The average bus between Diamond Bar and Portland takes 25h 31m and the fastest bus takes 24h 12m. There is at least one bus per day from Diamond Bar to Portland. 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 once daily between Diamond Bar and Portland. The earliest departure is at 8:33 AM in the morning, and the last departure from Diamond Bar is at 9:29 PM which arrives into Portland at 12:20 AM. All services require a transfer at Union Station Patsaouras Bus Plaza W and take an average of 25h 31m. The schedules shown below are for the next available departures.
Arrives next day


24h 12m • 2 changes
Arrives +2 days


26h 51m • 2 changes
Arrives next day


24h 12m • 2 changes
Arrives +2 days


26h 51m • 2 changes
Want to know about travelling from Diamond Bar to Portland? 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 Diamond Bar to Portland. However, there are services departing from Diamond Bar station and arriving at Portland station via Union Station Patsaouras Bus Plaza W station. The journey, including transfers, takes approximately 25h 31m.
Diamond Bar to Portland bus services, operated by Foothill Transit, depart from Cal Poly Pomona Admin station.
Diamond Bar to Portland bus services, operated by Foothill Transit, arrive at Portland Curbside Bus Stop station.
The distance between Diamond Bar and Portland is 1,343.4 km. The road distance is 1,627 km.
You can take a bus from Cal Poly Pomona Admin to Portland Curbside Bus Stop via Union Station Patsaouras Bus Plaza W, Los Angeles Union Station, and Sacramento Bus Station in around 25h 18m.