Travel with ease on the Flatiron Flyer between Denver, Westminster, Broomfield, Louisville, Superior, and Boulder.

The Flatiron Flyer is a bus rapid transit service that transforms your travels between Denver, Boulder and all points in-between. Bus Rapid Transit (BRT) is a type of bus service used across the nation to provide convenient, frequent, schedule-free travel options.

The Flatiron Flyer travels in the US 36 express lanes.

Convenient choices with multiple options

The hallmark of bus rapid transit is frequent, reliable, and predictable service. The Flatiron Flyer service provides multiple options with convenient travel choices.

Depending on time of day and direction of travel, there may be multiple routes that work for you. Use the interactive Trip Calculator below to choose your route.

  • Route FF1 All-stations, all day

    This route travels between Union Station and Downtown Boulder Station. You can expect a bus every 15 minutes, all day. This is the ultimate car-free convenience, allowing travelers to have a reliable option morning, noon and night.

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  • Route FF2 Express service, fewer stops

    FF2 connects Union Station and Downtown Boulder Station, with connections only at US36 & Table Mesa Station and US36 & McCaslin Station. Expect a bus every 10 minutes during weekday rush hours.

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  • Route FF3 Broomfield to Union Station

    FF3 travels from Broomfield to Union Station, with stops at US36 & Church Ranch Station and US36 & Sheridan Station. This mid-way route operates weekdays every 15 minutes in the morning to Union Station and every 15 minutes in the evening returning to US36 & Broomfield Station.

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  • Route FF4 Boulder Junction Station to Civic Center Station

    FF4 connects Boulder Junction at Depot Square Station to Civic Center Station, with service every 15 minutes or better in both directions during weekday rush hours.

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  • Route FF5 Downtown Boulder Station to Anschutz

    FF5 provides service between Downtown Boulder Station and Anschutz Medical Campus primarily in the a.m. and p.m. peaks.

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  • Route FF6 Boulder Junction Station to Union Station

    Route FF6 provides service between Boulder Junction Station at Depot Square Station and Union Station, with stops at four stations in-between. Weekday rush-hour service operates with three morning northbound trips and four afternoon trips southbound. FF6 is a 'reverse commute' route so it operates from Denver to Boulder in the morning and in reverse during the afternoon/evenings.

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  • Route FF7 (Formerly 90L) US36 & Sheridan Station to Civic Center Station

    FF7 operates between US 36 & Sheridan Station and Civic Center Station with several stops in Downtown Denver. Weekday rush-hour service operates nine morning peak and ten afternoon peak trips.

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Route FF1 stops
  • Downtown Boulder Station
  • Broadway & Euclid
  • Broadway & Baseline
  • Broadway & Dartmouth*
  • 39th & Table Mesa PnR / Broadway & Table Mesa (WB)
  • US 36 & Table Mesa Station
  • US 36 & McCaslin Station
  • US 36 & Flatiron Station
  • US 36 & Broomfield Station
  • US 36 & Church Ranch Station
  • US 36 & Sheridan Station
  • Park Ave & Delgany / Wewatta (WB)
  • Union Station
  • * Temporary stop until Broadway at Regent/20th construction is completed.
Route FF2 stops
  • Downtown Boulder Station
  • Broadway & Euclid
  • Broadway & Baseline
  • Broadway & Dartmouth*
  • 39th & Table Mesa PnR / Broadway & Table Mesa (WB)
  • US 36 & Table Mesa Station
  • US 36 & McCaslin Station
  • Park Ave & Delgany / Wewatta (WB)
  • Union Station
  • * Temporary stop until Broadway at Regent/20th construction is completed.
Route FF3 stops
  • US 36 & Broomfield Station
  • US 36 & Church Ranch Station
  • US 36 & Sheridan Station
  • Union Station
Route FF4 stops
  • Boulder Junction at Depot Square Station
  • 28th & Walnut / 28th & Canyon (WB)
  • 28th & Arapahoe
  • 28th & Colorado / 28th & College (WB)
  • US 36 & Table Mesa Station
  • US 36 & McCaslin Station
  • US 36 & Flatiron Station
  • US 36 & Broomfield Station
  • Park Ave & Delgany / Wewatta
  • 20th & Larimer / 19th & Market (EB)
  • 18th & California / 19th & Stout (EB)
  • 18th & Welton / Broadway & Glenarm (EB)
  • Civic Center Station
Route FF5 stops
  • Downtown Boulder Station
  • Broadway & Euclid
  • Broadway & Baseline
  • Broadway & Dartmouth*
  • 39th & Table Mesa PnR / Broadway & Table Mesa (WB)
  • US 36 & Table Mesa Station
  • US 36 & McCaslin Station
  • US 36 & Broomfield Station
  • US 36 & Sheridan Station
  • Fitzsimons Pkwy & Montview Blvd (EB only)
  • Colfax & Fitzsimons Pkwy
  • Colfax & Wheeling
  • Colfax & Vaughn
  • 17th Pl & Aurora Ct
  • Aurora Ct & 17th Ave
  • Aurora Ct & 16th Ave
  • Quentin & 16th Ave
  • Quentin & 17th Pl
  • Quentin & 19th Pl
  • * Temporary stop until Broadway at Regent/20th construction is completed.
Route FF6 stops
  • Boulder Junction at Depot Square Station
  • Pearl Pkwy & Pearl E. Cir E. / Pearl Pkwy & 49th
  • Central Ave & Flatiron Pkwy E
  • Arapahoe & 55th
  • Arapahoe & 48th
  • Arapahoe & 38th / Arapahoe & Marine
  • Arapahoe & 30th
  • 28th & Arapahoe
  • 28th & Colorado / 28th & College
  • US 36 & Table Mesa Station
  • US 36 & McCaslin Station
  • US 36 & Broomfield Station
  • US 36 & Sheridan Station
  • Park Ave & Delgany / Wewatta
  • Union Station
Route FF7 stops
  • US 36 & Sheridan Station
  • 19th St & Stout
  • Civic Center Station

