Compiled and reviewed by the US Trip Planner planning team at COD Solutions Oy · Last reviewed Apr 19, 2026 · Editorial standards
Drive Time
1h 37m
Distance
83.5 mi
134 km
Drive Score
8/10
Great drive
Same Day?
Yes, doable
Fuel Cost
$13
one way
EV Charging
Unknown
Estimated drive times based on typical traffic patterns. Actual times may vary with weather, construction, and real-time conditions.
San Antonio, TX
Wikimedia Commons
Harper, TX
Mark Direen
This 83.5-mile drive from San Antonio, TX to Harper, TX is a straightforward, one-day excursion, taking about 1 hour and 37 minutes. With 75% of the journey on highways, it's a route focused on efficient travel. Your estimated fuel cost for this trip is around $13, making it an economical option. The drive begins in the Great Plains region of Texas and stays within it, offering a consistent landscape. This route is perfectly suited for a single day, allowing for plenty of time at your destination or for spontaneous stops along the way.
Trip Pace
Same-day drive is realistic
A same-day return is realistic if you keep stops short.
Midpoint
41.7 miles from San Antonio, TX
A natural place for your longest stop of the day , about 47m into the drive .
| Road | Distance | Duration |
|---|---|---|
| I 10 | 49.5 mi | 50m |
| South Ranch Road 783 | 14.1 mi | 19m |
| McDermott Freeway | 12.8 mi | 14m |
| Harper Road | 3.3 mi | 5m |
| East Fredericksburg Road | 1.2 mi | 2m |
| Navarro Street | 0.8 mi | 1m |
| San Pedro Avenue | 0.6 mi | 1m |
| West US Highway 290 | 0.2 mi | <1m |
Step-by-step road directions between San Antonio, TX and Harper, TX.
Start on Dolorosa Street
Continue on West Market Street
Turn left onto Navarro Street
Enter roundabout onto San Pedro Avenue
Continue on San Pedro Avenue
Turn left onto West Cypress Street
Turn straight onto East Fredericksburg Road
Turn right onto Interstate 10 West
Take the ramp
Merge onto I 10; US 87
Keep slight right at fork onto I 10; US 87
Take the exit
At end of road, turn straight onto RM 783
Continue on RM 783
At end of road, turn right onto US 290; RM 783
Arrive at destination
For this relatively short 1 hour and 37-minute trip, you have the flexibility to leave whenever suits you best. Departing mid-morning could allow for a leisurely start and arrival in Harper with ample daylight. Given the longest stretch is 49.5 miles on I-10, plan your fuel stops accordingly before you get too far out. While there are no designated stops mentioned, keep an eye out for potential rest areas or quick service exits if needed. The overall fuel cost is a manageable $13, so you won't need to budget heavily for gas.
Morning Departure
Leave by 9 AM and you'll arrive before lunch.
Evening Departure
Even a 4 PM departure gets you there before dark in summer.
This is a comfortable same-day trip.
Departure
Before you leave
Start with fuel, water, and navigation already sorted so the first hour feels easy.
First stop
Around 18 miles or 22m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 41.7 miles or 47m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Final approach
Final hour starts around 1h 20m
Traffic, exits, and arrival timing usually matter more near Harper, TX than in the middle of the route.
Open the route before leaving San Antonio, TX so your first major turns are already loaded.
Day 1
Settle into the route from San Antonio, TX
This is one driving day of about 83.5 miles and 1h 37m.
Rest stops, refuel points, and overnight suggestions along this route.
Mid-route town
Meal stop
42 mi into the route
Best for: Lunch, fuel, and a longer reset
This sits close to the middle of the route, so it works well for the longest stop of the day.
A short stop after about 18 miles helps settle the day before fatigue starts building.
The midpoint is around 41.7 miles from San Antonio, TX, which is a good place for a longer meal and fuel stop.
These stop ideas are pacing suggestions — the exact town or exit can change with traffic, hotel plans, and fuel range.
5 decision points cluster between mile 1.6 and 65.5 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
Turn left onto West Cypress Street
Lane positioning matters here
Take the ramp toward I 10 West, US 87 North
Multiple destination signs - pick the right one
Merge onto I 10; US 87 / McDermott Freeway
Merge point - match speed before joining. Lane positioning matters here
Keep slight right at fork onto I 10; US 87
Highway fork - watch signs carefully. Lane positioning matters here
Take the exit toward FM 783: Kerrville, Harper
Exit ramp - move to the correct lane early. Multiple destination signs - pick the right one
Regular Gas
$12.62 one way
$25.23 round trip
| Fuel Type | $/gal | One Way | Round Trip |
|---|---|---|---|
| midgrade | $4.20 | $13.81 | $27.62 |
| premium | $4.54 | $14.91 | $29.82 |
| diesel | $5.61 | $18.44 | $36.87 |
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$13
Meals
$25–$50
Total
$38–$63
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 29.2 kg one way. Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $9 in charging · 0 stops · 66% less CO2
| Vehicle Type | kWh | Stops | DC Fast | Home Charge |
|---|---|---|---|---|
| Average EV | 25.1 | 0 | $8.77 | $4.01 |
| Efficient EV | 20.9 | 0 | $7.31 | $3.34 |
| EV Truck/SUV | 33.4 | 0 | $11.69 | $5.34 |
Gas CO2
29 kg
EV CO2
10 kg (66% less)
This trip is well within single-charge range for most EVs. No charging stops needed if you start fully charged.
