Origin
San Antonio, TX
Night in San Antonio on Friday
Local time
11:52 PM
CDT
Current temp
77°F
Unavailable
Live forecast
Trip from San Antonio, TX to Karnes City, TX
Compiled and reviewed by the Trip.ovh planning team at COD Solutions Oy · Last reviewed Apr 18, 2026 · Editorial standards
Drive Time
1h 3m
Distance
53.9 mi
87 km
Drive Score
7/10
Good drive
Same Day?
Yes, doable
Fuel Cost
$8
one way
EV Charging
Unknown
Best Time to Leave
4 AM
0h 59m
★
6 AM
1h 4m
8 AM
1h 14m
10 AM
1h 7m
12 PM
1h 6m
3 PM
1h 8m
5 PM
1h 13m
8 PM
1h 1m
Estimated drive times based on typical traffic patterns. Actual times may vary with weather, construction, and real-time conditions.
San Antonio, TX
Wikimedia Commons
Karnes City, TX
Wikimedia Commons
Trip Overview
The drive from San Antonio, TX to Karnes City, TX covers 53.9 miles and takes about 1h 3m behind the wheel. This route is realistic as a one-day drive if you keep your stops efficient.
The route leans on US 181, Lucian Adams Freeway, William J Bordelon Freeway for much of the mileage, and the overall profile is highway-focused drive. The longest uninterrupted segment is about 43.2 miles on US 181. At current regular gas prices, budget about $8.14 one way before food or hotel costs.
About the Cities
Starting in San Antonio, TX
Full guide →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.
City content from Wikivoyage (CC BY-SA 4.0) and Wikidata (CC0).
Who Is This Route For?
Weekend Trip
Doable as a same-day drive at 1h 3m. Total distance: 53.9 miles.
Family Friendly
Moderate complexity with 0 natural rest stops along the way.
Solo Traveler
1h 3m drive, comfortable solo distance.
EV Driver
0 DC fast chargers along the route. Coverage: unknown.
First-Time Driver
Mostly highway driving (97%). Straightforward navigation.
Drive Character
This is a 1h 3m highway drive covering 53.9 miles, with most of the trip on US 181 and Lucian Adams Freeway. The longest continuous stretch is about 43.2 miles on US 181.
Most of the miles stay on highways, which makes pacing and fuel planning easier than turn-by-turn city driving.
There are about 10 navigation steps in the underlying route data, so the final approach matters more than the middle miles.
US 181 is the longest continuous segment at about 43.2 miles.
How Hard Is This Drive?
This is a straightforward highway drive that stays mostly on US 181 and Lucian Adams Freeway. Navigation is very simple - set it and forget it for most of the drive. The trickiest moment comes around 0.8 miles in near Tower of the Americas Way.
Driving Effort
2/10
Very easy - short and simple to drive
Balances navigation complexity with total wheel time.
The drive from San Antonio, TX to Karnes City, TX is easy. At 1h 3m with 97% highway, most drivers will find it relaxed and low-stress.
Where does it get tricky?
The main spots that need attention: at 0.8 miles (Tower of the Americas Way): Lane positioning matters here; at 1 miles: Multiple destination signs - pick the right one; at 1.2 miles (I 37; US 281 / William J Bordelon Freeway): Merge point - match speed before joining.
Critical Maneuvers
5 of 5 key pointsThese are the spots where you need to pay the most attention. Preview them before you drive.
5
0.8 mi into trip
|
~1m in
|
Tower of the Americas Way
Turn right onto Tower of the Americas Way
Lane positioning matters here
Use the right lane.
5
1 mi into trip
|
~1m in
Take the ramp toward I 37 South, US 281 South
Multiple destination signs - pick the right one
Toward I 37 South, US 281 South
3
1.2 mi into trip
|
~2m in
|
I 37; US 281 / William J Bordelon Freeway
Merge onto I 37; US 281 / William J Bordelon Freeway
Merge point - match speed before joining
7
10 mi into trip
|
~12m in
|
US 181
Take the exit onto US 181 toward US 181 South: Floresville
Exit ramp - move to the correct lane early. Lane positioning matters here
Use the slight right lane.
Exit 132
Toward US 181 South: Floresville
3
53.3 mi into trip
|
~1h 2m in
|
US 181 Business / West Calvert Avenue
Turn left onto US 181 Business / West Calvert Avenue
Navigation decision point
Main Roads
| Road | Distance | Duration |
|---|---|---|
| US 181 | 43.2 mi | 50m |
| Lucian Adams Freeway | 7.4 mi | 8m |
| William J Bordelon Freeway | 1.4 mi | 1m |
| West Calvert Avenue | 0.6 mi | 1m |
| East Market Street | 0.4 mi | <1m |
| West Market Street | 0.4 mi | <1m |
| Tower of the Americas Way | 0.2 mi | <1m |
| Dolorosa Street | <0.1 mi | <1m |
Longest stretch:
US 181
— 43.2 mi, about 50m
Turn-by-Turn Driving Directions
Step-by-step road directions between San Antonio, TX and Karnes City, TX.
