Cobb, CA to San Diego, CA is 570.7 miles and takes about 10h 59m via Westside Freeway and I 5 Truck, with a fuel budget near $131 and recommended for 2 days. This long-distance drive will take you from the Pacific Coast region of Northern California down to the Pacific Coast region of Southern California. Given the nearly 11-hour drive time, splitting this journey over two days is highly recommended to make it more manageable and enjoyable. You'll spend a significant portion of your time on major freeways, so prepare for a consistent travel pace.
Trip Pace
Best split across 2 days
Treat the return leg as its own travel day rather than an afterthought.
Break Rhythm
3 planned breaks
Plan on a short reset every 3 to 4 hours to stay fresh behind the wheel.
Midpoint
285.4 miles from Cobb, CA
A natural place for your longest stop of the day
, about 5h 30m into the drive
.
Main Roads
Road
Distance
Duration
Westside Freeway
224.4 mi
4h
I 5 Truck
83.3 mi
1h 36m
San Diego Freeway
76.5 mi
1h 29m
Santa Ana Freeway
35 mi
40m
Saint Helena Highway South
21.7 mi
25m
Arthur H. Breed Junior Freeway
19.2 mi
22m
William Elton Brown Freeway
17 mi
18m
Calistoga Street
16.5 mi
24m
Longest stretch:
Westside Freeway
— 224.4 mi, about 4h
Turn-by-Turn Driving Directions
Step-by-step road directions between Cobb, CA and San Diego, CA.
1
Start on High Road
0.2 mi·39 sec·High Road
2
Turn right onto CA 175
8.3 mi·12 min·CA 175
3
Turn right onto CA 29
16 mi·24 min·Calistoga Street
4
Continue on CA 29
1.0 mi·1 min·Lincoln Avenue
5
Turn left onto CA 29; CA 128
6.8 mi·7 min·Saint Helena Highway
6
Continue on CA 29; CA 128
2.4 mi·2 min·Main Street
7
Continue on CA 29; CA 128
22 mi·25 min·Saint Helena Highway South
Use the straight / slight right lanes.
8
Continue on CA 12; CA 29
1.3 mi·1 min·Napa–Vallejo Highway
9
Continue on CA 29
4.0 mi·4 min·Broadway Street
10
Continue on CA 29
1.8 mi·2 min·Sonoma Boulevard
Use the straight lane.
11
Continue on CA 29
1.1 mi·1 min·Sonoma Boulevard
Use the straight lane.
12
Turn left onto Redwood Street
0.3 mi·44 sec·Redwood Street
Use the left / uturn lanes.
13
Turn right onto US 40 Hist
1.1 mi·1 min·Broadway Street
14
Turn slight left onto US 40 Hist
0.7 mi·1 min·Alameda Street
15
Turn left onto Curtola Parkway
7.1 mi·9 min·Curtola Parkway
Use the straight lane.
16
Keep slight left at fork onto I 780
0.7 mi·46 sec·I 780
Exit 7BToward I 680 South: Martinez, San Jose
17
Continue on I 680
8.0 mi·9 min·Benicia-Martinez Bridge
Use the straight / slight right lanes.
18
Keep slight right at fork onto I 680
4.8 mi·5 min·Senator Daniel E Boatwright Highway
Use the straight / slight right lanes.
19
Continue on I 680
1.4 mi·1 min·Donald D Doyle Highway
20
Keep slight right at fork onto I 680
13 mi·15 min·Donald D Doyle Highway
Use the straight / slight right lanes.
21
Take the exit
0.3 mi·33 sec
Exit 30AToward I 580 East: Livermore, StocktonUse the straight / slight right lanes.
22
Keep slight left at fork
0.7 mi·1 min
Toward I 580 East: Livermore, StocktonUse the straight / slight right lanes.
23
Keep slight left at fork
0.3 mi·38 sec
Toward I 580: StocktonUse the straight / slight right lanes.
24
Merge onto I 580
1.4 mi·1 min·Arthur H. Breed Junior Freeway
25
Keep slight right at fork onto I 580
18 mi·20 min·Arthur H. Breed Junior Freeway
Use the straight / slight right lanes.
26
Keep slight right at fork onto I 580
11 mi·11 min·William Elton Brown Freeway
27
Keep slight left at fork onto I 580
5.9 mi·6 min·William Elton Brown Freeway
28
Merge onto I 5
224 mi·4 hr·Westside Freeway
Use the straight / slight right lanes.
29
Keep slight right at fork onto I 5 Truck
58 mi·1 hr 6 min·I 5 Truck
Use the straight / slight right lanes.
