How far is Kemah, TX from San Antonio, TX?
The driving distance from Kemah, TX to San Antonio, TX is about 231.8 miles (373 km), with a travel time of about 03h 43m by car.
- The straight-line flight distance is about 209 miles (336.4 km).
- For a round trip, plan for roughly 07h 26m 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 03h 43m.
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 Texas, United States
Route Weather Snapshot
Check the forecast at both ends before you head out.
Chance Showers And Thunderstorms
Mostly Cloudy
Driving Route Map
The map below follows the saved road route between Kemah and San Antonio.
Turn-by-Turn Driving Directions
Step-by-step road directions between Kemah and San Antonio.
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1
Start on the route
19 m · 6 sec
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2
Turn right
96 m · 10 sec
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3
Continue straight
2186 ft · 42 sec
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4
Turn right onto Deke Slayton Highway
1.5 mi · 2 min · Deke Slayton Highway
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5
Continue on East FM 518
2.3 mi · 4 min · East FM 518
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6
Continue straight
730 ft · 12 sec
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7
Turn straight onto North Egret Bay Boulevard
2.4 mi · 4 min · North Egret Bay Boulevard
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8
Turn left onto East NASA Parkway
1.5 km · 1 min · East NASA Parkway
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9
Continue on NASA Parkway
1.5 km · 2 min · NASA Parkway
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10
Turn slight right
52 m · 6 sec
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11
Turn slight right onto Gulf Freeway Frontage Road
2964 ft · 59 sec · Gulf Freeway Frontage Road
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12
Take the ramp slight left toward I 45 North
1158 ft · 28 sec
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13
Merge slight left onto Gulf Freeway
22.3 mi · 26 min · Gulf Freeway
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14
Take the exit slight left toward I 10 West: San Antonio
717 ft · 18 sec
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15
Merge slight left onto Katy Freeway
174.7 mi · 3 hr 2 min · Katy Freeway
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16
Keep slight left
12 mi · 13 min
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17
Keep slight left to continue on 90th Infantry Division Highway
1.2 km · 52 sec · 90th Infantry Division Highway
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18
Continue on Jose Lopez Freeway
1.6 mi · 2 min · Jose Lopez Freeway
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19
Take the exit slight right toward Commerce Street, Houston Street
790 ft · 19 sec
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20
Turn straight onto Interstate 10 East
1830 ft · 39 sec · Interstate 10 East
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21
Turn right onto East Houston Street
963 ft · 20 sec · East Houston Street
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22
Turn slight left onto East Commerce Street
4.3 mi · 7 min · East Commerce Street
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23
Turn left onto Military Plaza
119 m · 16 sec · Military Plaza
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24
Turn left onto Dolorosa Street
100 m · 8 sec · Dolorosa Street
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25
Arrive at your destination
0 m · 1 sec · Dolorosa Street
Car Route Details
A richer read on the saved driving route between Kemah and San Antonio.
Highway-focused drive
Most of the mileage stays on named highways, so the important moments are ramps, exits, merges, and the final local approach.
Katy Freeway
Merge slight left onto Katy Freeway
175 mi · 03h 02m
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.
Chance Showers And Thunderstorms leaving Kemah and Mostly Cloudy near San Antonio.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Kemah to San Antonio?
The road trip is about 231.8 miles (373 km) and usually takes 03h 43m 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?
Weimar is a useful midpoint, sitting about 112.8 miles from Kemah and 118.9 miles from San Antonio.
How much longer is the road route than the straight-line distance?
The direct path is about 209 miles (336.4 km), while the road route adds roughly 22.8 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 9:34 AM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $30.91 one way or $61.82 round trip. Estimated CO2 is about 72.7 kg one way.
What should you check before leaving?
Before you leave, expect Chance Showers And Thunderstorms around Kemah and Mostly Cloudy near San Antonio.
Stop Ideas Near Weimar
Useful break, food, and waypoint ideas within about 15 miles of the route midpoint.
Transit and Meeting Points
Useful pickup, handoff, or rendezvous points close to Weimar.
Prairie View, TX
Austin
San Marcos Station
Taylor
Flight Path Map
This map shows the direct air route between Kemah and San Antonio. Straight-line distance: 209.05 mi (336.43 km).
#1 Kemah
City in Galveston County, Texas, United States
| Population | 2,048 |
| Coordinates | 29.5427300, -95.0204800 |
| Altitude | 2 |
| Country | United States |
#2 San Antonio
The seventh most populous city in the United States and the center of the San Antonio metropolitan area.
| Population | 1,567,118 |
| Coordinates | 29.4241200, -98.4936300 |
| Altitude | 198 |
| Country | United States |
End: Dolorosa Street (-98.493645, 29.424163)
Estimated Travel Time
Distance: 373 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 07h 43m |
| 40 mph (64.37 km/h) | 05h 47m |
| 50 mph (80.47 km/h) | 04h 38m |
| 60 mph (96.56 km/h) | 03h 51m |
| 70 mph (112.65 km/h) | 03h 18m |
| 80 mph (129 km/h) | 02h 53m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.78 | $30.91 | $61.82 |
| Mid-grade | $4.25 | $34.78 | $69.56 |
| Premium | $4.59 | $37.55 | $75.11 |
| Diesel | $3.99 | $32.66 | $65.33 |
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 23, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.