The average bus between Thornton and Keystone takes 7h 26m and the fastest bus takes 2h 57m. The bus service runs several times per day from Thornton to Keystone. The journey time may be longer on weekends and holidays; use the search form on this page to search for a specific travel date.
Buses run 3 times a day between Thornton and Keystone. The earliest departure is at 7:24 AM in the morning, and the last departure from Thornton is at 11:07 PM which arrives into Keystone at 8:24 AM. All services require a transfer at Union Station and take an average of 7h 26m. The schedules shown below are for the next available departures.


3h 7m • 2 changes


3h 7m • 2 changes
Arrives next day


12h 6m • 2 changes
Arrives next day


9h 25m • 2 changes


3h 7m • 2 changes


3h 7m • 2 changes
Arrives next day


12h 6m • 2 changes
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9h 25m • 2 changes


3h • 2 changes


2h 57m • 2 changes


2h 57m • 2 changes
Arrives next day


11h 48m • 2 changes


3h 7m • 2 changes


3h 7m • 2 changes
Arrives next day


12h 6m • 2 changes
Arrives next day


9h 25m • 2 changes
Want to know about travelling from Thornton to Keystone? We have put together a list of the most frequently asked questions from our users such as: What is the cheapest mode of transport? What is the quickest option? How much do tickets usually cost? and many more.
No, there is no direct bus from Thornton to Keystone. However, there are services departing from Thornton station and arriving at Keystone station via Frisco Transit Center. The journey, including transfers, takes approximately 7h 26m.
Thornton to Keystone bus services, operated by Regional Transportation District, depart from Union Station Gate B19.
Thornton to Keystone bus services, operated by Regional Transportation District, arrive at Frisco Transit Center station.
The distance between Thornton and Keystone is 90.1 km. The road distance is 146 km.
Bustang operates a bus from Union Station Gate B19 to Frisco Transit Center every 30 minutes. Tickets cost $11–16 and the journey takes 1h 45m.