San Diego, CA to Westmont, CA is 120 miles and takes about 2h 24m via the San Diego Freeway and I 405, with a fuel budget near $28 and enough daylight to finish in a day. This drive stays within California's Pacific Coast region, offering a straightforward path north. It's primarily a highway-focused trip, making it a convenient option if you're looking for a direct connection between these two Southern California locations. With a recommended single day for travel and a manageable duration, this route is well-suited for a quick transit.
Trip Pace
Same-day drive is realistic
A same-day return is realistic if you keep stops short.
Midpoint
60 miles from San Diego, CA
A natural place for your longest stop of the day
, about 1h 11m into the drive
.
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
Doable as a same-day drive at 2h 24m. Total distance: 120 miles.
Family Friendly
Moderate complexity with 0 natural rest stops along the way.
Solo Traveler
2h 24m drive, comfortable solo distance.
First-Time Driver
Mostly highway driving (85%). Some complex stretches to watch for.
Drive Character
This is a highway-focused drive, with 85% of the journey on major freeways. You'll spend the majority of your time on the San Diego Freeway and I 405, experiencing a consistent pace. The longest uninterrupted stretch you'll encounter is 77.4 miles on the San Diego Freeway, so be prepared for extended periods of highway driving. While the San Joaquin Hills Transportation Corridor offers a slight variation, the overall character of this route is one of efficient, high-speed travel through Southern California.
Most of the miles stay on highways, which makes pacing and fuel planning easier than turn-by-turn city driving.
There are about 22 navigation steps in the underlying route data, so the final approach matters more than the middle miles.
San Diego Freeway is the longest continuous segment at about 77.4 miles.
How Hard Is This Drive?
This is a straightforward highway drive that stays mostly on San Diego Freeway and I 405. This route has several spots where lane changes, forks, or exits need your full attention. The trickiest moment comes around 0.1 miles in near 1st Avenue.
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 19 significant decision points across 120 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 (1st Avenue): Lane positioning matters here; at 0.6 miles: Lane positioning matters here; at 68.6 miles (CA 73 / San Joaquin Hills Transportation Corridor): Highway fork - watch signs carefully. Lane positioning matters here.
Critical Maneuvers
5 of 19 key points
These are the spots where you need to pay the most attention. Preview them before you drive.
6
0.1 mi into trip|~0m in|1st Avenue
Turn left onto 1st Avenue
Lane positioning matters here
Use the left lane.
6
0.6 mi into trip|~1m in
Take the ramp toward I 5 North: Los Angeles
Lane positioning matters here
Use the left / straight lanes.
Toward I 5 North: Los Angeles
7
68.6 mi into trip|~1h 21m in|CA 73 / San Joaquin Hills Transportation Corridor
Keep slight right at fork onto CA 73 / San Joaquin Hills Transportation Corridor toward CA 73 North: Long Beach
Highway fork - watch signs carefully. Lane positioning matters here
Use the straight / slight right lanes.
Toward CA 73 North: Long Beach
7
112.8 mi into trip|~2h 12m in
Take the exit toward I 110: Harbor Freeway, San Pedro, Los Angeles
Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one
Use the slight right lane.
Toward I 110: Harbor Freeway, San Pedro, Los An...
7
116.9 mi into trip|~2h 17m in
Take the exit toward El Segundo Boulevard
Exit ramp - move to the correct lane early. Lane positioning matters here
Use the slight right lane.
Exit 13
Toward El Segundo Boulevard
Towns Mentioned on Route Signs
Based on OSRM destination-sign hints, not a full list of every settlement the road passes.
Between San Diego, CA and Westmont, CA, road signs point toward San Pedro and Los Angeles.
San Pedro
112.8 mi in|~2h 12m
Los Angeles
112.8 mi in|~2h 12m
Main Roads
Road
Distance
Duration
San Diego Freeway
77.4 mi
1h 30m
I 405
16.4 mi
18m
San Joaquin Hills Transportation Corridor
14.1 mi
16m
Corona Del Mar Freeway
4 mi
4m
Harbor Freeway
3.7 mi
4m
South Normandie Avenue
1.7 mi
3m
West El Segundo Boulevard
0.9 mi
1m
1st Avenue
0.6 mi
1m
Longest stretch:
San Diego Freeway
— 77.4 mi, about 1h 30m
Turn-by-Turn Driving Directions
Step-by-step road directions between San Diego, CA and Westmont, CA.
1
Start on Front Street
26 ft·6 sec·Front Street
2
Turn left onto West Broadway
290 ft·12 sec·West Broadway
3
Turn left onto 1st Avenue
0.6 mi·1 min·1st Avenue
Use the left lane.
4
Take the ramp
0.2 mi·24 sec
Toward I 5 North: Los AngelesUse the left / straight lanes.
Toward CA 73 North: Long BeachUse the straight / slight right lanes.
9
Continue on CA 73
4.0 mi·4 min·Corona Del Mar Freeway
Use the straight / slight right lanes.
10
Merge onto I 405
9.6 mi·11 min·San Diego Freeway
Use the straight / slight right lanes.
11
Keep slight left at fork onto I 405
16 mi·18 min·I 405
Use the straight / slight right lanes.
12
Take the exit
380 ft·9 sec
Toward I 110: Harbor Freeway, San Pedro, Los AngelesUse the slight right lane.
