How far is San Diego, CA from Los Alamos, CA?
The driving distance from San Diego, CA to Los Alamos, CA is about 263.2 miles (423.5 km), with a travel time of about 05h 17m by car.
- The straight-line flight distance is about 227.2 miles (365.7 km).
- For a round trip, plan for roughly 10h 34m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 6:00 AM to 8:00 AM PDT.
Reverse, save, or send this route
This drive is better planned with a longer stop or an overnight stay. Copy the route link, send it to another device, or print a clean version before you head out.
This drive is better planned with a longer stop or an overnight stay.
Flight Distance
Driving Distance
Gas Cost Calculator
Leave and Arrive Planner
Pick a departure time to see your estimated arrival and same-day return window.
Drive time stays fixed at 05h 17m.
An early departure helps you fit a real stop into the day without turning the return into a late-night drive.
You are leaving earlier than the recommended window, which gives you extra margin for breaks and traffic.
Halfway Point
A useful midpoint for breaks, coffee, or meeting in the middle.
City in Los Angeles County, California, United States
Route Weather Snapshot
Check the forecast at both ends before you head out.
Sunny
Driving Route Map
The map below follows the saved road route between San Diego and Los Alamos.
Turn-by-Turn Driving Directions
Step-by-step road directions between San Diego and Los Alamos.
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1
Start on Front Street
8 m · 6 sec · Front Street
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2
Turn left onto West Broadway
88 m · 12 sec · West Broadway
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3
Turn left onto 1st Avenue
3072 ft · 1 min · 1st Avenue
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4
Take the ramp left toward I 5 North: Los Angeles
1017 ft · 25 sec
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5
Merge slight left onto San Diego Freeway
13.5 mi · 16 min · San Diego Freeway
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6
Keep slight left to continue on San Diego Freeway
36.3 mi · 43 min · San Diego Freeway
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7
Keep slight right to continue on San Diego Freeway
18.1 mi · 21 min · San Diego Freeway
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8
Keep slight right to continue on San Joaquin Hills Transportation Corridor
14.1 mi · 16 min · San Joaquin Hills Transportation Corridor
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9
Continue on Corona Del Mar Freeway
4 mi · 5 min · Corona Del Mar Freeway
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10
Merge slight left onto San Diego Freeway
9.6 mi · 11 min · San Diego Freeway
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11
Keep slight left
42.5 mi · 49 min
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12
Take the exit slight right toward US 101 North, US 101 South: Ventura, Los Angeles
3062 ft · 1 min
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13
Keep slight left to continue on US 101 North: Ventura
3235 ft · 1 min
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14
Merge slight right onto Ventura Freeway
46.9 mi · 54 min · Ventura Freeway
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15
Keep slight left
18.5 mi · 21 min
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16
Continue on El Camino Real
16.4 mi · 19 min · El Camino Real
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17
Take the exit slight right toward CA 154: State Street, Cachuma Lake
1127 ft · 29 sec
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18
Continue on Calle Real
1672 ft · 40 sec · Calle Real
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19
Turn right onto Chumash Highway
23.9 mi · 33 min · Chumash Highway
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20
Enter the roundabout and take exit 2 toward Chumash Highway
35 m · 2 sec · Chumash Highway
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21
Exit the roundabout onto Chumash Highway
2.2 mi · 3 min · Chumash Highway
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22
Enter the roundabout and take exit 2 toward Chumash Highway
43 m · 2 sec · Chumash Highway
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23
Exit the roundabout onto Chumash Highway
6.3 mi · 10 min · Chumash Highway
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24
Take the ramp right toward US 101 North
1138 ft · 31 sec
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25
Merge slight left
7.4 mi · 8 min
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26
Take the exit slight right toward CA 135: Los Alamos
750 ft · 21 sec
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27
Turn straight onto San Antonio Boulevard
643 ft · 11 sec · San Antonio Boulevard
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28
Turn straight onto Foxen Lane
149 m · 9 sec · Foxen Lane
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29
Turn right onto Bell Street
1909 ft · 34 sec · Bell Street
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30
Turn right onto Helena Street
115 m · 21 sec · Helena Street
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31
Arrive at your destination
0 m · 1 sec · Leslie Street
Car Route Details
A richer read on the saved driving route between San Diego and Los Alamos.
Highway-focused drive
Most of the mileage stays on named highways, so the important moments are ramps, exits, merges, and the final local approach.
Ventura Freeway
Merge slight right onto Ventura Freeway
46.9 mi · 00h 54m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A longer out-and-back drive
This is still possible in one day, but it becomes a long driving day. Leaving early and planning your stop window matters more here.
Sunny leaving San Diego and Sunny near Los Alamos.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from San Diego to Los Alamos?
The road trip is about 263.2 miles (423.5 km) and usually takes 05h 17m in normal driving conditions.
Is this a same-day trip or an overnight route?
This is still possible in one day, but it becomes a long driving day. Leaving early and planning your stop window matters more here.
What is the halfway point on this route?
Beverly Hills is a useful midpoint, sitting about 131.2 miles from San Diego and 132 miles from Los Alamos.
How much longer is the road route than the straight-line distance?
The direct path is about 227.2 miles (365.7 km), while the road route adds roughly 36 extra miles because roads do not follow the straight air line.
When is the best time to leave for this route?
A good departure window is usually 6:00 AM to 8:00 AM PDT. If you want a more comfortable same-day return, try to leave by 6:26 AM PDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $58.16 one way or $116.33 round trip. Estimated CO2 is about 82.6 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around San Diego and Sunny near Los Alamos.
Stop Ideas Near Beverly Hills
Useful break, food, and waypoint ideas within about 15 miles of the route midpoint.
Beverly Wilshire, A Four Seasons Hotel
City of Beverly Hills Parking Lot
City of Los Angeles
Vernon City Hall
Transit and Meeting Points
Useful pickup, handoff, or rendezvous points close to Beverly Hills.
Westwood-UCLA, CA
Westchester, CA
Burbank Airport–South station
Glendale Transportation Center
Flight Path Map
This map shows the direct air route between San Diego and Los Alamos. Straight-line distance: 227.26 mi (365.74 km).
#1 San Diego
The eighth most populous city in the United States and the center of the San Diego metropolitan area.
| Population | 1,422,420 |
| Coordinates | 32.7157100, -117.1647200 |
| Altitude | 20 |
| Country | United States |
#2 Los Alamos
Situated in Santa Barbara County's Santa Ynez Valley at an elevation of 571 feet, this census-designated place lies within a region dominated by agriculture and viticulture.
| Population | 0 |
| Coordinates | 34.7444300, -120.2782100 |
| Altitude | 174 |
| Country | United States |
End: Los Alamos (-120.27821, 34.74443)
Estimated Travel Time
Distance: 424 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 08h 46m |
| 40 mph (64.37 km/h) | 06h 34m |
| 50 mph (80.47 km/h) | 05h 15m |
| 60 mph (96.56 km/h) | 04h 23m |
| 70 mph (112.65 km/h) | 03h 45m |
| 80 mph (129 km/h) | 03h 17m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $6.26 | $58.16 | $116.33 |
| Mid-grade | $6.50 | $60.38 | $120.75 |
| Premium | $6.69 | $62.14 | $124.28 |
| Diesel | $8.41 | $78.16 | $156.31 |
Assumes 8.3 L/100 km (about 28.3 MPG). CO2 is an estimate and varies by vehicle, fuel blend, traffic, and terrain.
Prices in California · Oct 15, 2026