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Diamond Bar to Costa Mesa buses

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Trip Overview

The average bus between Diamond Bar and Costa Mesa takes 3h 7m and the fastest bus takes 2h 34m. There is a bus service every few hours from Diamond Bar 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.

3h 7m
Duration
34 mi
Distance
$10
Average price
Hourly
Frequency

Line 286 bus, line 57 bus, line 55 bus

best
  1. Take the bus from Diamond Bar Blvd and Sunset Crossing Rd to Brea Mallbus bus 286
  2. Take the bus from Ring-Brea Mall to Bristol-Sunflowerbus bus 57
  3. Take the bus from Bristol-Sunflower to 19Th-Harborbus bus 55
2h 51m
$6–10

Diamond Bar to Costa Mesa bus times

Buses run hourly between Diamond Bar and Costa Mesa. The earliest departure is at 6:34 AM in the morning, and the last departure from Diamond Bar is at 10:33 PM which arrives into Costa Mesa at 5:01 AM. All services require a transfer at Brea Mall and take an average of 3h 7m. The schedules shown below are for the next available departures.

Departing Monday, October 26, 2026

  •  → 

    Foothill TransitOCTAOCTA3h 13m • 2 changes

  •  → 

    Foothill TransitOCTAOCTA2h 44m • 2 changes

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    Foothill TransitOCTAOCTA2h 38m • 2 changes

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    Foothill TransitOCTAOCTA2h 43m • 2 changes
  • Show more

Departing Tuesday, October 27, 2026

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    Foothill TransitOCTAOCTA3h 12m • 2 changes

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    Foothill TransitOCTAOCTA3h 10m • 2 changes

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    Foothill TransitOCTAOCTA3h 10m • 2 changes

  •  → 

    Foothill TransitOCTAOCTA2h 46m • 2 changes
  • Show more

Departing Wednesday, October 28, 2026

  •  → 

    Foothill TransitOCTAOCTA3h 12m • 2 changes

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    Foothill TransitOCTAOCTA3h 10m • 2 changes

  •  → 

    Foothill TransitOCTAOCTA3h 10m • 2 changes

  •  → 

    Foothill TransitOCTAOCTA2h 46m • 2 changes
  • Show more

Departing Thursday, October 29, 2026

  •  → 

    Foothill TransitOCTAOCTA3h 12m • 2 changes

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    Foothill TransitOCTAOCTA3h 10m • 2 changes

  •  → 

    Foothill TransitOCTAOCTA3h 10m • 2 changes

  •  → 

    Foothill TransitOCTAOCTA2h 46m • 2 changes
  • Show more

Departing Friday, October 30, 2026

  •  → 

    Foothill TransitOCTAOCTA3h 12m • 2 changes

  •  → 

    Foothill TransitOCTAOCTA3h 10m • 2 changes

  •  → 

    Foothill TransitOCTAOCTA3h 10m • 2 changes

  •  → 

    Foothill TransitOCTAOCTA2h 46m • 2 changes
  • Show more

Departing Saturday, October 31, 2026

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    Foothill TransitOCTAOCTA2h 38m • 2 changes

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    Foothill TransitOCTAOCTA2h 38m • 2 changes

  •  → 

    Foothill TransitOCTAOCTA2h 37m • 2 changes

  •  → 

    Foothill TransitOCTAOCTA2h 37m • 2 changes
  • Show more

Frequently asked questions

Want to know about travelling from Diamond Bar 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.

Map of how to get from Diamond Bar to Costa Mesa.ExpandLaunch map view
  • Distance: 33.6 mi
  • Duration: 3h 7m

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

You can take a bus from Diamond Bar Blvd and Sunset Crossing Rd to 19Th-Harbor via Brea Mall, Ring-Brea Mall, and Bristol-Sunflower in around 2h 51m.

Operators