Stretching 396.9 miles from Diamond Bar to Oakland, this route connects two major hubs within the Pacific Coast region. You should plan for a driving time of approximately 7 hours and 21 minutes, making it a manageable, albeit long, day trip for most travelers. With 99% of your journey spent on highways, the drive is highly efficient and straightforward. Budgeting around $92 for fuel is a smart move to keep your finances in check before you head out. While it can be tackled in a single day, breaking the trip up with two planned stops will help you stay alert behind the wheel. Ultimately, this is a practical transit route designed for those who want to reach Northern California from Southern California as directly as possible.
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
198.5 miles from Diamond Bar, CA
A natural place for your longest stop of the day
, about 3h 43m into the drive
.
Main Roads
Road
Distance
Duration
Westside Freeway
225.6 mi
4h 1m
Foothill Freeway
43.9 mi
50m
I 5 Truck
37.1 mi
42m
Arthur H. Breed Junior Freeway
29.6 mi
34m
Golden State Freeway
22.3 mi
25m
William Elton Brown Freeway
17 mi
18m
Nimitz Freeway
9.8 mi
11m
Orange Freeway
6.1 mi
7m
Longest stretch:
Westside Freeway
— 225.6 mi, about 4h 1m
Turn-by-Turn Driving Directions
Step-by-step road directions between Diamond Bar, CA and Oakland, CA.
1
Start on this road
33 ft·4 sec·this road
2
Turn left
84 ft·8 sec
3
Turn right onto North Diamond Bar Boulevard
0.1 mi·19 sec·North Diamond Bar Boulevard
4
Take the ramp
0.2 mi·30 sec
Toward CA 57 NorthUse the left lane.
5
Continue on CA 57
6.1 mi·7 min·Orange Freeway
Use the straight / slight right lanes.
6
Keep slight left at fork
1.1 mi·2 min
Exit 25CToward I 210 West: Pasadena
7
Merge onto I 210
18 mi·21 min·Foothill Freeway
Use the straight / slight right lanes.
8
Keep slight right at fork onto I 210
26 mi·29 min·Foothill Freeway
Exit 26AToward I 210 West: SacramentoUse the straight / slight right lanes.
9
Keep slight right at fork
0.1 mi·9 sec
Use the slight right lane.
10
Merge onto I 5 Truck
1.0 mi·1 min·I 5 Truck
Exit 161A
11
Keep slight left at fork onto I 5 Truck
36 mi·41 min·I 5 Truck
Use the straight / slight right lanes.
12
Keep slight left at fork onto I 5
22 mi·25 min·Golden State Freeway
Use the straight / slight right lanes.
13
Keep slight right at fork onto I 5
226 mi·4 hr 1 min·Westside Freeway
Toward I 5 NorthUse the straight / slight right lanes.
14
Keep slight left at fork onto I 580
16 mi·17 min·William Elton Brown Freeway
Toward I 580 West: Tracy, San Francisco
15
Keep slight right at fork onto I 580 Bypass
1.1 mi·1 min·William Elton Brown Freeway
16
Merge onto I 580
18 mi·20 min·Arthur H. Breed Junior Freeway
Use the straight / slight right lanes.
17
Keep slight right at fork onto I 580
12 mi·13 min·Arthur H. Breed Junior Freeway
Use the straight / slight right lanes.
18
Keep slight left at fork onto I 238
2.4 mi·2 min·Castro Valley Freeway
Exit 34Toward I 238Use the slight left / slight right lanes.
19
Keep slight left at fork
0.4 mi·52 sec
Toward I 880 NorthUse the straight / slight right lanes.
20
Merge onto I 880
9.8 mi·11 min·Nimitz Freeway
Use the straight / slight right lanes.
21
Take the exit
0.2 mi·32 sec
Exit 41AToward Oak Street, Lakeside DriveUse the straight / slight right lanes.
22
Turn right onto Oak Street
0.3 mi·49 sec·Oak Street
Use the straight / right lanes.
23
Turn left onto 12th Street
0.3 mi·45 sec·12th Street
Use the straight lane.
