Origin
San Jose, CA
Afternoon in San Jose on Sunday
Local time
1:34 PM
PDT
Current temp
71°F
Unavailable
Live forecast
Trip from San Jose, CA to Diamond Bar, CA
Drive Time
6h 55m
Distance
367.1 mi
591 km
Drive Score
8/10
Great drive
Same Day?
Yes, doable
Fuel Cost
$85
one way
EV Charging
Loading...
station data
Best Time to Leave
4 AM
6h 44m
★
6 AM
6h 56m
8 AM
7h 19m
10 AM
7h 4m
12 PM
7h 2m
3 PM
7h 5m
5 PM
7h 18m
8 PM
6h 49m
Estimated drive times based on typical traffic patterns. Actual times may vary with weather, construction, and real-time conditions.
San Jose, CA
Stephen Leonardi
Diamond Bar, CA
Lany-Jade Mondou
Trip Overview
Driving from San Jose to Diamond Bar covers 367.1 miles, typically requiring about 6 hours and 55 minutes of time behind the wheel. Because this journey is manageable in a single day, you can complete the trip without an overnight stay if you are comfortable with a full day of driving. Expect to budget roughly $85 for fuel to get you from the Pacific Coast regions of Northern California down to the Los Angeles area. The path utilizes a combination of the Westside Freeway, I-5 Truck, and the Foothill Freeway to navigate the state efficiently. This is a practical, direct route designed for those who need to reach their destination quickly rather than taking a scenic detour.
Trip Pace
Same-day drive is realistic
A same-day return is possible, but it will make for a full day on the road.
Break Rhythm
1 planned break
Plan on a short reset every 3 to 4 hours to stay fresh behind the wheel.
Midpoint
183.5 miles from San Jose, CA
A natural place for your longest stop of the day , about 3h 28m into the drive .
Drive Character
This trip is a highway-focused drive, with 88% of your journey spent on high-speed roads. You will settle into a steady rhythm on the Westside Freeway, which accounts for the longest uninterrupted stretch of 181.1 miles. While the experience is primarily a consistent interstate grind, the road conditions shift as you transition between major freeways. Staying focused is essential during the long, straight segments that define the majority of your time on the road. By the time you reach the Foothill Freeway, you will notice the character of the drive changing as you approach the denser traffic patterns of your destination.
Most of the miles stay on highways, which makes pacing and fuel planning easier than turn-by-turn city driving.
There are about 31 navigation steps in the underlying route data, so the final approach matters more than the middle miles.
Westside Freeway is the longest continuous segment at about 181.1 miles.
How Hard Is This Drive?
This is a straightforward highway drive that stays mostly on Westside Freeway and I 5 Truck. This route has several spots where lane changes, forks, or exits need your full attention. The trickiest moment comes around 6.1 miles in.
Route Complexity
10/10
High effort - long or complex enough to need steady focus all day
This is a demanding drive. With 23 significant decision points across 367.1 miles, you will need to stay alert — especially through interchange areas and urban stretches. Consider splitting it into segments if you are not comfortable with fast highway navigation.
Where does it get tricky?
The main spots that need attention: at 6.1 miles: Exit ramp - move to the correct lane early. Lane positioning matters here; at 6.6 miles: Lane positioning matters here; at 315.3 miles: Exit ramp - move to the correct lane early. Lane positioning matters here.
Critical Maneuvers
5 of 23 key pointsThese are the spots where you need to pay the most attention. Preview them before you drive.
7
6.1 mi into trip
|
~8m in
Take the exit toward Santa Teresa Boulevard
Exit ramp - move to the correct lane early. Lane positioning matters here
Use the straight / slight right lanes.
Exit 1C
Toward Santa Teresa Boulevard
8
6.6 mi into trip
|
~8m in
Turn left toward CA 85 South
Lane positioning matters here
Use the left lane.
Toward CA 85 South
7
315.3 mi into trip
|
~5h 54m in
Take the exit toward I 210 East: Pasadena
Exit ramp - move to the correct lane early. Lane positioning matters here
Use the slight right lane.
