The average bus between Diamond Bar and Irwindale takes 1h and the fastest bus takes 35 min. The bus service runs several times per day from Diamond Bar to Irwindale. 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 4 times a day between Diamond Bar and Irwindale. The earliest departure is at 7:03 AM in the morning, and the last departure from Diamond Bar is at 9:29 PM which arrives into Irwindale at 10:49 PM. All services require a transfer, and take on average 1h. The schedules shown below are for the next available departures.

46 min • 1 change

48 min • 1 change

49 min • 1 change

49 min • 1 change
Want to know about travelling from Diamond Bar to Irwindale? 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 Irwindale. However, there are services departing from Diamond Bar station and arriving at Irwindale station via West Covina Pkwy and California Ave W. The journey, including transfers, takes approximately 1h.
Diamond Bar to Irwindale bus services, operated by Foothill Transit, depart from Cal Poly Pomona Admin station.
Diamond Bar to Irwindale bus services, operated by Foothill Transit, arrive at Irwindale Ave and Arrow Hwy N station.
The distance between Diamond Bar and Irwindale is 14.4 km. The road distance is 18 km.
You can take a bus from Cal Poly Pomona Admin to Irwindale Ave and Arrow Hwy N via West Covina Pkwy and California Ave W in around 57 min.