Brentwood, CA to Fontana, CA is 389.2 miles and takes about 7h 20m via Westside Freeway and Foothill Freeway, with a fuel budget near $53 and enough daylight to finish in a day. This trip covers a significant portion of California, moving from the Pacific Coast region inland. It's a highway-focused drive, so expect consistent speeds and a focus on covering ground efficiently. With only 2 recommended stops and a driving time under 8 hours, it's a very manageable one-day journey. Plan for a straightforward trip that gets you from point A to point B with minimal fuss.
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
194.6 miles from Brentwood, CA
A natural place for your longest stop of the day
, about 3h 39m into the drive
.
Main Roads
Road
Distance
Duration
Westside Freeway
224.4 mi
4h
Foothill Freeway
67 mi
1h 17m
I 5 Truck
58.4 mi
1h 6m
William Elton Brown Freeway
14 mi
15m
Byron Highway
8.1 mi
12m
Brentwood Boulevard
3.7 mi
5m
Mountain House Parkway
3.4 mi
6m
Sierra Avenue
3 mi
4m
Longest stretch:
Westside Freeway
— 224.4 mi, about 4h
Turn-by-Turn Driving Directions
Step-by-step road directions between Brentwood, CA and Fontana, CA.
1
Start on Brentwood Boulevard
66 ft·8 sec·Brentwood Boulevard
2
Turn left onto Oak Street
97 ft·9 sec·Oak Street
Use the left lane.
3
Turn left
305 ft·23 sec
4
Turn right onto Brentwood Boulevard
3.7 mi·5 min·Brentwood Boulevard
5
Continue on Byron Highway
1.4 mi·2 min·Byron Highway
Use the straight lane.
6
Turn right onto J4
6.7 mi·10 min·Byron Highway
7
Continue on J4
1.5 mi·2 min·Byron-Bethany Road
8
Continue on J4
1.8 mi·2 min·Byron Road
9
Turn right onto Mountain House Parkway
2.7 mi·4 min·Mountain House Parkway
Use the slight left lane.
10
Continue on International Parkway
1.0 mi·1 min·International Parkway
Use the straight lane.
11
Continue on Mountain House Parkway
0.8 mi·1 min·Mountain House Parkway
Use the straight lane.
12
Take the ramp
0.2 mi·30 sec
13
Merge onto I 580
8.1 mi·8 min·William Elton Brown Freeway
14
Keep slight left at fork onto I 580
5.9 mi·6 min·William Elton Brown Freeway
15
Merge onto I 5
224 mi·4 hr·Westside Freeway
Use the straight / slight right lanes.
16
Keep slight right at fork onto I 5 Truck
58 mi·1 hr 6 min·I 5 Truck
Use the straight / slight right lanes.
17
Keep slight left at fork onto I 5
2.0 mi·2 min·Golden State Freeway
Use the straight / slight right lanes.
18
Take the exit
0.3 mi·17 sec
Exit 161AToward I 210 East: PasadenaUse the slight right lane.
19
Continue on I 210
24 mi·28 min·Foothill Freeway
Use the straight / slight right lanes.
20
Keep slight right at fork onto I 210
19 mi·22 min·Foothill Freeway
Toward CA 134 West, I 210 East: San Bernardino, VenturaUse the slight right lane.
21
Keep slight right at fork onto I 210
2.9 mi·3 min·Foothill Freeway
Use the straight / slight right lanes.
22
Keep slight right at fork onto CA 210
1.4 mi·1 min·Foothill Freeway
Use the straight / slight right lanes.
23
Keep slight right at fork onto CA 210
1.2 mi·1 min·Foothill Freeway
Use the straight / slight right lanes.
24
Keep slight right at fork onto CA 210
1.8 mi·2 min·Foothill Freeway
Use the straight / slight right lanes.
25
Keep slight right at fork onto CA 210
16 mi·18 min·Foothill Freeway
Use the straight / slight right lanes.
26
Take the exit
0.3 mi·46 sec
Exit 67Toward Sierra AvenueUse the straight / slight right lanes.
27
Turn right onto Sierra Avenue
3.0 mi·4 min·Sierra Avenue
Use the left / right lanes.
28
Turn left onto Merrill Avenue
205 ft·4 sec·Merrill Avenue
Use the left lane.
29
Arrive at destination
Merrill Avenue
Trip Plan
Given the 7h 20m estimated duration, starting your drive from Brentwood early in the morning is advisable to make the most of daylight. With only 2 stops recommended, you can plan them strategically to break up the 389.2 miles. Keep an eye on your fuel, as the longest stretch is over 200 miles; ensure you refuel before hitting that segment if needed. The $53 fuel cost estimate is helpful for budgeting, and since this is a single-day trip, you have the flexibility to adjust your stop times based on your needs. A practical tip for this drive is to be aware of potential traffic around major metropolitan areas, especially if your travel time overlaps with peak commute hours.