Exit 161A
Toward I 210 East: Pasadena
8
340 mi into trip
|
~6h 22m in
|
I 210 / Foothill Freeway
Keep slight right at fork onto I 210 / Foothill Freeway toward CA 134 West, I 210 East: San Bernardino, Ventura
Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one
Use the slight right lane.
Toward CA 134 West, I 210 East: San Bernardino,...
7
359.5 mi into trip
|
~6h 45m in
Take the exit toward CA 57 South: Santa Ana
Exit ramp - move to the correct lane early. Lane positioning matters here
Use the slight right lane.
Exit 44A
Toward CA 57 South: Santa Ana
Towns Along This Route
On the drive from San Jose, CA to Diamond Bar, CA, road signs begin pointing toward Ventura along the way.
Ventura
340 mi in
|
~6h 22m
|
via I 210
Main Roads
| Road | Distance | Duration |
|---|---|---|
| Westside Freeway | 181.1 mi | 3h 14m |
| I 5 Truck | 58.4 mi | 1h 6m |
| Foothill Freeway | 44 mi | 50m |
| Pacheco Pass Highway | 40.6 mi | 50m |
| US 101 | 20.3 mi | 23m |
| Orange Freeway | 6.3 mi | 7m |
| CA 85 | 5.1 mi | 5m |
| Guadalupe Parkway | 4.1 mi | 4m |
Longest stretch:
Westside Freeway
— 181.1 mi, about 3h 14m
Turn-by-Turn Driving Directions
Step-by-step road directions between San Jose, CA and Diamond Bar, CA.
1
Start on North Market Street
110 ft
·
5 sec
·
North Market Street
2
Turn right onto Devine Street
275 ft
·
17 sec
·
Devine Street
Use the none lane.
3
Turn left onto North San Pedro Street
306 ft
·
17 sec
·
North San Pedro Street
4
Turn right onto West Saint James Street
0.1 mi
·
16 sec
·
West Saint James Street
5
Continue on West Julian Street
356 ft
·
7 sec
·
West Julian Street
Use the none / straight lanes.
6
Take the ramp
0.2 mi
·
31 sec
Toward CA 87 South
Use the right lane.
7
Merge onto CA 87
1.4 mi
·
1 min
·
Guadalupe Freeway
Use the none lane.
8
Continue on CA 87
4.1 mi
·
4 min
·
Guadalupe Parkway
Use the none lane.
9
Take the exit
0.4 mi
·
30 sec
Exit 1C
Toward Santa Teresa Boulevard
Use the straight / slight right lanes.
10
Continue on CA 87
0.1 mi
·
22 sec
·
Santa Teresa Boulevard
Use the straight lane.
11
Turn left
0.3 mi
·
41 sec
Toward CA 85 South
Use the left lane.
12
Merge onto CA 85
4.7 mi
·
5 min
·
CA 85
Use the none / straight / slight right lanes.
13
Continue on CA 85
0.4 mi
·
27 sec
·
CA 85
Exit 1A
Toward US 101 South
Use the none lane.
14
Continue on US 101
20 mi
·
23 min
·
US 101
15
Take the exit onto CA 152
0.3 mi
·
39 sec
·
CA 152
Toward CA 152 East: 10th Street, Pacheco Pass Road
16
Turn left onto CA 152
353 ft
·
12 sec
·
East 10th Street
17
Continue on CA 152
41 mi
·
50 min
·
Pacheco Pass Highway
Use the none lane.
18
Take the exit
0.6 mi
·
1 min
Toward I 5: Los Angeles
19
Merge onto I 5
181 mi
·
3 hr 14 min
·
Westside Freeway
Use the none / straight / slight right lanes.
20
Keep slight right at fork onto I 5 Truck
58 mi
·
1 hr 6 min
·
I 5 Truck
Use the none / straight / slight right lanes.
21
Keep slight left at fork onto I 5
2.0 mi
·
2 min
·
Golden State Freeway
Use the none lane.
