Sonoma, CA to Fontana, CA is 451.7 miles and takes about 8h 31m via Westside Freeway and I 5 Truck, with a fuel budget near $104 and enough daylight to finish in a day. This drive is entirely within California, taking you from the Pacific Coast region to another part of the same region. It's a highway-focused journey, meaning you'll be covering a lot of ground efficiently. Consider this route if you're looking for a straightforward way to get from Northern California to Southern California without much fuss. The recommended two days of travel allow for a more relaxed pace, but it can be done in one if you start early.
Trip Pace
Best split across 2 days
Treat the return leg as its own travel day rather than an afterthought.
Break Rhythm
2 planned breaks
Plan on a short reset every 3 to 4 hours to stay fresh behind the wheel.
Midpoint
225.9 miles from Sonoma, CA
A natural place for your longest stop of the day
, about 4h 17m 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
Arthur H. Breed Junior Freeway
19.2 mi
22m
William Elton Brown Freeway
17 mi
18m
Donald D Doyle Highway
14.8 mi
17m
Benicia-Martinez Bridge
8 mi
9m
Curtola Parkway
7.1 mi
9m
Longest stretch:
Westside Freeway
— 224.4 mi, about 4h
Traffic on I-5
Hour-of-day weekday pattern from 81 FHWA count stations on your route.
Peak
2 PM
~1,500 veh/hr typical
· worst 2,272
Quietest
2 AM
~312 veh/hr
Peak-to-quiet ratio
4.8×
busier at peak than in the quiet hours
12a6anoon6p11p
Averaged across 44 weeks of 2023 FHWA Travel Monitoring Analysis System data. Weekday hours only (Mon–Fri).
Turn-by-Turn Driving Directions
Step-by-step road directions between Sonoma, CA and Fontana, CA.
1
Start on CA 12
46 ft·5 sec·West Napa Street
2
Turn right onto CA 12
1.1 mi·1 min·Broadway
Use the right lane.
3
Turn left onto Napa Road
4.3 mi·6 min·Napa Road
Use the left lane.
4
At end of road, turn left onto CA 12; CA 121
0.8 mi·1 min·Fremont Drive
5
Continue on CA 12; CA 121
4.4 mi·6 min·Carneros Highway
6
Turn right onto CA 29
2.7 mi·3 min·Saint Helena Highway
Use the straight / slight right lanes.
7
Continue on CA 12; CA 29
1.3 mi·1 min·Napa–Vallejo Highway
8
Continue on CA 29
4.0 mi·4 min·Broadway Street
9
Continue on CA 29
1.8 mi·2 min·Sonoma Boulevard
Use the straight lane.
10
Continue on CA 29
1.1 mi·1 min·Sonoma Boulevard
Use the straight lane.
11
Turn left onto Redwood Street
0.3 mi·44 sec·Redwood Street
Use the left / uturn lanes.
12
Turn right onto US 40 Hist
1.1 mi·1 min·Broadway Street
13
Turn slight left onto US 40 Hist
0.7 mi·1 min·Alameda Street
14
Turn left onto Curtola Parkway
7.1 mi·9 min·Curtola Parkway
Use the straight lane.
15
Keep slight left at fork onto I 780
0.7 mi·46 sec·I 780
Exit 7BToward I 680 South: Martinez, San Jose
16
Continue on I 680
8.0 mi·9 min·Benicia-Martinez Bridge
Use the straight / slight right lanes.
17
Keep slight right at fork onto I 680
4.8 mi·5 min·Senator Daniel E Boatwright Highway
Use the straight / slight right lanes.
18
Continue on I 680
1.4 mi·1 min·Donald D Doyle Highway
19
Keep slight right at fork onto I 680
13 mi·15 min·Donald D Doyle Highway
Use the straight / slight right lanes.
20
Take the exit
0.3 mi·33 sec
Exit 30AToward I 580 East: Livermore, StocktonUse the straight / slight right lanes.
21
Keep slight left at fork
0.7 mi·1 min
Toward I 580 East: Livermore, StocktonUse the straight / slight right lanes.
22
Keep slight left at fork
0.3 mi·38 sec
Toward I 580: StocktonUse the straight / slight right lanes.
23
Merge onto I 580
1.4 mi·1 min·Arthur H. Breed Junior Freeway
24
Keep slight right at fork onto I 580
18 mi·20 min·Arthur H. Breed Junior Freeway
Use the straight / slight right lanes.
25
Keep slight right at fork onto I 580
11 mi·11 min·William Elton Brown Freeway
26
Keep slight left at fork onto I 580
5.9 mi·6 min·William Elton Brown Freeway
27
Merge onto I 5
224 mi·4 hr·Westside Freeway
Use the straight / slight right lanes.