DC fast charging avg $0.35/kWh. Home charging avg $0.16/kWh. US grid CO2: 0.39 kg/kWh.
Current conditions at both ends of the drive.
Origin
Late night in San Antonio on Sunday
Local time
2:46 AM
CDT
Current temp
90°F
Partly Sunny
Destination
Late night in Harper on Sunday
Local time
2:46 AM
CDT
Current temp
70°F
Unavailable
Seasonal Notes
Summer travel usually means heavier construction, hotter rest stops, and busier weekend traffic around major cities.
Winter travel shortens daylight, so a route that looks manageable on paper can feel much longer after dark.
Holiday weekends tend to make both departure and arrival windows slower than the raw route time suggests.
Time zone
Origin and destination are on the same clock, so arrival timing is easier to judge at a glance.
Temperature spread
A meaningful temperature swing is a good cue to rethink layers, water, and how soon you want to arrive.
Road read
The weather snapshot is not static. If you are leaving later, give both cities one more quick forecast check before departure.
Weather data from the National Weather Service. Conditions may change; check closer to your travel date.
Worth a detour if your schedule allows.
National Historical Park
Welcome to San Antonio Missions, a National Park Service site and the only UNESCO World Heritage Site in Texas. Each mission in the park is a center of community and has been since the early 1700s. Th...
National Historical Park
Lyndon B. Johnson National Historical Park tells the story of our 36th president beginning with his ancestors until his final resting place on his beloved LBJ Ranch. This entire "circle of life" gives...
Park data from the National Park Service API. Alerts update every 2 hours.
Primarily a highway-focused drive, you'll spend about 75% of your time on major roads like I-10 and McDermott Freeway. The longest uninterrupted stretch is a significant 49.5 miles on I-10, offering a chance to settle into a steady pace. As you transition to South Ranch Road 783, the character of the drive may shift, offering a different feel compared to the interstate. Expect a mostly efficient and direct journey with minimal delays.
This is a straightforward highway drive that stays mostly on I 10 and South Ranch Road 783. You will hit about 9 points where you need to pay attention to lane position or signs. The trickiest moment comes around 1.6 miles in near West Cypress Street.
Moderate - straightforward overall, but long enough or busy enough to require pacing
Balances navigation complexity with total wheel time.
This drive requires moderate attention. Across 83.5 miles you will encounter 9 spots where lane choice or exit timing matters. Not difficult for experienced highway drivers, but worth previewing the tricky sections before you go.
Where does it get tricky?
The main spots that need attention: at 1.6 miles (West Cypress Street): Lane positioning matters here; at 3.1 miles: Multiple destination signs - pick the right one; at 3.2 miles (I 10; US 87 / McDermott Freeway): Merge point - match speed before joining. Lane positioning matters here.
Based on OSRM destination-sign hints, not a full list of every settlement the road passes.
On the drive from San Antonio, TX to Harper, TX, road signs begin pointing toward Fm 783: Kerrville along the way.
Fm 783: Kerrville
Founded 1718
San Antonio is the second largest city in the state of Texas and the 7th largest in the United States. It's the 24th largest metropolitan area in the country. Visited by more than 31 million annual visitors, San Antonio is a beautiful city at the axis of three different geological terrains: Hill Country, South Texas Plains and Prairie and Lakes. There's a lot to do in this city: fine art museums, historical missions and plenty of amusement parks in addition to great dining and lots of drinking. The culture and people are vibrant and interesting. San Antonio's downtown is one of the most lively in the nation.
Top landmarks
City content from Wikivoyage (CC BY-SA 4.0) and Wikidata (CC0).
Weekend Trip
Doable as a same-day drive at 1h 37m. Total distance: 83.5 miles.
Family Friendly
Moderate complexity with 0 natural rest stops along the way.
Solo Traveler
1h 37m drive, comfortable solo distance.
First-Time Driver
Mostly highway driving (75%). Some complex stretches to watch for.
Compiled by the US Trip Planner planning team at COD Solutions Oy from open government datasets — OSRM over OpenStreetMap for geometry, EIA for fuel prices, and NPS for national parks. See our methodology for refresh cadence and limitations.
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