22
Take the exit
0.3 mi
·
17 sec
Exit 161A
Toward I 210 East: Pasadena
Use the slight right lane.
23
Continue on I 210
24 mi
·
28 min
·
Foothill Freeway
Use the none lane.
24
Keep slight right at fork onto I 210
19 mi
·
22 min
·
Foothill Freeway
Toward CA 134 West, I 210 East: San Bernardino, Ventura
Use the slight right lane.
25
Keep slight right at fork onto I 210
0.5 mi
·
32 sec
·
Foothill Freeway
Use the none lane.
26
Take the exit
0.9 mi
·
1 min
Exit 44A
Toward CA 57 South: Santa Ana
Use the slight right lane.
27
Continue on CA 57
6.3 mi
·
7 min
·
Orange Freeway
Use the none lane.
28
Take the exit
0.3 mi
·
40 sec
Exit 18
Toward Sunset Crossing Road
Use the straight / slight right lanes.
29
Turn left onto Sunset Crossing Road
0.1 mi
·
24 sec
·
Sunset Crossing Road
Use the left lane.
30
Turn left
39 ft
·
2 sec
31
Arrive at destination
Trip Plan
To make the most of your 6-hour and 55-minute journey, plan for at least one dedicated stop to stretch your legs and refresh. Leaving early in the morning is your best strategy to avoid the peak congestion often found near major urban hubs like San Jose and Diamond Bar. Keep a close eye on your fuel gauge during the 181.1-mile stretch on the Westside Freeway, as services can be spaced out along those rural highway sections. Since this is a straightforward one-day trip, having a flexible departure time allows you to navigate the freeways when they are at their least busy. Prioritize your comfort by keeping your vehicle's maintenance in check before embarking on this long-distance trek.
Morning Departure
Start early — leave by 6-7 AM to arrive at a reasonable hour.
Evening Departure
This is a long drive — plan for a morning departure or consider splitting it into two days.
You can normally do this drive in one day.
Plan roughly 1 meaningful break for fuel, food, and rest.
The halfway point lands around 183.5 miles from San Jose, CA, or about 3h 28m into the drive.
The longest continuous stretch on this route runs about 181.1 miles.
This is a comfortable same-day trip.
Departure
Before you leave
Start with fuel, water, and navigation already sorted so the first hour feels easy.
First stop
Around 81 miles or 1h 38m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 183.5 miles or 3h 28m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Final approach
Final hour starts around 5h 44m
Traffic, exits, and arrival timing usually matter more near Diamond Bar, CA than in the middle of the route.
Before You Leave
+
Open the route before leaving San Jose, CA so your first major turns are already loaded.
+
Leave with enough water and a charging cable within reach, not packed away.
+
Check your fuel range against the first long segment, especially if you are starting outside city service areas.
Day 1
Settle into the route from San Jose, CA
This is one driving day of about 367.1 miles and 6h 55m.
Your first comfortable stop window is around 81 miles from San Jose, CA.
This route can stay practical as a one-day drive if traffic stays reasonable.
Plan about 1 real break rather than only quick fuel stops.
The longest stretch is on Westside Freeway for about 181.1 miles.
Where to Stop
Rest stops, refuel points, and overnight suggestions along this route.
Halfway Point
Midpoint
About 183.5 mi from San Jose, CA · 3h 28m into the drive
Mid-route town
Meal stop
184 mi into the route
Best for: Lunch, fuel, and a longer reset
This sits close to the middle of the route, so it works well for the longest stop of the day.
Pacing Suggestions
Fuel and coffee
A short stop after about 81 miles helps settle the day before fatigue starts building.
Meal break
The midpoint is around 183.5 miles from San Jose, CA, which is a good place for a longer meal and fuel stop.
Before the longest stretch
Fuel checkTop up before Westside Freeway if your tank is already low. That segment runs about 181.1 miles.
Arriving in Diamond Bar, CA
The final approach into Diamond Bar, CA usually feels slower than the middle of the drive, so avoid planning your tightest schedule at the very end.
