How far is San Diego, TX from Houston, TX?
The driving distance from San Diego, TX to Houston, TX is about 250.5 miles (403.2 km), with a travel time of about 04h 09m by car.
- The straight-line flight distance is about 222.3 miles (357.7 km).
- For a round trip, plan for roughly 08h 18m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 6:00 AM to 8:00 AM CDT.
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 04h 09m.
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.
Census designated place
Route Weather Snapshot
Check the forecast at both ends before you head out.
Mostly Cloudy
Chance Showers And Thunderstorms
Driving Route Map
The map below follows the saved road route between San Diego and Houston.
Turn-by-Turn Driving Directions
Step-by-step road directions between San Diego and Houston.
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1
Start on the route
37 m · 4 sec
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2
Continue on East Gravis Avenue
10.6 mi · 12 min · East Gravis Avenue
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3
Continue on East Main Street
26.2 mi · 30 min · East Main Street
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4
Take the exit slight right
1 km · 1 min
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5
Turn left onto North US Highway 77
1.6 km · 2 min · North US Highway 77
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6
Take the ramp slight left toward County Road 44
1247 ft · 31 sec
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7
Merge slight left onto U.S. Highway 77
4.7 mi · 5 min · U.S. Highway 77
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8
Merge slight left
1.4 mi · 1 min
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9
Keep slight left
1.3 km · 50 sec
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10
Continue straight
141 m · 5 sec
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11
Take the exit slight right toward Sinton, Victoria
37.6 mi · 44 min
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12
Turn slight right onto United States Highway 77
33 mi · 37 min · United States Highway 77
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13
Keep slight left to continue on Spur 91
1.5 mi · 2 min · Spur 91
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14
Merge slight left onto US Highway 59 South
88.6 mi · 1 hr 38 min · US Highway 59 South
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15
Take the exit slight right
1551 ft · 38 sec
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16
Continue on 59 Northbound Frontage Road
1.6 mi · 2 min · 59 Northbound Frontage Road
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17
Continue straight
2146 ft · 59 sec
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18
Continue on US 59 Northbound Frontage Road
2 mi · 5 min · US 59 Northbound Frontage Road
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19
Continue on Southwest Freeway Frontage Road
1.3 mi · 3 min · Southwest Freeway Frontage Road
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20
Take the ramp slight left toward I 69 North, US 59 North
1304 ft · 32 sec
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21
Merge slight left onto Southwest Freeway
32.6 mi · 38 min · Southwest Freeway
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22
Keep slight left to continue on Richmond Avenue, Downtown via Louisiana Street
1.4 km · 1 min
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23
Take the exit slight right toward Downtown, Louisiana Street
47 m · 4 sec
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24
Continue on Louisiana Street
1.9 mi · 5 min · Louisiana Street
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25
Arrive at your destination
0 m · 1 sec · Louisiana Street
Car Route Details
A richer read on the saved driving route between San Diego and Houston.
Highway-focused drive
Most of the mileage stays on named highways, so the important moments are ramps, exits, merges, and the final local approach.
US Highway 59 South
Merge slight left onto US Highway 59 South
88.6 mi · 01h 38m
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.
Mostly Cloudy leaving San Diego and Chance Showers And Thunderstorms near Houston.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from San Diego to Houston?
The road trip is about 250.5 miles (403.2 km) and usually takes 04h 09m 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?
Inez is a useful midpoint, sitting about 123.8 miles from San Diego and 126.7 miles from Houston.
How much longer is the road route than the straight-line distance?
The direct path is about 222.3 miles (357.7 km), while the road route adds roughly 28.2 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 CDT. If you want a more comfortable same-day return, try to leave by 8:42 AM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $33.41 one way or $66.81 round trip. Estimated CO2 is about 78.6 kg one way.
What should you check before leaving?
Before you leave, expect Mostly Cloudy around San Diego and Chance Showers And Thunderstorms near Houston.
Flight Path Map
This map shows the direct air route between San Diego and Houston. Straight-line distance: 222.29 mi (357.74 km).
#1 San Diego
City in Duval County, Texas, United States
| Population | 4,188 |
| Coordinates | 27.7639100, -98.2389000 |
| Altitude | 94 |
| Country | United States |
#2 Houston
The fourth most populous city in the United States and the center of the Houston metropolitan area.
| Population | 2,316,120 |
| Coordinates | 29.7632800, -95.3632700 |
| Altitude | 12 |
| Country | United States |
End: Louisiana Street (-95.363596, 29.76347)
Estimated Travel Time
Distance: 403 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 08h 20m |
| 40 mph (64.37 km/h) | 06h 15m |
| 50 mph (80.47 km/h) | 05h 00m |
| 60 mph (96.56 km/h) | 04h 10m |
| 70 mph (112.65 km/h) | 03h 34m |
| 80 mph (129 km/h) | 03h 07m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.78 | $33.41 | $66.81 |
| Mid-grade | $4.25 | $37.59 | $75.18 |
| Premium | $4.59 | $40.58 | $81.17 |
| Diesel | $3.99 | $35.30 | $70.60 |
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 Texas · Apr 30, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.