13
Continue on this road
489 ft·11 sec·this road
Exit 37AToward I 110 South, I 110 North: Harbor Freeway, San Pedro, Los Angeles
14
Turn straight
0.3 mi·37 sec
Toward I 110 North: Los Angeles
15
Merge onto I 110
2.3 mi·2 min·Harbor Freeway
Use the straight / slight right lanes.
16
Keep slight right at fork onto I 110
1.3 mi·1 min·Harbor Freeway
17
Take the exit
0.3 mi·46 sec
Exit 13Toward El Segundo BoulevardUse the slight right lane.
18
Turn left onto West El Segundo Boulevard
0.9 mi·1 min·West El Segundo Boulevard
Use the left / right lanes.
19
Turn right onto South Normandie Avenue
1.7 mi·3 min·South Normandie Avenue
20
Turn left onto West 105th Street
0.1 mi·32 sec·West 105th Street
21
Turn right
169 ft·12 sec
22
Arrive at destination
Trip Plan
Given the relatively short duration of 2 hours and 24 minutes, this trip is easily doable in a single day. Aim to depart in the morning to avoid the heaviest traffic, particularly as you approach the Los Angeles metropolitan area. The $28 fuel cost is an estimate, so factor that into your budget. With no designated stops, you have the flexibility to pull over for breaks as needed, but be aware that the longest stretch on the San Diego Freeway is over 77 miles, so plan accordingly for rest or fuel if necessary.
Morning Departure
Leave by 9 AM and you'll arrive before lunch.
Evening Departure
Even a 4 PM departure gets you there before dark in summer.
You can normally do this drive in one day.
You may only need one short stretch break if traffic stays light.
The halfway point lands around 60 miles from San Diego, CA, or about 1h 11m into the drive.
The longest continuous stretch on this route runs about 77.4 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 26 miles or 31m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 60 miles or 1h 11m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Final approach
Final hour starts around 1h 55m
Traffic, exits, and arrival timing usually matter more near Westmont, CA than in the middle of the route.
Before You Leave
+
Open the route before leaving San Diego, 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.
Day 1
Settle into the route from San Diego, CA
This is one driving day of about 120 miles and 2h 24m.
Your first comfortable stop window is around 26 miles from San Diego, CA.
This route can stay practical as a one-day drive if traffic stays reasonable.
The longest stretch is on San Diego Freeway for about 77.4 miles.
Where to Stop
Rest stops, refuel points, and overnight suggestions along this route.
Halfway Point
Midpoint
About 60 mi from San Diego, CA
· 1h 11m into the drive
Place data sourced from public business listings. Hours and availability may vary.
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
Park Closure: Park Auditorium Closed Until Further Notice
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...
29 mi from route
~72 min detour
Free
near mile 120
Park data from the National Park Service API. Alerts update every 2 hours.
Fuel & Cost
Regular Gas
$27.58 one way
$55.16 round trip
$5.84/gal25.4 MPG avg42 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$6.02
$28.42
$56.84
premium
$6.18
$29.18
$58.37
diesel
$5.61
$26.49
$52.99
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$28
Meals
$25–$50
Total
$53–$78
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 42 kg one way.
Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $13 in charging
· 0 stops
· 67% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
36
0
$12.60
$5.76
Efficient EV
30
0
$10.50
$4.80
EV Truck/SUV
48
0
$16.80
$7.68
Gas CO2
42 kg
EV CO2
14 kg (67% less)
This trip is well within single-charge range for most EVs. No charging stops needed if you start fully charged.
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
San Diego, CA
Morning
in San Diego on Saturday
Local time
9:02 AM
PDT
Current temp
56°F
Partly Cloudy
SW 0 to 5 mph0% chanceLive forecast
Destination
Westmont, CA
Morning
in Westmont on Saturday
Local time
9:02 AM
PDT
Current temp
72°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.
Temperature spread
16 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
2h 24m on the road
The weather snapshot is not static. If you are leaving later, give both cities one more quick forecast check before departure.
Weather data from the National Weather Service. Conditions may change; check closer to your travel date.
Frequently Asked Questions
The drive from San Diego, CA to Westmont, CA covers 120 miles and takes about 2h 24m without stops. Add 15-30 minutes for a fuel or rest stop on longer drives.
The main roads are San Diego Freeway, I 405, San Joaquin Hills Transportation Corridor. Most of the drive stays on highways, so watch for ramps and exits.
This is a comfortable same-day trip.
The midpoint is about 60 miles from San Diego, CA. Look for rest areas, gas stations, or food options near the halfway mark.
At current regular gas prices, expect to spend about $27.58 one way. This estimate uses 25.4 MPG — your actual cost will vary with your vehicle's fuel efficiency and current gas prices.
Leave by 9 AM and you'll arrive before lunch. Even a 4 PM departure gets you there before dark in summer.
This is a demanding drive. With 19 significant decision points across 120 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.
The main spots that need attention: at 0.1 miles (1st Avenue): Lane positioning matters here; at 0.6 miles: Lane positioning matters here; at 68.6 miles (CA 73 / San Joaquin Hills Transportation Corridor): Highway fork - watch signs carefully. Lane positioning matters here.
Between San Diego, CA and Westmont, CA, road signs point toward San Pedro and Los Angeles.
Yes. Nearby national parks include Cabrillo National Monument and Santa Monica Mountains National Recreation Area.
How this page is built
Compiled by the Trip.ovh planning team at COD Solutions Oy from open government datasets — OSRM over OpenStreetMap for geometry, EIA for fuel prices, and NPS for national parks. See our methodology for refresh cadence and limitations.
