AB Bus Schedule: All Routes, Map, Stops, Airport Fare & Live Times
The AB bus schedule usually points to RTD’s Boulder / Denver Airport route family: AB1, AB2 and AB3. This guide helps riders choose the right AB route, check the official RTD schedule, use Next Ride live tracking, find Boulder and DEN Transit Center stops, understand airport fare rules, compare AB1 vs AB2 vs AB3, and avoid the common airport-bus mistakes that can ruin a flight plan.
AB Daily Check Board — Pick the Right Airport Route First
flight-day toolDo not treat “AB” as one simple bus. RTD’s current airport schedule tools group the Boulder / Denver Airport service as AB1 / AB2 / AB3. Your first decision is not the time. Your first decision is the correct route, correct direction, correct stop or gate, and correct travel day.
Choose AB1, AB2 or AB3
AB1 is the main Boulder airport route. AB2 and AB3 add extra airport options from different Boulder boarding points.
Pick direction
Choose to Denver Airport or to Boulder. The wrong direction means the wrong stop, gate and time.
Open official schedule
Use RTD’s route page for AB1, AB2 or AB3. Do not rely on an old airport PDF screenshot.
Open Next Ride
Use RTD Next Ride near departure time for live route, vehicle, stop and trip information.
Check fare
Airport travel uses RTD airport fare rules. Confirm the Airport Day Pass, discount and youth rules.
Add flight buffer
Build time for luggage, weather, traffic, walking through DEN, check-in and security.
Need the current official route list for AB1 / AB2 / AB3?
📄 Open RTD SchedulesQuick Answer: What Is the AB Bus Schedule?
The safest answer is: AB bus schedule = RTD Boulder / Denver Airport route family. In current RTD tools, look for AB1, AB2 and AB3 instead of only “AB.” These routes connect Boulder-area stops with Denver International Airport, using RTD airport service and RTD’s Next Ride live tracker.
Main airport route
Best starting point for most riders searching AB bus schedule, Boulder to DEN, Table Mesa, Downtown Boulder or DEN Transit Center.
Weekday airport option
Useful for Boulder Junction at Depot Square riders and selected Boulder-area airport trips.
Saturday airport option
Useful for additional Saturday service from Downtown Boulder and 28th Street-area stops.
Airport planning route
This is not a casual local bus search. You need fare, gate, live tracker and buffer before a flight.
⚠️ Route-code correction
Some pages and airport signs may still use “AB” as a shorthand for the Boulder airport bus family. For current RTD planning, use AB1, AB2 or AB3 in RTD’s official route tools.
Official AB Bus Tools for Schedule, Map, Stops, Fare and Live Times
These are the final-action links. This guide explains the route family, but RTD and DEN control exact schedules, gates, stops, fare products, accessibility and service alerts.
AB Route Picker: AB1 vs AB2 vs AB3
Choosing the wrong AB route can send you to the wrong Boulder station, wrong gate or wrong service day. Use this table as your first filter, then open the official RTD page for your travel date.
| Route | Best for | Main Boulder boarding logic | Before you leave |
|---|---|---|---|
| AB1 | Main Boulder ↔ Denver Airport airport-bus search | Downtown Boulder, Table Mesa and US 36 corridor airport access | Check AB1 schedule, DEN gate and Next Ride live status. |
| AB2 | Weekday airport option and Boulder Junction riders | Boulder Junction at Depot Square and selected Boulder stops | Confirm weekday service and exact station entrance. |
| AB3 | Saturday airport option | Downtown Boulder plus 28th Street / selected Boulder stops | Confirm Saturday-only pattern and current RTD schedule. |
💡 Simple route rule
Use AB1 when you are not sure, then compare AB2 or AB3 only after confirming your service day and Boulder boarding location.
AB Bus Stops and Route Map: Boulder, US 36, E-470 and Denver Airport
The AB route family is airport-focused, so stop planning matters more than a normal bus. Common stop areas include Downtown Boulder Station, Boulder Junction at Depot Square, 28th Street / Arapahoe / Canyon-area stops, US 36 & Table Mesa, US 36 corridor stations, and Denver Airport Station / DEN Transit Center. Use the map for orientation only, then verify your exact stop and gate in RTD tools.
