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Costa Mesa to Diamond Bar buses

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Trip Overview

The average bus between Costa Mesa and Diamond Bar takes 3h 16m and the fastest bus takes 2h 29m. There is a bus service every few hours from Costa Mesa 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.

3h 16m
Duration
31 mi
Distance
$10
Average price
Hourly
Frequency

Line 57 bus, line 286 bus

best
  1. Take the bus from Bristol-Sunflower to Ring-Brea Mallbus bus 57
  2. Take the bus from Brea Mall to Diamond Bar Blvd and Sunset Crossing Rdbus bus 286
3h 15m
$5–10

Costa Mesa to Diamond Bar bus times

Buses run hourly between Costa Mesa and Diamond Bar. 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 Diamond Bar at 8:04 AM. All services require a transfer at Bristol-Sunflower and take an average of 3h 16m. The schedules shown below are for the next available departures.

Departing Thursday, October 8, 2026

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    OCTAOCTAFoothill Transit3h 4m • 2 changes

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    OCTAOCTAFoothill Transit3h 9m • 2 changes

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    OCTAOCTAFoothill Transit3h 9m • 2 changes

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    OCTAOCTAFoothill Transit3h 9m • 2 changes
  • Show more

Departing Friday, October 9, 2026

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    OCTAOCTAFoothill Transit2h 29m • 2 changes

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    OCTAOCTAFoothill Transit2h 29m • 2 changes

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    OCTAOCTAFoothill Transit3h • 2 changes

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    OCTAOCTAFoothill Transit3h 2m • 2 changes
  • Show more

Departing Saturday, October 10, 2026

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    OCTAOCTAFoothill Transit2h 37m • 2 changes

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    OCTAOCTAFoothill Transit2h 37m • 2 changes

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    OCTAOCTAFoothill Transit2h 39m • 2 changes

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    OCTAOCTAFoothill Transit2h 40m • 2 changes
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Departing Monday, October 12, 2026

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    OCTAOCTAFoothill Transit2h 29m • 2 changes

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    OCTAOCTAFoothill Transit2h 29m • 2 changes

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    OCTAOCTAFoothill Transit3h • 2 changes

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    OCTAOCTAFoothill Transit3h 2m • 2 changes
  • Show more

Frequently asked questions

Want to know about travelling from Costa Mesa 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.

Map of how to get from Costa Mesa to Diamond Bar.ExpandLaunch map view
  • Distance: 31.5 mi
  • Duration: 3h 16m

What companies run services between Costa Mesa, CA, USA and Diamond Bar, CA, USA?

You can take a bus from Harbor-Bernard to Diamond Bar Blvd and Sunset Crossing Rd via Bristol-Sunflower, Ring-Brea Mall, and Brea Mall in around 3h 15m.

Operators