How far is Brentwood, CA from Diamond, CA?
The driving distance from Brentwood, CA to Diamond, CA is about 15 miles (24.1 km), with a travel time of about 00h 21m by car.
- The straight-line flight distance is about 12.4 miles (20 km).
- For a round trip, plan for roughly 00h 43m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 7:00 AM to 7:00 PM PDT.
Reverse, save, or send this route
This is an easy same-day return drive. Copy the route link, send it to another device, or print a clean version before you head out.
This is an easy same-day return drive.
Flight Distance
Driving Distance
Gas Cost Calculator
Leave and Arrive Planner
Pick a departure time to see your estimated arrival and same-day return window.
Drive time stays fixed at 00h 21m.
This is a short drive, so your comfort window is wide. Traffic and current weather matter more than the clock.
You are leaving earlier than the recommended window, which gives you extra margin for breaks and traffic.
Halfway Point
A useful midpoint for breaks, coffee, or meeting in the middle.
The most populous city in Contra Costa County, California.
Route Weather Snapshot
Check the forecast at both ends before you head out.
Sunny
Sunny
Driving Route Map
The map below follows the saved road route between Brentwood and Diamond.
Turn-by-Turn Driving Directions
Step-by-step road directions between Brentwood and Diamond.
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1
Start on Brentwood Boulevard
2299 ft · 43 sec · Brentwood Boulevard
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2
Turn left onto 2nd Street
902 ft · 34 sec · 2nd Street
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3
Continue on Second Street
678 ft · 19 sec · Second Street
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4
Continue on O'Hara Avenue
2464 ft · 1 min · O'Hara Avenue
-
5
Turn left onto Sand Creek Road
2 mi · 4 min · Sand Creek Road
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6
Take the ramp right toward CA 4 West: Martinez
1291 ft · 33 sec
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7
Merge slight left
10.2 mi · 12 min
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8
Take the exit slight right toward Railroad Avenue, Harbor Street
1860 ft · 32 sec
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9
Turn left onto California Avenue
2418 ft · 49 sec · California Avenue
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10
Turn right onto Railroad Avenue
1197 ft · 35 sec · Railroad Avenue
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11
Turn left onto Civic Avenue
1551 ft · 54 sec · Civic Avenue
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12
Turn left onto Dimaggio Avenue
30 m · 4 sec · Dimaggio Avenue
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13
Arrive at your destination
0 m · 1 sec · Dimaggio Avenue
Car Route Details
A richer read on the saved driving route between Brentwood and Diamond.
Turn-heavy local drive
The route has frequent decision points for its length, so lane choice and turn timing will matter more than cruising speed.
CA 4 West
Merge slight left
10.2 mi · 00h 12m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A short regional drive
This route is short enough to handle as a quick errand, commute, or easy same-day return without much planning overhead.
Sunny leaving Brentwood and Sunny near Diamond.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Brentwood to Diamond?
The road trip is about 15 miles (24.1 km) and usually takes 00h 21m in normal driving conditions.
Is this a same-day trip or an overnight route?
This route is short enough to handle as a quick errand, commute, or easy same-day return without much planning overhead.
What is the halfway point on this route?
Antioch is a useful midpoint, sitting about 7.5 miles from Brentwood and 7.5 miles from Diamond.
How much longer is the road route than the straight-line distance?
The direct path is about 12.4 miles (20 km), while the road route adds roughly 2.6 extra miles because roads do not follow the straight air line.
When is the best time to leave for this route?
A good departure window is usually 7:00 AM to 7:00 PM PDT. If you want a more comfortable same-day return, try to leave by 7:46 PM PDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $3.06 one way or $6.12 round trip. Estimated CO2 is about 4.7 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around Brentwood and Sunny near Diamond.
Stop Ideas Near Antioch
Useful break, food, and waypoint ideas within about 15 miles of the route midpoint.
Transit and Meeting Points
Useful pickup, handoff, or rendezvous points close to Antioch.
Antioch–Pittsburg
Rio Vista, CA
Martinez station
Suisun–Fairfield station
Flight Path Map
This map shows the direct air route between Brentwood and Diamond. Straight-line distance: 12.41 mi (19.98 km).
#1 Brentwood
The most populous city in Contra Costa County, California.
| Population | 65,017 |
| Coordinates | 37.9318700, -121.6957900 |
| Altitude | 24 |
| Country | United States |
#2 Diamond
Diamond is a place in California, United States.
| Population | 0 |
| Coordinates | 38.0215900, -121.8932900 |
| Altitude | 13 |
| Country | United States |
End: Diamond (-121.89329, 38.02159)
Estimated Travel Time
Distance: 24 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 00h 29m |
| 40 mph (64.37 km/h) | 00h 22m |
| 50 mph (80.47 km/h) | 00h 17m |
| 60 mph (96.56 km/h) | 00h 14m |
| 70 mph (112.65 km/h) | 00h 12m |
| 80 mph (129 km/h) | 00h 11m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $5.77 | $3.06 | $6.12 |
| Mid-grade | $6.07 | $3.21 | $6.43 |
| Premium | $6.24 | $3.31 | $6.62 |
| Diesel | $7.57 | $4.01 | $8.02 |
Assumes 8.3 L/100 km (about 28.3 MPG). CO2 is an estimate and varies by vehicle, fuel blend, traffic, and terrain.
Prices in California · Apr 18, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.