Boulder stop logic
Downtown Boulder Station and Table Mesa are common AB1 search points. AB2 uses Boulder Junction at Depot Square. AB3 uses Downtown Boulder and selected 28th Street-area stops.
Airport stop logic
Denver Airport public transit is at the DEN Transit Center / Denver Airport Station. Follow airport signs and verify the current RTD bus gate.
Gate warning
Station gates matter. Table Mesa, Downtown Boulder and DEN can show specific gate or platform details in RTD tools.
- Use stop IDs: a stop code is safer than “Boulder station” or “airport bus stop.”
- Confirm direction: airport-bound and Boulder-bound stops can be on different sides or gates.
- Plan walking time: DEN Transit Center, baggage claim and security add real minutes.
- Watch service day: AB2 and AB3 are not identical to AB1.
- Check live: Next Ride can show whether you are looking at live or scheduled information.
⚠️ Map warning
This embedded map is for discovery only. RTD controls the official AB route map, stop list, gate details, live status and service alerts.
AB Live Tracker: How to Use RTD Next Ride Correctly
For airport travel, the live tracker is not optional. RTD Next Ride can help you check route, stop, facility and live arrival information. Use it close to your departure time, but keep the official schedule open so you know the trip is supposed to run on your travel day.
Open schedule first
Confirm AB1, AB2 or AB3 has a trip for your date and direction.
Open Next Ride
Search the route code or stop. Check whether live vehicle information is available.
Check stop or gate
Do not assume a previous airport or Boulder gate is still correct.
Read alerts
Weather, road issues, station work or airport operations can override a normal plan.
Need live route and stop information for AB1 right now?
⏱️ Open Next Ride AB1AB Fare and Payment: Airport Day Pass, Tap-n-Ride, Youth and Discount Rules
RTD’s fare page is the source to check before boarding an airport bus. Full-fare airport riders should pay attention to the Airport Day Pass, while discount fare riders, youth riders, active-duty military riders and pass holders should verify eligibility and proof rules before travel.
| Fare item | RTD planning note | Common mistake |
|---|---|---|
| Airport Day Pass | RTD lists an Airport Day Pass at $10, valid all service day across the system including the airport. | Buying a non-airport product for a DEN trip. |
| Tap-n-Ride | RTD says riders can tap a contactless card or mobile wallet at the validator. | Trying to solve fare questions while boarding with luggage. |
| Discount fares | Discount fares apply to eligible riders and include airport travel per RTD fare rules. | Forgetting proof of eligibility. |
| Youth / active-duty military | RTD lists youth 19 and under and active-duty U.S. military as riding free with proof. | Not carrying required proof when asked. |
⚠️ Fare-check rule
Do not copy fare advice from an old forum or screenshot. Airport fare policy can change, and the RTD fare page is the final source.
Flight-Time Planning: How Early to Take the AB Bus to DEN
The AB route family is useful because it connects Boulder and Denver Airport without needing to drive, but it must be planned like airport transportation. Your real trip time includes walking to the stop, waiting, boarding with luggage, road travel, walking inside DEN, check-in, bag drop, security and terminal movement.
Carry-on only
Still leave a buffer. Traffic, walking distance and security can stack quickly.
Checked bag
Add time for bag drop, airline counters and walking from the DEN Transit Center.
Winter weather
Snow, ice and road conditions can slow the bus and the airport itself.
Late arrival
Check westbound AB service before you land. Do not assume frequent late-night return trips.
💡 Airport-safe rule
If missing the AB bus could make you miss a flight, your plan is too tight. Take an earlier trip and protect the schedule.
AB2 and AB3 Video Help: Boulder Airport Service Changes
RTD has promoted AB2 and AB3 as added Boulder-to-airport options. The video below is included for riders who understand AB1 but need help with newer AB2 / AB3 route patterns.
Which AB Bus Did You Mean? RTD vs Other “AB” Searches
The letters “AB” can appear in many transit systems, cities and apps. This page focuses on the strongest U.S. airport-bus intent: RTD Boulder / Denver Airport AB1 / AB2 / AB3. If your city is not Boulder, Denver or DEN, verify the agency first before using this timetable.