24
Turn right onto Harrison Street
0.1 mi·24 sec·Harrison Street
Use the right lane.
25
Turn left onto 14th Street
0.2 mi·48 sec·14th Street
26
Arrive at destination
14th Street
Trip Plan
To make the most of your 7-hour and 21-minute journey, aim to depart early in the morning to avoid peak congestion near your starting point. Incorporating at least two stops into your itinerary is essential for maintaining energy levels during such a long stint on the highway. Since the route relies heavily on major freeways, keep an eye on traffic reports for the I-5 corridor, as these high-traffic arteries can experience sudden delays. Given the $92 fuel estimate, consider topping off your tank before leaving Diamond Bar to ensure you aren't forced into high-priced stops mid-route. Flexibility is your best asset here, so don't hesitate to extend your two planned breaks if the 225.6-mile stretch on the Westside Freeway begins to wear on you.
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 2 meaningful breaks for fuel, food, and rest.
The halfway point lands around 198.5 miles from Diamond Bar, CA, or about 3h 43m into the drive.
The longest continuous stretch on this route runs about 225.6 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 87 miles or 1h 42m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 198.5 miles or 3h 43m 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 Oakland, CA than in the middle of the route.
Before You Leave
+
Open the route before leaving Diamond Bar, 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 Diamond Bar, CA
This is one driving day of about 396.9 miles and 7h 21m.
Your first comfortable stop window is around 87 miles from Diamond Bar, CA.
This route can stay practical as a one-day drive if traffic stays reasonable.
Plan about 2 real breaks rather than only quick fuel stops.
The longest stretch is on Westside Freeway for about 225.6 miles.
Where to Stop
Rest stops, refuel points, and overnight suggestions along this route.
Place data sourced from public business listings. Hours and availability may vary.
Heads-up: tricky spots
5 of 23
5 decision points cluster between mile 0.1 and 395.8 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
7
0.1 mi into trip|~0m in
Take the ramp toward CA 57 North
Lane positioning matters here
Use the left lane.
Toward CA 57 North
8
25.9 mi into trip|~31m in|I 210 / Foothill Freeway
Keep slight right at fork onto I 210 / Foothill Freeway toward I 210 West: Sacramento
Highway fork - watch signs carefully. Lane positioning matters here
Use the straight / slight right lanes.
Exit 26A
Toward I 210 West: Sacramento
7
111 mi into trip|~2h 9m in|I 5 / Westside Freeway
Keep slight right at fork onto I 5 / Westside Freeway toward I 5 North
Highway fork - watch signs carefully. Lane positioning matters here
Use the straight / slight right lanes.
Toward I 5 North
8
383.2 mi into trip|~7h 3m in|I 238 / Castro Valley Freeway
Keep slight left at fork onto I 238 / Castro Valley Freeway toward I 238
Highway fork - watch signs carefully. Lane positioning matters here
Use the slight left / slight right lanes.
Exit 34
Toward I 238
8
395.8 mi into trip|~7h 17m in
Take the exit toward Oak Street, Lakeside Drive
Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one
Use the straight / slight right lanes.
Exit 41A
Toward Oak Street, Lakeside Drive
Fuel & Cost
Regular Gas
$91.22 one way
$182.45 round trip
$5.84/gal25.4 MPG avg139 kg CO2
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.
Travel Intel
Current conditions at both ends of the drive.
Forecast as of Apr 18, 2026
Origin
Diamond Bar, CA
Morning
in Diamond Bar on Sunday
Local time
10:26 AM
PDT
Current temp
84°F
Sunny
ESE 5 to 10 mph0% chanceLive forecast
Freeze Warning
Freeze Warning issued April 18 at 1:22AM PDT until April 18 at 8:00AM PDT by NWS Eureka CA
Destination
Oakland, CA
Morning
in Oakland on Sunday
Local time
10:26 AM
PDT
Current temp
75°F
Mostly Sunny
SW 1 to 5 mph0% chanceLive forecast
Freeze Warning
Freeze Warning issued April 18 at 1:22AM PDT until April 18 at 8:00AM PDT by NWS Eureka CA
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
9 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
7h 21m 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.
