How far is San Antonio, TX from Katy, TX?
The driving distance from San Antonio, TX to Katy, TX is about 166.6 miles (268.1 km), with a travel time of about 02h 53m by car.
- The straight-line flight distance is about 162.3 miles (261.2 km).
- For a round trip, plan for roughly 05h 46m 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 53m.
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 Slight Chance Showers And Thunderstorms
Chance Showers And Thunderstorms then Showers And Thunderstorms
Driving Route Map
The map below follows the saved road route between San Antonio and Katy.
Turn-by-Turn Driving Directions
Step-by-step road directions between San Antonio and Katy.
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1
Start on Dolorosa Street
44 m · 5 sec · Dolorosa Street
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2
Continue on West Market Street
1893 ft · 42 sec · West Market Street
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3
Continue on East Market Street
2143 ft · 46 sec · East Market Street
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4
Turn left
111 m · 13 sec
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5
Turn straight onto East Commerce Street
1.2 km · 1 min · East Commerce Street
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6
Keep slight left to continue on East Commerce Street
2.7 mi · 4 min · East Commerce Street
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7
Turn slight right onto East Houston Street
1349 ft · 31 sec · East Houston Street
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8
Turn left onto Interstate 10 East
583 ft · 12 sec · Interstate 10 East
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9
Take the ramp slight left toward I 10 East, US 90 East
874 ft · 21 sec
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10
Merge slight left onto Jose Lopez Freeway
1.8 mi · 2 min · Jose Lopez Freeway
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11
Continue on 90th Infantry Division Highway
22.2 mi · 23 min · 90th Infantry Division Highway
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12
Continue on I 10 East: Houston, Austin, Waco
136.4 mi · 2 hr 17 min
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13
Take the exit slight right toward FM 1463
1076 ft · 26 sec
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14
Turn straight onto Katy Freeway Frontage Road
570 ft · 14 sec · Katy Freeway Frontage Road
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15
Turn left onto FM 1463
1.1 km · 1 min · FM 1463
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16
Turn right onto Highway Boulevard
1944 ft · 35 sec · Highway Boulevard
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17
Arrive at your destination
0 m · 1 sec · Highway Boulevard
Car Route Details
A richer read on the saved driving route between San Antonio and Katy.
Highway-focused drive
Most of the mileage stays on named highways, so the important moments are ramps, exits, merges, and the final local approach.
I 10 East
Continue on I 10 East: Houston, Austin, Waco
136 mi · 02h 17m
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 Slight Chance Showers And Thunderstorms leaving San Antonio and Chance Showers And Thunderstorms then Showers And Thunderstorms near Katy.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from San Antonio to Katy?
The road trip is about 166.6 miles (268.1 km) and usually takes 02h 53m 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 83.1 miles from San Antonio and 83.5 miles from Katy.
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 4.3 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 12:44 PM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $22.22 one way or $44.44 round trip. Estimated CO2 is about 52.3 kg one way.
What should you check before leaving?
Before you leave, expect Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms around San Antonio and Chance Showers And Thunderstorms then Showers And Thunderstorms near Katy.
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 San Antonio and Katy. Straight-line distance: 162.28 mi (261.17 km).
#1 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 |
#2 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 |
End: Katy (-95.8244, 29.78579)
Estimated Travel Time
Distance: 268 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 05h 33m |
| 40 mph (64.37 km/h) | 04h 09m |
| 50 mph (80.47 km/h) | 03h 19m |
| 60 mph (96.56 km/h) | 02h 46m |
| 70 mph (112.65 km/h) | 02h 22m |
| 80 mph (129 km/h) | 02h 04m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.78 | $22.22 | $44.44 |
| Mid-grade | $4.25 | $25.00 | $50.00 |
| Premium | $4.59 | $27.00 | $53.99 |
| Diesel | $3.99 | $23.48 | $46.96 |
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.