RTD AB family
Use for Boulder, Table Mesa, Boulder Junction, Downtown Boulder and Denver Airport trips.
A-B route variants
Some agencies use A-B or AB as a local route label. Confirm city and operator before riding.
Alberta abbreviation
Search results may show Alberta bus tickets because AB is also the abbreviation for Alberta.
⚠️ Ambiguous route warning
Never board from a route-number page alone. Match agency + city + endpoint + stop. For this page, that means RTD, Boulder and Denver Airport.
Common AB Bus Schedule Mistakes That Waste Time
Searching only “AB”
Use AB1, AB2 or AB3 in RTD tools for accurate route results.
Wrong service day
AB2 and AB3 are not interchangeable. Check weekday and Saturday service separately.
Wrong stop or gate
Downtown Boulder, Table Mesa, Boulder Junction and DEN Transit Center require exact gate checks.
No live check
Airport travel should not depend on a static schedule alone. Use Next Ride.
Fare confusion
Airport fare products matter. Check RTD fares before boarding.
No flight buffer
A bus time is not the same as an airport arrival plan. Add luggage, security and walking time.
Related BusSchedules.org Guides for Airport and Route Riders
These internal links support the rider’s next likely action: checking AB1 specifically, comparing route-number pages, or continuing airport and transit planning without returning to search results.
AB Bus Schedule FAQs
What is the AB bus schedule?
The AB bus schedule usually means RTD’s Boulder / Denver Airport route family, including AB1, AB2 and AB3. Use RTD’s official schedule pages and Next Ride for current times.
Is AB one bus route or multiple routes?
In current RTD tools, AB is best treated as a route family: AB1, AB2 and AB3. Choose the correct route before checking stops or times.
Does the AB bus go to Denver Airport?
Yes. RTD lists AB1 / AB2 / AB3 as Boulder / Denver Airport service. Confirm the exact route, direction and travel day before leaving.
What is the difference between AB1, AB2 and AB3?
AB1 is the main Boulder airport route. AB2 is a weekday airport option tied to Boulder Junction at Depot Square. AB3 is a Saturday airport option using Downtown Boulder and selected stops.
How do I track the AB bus live?
Use RTD Next Ride. Search AB1, AB2 or AB3, choose the direction, then select the correct stop or facility.
Where do I catch the AB bus at Denver Airport?
Use DEN’s public bus/train information and RTD tools to reach the DEN Transit Center / Denver Airport Station, then verify the current RTD bus gate.
How much is the AB bus fare to Denver Airport?
RTD’s fare page lists an Airport Day Pass at $10 for full-fare airport travel. Check RTD for current discount, youth, pass and Tap-n-Ride rules.
Can youth ride RTD AB airport routes free?
RTD lists youth 19 and under as riding free with proof of eligibility. Check the official fare page before traveling.
Why is my AB bus not showing live?
The trip may not have started, live vehicle data may be unavailable, the wrong route or direction may be selected, or an alert may affect service. Check schedule, Next Ride and alerts together.
Can I use Google Maps for the AB bus?
Use Google Maps for discovery only. RTD controls official schedules, stops, gates, fares, live tracking and alerts.
How early should I take the AB bus before a flight?
Use an earlier bus than the minimum app estimate. Add buffer for walking to the stop, boarding with luggage, traffic, DEN Transit Center walking, check-in, security and terminal movement.
Is BusSchedules.org the official AB bus operator?
No. BusSchedules.org is an independent rider guide. Always verify final AB route schedules, stops, fares, gates, live tracking and alerts directly with RTD and DEN.
Final Rider Summary: Best Way to Use the AB Bus Schedule
The safest way to use the AB bus schedule is to treat it as the RTD Boulder / Denver Airport route family. Start by choosing AB1, AB2 or AB3, then check the official RTD schedule, choose the correct direction, verify the stop or gate, check airport fare rules, and open RTD Next Ride before leaving.
For flight trips, do not cut the plan close. Add time for luggage, weather, traffic, airport walking, check-in and security. A route can be running and still not be safe for a tight flight plan.
RTD AB1 schedule · RTD AB2 schedule · RTD AB3 schedule · RTD Next Ride