Origin
San Jose, CA
Late night in San Jose on Tuesday
Local time
1:08 AM
PDT
Current temp
49°F
Unavailable
Live forecast
Trip from San Jose, CA to Diamond Bar, CA
Pin this tripCompiled and reviewed by the US Trip Planner planning team at COD Solutions Oy · Last reviewed Apr 21, 2026 · Editorial standards
Drive Time
6h 55m
Distance
367.1 mi
591 km
Drive Score
8/10
Great drive
Same Day?
Yes, doable
Fuel Cost
$84
one way
EV Charging
Unknown
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
Wikimedia Commons
Diamond Bar, CA
Wikimedia Commons
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 .
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
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 straight lane.
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 straight / slight right lanes.
8
Continue on CA 87
4.1 mi
·
4 min
·
Guadalupe Parkway
Use the straight / slight right lanes.
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 straight / slight right lanes.
13
Continue on CA 85
0.4 mi
·
27 sec
·
CA 85
Exit 1A
Toward US 101 South
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
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 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 straight / slight right lanes.
21
Keep slight left at fork onto I 5
2.0 mi
·
2 min
·
Golden State Freeway
Use the straight / slight right lanes.
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 straight / slight right lanes.
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
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 straight / slight right lanes.
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.
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.
These stop ideas are pacing suggestions — the exact town or exit can change with traffic, hotel plans, and fuel range.
Heads-up: tricky spots
5 of 225 decision points cluster between mile 6.1 and 359.5 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
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
Fuel & Cost
Regular Gas
$84.38 one way
$168.75 round trip
$5.84/gal
25.4 MPG avg
128 kg CO2
| Fuel Type | $/gal | One Way | Round Trip |
|---|---|---|---|
| midgrade | $6.02 | $86.95 | $173.90 |
| premium | $6.18 | $89.27 | $178.55 |
| diesel | $5.61 | $81.05 | $162.10 |
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$84
Meals
$25–$50
Total
$109–$134
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, 2026-04-13.
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
Late night in Diamond Bar on Tuesday
Local time
1:08 AM
PDT
Current temp
67°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 warmer 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.
National Parks Near This Route
Worth a detour if your schedule allows.
Santa Monica Mountains National Recreation Area
National Recreation Area
The Santa Monica Mountains offer easy access to surprisingly wild places. Experience the famous beaches of Malibu or explore more than 500 miles of trails. The park abounds with historical and cultura...
23 mi from route
~57 min detour
Free
near mile 316.5
View on nps.gov
César E. Chávez National Monument
National Monument
Yes, we can! Widely recognized as the most important Latino leader in the United States during the twentieth century, Cesar Chavez led farm workers and supporters in the establishment of the country's...
27 mi from route
~67 min detour
Free
near mile 253.2
View on nps.gov
Park data from the National Park Service API. Alerts update every 2 hours.
What kind of drive is this?
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.
88% highway — fuel and pacing are the main things to plan.
31 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 181.1 mi on Westside Freeway.
How Hard Is This Drive?
10/10
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.
Driving Effort
10/10
High effort - long or complex enough to need steady focus all day
Balances navigation complexity with total wheel time.
This is a demanding drive. With 22 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.
Towns Mentioned on Route Signs
Based on OSRM destination-sign hints, not a full list of every settlement the road passes.
Towns Mentioned on Route Signs
Based on OSRM destination-sign hints, not a full list of every settlement the road passes.
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
About the Cities
Starting in San Jose, CA
Full guide →Founded 1777
Often called "the capital of Silicon Valley", San Jose is the largest city in the Bay Area, 3rd largest in California, and the 12th largest city in the United States, with a population of over 997,000 residents as of 2024. It was named the 6th safest big city in the U.S. in 2015. This clean, sprawling metropolis has sports, beautiful vistas, and ethnic enclaves and bleeds into the greater Bay Area for travelers who want to take their time in Northern California.
Top landmarks
- • Winchester Mystery House — Mansion in San Jose, California.
- • San Jose Diridon station — railway station complex in San Jose, California
- • Rosicrucian Egyptian Museum — building in San Jose, California, United States
Arriving in Diamond Bar, CA
Full guide →Founded 1989
Diamond Bar is a city in the San Gabriel Valley of Los Angeles in Southern California.
City content from Wikivoyage (CC BY-SA 4.0) and Wikidata (CC0).
Who Is This Route For?
Weekend Trip
Doable as a same-day drive at 6h 55m. Total distance: 367.1 miles.
Family Friendly
Moderate complexity with 1 natural rest stops along the way.
Solo Traveler
6h 55m drive, plan rest stops for pacing.
Frequently Asked Questions
The longest stretch is about 181.1 miles on Westside Freeway. The full list of main roads is in the Roads section above.
We did not find dedicated rest areas on this route. For a drive this long, plan bathroom and stretch breaks around gas stations, fast-food stops, or small-town downtowns — check the Nearby Places section for options.
It helps. This route has a higher-than-average number of complex decision points, which get harder in the dark. If the last hour of the trip is on surface roads or mountain grades, aim to arrive at Diamond Bar, CA before sunset when you can. Check the Trip Plan for departure windows that land you in daylight.
Only with planning. This is a long drive for kids — consider splitting it into two days rather than pushing through. Plan at least 1 meaningful breaks. Dedicated rest areas are limited, so plan gas or food stops as your bathroom breaks.
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.
Yes — Santa Monica Mountains National Recreation Area and César E. Chávez National Monument. See the National Parks section for detour distances and tips on detours.
Not recommended in a single day. At 6.9 hours each way, a round trip means 13.9 hours of driving — that is an unsafe level of fatigue for most drivers. Plan at least one night at Diamond Bar, CA before the return drive.
How this page is built
Compiled by the US Trip Planner planning team at COD Solutions Oy from open government datasets — OSRM over OpenStreetMap for geometry, EIA for fuel prices, and NPS for national parks. See our methodology for refresh cadence and limitations.
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