning an efficient journey. Union Station’s centrality makes it ideal for those already in downtown Denver or arriving via Amtrak. Meanwhile, 40th & Colorado Station provides a more localized option, reducing travel time for those in the northern part of the city. Both stations are equipped with amenities like parking, bike storage, and connections to local bus routes, ensuring flexibility for all types of travelers.
A practical tip for passengers is to check the RTD (Regional Transportation District) schedule in advance, as train frequencies vary by time of day. During early mornings or late nights, service may be less frequent, so planning accordingly can prevent unnecessary delays. Additionally, purchasing tickets ahead of time through the RTD app or at station kiosks can save time and ensure a smoother boarding process.
In summary, the A Line’s station locations—with Union Station as the main hub and 40th & Colorado as a key secondary stop—offer travelers flexibility and convenience when heading to Denver Airport. By choosing the right station based on your starting point, you can streamline your journey and enjoy a stress-free travel experience. Whether you’re a local or a visitor, these stations provide accessible and efficient connections to one of the busiest airports in the country.
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Luggage & Accessibility: Trains are luggage-friendly and ADA-accessible for all travelers
Traveling to Denver International Airport by train offers a seamless experience, especially when it comes to managing luggage and ensuring accessibility. Unlike air travel, where baggage restrictions and fees can be a hassle, trains provide ample space for your belongings. Most regional and commuter trains, including those serving Denver, feature designated luggage racks and storage areas, allowing you to keep your bags within sight and easily accessible. This eliminates the stress of checking luggage or worrying about overhead bin space, making your journey smoother from start to finish.
For travelers with disabilities, trains are a reliable and inclusive option. The Americans with Disabilities Act (ADA) mandates that public transportation systems, including trains, be fully accessible. Denver’s light rail system, operated by the Regional Transportation District (RTD), complies with these standards, offering features like low-floor vehicles, priority seating, and wheelchair ramps or lifts. Additionally, stations along the route to the airport are equipped with elevators, tactile paving, and clear signage to assist passengers with visual or mobility impairments. If you require further assistance, RTD provides a paratransit service, Access-a-Ride, which can be booked in advance for door-to-door transportation.
When planning your trip, consider the A Line, Denver’s direct rail link to the airport. This 23-mile route connects downtown Denver to DIA in approximately 40 minutes, with trains departing every 15 minutes during peak hours. Each train car has dedicated spaces for wheelchairs and large luggage, ensuring comfort for all passengers. For added convenience, the A Line operates daily from 3:30 a.m. to 12:30 a.m., accommodating early morning or late-night flights. Fares are affordable, with a one-way ticket costing around $10.50, and discounts available for seniors, children, and individuals with disabilities.
To make the most of your train journey, pack smartly. While trains are luggage-friendly, bulky or oversized items can still pose challenges. Use suitcases with wheels for easy maneuverability, and secure loose straps to prevent tripping hazards. If you’re traveling with multiple bags, consider using luggage carts available at stations for a small fee. For accessibility needs, contact RTD ahead of time to ensure any specific accommodations are in place. This proactive approach ensures a stress-free experience, allowing you to focus on enjoying the scenic ride to Denver International Airport.
In comparison to other modes of transportation, trains stand out for their balance of convenience and inclusivity. Unlike rideshares or shuttles, which may have limited space for luggage or accessibility features, trains are designed to cater to diverse traveler needs. The combination of ample storage, ADA compliance, and affordable pricing makes taking the train to Denver Airport an attractive option for all types of travelers. Whether you’re a solo adventurer, a family with young children, or a passenger with mobility challenges, the train system is equipped to handle your journey with ease and dignity.
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Frequently asked questions
Yes, the University of Colorado A Line provides direct rail service from Denver Union Station to Denver International Airport. The journey takes approximately 37 minutes.
The University of Colorado A Line operates frequently, with trains departing every 15 minutes during peak hours and every 30 minutes during off-peak times, including weekends and late nights.
A one-way ticket on the University of Colorado A Line costs $10.50. Discounted fares are available for seniors, children, and disabled passengers. Tickets can be purchased at vending machines or via the RTD Mobile Ticketing App.











