Loading trip calculator

Boulder Junction at Depot Square Downtown Boulder * US 36 Table Mesa US 36 & McCaslin PnR US 36 & East Flatiron Circle PnR US 36 & Broomfield PnR US 36 & Church Ranch PnR US 36 & Sheridan PnR ** Union Station Civic Center Anschutz Medical Center
Boulder Junction at Depot Square -- -- Local Local Regional Regional Regional Regional Regional Regional Regional
Downtown Boulder * -- -- Local Local Regional Regional Regional Regional Regional Regional Regional
US 36 Table Mesa Local Local -- Local Regional Regional Regional Regional Regional Regional Regional
US 36 & McCaslin PnR Local Local Local -- Local Local Local Regional Regional Regional Regional
US 36 & East Flatiron Circle PnR Regional Regional Regional Local -- Local Local Local Regional Regional Regional
US 36 & Broomfield PnR Regional Regional Regional Local Local -- Local Local Regional Regional Regional
US 36 & Church Ranch PnR Regional Regional Regional Local Local Local -- Local Regional Regional Regional
US 36 & Sheridan PnR ** Regional Regional Regional Regional Local Local Local -- Local Local Regional
Union Station Regional Regional Regional Regional Regional Regional Regional Local -- -- --
Civic Center Regional Regional Regional Regional Regional Regional Regional Local -- -- --
Anschutz Medical Center Regional Regional Regional Regional Regional Regional Regional Regional -- -- --
* Formerly Boulder Transit Center
** Formerly US 36•Westminster Center

Weekday Frequencies

Bus Rapid Transit Route Eastbound to Denver Westbound to Boulder
AM Peak Midday PM Peak AM Peak Midday PM Peak
FF1 Union Station and Downtown Boulder Station 15 min 15 min 15 min 15 min 15 min 15 min
FF2 Express Union Station and Downtown Boulder Station 10 min -- 10 min 10 min -- 10 min
FF3 Union Station and US 36 & Broomfield Station 15 min -- -- -- -- 15 min
FF4 Boulder Junction at Depot Square and Civic Center Station 15 min -- 15 min 15 min -- 15 min
FF5 Downtown Boulder Station and Anschutz Medical Campus 30 min -- 3 trips 3 trips -- 30 min
FF6 Boulder Junction at Depot Square Station and Union Station -- -- 3 trips 3 trips -- --
FF7 US 36 & Sheridan Station and Civic Center Station 20 min -- -- -- -- 20 min
Updated station with new red canopy and seating

Upgraded, updated, stylish stations

Stations include canopies, seating, ticket vending machines and digital information displays. These facilities provide protection from the elements as well as technological conveniences.

Passengers can purchase a ticket before boarding the bus, which speeds up boarding times. The digital information displays also show scheduled bus departure information.

Big and Blue

  • Vehicle: 45’ MCI D4500 commuter coach
  • Fuel type: Ultra low-sulfur clean diesel
  • Luggage compartments: Approximately 750 cubic feet of storage space
  • Seating: 57 seats
  • Wheelchair accessible: Equipped with a wheelchair lift and two wheelchair securement spaces
  • Bike Storage: Can carry up to 8 bikes
  • Unique feature: Each seat has a 120-volt outlet and USB port for charging electronic devices.
Flatiron Flyer bus interior
Outlets located on bus
Passenger loading bike into bus storage compartments
Passenger loading luggage into above seat compartment
Flatiron Flyer rider loading bike Front view of the Flatiron Flyer bus

Bike connectivity

Alternative forms of transportation are a key part of creating a sustainable transportation network, which is why on-board bike storage, bike parking, and bike paths are key features of the Flatiron Flyer and US36 improvement project.

US36 Bikeway

An 18 mile bike highway is being constructed between US36 & Table Mesa Station and 80th Avenue in Westminster. The bikeway is paved, 12 feet wide, and features protective barriers along the highway.

Bike Parking and Storage

There are over 270 bike parking spaces on RTD property along the Flatiron Flyer route, including bike racks and reservable bike lockers. The Flatiron Flyer bus can also carry up to eight bikes if you need to complete your commute on two wheels.

Secure Bicycle Parking

Bus-Then-Bike Shelters currently provide long-term, secure, and weather-protected bicycle storage at two future Flatiron Flyer stations: US36 & Table Mesa Station and Downtown Boulder Station. Commuters can combine a bus trip and bike ride by keeping a bike in the shelter overnight or during the day and biking the first or final mile to or from a Flatiron Flyer Station.

Additional shelters are in the works at US36 & McCaslin Station and Boulder Junction at Depot Square Station, and planned for the US36 & Sheridan and US36 & Broomfield Stations. For an access card, sign up at www.BusThenBike.com