The average bus between Rialto and Costa Mesa takes 4h 12m and the fastest bus takes 3h 18m. The bus service runs several times per day from Rialto to Costa Mesa. 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 every 3 hours between Rialto and Costa Mesa. The earliest departure is at 5:19 AM in the morning, and the last departure from Rialto is at 11:06 PM which arrives into Costa Mesa at 6:11 AM. All services require a transfer at San Bernardino and take an average of 4h 12m. The schedules shown below are for the next available departures.


3h 58m • 2 changes

3h 29m • 2 changes

3h 46m • 2 changes

3h 18m • 2 changes

4h 25m • 2 changes

3h 53m • 2 changes

3h 44m • 2 changes

3h 53m • 2 changes

4h 25m • 2 changes

3h 53m • 2 changes

3h 44m • 2 changes

3h 53m • 2 changes

4h 17m • 2 changes

3h 32m • 2 changes

3h 44m • 2 changes

4h 1m • 2 changesArrives next day


9h 48m • 2 changesArrives next day


9h 43m • 2 changes

4h 25m • 2 changes

3h 53m • 2 changes

3h 44m • 2 changes

3h 53m • 2 changesWant to know about travelling from Rialto to Costa Mesa? 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 Rialto to Costa Mesa. However, there are services departing from Rialto station and arriving at Costa Mesa station via Harbor + Katella. The journey, including transfers, takes approximately 4h 12m.
Rialto to Costa Mesa bus services, operated by Omnitrans, depart from San Bernardino station.
Rialto to Costa Mesa bus services, operated by Omnitrans, arrive at Harbor-19Th station.
The distance between Rialto and Costa Mesa is 72.4 km. The road distance is 113 km.
You can take a bus from Foothill @ Riverside Avenue to Harbor-19Th via San Bernardino, Harbor + Katella, and Harbor-Katella in around 4h 31m.