How far is Diamond, CA from San Ramon, CA?
The driving distance from Diamond, CA to San Ramon, CA is about 27.3 miles (44 km), with a travel time of about 00h 28m by car.
- The straight-line flight distance is about 17.3 miles (27.9 km).
- For a round trip, plan for roughly 00h 57m 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 28m.
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.
City in Contra Costa County, California, USA
Route Weather Snapshot
Check the forecast at both ends before you head out.
Sunny
Mostly Sunny
Driving Route Map
The map below follows the saved road route between Diamond and San Ramon.
Turn-by-Turn Driving Directions
Step-by-step road directions between Diamond and San Ramon.
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1
Start on Dimaggio Avenue
30 m · 6 sec · Dimaggio Avenue
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2
Turn right onto West 17th Street
79 m · 11 sec · West 17th Street
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3
Continue on Civic Avenue
1239 ft · 38 sec · Civic Avenue
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4
Turn right onto Railroad Avenue
865 ft · 21 sec · Railroad Avenue
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5
Take the ramp slight right toward CA 4 West: Hercules
2562 ft · 36 sec
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6
Merge slight left
7.1 mi · 8 min
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7
Keep slight right to continue on CA 242: Oakland, Concord
4.6 mi · 5 min
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8
Merge slight left onto Senator Daniel E Boatwright Highway
4.8 mi · 6 min · Senator Daniel E Boatwright Highway
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9
Continue on Donald D Doyle Highway
1.4 mi · 2 min · Donald D Doyle Highway
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10
Keep slight right to continue on Donald D Doyle Highway
7.9 mi · 9 min · Donald D Doyle Highway
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11
Take the exit slight right toward Crow Canyon Road
1500 ft · 39 sec
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12
Turn right onto Crow Canyon Road
152 m · 15 sec · Crow Canyon Road
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13
Turn right onto San Ramon Valley Boulevard
1950 ft · 1 min · San Ramon Valley Boulevard
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14
Continue on San Ramon Valley Boulevard
111 m · 9 sec · San Ramon Valley Boulevard
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15
Arrive at your destination
0 m · 1 sec · San Ramon Valley Boulevard
Car Route Details
A richer read on the saved driving route between Diamond and San Ramon.
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.
Donald D Doyle Highway
Keep slight right to continue on Donald D Doyle Highway
7.86 mi · 00h 09m
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 Diamond and Mostly Sunny near San Ramon.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Diamond to San Ramon?
The road trip is about 27.3 miles (44 km) and usually takes 00h 28m 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?
Pleasant Hill is a useful midpoint, sitting about 13.7 miles from Diamond and 13.6 miles from San Ramon.
How much longer is the road route than the straight-line distance?
The direct path is about 17.3 miles (27.9 km), while the road route adds roughly 10 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 7:32 PM PDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $5.54 one way or $11.08 round trip. Estimated CO2 is about 8.5 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around Diamond and Mostly Sunny near San Ramon.
Stop Ideas Near Pleasant Hill
Useful break, food, and waypoint ideas within about 15 miles of the route midpoint.
Frank H. Ogawa Plaza
Berkeley Community Media
Alameda County Marriage License
OAKLAND CITY HALL
Transit and Meeting Points
Useful pickup, handoff, or rendezvous points close to Pleasant Hill.
Martinez station
Emeryville station
Berkeley station
Antioch–Pittsburg
Flight Path Map
This map shows the direct air route between Diamond and San Ramon. Straight-line distance: 17.32 mi (27.88 km).
#1 Diamond
Diamond is a place in California, United States.
| Population | 0 |
| Coordinates | 38.0215900, -121.8932900 |
| Altitude | 13 |
| Country | United States |
#2 San Ramon
A city in Contra Costa County, California.
| Population | 82,865 |
| Coordinates | 37.7799300, -121.9780200 |
| Altitude | 148 |
| Country | United States |
End: San Ramon Valley Boulevard (-121.977971, 37.779945)
Estimated Travel Time
Distance: 44 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 00h 54m |
| 40 mph (64.37 km/h) | 00h 41m |
| 50 mph (80.47 km/h) | 00h 32m |
| 60 mph (96.56 km/h) | 00h 27m |
| 70 mph (112.65 km/h) | 00h 23m |
| 80 mph (129 km/h) | 00h 20m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $5.77 | $5.54 | $11.08 |
| Mid-grade | $6.07 | $5.82 | $11.65 |
| Premium | $6.24 | $5.99 | $11.99 |
| Diesel | $7.57 | $7.26 | $14.53 |
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.