How far is Katy, TX from San Antonio, TX?
The driving distance from Katy, TX to San Antonio, TX is about 169 miles (271.9 km), with a travel time of about 02h 37m by car.
- The straight-line flight distance is about 162.3 miles (261.2 km).
- For a round trip, plan for roughly 05h 14m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 8:00 AM to 10:00 AM CDT.
Reverse, save, or send this route
This route works well as a day trip with time at the destination. Copy the route link, send it to another device, or print a clean version before you head out.
This route works well as a day trip with time at the destination.
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 02h 37m.
A morning start gives you useful time at the destination and keeps the return out of the late evening.
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.
Town in Fayette County, Texas, United States
Route Weather Snapshot
Check the forecast at both ends before you head out.
Chance Showers And Thunderstorms then Showers And Thunderstorms
Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms
Driving Route Map
The map below follows the saved road route between Katy and San Antonio.
Turn-by-Turn Driving Directions
Step-by-step road directions between Katy and San Antonio.
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1
Start on Highway Boulevard
1.3 mi · 2 min · Highway Boulevard
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2
Turn left onto Cane Island Parkway
2865 ft · 1 min · Cane Island Parkway
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3
Enter the roundabout and take exit 2 toward Cane Island Parkway
45 m · 3 sec · Cane Island Parkway
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4
Exit the roundabout onto Cane Island Parkway
46 m · 3 sec · Cane Island Parkway
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5
Take the ramp slight right toward I 10 West
2762 ft · 1 min
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6
Merge slight left onto Katy Freeway
144.7 mi · 2 hr 26 min · Katy Freeway
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7
Keep slight left
12 mi · 13 min
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8
Keep slight left to continue on 90th Infantry Division Highway
1.2 km · 52 sec · 90th Infantry Division Highway
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9
Continue on Jose Lopez Freeway
1.6 mi · 2 min · Jose Lopez Freeway
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10
Take the exit slight right toward Commerce Street, Houston Street
790 ft · 19 sec
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11
Turn straight onto Interstate 10 East
1830 ft · 39 sec · Interstate 10 East
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12
Turn right onto East Houston Street
963 ft · 20 sec · East Houston Street
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13
Turn slight left onto East Commerce Street
4.3 mi · 7 min · East Commerce Street
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14
Turn left onto Military Plaza
119 m · 16 sec · Military Plaza
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15
Turn left onto Dolorosa Street
100 m · 8 sec · Dolorosa Street
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16
Arrive at your destination
0 m · 1 sec · Dolorosa Street
Car Route Details
A richer read on the saved driving route between Katy 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
145 mi · 02h 26m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A comfortable day-trip route
This route works well as a day trip. You can leave in the morning, spend meaningful time at the destination, and still return the same day.
Chance Showers And Thunderstorms then Showers And Thunderstorms leaving Katy and Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms near San Antonio.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Katy to San Antonio?
The road trip is about 169 miles (271.9 km) and usually takes 02h 37m in normal driving conditions.
Is this a same-day trip or an overnight route?
This route works well as a day trip. You can leave in the morning, spend meaningful time at the destination, and still return the same day.
What is the halfway point on this route?
Flatonia is a useful midpoint, sitting about 83.2 miles from Katy and 85.7 miles from San Antonio.
How much longer is the road route than the straight-line distance?
The direct path is about 162.3 miles (261.2 km), while the road route adds roughly 6.7 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 8:00 AM to 10:00 AM CDT. If you want a more comfortable same-day return, try to leave by 1:16 PM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $22.52 one way or $45.05 round trip. Estimated CO2 is about 53 kg one way.
What should you check before leaving?
Before you leave, expect Chance Showers And Thunderstorms then Showers And Thunderstorms around Katy and Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms near San Antonio.
Stop Ideas Near Flatonia
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 Flatonia.
San Marcos Station
Austin
Taylor
Prairie View, TX
Flight Path Map
This map shows the direct air route between Katy and San Antonio. Straight-line distance: 162.28 mi (261.17 km).
#1 Katy
City in Texas, United States; within the Houston–The Woodlands–Sugar Land metropolitan area
| Population | 23,889 |
| Coordinates | 29.7857900, -95.8244000 |
| Altitude | 42 |
| 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: 272 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 05h 37m |
| 40 mph (64.37 km/h) | 04h 13m |
| 50 mph (80.47 km/h) | 03h 22m |
| 60 mph (96.56 km/h) | 02h 48m |
| 70 mph (112.65 km/h) | 02h 24m |
| 80 mph (129 km/h) | 02h 06m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.78 | $22.52 | $45.05 |
| Mid-grade | $4.25 | $25.34 | $50.68 |
| Premium | $4.59 | $27.36 | $54.72 |
| Diesel | $3.99 | $23.80 | $47.60 |
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 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.