GDT > RTD Rider’s Guide > Routes > Route AB – Boulder / Denver Airport
SkyRide Routes AB1 and AB2, ‘Boulder / Denver Airport’, run from to Downtown Boulder Station to Denver Airport via US 36, Flatiron, the Northwest Parkway and E-470.
Map & Schedule
Route AB1 operates 7 days a week. Frequency is generally 60 minutes at all times, although an extra trip is offered in the early afternoon to serve a common end of shift time for airport employees.
Route AB2 operates Monday – Saturday only providing peak period service at 60 minute frequency via 28th Street in Boulder. The route was suspended due to the Covid-19 pandemic and proposed to be reinstated in the System Optimization Plan, this was partially done in January 2025.
Vehicles Used
The route is operated by RTD using MCI D4500CT over-the-road coaches from Boulder Garage.
Ridership
| Year | Route AB | Route AB1 | Route AB2 | Total |
| 2018 | – | 598,000 | 62,000 | 660,000 |
| 2019 | 2,000 | 619,000 | 111,000 | 732,000 |
| 2020 | – | 288,000 | 28,000 | 316,000 |
| 2021 | – | 409,000 | – | 409,000 |
| 2022 | – | 522,000 | – | 522,000 |
| 2023 | – | 601,000 | – | 601,000 |
| 2024 | – | 641,000 | – | 641,000 |
Note: Figures from 2021 include former Route AB and AB2 riders.
Current Issues
None reported.
Future Plans
The System Optimization Plan proposes to reinstate route AB2 service in the peak periods, 7 days a week.