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 194.6 miles from Brentwood, CA, or about 3h 39m into the drive.
The longest continuous stretch on this route runs about 224.4 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 86 miles or 1h 43m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 194.6 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 9m
Traffic, exits, and arrival timing usually matter more near Fontana, CA than in the middle of the route.
Before You Leave
+
Open the route before leaving Brentwood, 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 Brentwood, CA
This is one driving day of about 389.2 miles and 7h 20m.
Your first comfortable stop window is around 86 miles from Brentwood, 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 224.4 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 21
5 decision points cluster between mile 0 and 385.8 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
7
0 mi into trip|~0m in|Oak Street
Turn left onto Oak Street
Lane positioning matters here
Use the left lane.
6
15.2 mi into trip|~23m in|Mountain House Parkway
Turn right onto Mountain House Parkway
Lane positioning matters here
Use the slight left lane.
7
318.6 mi into trip|~5h 56m 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
343.3 mi into trip|~6h 25m 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
385.8 mi into trip|~7h 14m in
Take the exit toward Sierra Avenue
Exit ramp - move to the correct lane early. Lane positioning matters here
Use the straight / slight right lanes.
Exit 67
Toward Sierra Avenue
Fuel & Cost
Regular Gas
$89.45 one way
$178.91 round trip
$5.84/gal25.4 MPG avg136 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$6.02
$92.18
$184.36
premium
$6.18
$94.65
$189.30
diesel
$5.61
$85.93
$171.86
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$89
Meals
$25–$50
Total
$114–$139
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 136.2 kg one way.
Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $41 in charging
· 1 stop
· 66% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
116.8
1
$40.87
$18.68
Efficient EV
97.3
1
$34.06
$15.57
EV Truck/SUV
155.7
1
$54.49
$24.91
Gas CO2
136 kg
EV CO2
46 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.
Forecast as of Apr 20, 2026
Origin
Brentwood, CA
Late night
in Brentwood on Tuesday
Local time
2:13 AM
PDT
Current temp
--
Unavailable
Destination
Fontana, CA
Late night
in Fontana on Tuesday
Local time
2:13 AM
PDT
Current temp
69°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.
Road read
7h 20m 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.
Port Chicago Naval Magazine National Memorial
National Memorial
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...
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...
24 mi from route
~60 min detour
Free
near mile 322.1
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
~68 min detour
Free
near mile 255
Park data from the National Park Service API. Alerts update every 2 hours.
More Details
What kind of drive is this?
This route is predominantly a highway-focused drive, with 95% of the journey on major freeways. You'll spend most of your time on the Westside Freeway and Foothill Freeway, offering a consistent driving experience. The longest uninterrupted stretch is a significant 224.4 miles on the Westside Freeway, meaning you can settle in for a long period of steady travel. While the landscape will change as you move across California, the character of the drive remains largely that of a high-speed, efficient transit route designed for covering distance.
95% highway — fuel and pacing are the main things to plan.
29 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 224.4 mi on Westside Freeway.
How Hard Is This Drive?
8/10
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 early in the drive near Oak Street.
Driving Effort8/10
Demanding - plan breaks and stay ahead of the key maneuvers
Balances navigation complexity with total wheel time.
This is a demanding drive. With 21 significant decision points across 389.2 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: near the start (Oak Street): Lane positioning matters here; at 15.2 miles (Mountain House Parkway): Lane positioning matters here; at 318.6 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.
On the drive from Brentwood, CA to Fontana, CA, road signs begin pointing toward Ventura along the way.
Brentwood is an affluent, suburban city in eastern Contra Costa County, California with a popular downtown for visitors coming from the Sacramento Valley to the county. It serves as one of the eastern gateways to the East Bay, along with Livermore. Many in the city are commuters.
Top landmarks
•Stone House of John Marsh — historic stone house in Contra Costa County, California
Doable as a same-day drive at 7h 20m. Total distance: 389.2 miles.
Family Friendly
Moderate complexity with 2 natural rest stops along the way.
Solo Traveler
7h 20m drive, plan rest stops for pacing.
Frequently Asked Questions
The longest stretch is about 224.4 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 Fontana, 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: near the start (Oak Street): Lane positioning matters here; at 15.2 miles (Mountain House Parkway): Lane positioning matters here; at 318.6 miles: Exit ramp - move to the correct lane early. Lane positioning matters here.
Yes — Port Chicago Naval Magazine National Memorial, 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 7.3 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 Fontana, CA before the return drive.
