The average bus between Oceanside and Diamond Bar takes 4h 42m and the fastest bus takes 3h 14m. The bus service runs several times per day from Oceanside to Diamond Bar. 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 Oceanside and Diamond Bar. The earliest departure is at 6:30 AM in the morning, and the last departure from Oceanside is at 11:10 PM which arrives into Diamond Bar at 8:04 AM. All services require a transfer at The Depot At Santa Ana Dock 3 and take an average of 4h 42m. The schedules shown below are for the next available departures.


3h 14m • 2 changes


3h 46m • 2 changes


4h 4m • 2 changes
Arrives next day


7h 34m • 2 changes


3h 14m • 2 changes


3h 46m • 2 changes


4h 4m • 2 changes
Arrives next day


7h 34m • 2 changes


3h 14m • 2 changes


3h 46m • 2 changes


4h 4m • 2 changes
Arrives next day


7h 34m • 2 changes


3h 14m • 2 changes


3h 46m • 2 changes


4h 4m • 2 changes
Arrives next day


7h 34m • 2 changes
Want to know about travelling from Oceanside to Diamond Bar? 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 Oceanside to Diamond Bar. However, there are services departing from Oceanside station and arriving at Diamond Bar station via Santa Ana Bus Stop. The journey, including transfers, takes approximately 4h 42m.
Oceanside to Diamond Bar bus services, operated by Amtrak, depart from Oceanside Transportation Center station.
Oceanside to Diamond Bar bus services, operated by Amtrak, arrive at Ring-Brea Mall station.
The distance between Oceanside and Diamond Bar is 100.8 km. The road distance is 122 km.
You can take a bus from Oceanside Transportation Center to Diamond Bar Blvd and Sunset Crossing Rd via The Depot At Santa Ana Dock 3, Ring-Brea Mall, and Brea Mall in around 3h 30m.