San Francisco Maritime National Historical Park
National Historical Park
Established in 1988, San Francisco Maritime National Historical Park celebrates America’s maritime heritage on the Pacific Coast. Our 50-acre park has grown around Aquatic Park Cove, a protected area...
8 mi from route
~21 min detour
Free
near mile 396.9
Rosie the Riveter WWII Home Front National Historical Park
National Historical Park
Celebrate and honor the contributions and sacrifices of American civilians on the WWII home front. Discover how diverse communities lived, worked, and interacted. Many faces, many stories, many truths...
9 mi from route
~22 min detour
Free
near mile 396.9
Experience a park so rich it supports 19 distinct ecosystems with over 2,000 plant and animal species. Go for a hike, enjoy a vista, have a picnic or learn about the centuries of overlapping history f...
18 mi from route
~46 min detour
Free
near mile 396.9
Walk among old growth coast redwoods, cooling their roots in the fresh water of Redwood Creek and lifting their crowns to reach the sun and fog. Federally protected as a National Monument since 1908,...
18 mi from route
~45 min detour
$15
near mile 396.9
On July 17, 1944, a massive explosion jolted the San Francisco East Bay area, shattering windows and lighting up the night sky. At Port Chicago Naval Magazine, 320 men were killed instantly when two s...
22 mi from route
~55 min detour
Free
near mile 396.9
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...
22 mi from route
~55 min detour
Free
near mile 54.7
Park data from the National Park Service API. Alerts update every 2 hours.
More Details
What kind of drive is this?
Expect a focused, highway-centric experience where 99% of your time is spent on major transit corridors like the Westside Freeway, the Foothill Freeway, and I-5 Truck. The route is defined by its efficiency, featuring a significant 225.6-mile uninterrupted stretch along the Westside Freeway. Because this is a high-speed transit route, you won't encounter technical local roads or winding back-country passes. Instead, you are looking at a consistent interstate grind that requires steady focus rather than complex navigation. The personality of this drive is utilitarian, prioritizing speed and connectivity as you transition between the southern and northern portions of the state.
99% highway — fuel and pacing are the main things to plan.
26 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 225.6 mi on Westside Freeway.
How Hard Is This Drive?
9/10
This is a straightforward highway drive that stays mostly on Westside Freeway and Foothill Freeway. This route has several spots where lane changes, forks, or exits need your full attention. The trickiest moment comes around 0.1 miles in.
Driving Effort9/10
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 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 0.1 miles: Lane positioning matters here; at 25.9 miles (I 210 / Foothill Freeway): Highway fork - watch signs carefully. Lane positioning matters here; at 111 miles (I 5 / Westside Freeway): Highway fork - watch signs carefully. 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.
On the drive from Diamond Bar, CA to Oakland, CA, road signs begin pointing toward San Francisco along the way.
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.
Doable as a same-day drive at 7h 21m. Total distance: 396.9 miles.
Family Friendly
Moderate complexity with 2 natural rest stops along the way.
Solo Traveler
7h 21m drive, plan rest stops for pacing.
Frequently Asked Questions
The longest stretch is about 225.6 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 Oakland, 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 2 meaningful breaks. Dedicated rest areas are limited, so plan gas or food stops as your bathroom breaks.
The main spots that need attention: at 0.1 miles: Lane positioning matters here; at 25.9 miles (I 210 / Foothill Freeway): Highway fork - watch signs carefully. Lane positioning matters here; at 111 miles (I 5 / Westside Freeway): Highway fork - watch signs carefully. Lane positioning matters here.
Yes — San Francisco Maritime National Historical Park, Rosie the Riveter WWII Home Front National Historical Park and Golden Gate National Recreation Area (6 total within detour distance). See the National Parks section for detour distances and tips on detours.
Not recommended in a single day. At 7.4 hours each way, a round trip means 14.7 hours of driving — that is an unsafe level of fatigue for most drivers. Plan at least one night at Oakland, CA before the return drive.