30
Keep slight left at fork onto I 5
4.1 mi·4 min·Golden State Freeway
Use the straight / slight right lanes.
31
Keep slight right at fork onto I 5 Truck
0.3 mi·17 sec·I 5 Truck
Exit 158Toward I 405 SouthUse the straight / slight right lanes.
32
Keep slight left at fork onto I 5 Truck
25 mi·29 min·I 5 Truck
Use the straight / slight right lanes.
33
Keep slight left at fork onto I 5
1.3 mi·1 min·Golden State Freeway
Toward CA 60 East, I 5 South: Pomona, Soto Street, Santa AnaUse the slight left / straight lanes.
34
Merge onto I 5
26 mi·30 min·Santa Ana Freeway
Use the straight / slight right lanes.
35
Keep slight right at fork onto I 5
0.2 mi·16 sec·Santa Ana Freeway
Use the straight / slight right lanes.
36
Take the exit
0.8 mi·57 sec
Toward Broadway, Main Street, Santa AnaUse the straight / slight right lanes.
37
Keep slight left at fork
0.1 mi·10 sec
Use the straight / slight right lanes.
38
Keep slight left at fork
0.2 mi·12 sec
Toward I 5 South
39
Merge onto I 5
0.8 mi·54 sec·Santa Ana Freeway
40
Keep slight right at fork onto I 5
0.8 mi·52 sec·Santa Ana Freeway
41
Keep slight right at fork onto I 5
1.2 mi·1 min·Santa Ana Freeway
Use the straight / slight right lanes.
42
Take the exit
0.7 mi·1 min
Exit 102Toward Newport AvenueUse the slight right lane.
43
Turn right onto Newport Avenue
0.4 mi·44 sec·Newport Avenue
Use the right lane.
44
Turn left onto Walnut Avenue
2.2 mi·4 min·Walnut Avenue
45
Turn left onto Jamboree Road
0.5 mi·37 sec·Jamboree Road
Toward CA 261 Toll North: Jamboree Road, RiversideUse the left lane.
46
Take the exit
0.3 mi·21 sec
Toward I 5 South
47
Merge onto I 5
5.5 mi·6 min·Santa Ana Freeway
Use the straight / slight right lanes.
48
Keep slight left at fork onto I 5
0.8 mi·55 sec·Santa Ana Freeway
Use the straight / slight right lanes.
49
Merge onto I 5
76 mi·1 hr 29 min·San Diego Freeway
Use the straight / slight right lanes.
50
Take the exit
0.2 mi·28 sec
Exit 17Toward Front Street, Civic Center, 2nd AvenueUse the straight / slight right lanes.
51
Keep slight right at fork
0.1 mi·14 sec
Toward Front Street, Civic Center
52
Continue on Front Street
0.5 mi·1 min·Front Street
Use the straight / left lanes.
53
Arrive at destination
Front Street
Trip Plan
For this nearly 11-hour drive, planning for two days is the most sensible approach. Aim to start early on your first day to cover a substantial portion, perhaps around 224.4 miles, to break up the journey. With 3 recommended stops, you'll have opportunities to refuel and rest. Keep a close eye on your fuel levels, especially during the longer highway stretches, as services can be spread out. The estimated fuel cost of $131 provides a good budget guideline for this substantial trip.
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 3 meaningful breaks for fuel, food, and rest.
The halfway point lands around 285.4 miles from Cobb, CA, or about 5h 30m 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 126 miles or 2h 39m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 285.4 miles or 5h 30m 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 285.4 miles or 5h 30m
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 9h 47m
Traffic, exits, and arrival timing usually matter more near San Diego, CA than in the middle of the route.
Before You Leave
+
Open the route before leaving Cobb, 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 Cobb, CA
Aim for roughly 285 miles and 5.5 hours of wheel time on this day.
Day 2
Finish the approach into San Diego, CA
Aim for roughly 285 miles and 5.5 hours of wheel time on this day.
Your first comfortable stop window is around 126 miles from Cobb, CA.
This route usually feels better as a 2-day drive than as one long push.
Plan about 3 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 40
5 decision points cluster between mile 102.7 and 486.3 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
8
102.7 mi into trip|~2h 11m 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
102.9 mi into trip|~2h 12m 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
8
427 mi into trip|~8h 7m in|I 5 Truck
Keep slight right at fork onto I 5 Truck toward I 405 South
Highway fork - watch signs carefully. Lane positioning matters here
Use the straight / slight right lanes.
