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This website contains updated information only for those corridors actively in construction, the Southeast Rail Extension and North Metro Rail. All other content on this website is meant for historical purposes only and may not be up-to-date. Please visit RTD-Denver.com for the latest information about RTD.

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Flatiron Flyer - Bus Rapid Transit

Flatiron Flyer is now in service

The U.S. 36 project is a Colorado Department of Transportation-led project that brought 18 miles of Bus Rapid Transit (BRT) service between Downtown Denver and Boulder along U.S. 36 as part of the FasTracks program.

FF Line logo

The Flatiron Flyer is the official name of RTD's new Bus Rapid Transit service that was added as part of the FasTracks program approved by voters in 2004. The Flatiron Flyer service, combined with the U.S. 36 highway and parking improvements, is the result of years of work and collaboration between RTD and CDOT.

The Flatiron Flyer is an efficient, quick and environmentally friendly commute option connecting Denver, Westminster, Broomfield, Boulder and everywhere in-between.

Convenient choices with multiple options

With the new line comes some new names. Match your current route with the new route name in the chart below.

Flatiron Flyer route name changes
See service changes that went into effect January 3, 2016.

Bikeway construction

Find out information about bikeway construction here.

Flatiron Flyer map
Click here for a larger version of the map

Northwest Area Mobility Study

The Northwest Area Mobility Study was an effort that developed a prioritized list of mobility improvements for the Northwest area of the Regional Transportation District's service area. Follow this link to learn more about the study.

Key Links

Flatiron Flyer bus rapid transit fact sheet.

Catch up on what's new.

Learn more about the project.

U.S. 36 BRT video flyover.

Flatiron Flyer

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