Try to arrive with enough fuel left to skip an immediate station stop unless you already know the area around Diamond Bar, CA.
After long uninterrupted mileage, take five minutes before the last urban segment to reset and refocus on exits, merges, and city traffic.
These stop ideas are pacing suggestions — the exact town or exit can change with traffic, hotel plans, and fuel range.
Fuel & Cost
Regular Gas
$85.01 one way
$170.02 round trip
$5.88/gal
25.4 MPG avg
128 kg CO2
| Fuel Type | $/gal | One Way | Round Trip |
|---|---|---|---|
| midgrade | $6.07 | $87.67 | $175.34 |
| premium | $6.24 | $90.23 | $180.46 |
| diesel | $5.64 | $81.56 | $163.11 |
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$85
Meals
$25–$50
Total
$110–$135
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 128.4 kg one way. Prices: EIA weekly data, 2026-04-06.
Driving Electric?
About $39 in charging · 1 stop · 66% less CO2
| Vehicle Type | kWh | Stops | DC Fast | Home Charge |
|---|---|---|---|---|
| Average EV | 110.1 | 1 | $38.55 | $17.62 |
| Efficient EV | 91.8 | 1 | $32.12 | $14.68 |
| EV Truck/SUV | 146.8 | 1 | $51.39 | $23.49 |
Gas CO2
128 kg
EV CO2
43 kg (66% less)
Plan for 1 charging stop. A 30-minute DC fast charge mid-route should be enough to complete the trip comfortably.
DC fast charging avg $0.35/kWh. Home charging avg $0.16/kWh. US grid CO2: 0.39 kg/kWh.
Travel Intel
Current conditions at both ends of the drive.
Destination
Diamond Bar, CA
Afternoon in Diamond Bar on Sunday
Local time
1:34 PM
PDT
Current temp
53°F
Unavailable
Live forecast
Seasonal Notes
Summer travel usually means heavier construction, hotter rest stops, and busier weekend traffic around major cities.
Winter travel shortens daylight, so a route that looks manageable on paper can feel much longer after dark.
Holiday weekends tend to make both departure and arrival windows slower than the raw route time suggests.
Time zone
Same local time
Origin and destination are on the same clock, so arrival timing is easier to judge at a glance.
Temperature spread
18 degrees cooler at arrival
A meaningful temperature swing is a good cue to rethink layers, water, and how soon you want to arrive.
Road read
6h 55m on the road
Start early — leave by 6-7 AM to arrive at a reasonable hour.
Weather data from the National Weather Service. Conditions may change; check closer to your travel date.
Frequently Asked Questions
The drive from San Jose, CA to Diamond Bar, CA covers 367.1 miles and takes about 6h 55m without stops. Add 15-30 minutes for a fuel or rest stop on longer drives.
The main roads are Westside Freeway, I 5 Truck, Foothill Freeway. Most of the drive stays on highways, so watch for ramps and exits.
This is a comfortable same-day trip.
The midpoint is about 183.5 miles from San Jose, CA. Look for rest areas, gas stations, or food options near the halfway mark.
At current regular gas prices, expect to spend about $85.01 one way. This estimate uses 25.4 MPG — your actual cost will vary with your vehicle's fuel efficiency and current gas prices.
Start early — leave by 6-7 AM to arrive at a reasonable hour. This is a long drive — plan for a morning departure or consider splitting it into two days.
Plan about 1 meaningful break for fuel, food, or rest. Plan on a short reset every 3 to 4 hours to stay fresh behind the wheel.
This is a demanding drive. With 23 significant decision points across 367.1 miles, you will need to stay alert — especially through interchange areas and urban stretches. Consider splitting it into segments if you are not comfortable with fast highway navigation.
The main spots that need attention: at 6.1 miles: Exit ramp - move to the correct lane early. Lane positioning matters here; at 6.6 miles: Lane positioning matters here; at 315.3 miles: Exit ramp - move to the correct lane early. Lane positioning matters here.
On the drive from San Jose, CA to Diamond Bar, CA, road signs begin pointing toward Ventura along the way.
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