How far is San Antonio, TX from Harper, TX?
The driving distance from San Antonio, TX to Harper, TX is about 83.5 miles (134.4 km), with a travel time of about 01h 37m by car.
- The straight-line flight distance is about 75.4 miles (121.3 km).
- For a round trip, plan for roughly 03h 14m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 8:00 AM to 10:00 AM CST.
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 01h 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.
Sense of physical or psychological ease; state of being comfortable and free from stress
Route Weather Snapshot
Check the forecast at both ends before you head out.
Mostly Cloudy
Driving Route Map
The map below follows the saved road route between San Antonio and Harper.
Turn-by-Turn Driving Directions
Step-by-step road directions between San Antonio and Harper.
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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
1042 ft · 28 sec · West Market Street
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3
Turn left onto Navarro Street
1.3 km · 2 min · Navarro Street
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4
Enter the roundabout and take exit 2 toward San Pedro Avenue
26 m · 2 sec · San Pedro Avenue
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5
Exit the roundabout onto San Pedro Avenue
2891 ft · 1 min · San Pedro Avenue
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6
Turn left onto West Cypress Street
604 ft · 10 sec · West Cypress Street
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7
Turn straight onto East Fredericksburg Road
1.2 mi · 2 min · East Fredericksburg Road
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8
Turn right onto Interstate 10 West
657 ft · 13 sec · Interstate 10 West
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9
Take the ramp slight left toward I 10 West, US 87 North
553 ft · 14 sec
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10
Merge slight left onto McDermott Freeway
12.8 mi · 15 min · McDermott Freeway
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11
Keep slight right
49.5 mi · 50 min
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12
Take the exit slight right toward FM 783: Kerrville, Harper
1261 ft · 31 sec
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13
At the end of the road, turn straight onto Harper Road
3.3 mi · 6 min · Harper Road
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14
Continue on South Ranch Road 783
14.1 mi · 19 min · South Ranch Road 783
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15
At the end of the road, turn right onto West US Highway 290
1256 ft · 27 sec · West US Highway 290
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16
Arrive at your destination
0 m · 1 sec · West US Highway 290
Car Route Details
A richer read on the saved driving route between San Antonio and Harper.
Highway-focused drive
Most of the mileage stays on named highways, so the important moments are ramps, exits, merges, and the final local approach.
McDermott Freeway
Keep slight right
49.5 mi · 00h 50m
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.
Sunny leaving San Antonio and Mostly Cloudy near Harper.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from San Antonio to Harper?
The road trip is about 83.5 miles (134.4 km) and usually takes 01h 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?
Comfort is a useful midpoint, sitting about 41.8 miles from San Antonio and 41.8 miles from Harper.
How much longer is the road route than the straight-line distance?
The direct path is about 75.4 miles (121.3 km), while the road route adds roughly 8.1 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 CST. If you want a more comfortable same-day return, try to leave by 3:16 PM CST.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $10.56 one way or $21.13 round trip. Estimated CO2 is about 26.2 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around San Antonio and Mostly Cloudy near Harper.
Stop Ideas Near Comfort
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 Comfort.
San Antonio Station
San Marcos Station
Austin
Flight Path Map
This map shows the direct air route between San Antonio and Harper. Straight-line distance: 75.4 mi (121.34 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 Harper
Harper is a place in Texas, United States.
| Population | 0 |
| Coordinates | 30.2999200, -99.2442100 |
| Altitude | 626 |
| Country | United States |
End: Harper (-99.24421, 30.29992)
Estimated Travel Time
Distance: 134 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 02h 46m |
| 40 mph (64.37 km/h) | 02h 05m |
| 50 mph (80.47 km/h) | 01h 40m |
| 60 mph (96.56 km/h) | 01h 23m |
| 70 mph (112.65 km/h) | 01h 11m |
| 80 mph (129 km/h) | 01h 02m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.58 | $10.56 | $21.13 |
| Mid-grade | $4.09 | $12.08 | $24.15 |
| Premium | $4.47 | $13.19 | $26.38 |
| Diesel | $5.68 | $16.76 | $33.52 |
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 · Nov 06, 2026