Napa to San Diego is 518.3 miles and takes about 9h 51m via Westside Freeway and I-5, with a fuel budget near $70 and an overnight stay recommended. This long-distance drive traverses California from the Pacific Coast region down to its southern end, also along the Pacific Coast. Expect a predominantly highway experience for the majority of your journey. Given the 9h 51m driving time, splitting this trip over two days is a sensible approach to avoid excessive fatigue and make the most of your travel.
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
259.2 miles from Napa, CA
A natural place for your longest stop of the day
, about 4h 51m 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
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
Longest stretch:
Westside Freeway
— 224.4 mi, about 4h
Turn-by-Turn Driving Directions
Step-by-step road directions between Napa, CA and San Diego, CA.
1
Start on 3rd Street
0.2 mi·34 sec·3rd Street
2
Turn right onto Soscol Avenue
1.3 mi·2 min·Soscol Avenue
Use the right lane.
3
Continue on CA 221
2.7 mi·4 min·Napa-Vallejo Highway
Use the left / straight lanes.
4
Keep slight right at fork onto CA 221
484 ft·8 sec·Napa-Vallejo Highway
5
Take the ramp
0.2 mi·22 sec
Toward CA 29 South, CA 12 East: Vallejo, Fairfield
6
Continue on CA 12; CA 29
1.3 mi·1 min·Napa–Vallejo Highway
7
Continue on CA 29
4.0 mi·4 min·Broadway Street
8
Continue on CA 29
1.8 mi·2 min·Sonoma Boulevard
Use the straight lane.
9
Continue on CA 29
1.1 mi·1 min·Sonoma Boulevard
Use the straight lane.
10
Turn left onto Redwood Street
0.3 mi·44 sec·Redwood Street
Use the left / uturn lanes.
11
Turn right onto US 40 Hist
1.1 mi·1 min·Broadway Street
12
Turn slight left onto US 40 Hist
0.7 mi·1 min·Alameda Street
13
Turn left onto Curtola Parkway
7.1 mi·9 min·Curtola Parkway
Use the straight lane.
14
Keep slight left at fork onto I 780
0.7 mi·46 sec·I 780
Exit 7BToward I 680 South: Martinez, San Jose
15
Continue on I 680
8.0 mi·9 min·Benicia-Martinez Bridge
Use the straight / slight right lanes.
16
Keep slight right at fork onto I 680
4.8 mi·5 min·Senator Daniel E Boatwright Highway
Use the straight / slight right lanes.
17
Continue on I 680
1.4 mi·1 min·Donald D Doyle Highway
18
Keep slight right at fork onto I 680
13 mi·15 min·Donald D Doyle Highway
Use the straight / slight right lanes.
19
Take the exit
0.3 mi·33 sec
Exit 30AToward I 580 East: Livermore, StocktonUse the straight / slight right lanes.
20
Keep slight left at fork
0.7 mi·1 min
Toward I 580 East: Livermore, StocktonUse the straight / slight right lanes.
21
Keep slight left at fork
0.3 mi·38 sec
Toward I 580: StocktonUse the straight / slight right lanes.
22
Merge onto I 580
1.4 mi·1 min·Arthur H. Breed Junior Freeway
23
Keep slight right at fork onto I 580
18 mi·20 min·Arthur H. Breed Junior Freeway
Use the straight / slight right lanes.
24
Keep slight right at fork onto I 580
11 mi·11 min·William Elton Brown Freeway
25
Keep slight left at fork onto I 580
5.9 mi·6 min·William Elton Brown Freeway
26
Merge onto I 5
224 mi·4 hr·Westside Freeway
Use the straight / slight right lanes.
27
Keep slight right at fork onto I 5 Truck
58 mi·1 hr 6 min·I 5 Truck
Use the straight / slight right lanes.
28
Keep slight left at fork onto I 5
4.1 mi·4 min·Golden State Freeway
Use the straight / slight right lanes.
29
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.
30
Keep slight left at fork onto I 5 Truck
25 mi·29 min·I 5 Truck
Use the straight / slight right lanes.
31
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.
32
Merge onto I 5
26 mi·30 min·Santa Ana Freeway
Use the straight / slight right lanes.
33
Keep slight right at fork onto I 5
0.2 mi·16 sec·Santa Ana Freeway
Use the straight / slight right lanes.
34
Take the exit
0.8 mi·57 sec
Toward Broadway, Main Street, Santa AnaUse the straight / slight right lanes.
35
Keep slight left at fork
0.1 mi·10 sec
Use the straight / slight right lanes.
36
Keep slight left at fork
0.2 mi·12 sec
Toward I 5 South
37
Merge onto I 5
0.8 mi·54 sec·Santa Ana Freeway
38
Keep slight right at fork onto I 5
0.8 mi·52 sec·Santa Ana Freeway
39
Keep slight right at fork onto I 5
1.2 mi·1 min·Santa Ana Freeway
Use the straight / slight right lanes.
