How far is San Bernardino, CA from Diamond Bar, CA?
The driving distance from San Bernardino, CA to Diamond Bar, CA is about 36.7 miles (59.1 km), with a travel time of about 00h 44m by car.
- The straight-line flight distance is about 30.3 miles (48.8 km).
- For a round trip, plan for roughly 01h 29m 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 44m.
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 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 San Bernardino and Diamond Bar.
Turn-by-Turn Driving Directions
Step-by-step road directions between San Bernardino and Diamond Bar.
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1
Start on West 5th Street
1.2 km · 2 min · West 5th Street
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2
Take the ramp left toward I 215 South: Riverside
1641 ft · 42 sec
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3
Merge slight left onto San Bernardino Freeway
2.4 mi · 3 min · San Bernardino Freeway
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4
Take the exit slight right toward I 10: Redlands, Indio, Los Angeles
1187 ft · 29 sec
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5
Keep slight right to continue on I 10 West: Los Angeles
2017 ft · 35 sec
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6
Continue on San Bernardino Freeway
13.9 mi · 16 min · San Bernardino Freeway
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7
Keep slight left to continue on I-10 Metro ExpressLanes
9.3 mi · 10 min · I-10 Metro ExpressLanes
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8
Merge slight right onto San Bernardino Freeway
1.2 mi · 1 min · San Bernardino Freeway
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9
Keep slight right to continue on San Bernardino Freeway
1.4 km · 1 min · San Bernardino Freeway
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10
Keep slight right to continue on San Bernardino Freeway
1.3 mi · 2 min · San Bernardino Freeway
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11
Keep slight right to continue on San Bernardino Freeway
1.9 mi · 2 min · San Bernardino Freeway
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12
Keep slight right to continue on San Bernardino Freeway
1.3 km · 55 sec · San Bernardino Freeway
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13
Take the exit slight right toward CA 57: Santa Ana
1086 ft · 27 sec
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14
Keep slight left to continue on CA 57 South: Santa Ana
1.5 km · 2 min
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15
Merge slight left onto Orange Freeway
2 mi · 2 min · Orange Freeway
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16
Take the exit slight right toward Sunset Crossing Road
1334 ft · 40 sec
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17
Turn left onto Sunset Crossing Road
725 ft · 25 sec · Sunset Crossing Road
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18
Turn left
12 m · 3 sec
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19
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between San Bernardino and Diamond Bar.
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
Continue on San Bernardino Freeway
13.9 mi · 00h 16m
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.
Mostly Sunny leaving San Bernardino and Mostly Sunny near Diamond Bar.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from San Bernardino to Diamond Bar?
The road trip is about 36.7 miles (59.1 km) and usually takes 00h 44m 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?
Rancho Cucamonga is a useful midpoint, sitting about 18.3 miles from San Bernardino and 18.4 miles from Diamond Bar.
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 6.4 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 7:00 PM PDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $7.50 one way or $15.00 round trip. Estimated CO2 is about 11.6 kg one way.
What should you check before leaving?
Before you leave, expect Mostly Sunny around San Bernardino and Mostly Sunny near Diamond Bar.
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 San Bernardino and Diamond Bar. Straight-line distance: 30.3 mi (48.76 km).
#1 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 |
#2 Diamond Bar
A city in Los Angeles County, California.
| Population | 54,880 |
| Coordinates | 34.0286200, -117.8103400 |
| Altitude | 212 |
| Country | United States |
End: Diamond Bar (-117.81034, 34.02862)
Estimated Travel Time
Distance: 59 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 01h 13m |
| 40 mph (64.37 km/h) | 00h 55m |
| 50 mph (80.47 km/h) | 00h 44m |
| 60 mph (96.56 km/h) | 00h 36m |
| 70 mph (112.65 km/h) | 00h 31m |
| 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 | $7.50 | $15.00 |
| Mid-grade | $6.07 | $7.89 | $15.77 |
| Premium | $6.24 | $8.12 | $16.23 |
| Diesel | $7.57 | $9.84 | $19.67 |
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.