28
Keep slight right at fork onto I 5 Truck
58 mi·1 hr 6 min·I 5 Truck
Use the straight / slight right lanes.
29
Keep slight left at fork onto I 5
2.0 mi·2 min·Golden State Freeway
Use the straight / slight right lanes.
30
Take the exit
0.3 mi·17 sec
Exit 161AToward I 210 East: PasadenaUse the slight right lane.
31
Continue on I 210
24 mi·28 min·Foothill Freeway
Use the straight / slight right lanes.
32
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.
33
Keep slight right at fork onto I 210
2.9 mi·3 min·Foothill Freeway
Use the straight / slight right lanes.
34
Keep slight right at fork onto CA 210
1.4 mi·1 min·Foothill Freeway
Use the straight / slight right lanes.
35
Keep slight right at fork onto CA 210
1.2 mi·1 min·Foothill Freeway
Use the straight / slight right lanes.
36
Keep slight right at fork onto CA 210
1.8 mi·2 min·Foothill Freeway
Use the straight / slight right lanes.
37
Keep slight right at fork onto CA 210
16 mi·18 min·Foothill Freeway
Use the straight / slight right lanes.
38
Take the exit
0.3 mi·46 sec
Exit 67Toward Sierra AvenueUse the straight / slight right lanes.
39
Turn right onto Sierra Avenue
3.0 mi·4 min·Sierra Avenue
Use the left / right lanes.
40
Turn left onto Merrill Avenue
205 ft·4 sec·Merrill Avenue
Use the left lane.
41
Arrive at destination
Merrill Avenue
Trip Plan
Given the 8h 31m duration, starting your drive early in the morning is highly recommended to make the most of daylight. With two recommended days of travel, you can split the 451.7 miles into two manageable segments, perhaps stopping around the halfway point. However, if you're aiming for a single day, be prepared for a solid 8.5-hour driving commitment. Keep an eye on fuel stops, especially for the longest stretch of 224.4 miles on the Westside Freeway, ensuring you fill up before you're running low.
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 drive is better paced as a 2-day trip.
Plan roughly 2 meaningful breaks for fuel, food, and rest.
The halfway point lands around 225.9 miles from Sonoma, CA, or about 4h 17m into the drive.
The longest continuous stretch on this route runs about 224.4 miles.
Consider an overnight stop or starting very early.
Departure
Before you leave
Start with fuel, water, and navigation already sorted so the first hour feels easy.
First stop
Around 99 miles or 2h 1m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 225.9 miles or 4h 17m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Overnight split
Day 1 wrap after about 225.9 miles or 4h 17m
Stop before fatigue turns the last few hours into a grind. You want day two to start fresh, not just resumed.
Final approach
Final hour starts around 7h 20m
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 Sonoma, 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.
+
Treat this as a 2-day road trip and book the overnight stop before the busiest arrival window.
Day 1
Settle into the route from Sonoma, CA
Aim for roughly 226 miles and 4.3 hours of wheel time on this day.
Day 2
Finish the approach into Fontana, CA
Aim for roughly 226 miles and 4.3 hours of wheel time on this day.
Your first comfortable stop window is around 99 miles from Sonoma, CA.
This route usually feels better as a 2-day drive than as one long push.
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 30
5 decision points cluster between mile 30.7 and 405.9 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
7
30.7 mi into trip|~42m in|I 780
Keep slight left at fork onto I 780 toward I 680 South: Martinez, San Jose
Highway fork - watch signs carefully. Multiple destination signs - pick the right one
Exit 7B
Toward I 680 South: Martinez, San Jose
8
59 mi into trip|~1h 15m in
Take the exit toward I 580 East: Livermore, Stockton
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 30A
Toward I 580 East: Livermore, Stockton
8
59.2 mi into trip|~1h 15m in
Keep slight left at fork toward I 580 East: Livermore, Stockton
Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one
Use the straight / slight right lanes.
Toward I 580 East: Livermore, Stockton
7
59.9 mi into trip|~1h 17m in
Keep slight left at fork toward I 580: Stockton
Highway fork - watch signs carefully. Lane positioning matters here
Use the straight / slight right lanes.
Toward I 580: Stockton
8
405.9 mi into trip|~7h 36m 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,...
Fuel & Cost
Regular Gas
$94.50 one way
$189.00 round trip
$5.31/gal25.4 MPG avg158 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$5.52
$98.15
$196.29
premium
$5.67
$100.74
$201.49
diesel
$4.80
$85.29
$170.58
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$95
Hotel (1n)
$80–$140
Meals
$50–$100
Total
$225–$335
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 158 kg one way.
Prices: EIA weekly data, 2026-07-13.
Driving Electric?