1
Start on Dolorosa Street
143 ft
·
4 sec
·
Dolorosa Street
2
Continue on West Market Street
0.4 mi
·
42 sec
·
West Market Street
3
Continue on East Market Street
0.4 mi
·
40 sec
·
East Market Street
4
Turn right onto Tower of the Americas Way
0.2 mi
·
21 sec
·
Tower of the Americas Way
Use the right lane.
5
Take the ramp
0.3 mi
·
33 sec
Toward I 37 South, US 281 South
6
Merge onto I 37; US 281
1.4 mi
·
1 min
·
William J Bordelon Freeway
7
Continue on I 37; US 281
7.4 mi
·
8 min
·
Lucian Adams Freeway
Use the straight / slight right lanes.
8
Take the exit onto US 181
43 mi
·
50 min
·
US 181
Exit 132
Toward US 181 South: Floresville
Use the slight right lane.
9
Turn left onto US 181 Business
0.6 mi
·
1 min
·
West Calvert Avenue
10
Arrive at destination
US 181 Business
Where to Stop
Rest stops, refuel points, and overnight suggestions along this route.
Halfway Point
Midpoint
About 26.9 mi from San Antonio, TX · 31m into the drive
Mid-route town
Meal stop
27 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.
Pacing Suggestions
Fuel and coffee
A short stop after about 12 miles helps settle the day before fatigue starts building.
Meal break
The midpoint is around 26.9 miles from San Antonio, TX, which is a good place for a longer meal and fuel stop.
Arriving in Karnes City, TX
The final approach into Karnes City, TX usually feels slower than the middle of the drive, so avoid planning your tightest schedule at the very end.
These stop ideas are pacing suggestions — the exact town or exit can change with traffic, hotel plans, and fuel range.
Fuel & Cost
Regular Gas
$8.14 one way
$16.29 round trip
$3.84/gal
25.4 MPG avg
19 kg CO2
| Fuel Type | $/gal | One Way | Round Trip |
|---|---|---|---|
| midgrade | $4.20 | $8.91 | $17.83 |
| premium | $4.54 | $9.62 | $19.25 |
| diesel | $5.61 | $11.90 | $23.80 |
No toll roads detected on this route.
Drive Cost (one way)
Fuel
$8
Estimated CO2 emission: 18.9 kg one way. Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $6 in charging · 0 stops · 68% less CO2
| Vehicle Type | kWh | Stops | DC Fast | Home Charge |
|---|---|---|---|---|
| Average EV | 16.2 | 0 | $5.66 | $2.59 |
| Efficient EV | 13.5 | 0 | $4.72 | $2.16 |
| EV Truck/SUV | 21.6 | 0 | $7.55 | $3.45 |
Gas CO2
19 kg
EV CO2
6 kg (68% 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.
Travel Intel
Current conditions at both ends of the drive.
Destination
Karnes City, TX
Night in Karnes City on Friday
Local time
11:52 PM
CDT
Current temp
64°F
Unavailable
Live forecast
Time zone
Same local time
Origin and destination are on the same clock, so arrival timing is easier to judge at a glance.
Temperature spread
13 degrees cooler at arrival
A meaningful temperature swing is a good cue to rethink layers, water, and how soon you want to arrive.
Road read
1h 3m on the road
Use the two city cards together: check the sky where you start, then compare it with the local time and temperature at arrival.
Weather data from the National Weather Service. Conditions may change; check closer to your travel date.
Frequently Asked Questions
The drive from San Antonio, TX to Karnes City, TX covers 53.9 miles and takes about 1h 3m without stops. Add 15-30 minutes for a fuel or rest stop on longer drives.
The main roads are US 181, Lucian Adams Freeway, William J Bordelon Freeway. Most of the drive stays on highways, so watch for ramps and exits.
This is a comfortable same-day trip.
The midpoint is about 26.9 miles from San Antonio, TX. Look for rest areas, gas stations, or food options near the halfway mark.
At current regular gas prices, expect to spend about $8.14 one way. This estimate uses 25.4 MPG — your actual cost will vary with your vehicle's fuel efficiency and current gas prices.
Leave by 9 AM and you'll arrive before lunch. Even a 4 PM departure gets you there before dark in summer.
The drive from San Antonio, TX to Karnes City, TX is easy. At 1h 3m with 97% highway, most drivers will find it relaxed and low-stress.
The main spots that need attention: at 0.8 miles (Tower of the Americas Way): Lane positioning matters here; at 1 miles: Multiple destination signs - pick the right one; at 1.2 miles (I 37; US 281 / William J Bordelon Freeway): Merge point - match speed before joining.
The route from San Antonio, TX to Karnes City, TX does not surface many named destination signs beyond the main corridor.
Yes. Nearby national parks include San Antonio Missions National Historical Park.
How this page is built
Compiled by the Trip.ovh 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.
Was this helpful?
Thanks for your feedback!
Your tip has been submitted. Thanks!
/500
Recent Tips
·
Explore More
Continue From Karnes City, TX
More trips to Karnes City, TX
Explore more options from San Antonio, TX or browse trips ending in Karnes City, TX.
Looking for more statewide routes? Browse TX road trips.