40
Take the exit
0.7 mi·1 min
Exit 102Toward Newport AvenueUse the slight right lane.
41
Turn right onto Newport Avenue
0.4 mi·44 sec·Newport Avenue
Use the right lane.
42
Turn left onto Walnut Avenue
2.2 mi·4 min·Walnut Avenue
43
Turn left onto Jamboree Road
0.5 mi·37 sec·Jamboree Road
Toward CA 261 Toll North: Jamboree Road, RiversideUse the left lane.
44
Take the exit
0.3 mi·21 sec
Toward I 5 South
45
Merge onto I 5
5.5 mi·6 min·Santa Ana Freeway
Use the straight / slight right lanes.
46
Keep slight left at fork onto I 5
0.8 mi·55 sec·Santa Ana Freeway
Use the straight / slight right lanes.
47
Merge onto I 5
76 mi·1 hr 29 min·San Diego Freeway
Use the straight / slight right lanes.
48
Take the exit
0.2 mi·28 sec
Exit 17Toward Front Street, Civic Center, 2nd AvenueUse the straight / slight right lanes.
49
Keep slight right at fork
0.1 mi·14 sec
Toward Front Street, Civic Center
50
Continue on Front Street
0.5 mi·1 min·Front Street
Use the straight / left lanes.
51
Arrive at destination
Front Street
Trip Plan
With a total duration of nearly 10 hours, this drive is best tackled over two days. Aim to depart Napa early in the morning on your first day to maximize daylight. Plan for at least two stops to break up the 518.3 miles and refuel. Given the longest stretch is over 224 miles, ensure you have ample fuel before embarking on that segment. Consider spending your overnight in a city roughly halfway, allowing for a more relaxed second day of driving towards San Diego.
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 259.2 miles from Napa, CA, or about 4h 51m 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 114 miles or 2h 15m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 259.2 miles or 4h 51m 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 259.2 miles or 4h 51m
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 8h 40m
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 Napa, 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 Napa, CA
Aim for roughly 259 miles and 4.9 hours of wheel time on this day.
Day 2
Finish the approach into San Diego, CA
Aim for roughly 259 miles and 4.9 hours of wheel time on this day.
Your first comfortable stop window is around 114 miles from Napa, 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 40
5 decision points cluster between mile 50.2 and 433.9 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
8
50.2 mi into trip|~1h 4m 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
50.5 mi into trip|~1h 4m 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
374.5 mi into trip|~6h 59m 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
399.5 mi into trip|~7h 28m 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
433.9 mi into trip|~8h 11m 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
$119.13 one way
$238.25 round trip
$5.84/gal25.4 MPG avg181 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$6.02
$122.76
$245.52
premium
$6.18
$126.04
$252.09
diesel
$5.61
$114.43
$228.87
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$119
Hotel (1n)
$80–$140
Meals
$50–$100
Total
$249–$359
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 181.3 kg one way.
Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $54 in charging
· 1 stop
· 66% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
155.5
1
$54.42
$24.88
Efficient EV
129.6
1
$45.35
$20.73
EV Truck/SUV
207.3
2
$72.56
$33.17
Gas CO2
181 kg
EV CO2
61 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 18, 2026
Origin
Napa, CA
Late night
in Napa on Tuesday
Local time
1:08 AM
PDT
Current temp
48°F
Unavailable
Live forecast
Destination
San Diego, CA
Late night
in San Diego on Tuesday
Local time
1:08 AM
PDT
Current temp
56°F
Partly Cloudy
0 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.
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
8 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
9h 51m 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 518.3
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...
9 mi from route
~23 min detour
Free
near mile 17.9
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...
15 mi from route
~37 min detour
Free
near mile 17.9
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...
21 mi from route
~52 min detour
Free
near mile 35.7
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...
22 mi from route
~55 min detour
Free
near mile 375.3
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,...
25 mi from route
~61 min detour
$15
near mile 17.9
Park data from the National Park Service API. Alerts update every 2 hours.
More Details
What kind of drive is this?
This route is characterized by its substantial highway share, at 90%, making it a long-distance freeway cruise. You'll encounter the Westside Freeway as a primary artery, which includes the longest uninterrupted stretch of 224.4 miles. The drive largely follows the I-5 Truck and San Diego Freeway, indicating a consistent, high-speed travel experience for most of the 518.3 miles. While the majority is interstate, the transition between these major highways defines the road's personality.
90% highway — fuel and pacing are the main things to plan.
51 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 50.2 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 518.3 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 50.2 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one; at 50.5 miles: Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one; at 374.5 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 Napa, CA and San Diego, CA, road signs point toward 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 259 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 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 50.2 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one; at 50.5 miles: Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one; at 374.5 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 9.9 hours each way, a round trip means 19.7 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.