Exit 158
Toward I 405 South
8
451.9 mi into trip|~8h 36m in|I 5 / Golden State Freeway
Keep slight left at fork onto I 5 / Golden State Freeway toward CA 60 East, I 5 South: Pomona, Soto Street, Santa Ana
Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one
Use the slight left / straight lanes.
Toward CA 60 East, I 5 South: Pomona, Soto Stre...
8
486.3 mi into trip|~9h 19m in|Jamboree Road
Turn left onto Jamboree Road toward CA 261 Toll North: Jamboree Road, Riverside
Lane positioning matters here. Multiple destination signs - pick the right one
Use the left lane.
Toward CA 261 Toll North: Jamboree Road, Rivers...
Fuel & Cost
Regular Gas
$131.17 one way
$262.34 round trip
$5.84/gal25.4 MPG avg200 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$6.02
$135.17
$270.34
premium
$6.18
$138.79
$277.58
diesel
$5.61
$126.00
$252.01
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$131
Hotel (1n)
$80–$140
Meals
$50–$100
Total
$261–$371
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 199.7 kg one way.
Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $60 in charging
· 2 stops
· 67% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
171.2
2
$59.92
$27.39
Efficient EV
142.7
1
$49.94
$22.83
EV Truck/SUV
228.3
2
$79.90
$36.52
Gas CO2
200 kg
EV CO2
67 kg (67% less)
Plan for 2 charging stops, roughly every 270 miles. Allow 25-40 minutes per stop at a DC fast charger.
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
Cobb, CA
Late night
in Cobb on Tuesday
Local time
5:12 AM
PDT
Current temp
45°F
Unavailable
Live forecast
Destination
San Diego, CA
Late night
in San Diego on Tuesday
Local time
5:12 AM
PDT
Current temp
58°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.
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
13 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
10h 59m 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.
Cabrillo National Monument
National Monument
In 1542, Juan Rodriguez Cabrillo climbed out of his boat and onto shore, becoming the first European to set foot on what is now the West Coast of the United States. Cabrillo National Monument not only...
5 mi from route
~13 min detour
$20
near mile 570.7
Park Closure: Park Auditorium Closed Until Further Notice
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
~11 min detour
Free
near mile 78.7
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
~41 min detour
Free
near mile 78.7
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...
23 mi from route
~57 min detour
Free
near mile 78.7
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...
23 mi from route
~57 min detour
Free
near mile 433
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,...
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 drive, with 84% of the journey on major freeways like the Westside Freeway and I 5 Truck. Expect long stretches of consistent speed; the longest uninterrupted segment spans 224.4 miles on the Westside Freeway. While the majority of the drive is on high-speed roads, the transition from Northern California to Southern California will gradually shift the landscape. This isn't a winding, scenic backroad adventure, but rather a direct path designed for efficient travel.
84% highway — fuel and pacing are the main things to plan.
53 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?
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 102.7 miles in.
Driving Effort10/10
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 40 significant decision points across 570.7 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 102.7 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one; at 102.9 miles: Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one; at 427 miles (I 5 Truck): 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.
Between Cobb, CA and San Diego, CA, road signs point toward San Jose, Stockton, Santa Ana, Broadway and Riverside.
From balmy beaches with a laid-back attitude to a gleaming modern image, San Diego offers much for the tourist to enjoy. Situated on the Southern California seacoast, San Diego is the second largest city in the state, with 1.4 million residents (2020), and has long attracted travelers for its ideal climate, miles of beaches, and location on the Mexican border right across from Tijuana.
But there's much more here than surfer culture and a quick hop across the border. A rich maritime and military heritage lives on in San Diego, which is home to the Pacific Fleet of the United States Navy. The city has also become known for its part in the wildlife conservation movement, owing to the presence of the world-renowned San Diego Zoo and Safari Park and the Scripps Institution of Oceanography. Natural scenery abounds from rocky tidepools and seaside cliffs to desert hills and canyons inland.
Top landmarks
•Balboa Park — historic park in San Diego, California
•Cabrillo National Monument — National Monument of the United States and historic district
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 285 miles on day one.
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 San Diego, 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 3 meaningful breaks. Dedicated rest areas are limited, so plan gas or food stops as your bathroom breaks.
The main spots that need attention: at 102.7 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one; at 102.9 miles: Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one; at 427 miles (I 5 Truck): Highway fork - watch signs carefully. Lane positioning matters here.
Yes — Cabrillo National Monument, Port Chicago Naval Magazine National Memorial and Rosie the Riveter WWII Home Front 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 11.0 hours each way, a round trip means 22.0 hours of driving — that is an unsafe level of fatigue for most drivers. Plan at least one night at San Diego, CA before the return drive.
