AB3
Boulder / Denver Airport
Bus
Timetable valid Sep 27, 2026 to Jan 2, 2027, from RTD's published schedule.
Departures from Downtown Boulder Station (Ar)
No weekdays service in this direction.
Live arrivals on the mapWhen it runs · Weekdays
No weekdays service in this direction.
The Sunday schedule also runs on Nov 26, Nov 27, Dec 25, Jan 1.
Route map
Stops (11) · To Dtwn Boulder via 28th St
- Denver Airport Station Gate 8(Timepoint)
- 13500 Block Via Varra
- US 36 & Flatiron Station Gate C(Timepoint)
- Via Varra Rd & Midway Blvd
- US 36 & McCaslin Station Gate E(Timepoint)
- US 36 & Table Mesa Station Gate E(Timepoint)
- 28th St & College Ave
- 28th St & Sundown La
- 28th St & Arapahoe Ave(Timepoint)
- Canyon Blvd & 28th St(Timepoint)
- Downtown Boulder Station (Ar)(Timepoint)(Selected stop)
Plan your trip and pay
- RTD's page for route AB3 (live arrivals)(opens rtd-denver.com)
- RTD trip planner(opens rtd-denver.com)
- Fares and passes(opens rtd-denver.com)
- Accessibility on RTD(opens rtd-denver.com)
- Service alerts(opens rtd-denver.com)
- Denver transit map
Source: RTD GTFS feed Sep26-37243-12-13-20261009-141920. Live arrivals come from RTD's real-time feed on the transit map.