Compiled and reviewed by the US Trip Planner planning team at COD Solutions Oy · Last reviewed Apr 21, 2026 · Editorial standards
Drive Time
7h 22m
Distance
396.9 mi
639 km
Drive Score
8/10
Great drive
Same Day?
Yes, doable
Fuel Cost
$91
one way
EV Charging
Unknown
Estimated drive times based on typical traffic patterns. Actual times may vary with weather, construction, and real-time conditions.
Oakland, CA
Wikimedia Commons
Diamond Bar, CA
Wikimedia Commons
Traveling from Oakland to Diamond Bar covers 396.9 miles, typically taking about 7 hours and 22 minutes of pure drive time. Because this route is almost entirely highway-focused, you can comfortably complete the journey in a single day if you stay focused. Expect to budget roughly $92 for fuel to make the trip between these two Pacific Coast locations. While the drive is straightforward, the long duration means it can be taxing, so plan for at least two deliberate stops to keep your energy levels up. It is a practical, direct transit route rather than a leisurely sightseeing tour, making it ideal for when you need to get from Northern to Southern California efficiently.
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
2 planned breaks
Plan on a short reset every 3 to 4 hours to stay fresh behind the wheel.
Midpoint
198.4 miles from Oakland, CA
A natural place for your longest stop of the day , about 3h 39m into the drive .
| Road | Distance | Duration |
|---|---|---|
| Westside Freeway | 224.4 mi | 4h |
| I 5 Truck | 58.4 mi | 1h 6m |
| Foothill Freeway | 44 mi | 50m |
| Arthur H. Breed Junior Freeway | 30.2 mi | 34m |
| William Elton Brown Freeway | 17 mi | 18m |
| Nimitz Freeway | 9.7 mi | 11m |
| Orange Freeway | 6.3 mi | 7m |
| Golden State Freeway | 2 mi | 2m |
Step-by-step road directions between Oakland, CA and Diamond Bar, CA.
Start on 14th Street
Turn right onto Harrison Street
Turn left onto 11th Street
Turn right onto Madison Street
Turn left onto 5th Street
Take the ramp
Merge onto I 880
Take the exit
Keep slight left at fork
Continue on I 238
Continue on I 580
Keep slight right at fork onto I 580
Keep slight right at fork onto I 580
Keep slight left at fork onto I 580
Merge onto I 5
Keep slight right at fork onto I 5 Truck
Keep slight left at fork onto I 5
Take the exit
Continue on I 210
Keep slight right at fork onto I 210
Keep slight right at fork onto I 210
Take the exit
Continue on CA 57
Take the exit
Turn left onto Sunset Crossing Road
Turn left
Arrive at destination
To manage the 7h 22m duration effectively, aim for an early morning departure to navigate through traffic zones before they peak. Since you are facing a long haul, space your two recommended stops evenly to avoid fatigue, particularly during the lengthy 224.4-mile Westside Freeway stretch. Keep an eye on your dashboard gauges as you navigate this high-speed corridor, as consistent highway speeds will impact your fuel consumption. Always check traffic reports before getting on the Foothill Freeway, as congestion can fluctuate significantly upon your approach to Diamond Bar. Being prepared for a long day behind the wheel is your best strategy for a smooth arrival.
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.
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 87 miles or 1h 39m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 198.4 miles or 3h 39m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Final approach
Final hour starts around 6h 11m
Traffic, exits, and arrival timing usually matter more near Diamond Bar, CA than in the middle of the route.
Open the route before leaving Oakland, 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.
Pick one backup stop option before the midpoint in case traffic changes your pacing.
Day 1
Settle into the route from Oakland, CA
This is one driving day of about 396.9 miles and 7h 22m.
Rest stops, refuel points, and overnight suggestions along this route.
Mid-route town
Meal stop
198 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.
A short stop after about 87 miles helps settle the day before fatigue starts building.
The midpoint is around 198.4 miles from Oakland, 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 224.4 miles.
These stop ideas are pacing suggestions — the exact town or exit can change with traffic, hotel plans, and fuel range.
5 decision points cluster between mile 0.4 and 369.8 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
Turn left onto 11th Street
Lane positioning matters here
Take the exit toward I 238: Castro Valley, Stockton
Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one
Keep slight left at fork toward I 238: Stockton Fresno
Highway fork - watch signs carefully. Lane positioning matters here
Take the exit toward I 210 East: Pasadena
Exit ramp - move to the correct lane early. Lane positioning matters here
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
Regular Gas
$91.22 one way
$182.45 round trip
| Fuel Type | $/gal | One Way | Round Trip |
|---|---|---|---|
| midgrade | $6.02 | $94.01 | $188.01 |
| premium | $6.18 | $96.52 | $193.04 |
| diesel | $5.61 | $87.63 | $175.26 |
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$91
Meals
$25–$50
Total
$116–$141
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 138.9 kg one way. Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $42 in charging · 1 stop · 67% less CO2
| Vehicle Type | kWh | Stops | DC Fast | Home Charge |
|---|---|---|---|---|
| Average EV | 119.1 | 1 | $41.67 | $19.05 |
| Efficient EV | 99.2 | 1 | $34.73 | $15.88 |
| EV Truck/SUV | 158.8 | 1 | $55.57 | $25.40 |
Gas CO2
139 kg
EV CO2
46 kg (67% 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.
Current conditions at both ends of the drive.
Origin
Morning in Oakland on Tuesday
Local time
10:09 AM
PDT
Current temp
72°F
Sunny
Destination
Morning in Diamond Bar on Tuesday
Local time
10:09 AM
PDT
Current temp
67°F
Unavailable
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
Origin and destination are on the same clock, so arrival timing is easier to judge at a glance.
Temperature spread
A meaningful temperature swing is a good cue to rethink layers, water, and how soon you want to arrive.
Road read
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.
Worth a detour if your schedule allows.
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Expect a high-speed, interstate-heavy experience with 99% of your time spent on major highways like the Westside Freeway, I-5, and the Foothill Freeway. You will encounter a significant stretch of open road, specifically a 224.4-mile segment on the Westside Freeway that serves as the backbone of your journey. The personality of this drive is defined by its efficiency and consistent pace, prioritizing speed over technical or winding mountain passes. While the landscape remains wide and expansive for most of the trip, the transition onto the Foothill Freeway signals your arrival into the more densely populated Southern California road network. It is a classic, predictable interstate grind that demands steady focus.
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 0.4 miles in near 11th Street.
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 23 significant decision points across 396.9 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 0.4 miles (11th Street): Lane positioning matters here; at 10.9 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one; at 11.1 miles: Highway fork - watch signs carefully. Lane positioning matters here.
Based on OSRM destination-sign hints, not a full list of every settlement the road passes.
On the drive from Oakland, CA to Diamond Bar, CA, road signs begin pointing toward Ventura along the way.
Ventura
Founded 1852
Oakland is a port city in the Bay Area of California in the United States. Once an industrial area overshadowed by San Francisco, its larger neighbor to the west, this city of 440,000 people (2020) has begun to step out from under San Francisco's shadow with its notable natural and architectural features and its rise as the multicultural "hipster" city of the Bay Area.
Top landmarks
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).
Weekend Trip
Doable as a same-day drive at 7h 22m. Total distance: 396.9 miles.
Family Friendly
Moderate complexity with 2 natural rest stops along the way.
Solo Traveler
7h 22m drive, plan rest stops for pacing.
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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