About $47 in charging
· 1 stop
· 66% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
135.5
1
$47.43
$21.68
Efficient EV
112.9
1
$39.52
$18.07
EV Truck/SUV
180.7
2
$63.24
$28.91
Gas CO2
158 kg
EV CO2
53 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 Jul 17, 2026
Origin
Sonoma, CA
Late night
in Sonoma on Sunday
Local time
12:04 AM
PDT
Current temp
87°F
Sunny
WSW 9 mph0% chanceLive forecast
Extreme Heat Warning
Extreme Heat Warning issued July 16 at 1:29PM PDT until July 16 at 8:00PM PDT by NWS San Diego CA
Extreme Heat Warning
Extreme Heat Warning issued July 16 at 1:29PM PDT until July 16 at 8:00PM PDT by NWS San Diego CA
Destination
Fontana, CA
Late night
in Fontana on Sunday
Local time
12:04 AM
PDT
Current temp
99°F
Sunny
SW 15 mph3% chanceLive forecast
Extreme Heat Warning
Extreme Heat Warning issued July 16 at 1:29PM PDT until July 16 at 8:00PM PDT by NWS San Diego CA
Extreme Heat Warning
Extreme Heat Warning issued July 16 at 1:29PM PDT until July 16 at 8:00PM PDT by NWS San Diego 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.
For long drives, weather on day two can matter just as much as conditions at departure, so check the whole travel window rather than only the first day.
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
12 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
8h 31m on the road
This is long enough that the arrival forecast matters almost as much as departure conditions. Recheck both ends before you roll.
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...
5 mi from route
~14 min detour
Free
near mile 31.2
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...
16 mi from route
~39 min detour
Free
near mile 31.2
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...
22 mi from route
~54 min detour
Free
near mile 46.7
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
~59 min detour
Free
near mile 373.9
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,...
27 mi from route
~67 min detour
$15
near mile 31.2
From its thunderous ocean breakers crashing against rocky headlands and expansive sand beaches to its open grasslands, brushy hillsides, and forested ridges, Point Reyes offers visitors over 1500 spec...
Park data from the National Park Service API. Alerts update every 2 hours.
More Details
What kind of drive is this?
This is an 88% highway-focused drive, so expect long stretches of consistent speed. The longest uninterrupted stretch you'll encounter is 224.4 miles on the Westside Freeway. While much of the route utilizes major freeways like the Westside Freeway and I 5 Truck, it's designed for efficiency rather than scenic detours. The character of the drive is primarily about covering distance, with the landscape changing gradually as you move south through California. Prepare for a steady cruise for the majority of your trip.
88% highway — fuel and pacing are the main things to plan.
41 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?
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 30.7 miles in near I 780.
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 30 significant decision points across 451.7 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 30.7 miles (I 780): Highway fork - watch signs carefully. Multiple destination signs - pick the right one; at 59 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one; at 59.2 miles: Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one.
Elevation Profile
Hilly terrain with moderate elevation changes
2,810 ft1 ft
Total Climb
4,010 ft
Total Descent
2,859 ft
Highest Point
2,810 ft
~354.9 mi in
Elevation Range
2,809 ft
Notable High Points
2,810 ft at ~354.9 miles+1,613 ft prominence
Towns Mentioned on Route Signs
Based on OSRM destination-sign hints, not a full list of every settlement the road passes.
Between Sonoma, CA and Fontana, CA, road signs point toward San Jose, Stockton and Ventura.
Sonoma is a city in the Sonoma Valley within Sonoma County, in the north part of the Bay Area of California. With its central location in wine country, the city of Sonoma, with little over 10,000 residents, attracts thousands of visitors from around the world for wine tastings.
Top landmarks
•Sonoma Plaza — plaza in Sonoma, California
•Vallejo Home — historic house in Sonoma, California, USA
The longest stretch is about 224.4 miles on Westside Freeway. The full list of main roads is in the Roads section above.
Yes — a 2-day pace is more comfortable than one long haul. A sensible stopping point is after roughly 226 miles on day one.
Yes — we found about 36 rest areas or service plazas within a short detour of the route (from OpenStreetMap). See the Rest Stops tab under Nearby Places for locations and mile markers. Plan to stretch, use the bathroom, and top off fluids every 2–3 hours on longer drives.
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. There are 36 rest areas along the route for bathroom stops.
The main spots that need attention: at 30.7 miles (I 780): Highway fork - watch signs carefully. Multiple destination signs - pick the right one; at 59 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one; at 59.2 miles: Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one.
Yes — Port Chicago Naval Magazine National Memorial, Rosie the Riveter WWII Home Front National Historical Park and San Francisco Maritime National Historical Park (6 total within detour distance). See the National Parks section for detour distances and tips on detours.
Not recommended in a single day. At 8.5 hours each way, a round trip means 17.0 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.
