The average bus between Costa Mesa and Ontario takes 4h 27m and the fastest bus takes 3h 15m. There is a bus service every few hours from Costa Mesa to Ontario. 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 hourly between Costa Mesa and Ontario. The earliest departure is at 5:15 AM in the morning, and the last departure from Costa Mesa is at 10:27 PM which arrives into Ontario at 7:28 AM. All services require a transfer at Bristol-Sunflower and take an average of 4h 27m. The schedules shown below are for the next available departures.



4h 14m • 3 changes


4h 20m • 3 changes


3h 51m • 3 changes


3h 54m • 3 changes


3h 15m • 3 changes


3h 25m • 3 changes


3h 57m • 3 changes


3h 59m • 3 changes


3h 29m • 3 changes


3h 34m • 3 changes


3h 37m • 3 changes


3h 45m • 3 changes


3h 15m • 3 changes


3h 25m • 3 changes


3h 57m • 3 changes


3h 59m • 3 changesWant to know about travelling from Costa Mesa to Ontario? 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 Costa Mesa to Ontario. However, there are services departing from Costa Mesa station and arriving at Ontario station via Ring-Brea Mall. The journey, including transfers, takes approximately 4h 27m.
Costa Mesa to Ontario bus services, operated by OCTA, depart from Bristol-Sunflower station.
Costa Mesa to Ontario bus services, operated by OCTA, arrive at Pomona Transit Center station.
The distance between Costa Mesa and Ontario is 53.1 km. The road distance is 68 km.
You can take a bus from Harbor-Bernard to Holt @ Palm via Bristol-Sunflower, Ring-Brea Mall, Brea Mall, and Pomona Transit Center in around 4h 12m.