How far is Diamond Bar, CA from San Bernardino, CA?
The driving distance from Diamond Bar, CA to San Bernardino, CA is about 37.4 miles (60.2 km), with a travel time of about 00h 46m by car.
- The straight-line flight distance is about 30.3 miles (48.8 km).
- For a round trip, plan for roughly 01h 32m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 8:00 AM to 10:00 AM PDT.
Reverse, save, or send this route
This route works well as a day trip with time at the destination. Copy the route link, send it to another device, or print a clean version before you head out.
This route works well as a day trip with time at the destination.
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 46m.
A morning start gives you useful time at the destination and keeps the return out of the late evening.
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 sixth most populous city in San Bernardino County, California.
Route Weather Snapshot
Check the forecast at both ends before you head out.
Mostly Sunny
Mostly Sunny
Driving Route Map
The map below follows the saved road route between Diamond Bar and San Bernardino.
Turn-by-Turn Driving Directions
Step-by-step road directions between Diamond Bar and San Bernardino.
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1
Start on the route
10 m · 5 sec
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2
Turn left
26 m · 9 sec
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3
Turn right onto North Diamond Bar Boulevard
600 ft · 20 sec · North Diamond Bar Boulevard
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4
Take the ramp left toward CA 57 North
1251 ft · 31 sec
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5
Continue on Orange Freeway
1.8 mi · 2 min · Orange Freeway
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6
Take the exit slight right toward I 10 West, I 10 East: Los Angeles, San Bernardino, Ontario Airport
1093 ft · 27 sec
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7
Keep slight right to continue on I 10 East: San Bernardino Freeway, San Bernardino
2484 ft · 1 min
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8
Merge slight left onto San Bernardino Freeway
2.1 mi · 2 min · San Bernardino Freeway
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9
Keep slight right to continue on San Bernardino Freeway
4 mi · 5 min · San Bernardino Freeway
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10
Keep slight left to continue on I-10 Metro ExpressLanes
9 mi · 10 min · I-10 Metro ExpressLanes
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11
Merge slight right onto San Bernardino Freeway
14.3 mi · 16 min · San Bernardino Freeway
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12
Take the exit slight right toward I 215: Riverside, San Bernardino, Barstow
952 ft · 23 sec
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13
Keep slight left to continue on I 215 North: San Bernardino, Barstow
1.5 km · 2 min
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14
Merge slight left onto San Bernardino Freeway
2.3 mi · 3 min · San Bernardino Freeway
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15
Take the exit slight right toward 5th Street, Civic Center
1510 ft · 42 sec
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16
Turn right onto West 5th Street
1.1 km · 1 min · West 5th Street
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17
Arrive at your destination
0 m · 1 sec · West 5th Street
Car Route Details
A richer read on the saved driving route between Diamond Bar and San Bernardino.
Highway-focused drive
Most of the mileage stays on named highways, so the important moments are ramps, exits, merges, and the final local approach.
San Bernardino Freeway
Merge slight right onto San Bernardino Freeway
14.3 mi · 00h 16m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A comfortable day-trip route
This route works well as a day trip. You can leave in the morning, spend meaningful time at the destination, and still return the same day.
Mostly Sunny leaving Diamond Bar and Mostly Sunny near San Bernardino.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Diamond Bar to San Bernardino?
The road trip is about 37.4 miles (60.2 km) and usually takes 00h 46m in normal driving conditions.
Is this a same-day trip or an overnight route?
This route works well as a day trip. You can leave in the morning, spend meaningful time at the destination, and still return the same day.
What is the halfway point on this route?
Rancho Cucamonga is a useful midpoint, sitting about 18.3 miles from Diamond Bar and 19.1 miles from San Bernardino.
How much longer is the road route than the straight-line distance?
The direct path is about 30.3 miles (48.8 km), while the road route adds roughly 7.1 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 8:00 AM to 10:00 AM PDT. If you want a more comfortable same-day return, try to leave by 4:58 PM PDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $7.62 one way or $15.23 round trip. Estimated CO2 is about 11.7 kg one way.
What should you check before leaving?
Before you leave, expect Mostly Sunny around Diamond Bar and Mostly Sunny near San Bernardino.
Stop Ideas Near Rancho Cucamonga
Useful break, food, and waypoint ideas within about 15 miles of the route midpoint.
Ayres Hotel Chino Hills
City Hall
Chino City Hall
Jurupa Valley City Hall
Transit and Meeting Points
Useful pickup, handoff, or rendezvous points close to Rancho Cucamonga.
Ontario
Claremont, California
Pomona station
Riverside–Downtown
Flight Path Map
This map shows the direct air route between Diamond Bar and San Bernardino. Straight-line distance: 30.3 mi (48.76 km).
#1 Diamond Bar
A city in Los Angeles County, California.
| Population | 54,880 |
| Coordinates | 34.0286200, -117.8103400 |
| Altitude | 212 |
| Country | United States |
#2 San Bernardino
The second most populous city in San Bernardino County, California.
| Population | 217,491 |
| Coordinates | 34.1083400, -117.2897700 |
| Altitude | 321 |
| Country | United States |
End: West 5th Street (-117.289794, 34.108326)
Estimated Travel Time
Distance: 60 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 01h 14m |
| 40 mph (64.37 km/h) | 00h 56m |
| 50 mph (80.47 km/h) | 00h 44m |
| 60 mph (96.56 km/h) | 00h 37m |
| 70 mph (112.65 km/h) | 00h 32m |
| 80 mph (129 km/h) | 00h 27m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $5.77 | $7.62 | $15.23 |
| Mid-grade | $6.07 | $8.01 | $16.01 |
| Premium | $6.24 | $8.24 | $16.48 |
| Diesel | $7.57 | $9.99 | $19.98 |
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 19, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.