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Trip from San Antonio, TX to San Augustine, TX

Drive Time

6h 23m

Distance

336.8 mi

542 km

Drive Score

8/10

Great drive

Same Day?

Yes, doable

Fuel Cost

$51

one way

EV Charging

None

0 DC fast

Best Time to Leave

Save up to 38 min
4 AM
6h 11m ★
6 AM
6h 24m
8 AM
6h 49m
10 AM
6h 33m
12 PM
6h 30m
3 PM
6h 34m
5 PM
6h 47m
8 PM
6h 16m

Estimated drive times based on typical traffic patterns. Actual times may vary with weather, construction, and real-time conditions.

Best Time Drive vs Fly
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Downtown San Antonio, TX, TX

San Antonio, TX

Wikimedia Commons

Downtown San Augustine, TX, TX

San Augustine, TX

Mark Direen

Trip Overview

The drive from San Antonio, TX to San Augustine, TX covers 336.8 miles and takes about 6h 23m behind the wheel. This route is realistic as a one-day drive if you keep your stops efficient.

The route leans on TX 21, State Highway 21 East, TX 103 for much of the mileage, and the overall profile is highway-focused drive. The longest uninterrupted segment is about 84.7 miles on TX 21. At current regular gas prices, budget about $51.45 one way before food or hotel costs.

Trip Pace

Same-day drive is realistic

A same-day return is possible, but it will make for a full day on the road.

Break Rhythm

1 planned break

Plan on a short reset every 3 to 4 hours to stay fresh behind the wheel.

Midpoint

168.4 miles from San Antonio, TX

A natural place for your longest stop of the day , about 3h 4m into the drive .

Drive Character

This is a 6h 23m highway drive covering 336.8 miles, with most of the trip on TX 21 and State Highway 21 East. The longest continuous stretch is about 84.7 miles on TX 21.

Most of the miles stay on highways, which makes pacing and fuel planning easier than turn-by-turn city driving.
There are about 39 navigation steps in the underlying route data, so the final approach matters more than the middle miles.
TX 21 is the longest continuous segment at about 84.7 miles.

How Hard Is This Drive?

This is a straightforward highway drive that stays mostly on TX 21 and State Highway 21 East. This route has several spots where lane changes, forks, or exits need your full attention. The trickiest moment comes around 0.8 miles in.

Route Complexity 8/10

Demanding - plan breaks and stay ahead of the key maneuvers

This is a demanding drive. With 20 significant decision points across 336.8 miles, you will need to stay alert — especially through interchange areas and urban stretches. Consider splitting it into segments if you are not comfortable with fast highway navigation.

Where does it get tricky?

The main spots that need attention: at 0.8 miles: Lane positioning matters here; at 4.6 miles (Interstate 10 East): Lane positioning matters here; at 4.7 miles: Lane positioning matters here. Multiple destination signs - pick the right one.

Critical Maneuvers

5 of 20 key points

These are the spots where you need to pay the most attention. Preview them before you drive.

6
0.8 mi into trip | ~1m in

Turn left

Lane positioning matters here

Use the left lane.
6
4.6 mi into trip | ~7m in | Interstate 10 East

Turn left onto Interstate 10 East

Lane positioning matters here

Use the left / straight lanes.
7
4.7 mi into trip | ~7m in

Take the ramp toward I 10 East, US 90 East

Lane positioning matters here. Multiple destination signs - pick the right one

Use the straight / slight left lanes. Toward I 10 East, US 90 East
8
39.7 mi into trip | ~44m in

Take the exit toward TX 130 Toll North: Austin, Waco

Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one

Use the straight / slight right lanes. Exit 614 Toward TX 130 Toll North: Austin, Waco
8
74.7 mi into trip | ~1h 16m in

Take the exit toward TX 21: Old Lockhart Road, Laws Road

Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one

Use the straight / slight right lanes. Exit 463 Toward TX 21: Old Lockhart Road, Laws Road

Towns Along This Route

Between San Antonio, TX and San Augustine, TX, road signs point toward Austin and Waco.

Austin

28.8 mi in | ~33m | via I 10; TX 130

Waco

28.8 mi in | ~33m | via I 10; TX 130

Main Roads

Road Distance Duration
TX 21 84.7 mi 1h 38m
State Highway 21 East 65.2 mi 1h 11m
TX 103 40.3 mi 42m
Pickle Parkway 34 mi 30m
TX 7 33 mi 36m
90th Infantry Division Highway 22.2 mi 23m
Camino Real 17.6 mi 20m
TX 147 11.1 mi 19m
Longest stretch: TX 21 — 84.7 mi, about 1h 38m

Turn-by-Turn Driving Directions

Step-by-step road directions between San Antonio, TX and San Augustine, 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 · 45 sec · East Market Street
4

Turn left

363 ft · 13 sec
Use the left lane.
5

Turn straight onto East Commerce Street

0.7 mi · 1 min · East Commerce Street
6

Keep slight left at fork onto East Commerce Street

2.7 mi · 4 min · East Commerce Street
7

Turn slight right onto East Houston Street

0.3 mi · 30 sec · East Houston Street
8

Turn left onto Interstate 10 East

0.1 mi · 11 sec · Interstate 10 East
Use the left / straight lanes.
9

Take the ramp

0.2 mi · 21 sec
Toward I 10 East, US 90 East Use the straight / slight left lanes.
10

Merge onto I 10; US 90

1.8 mi · 2 min · Jose Lopez Freeway
Use the straight / slight right lanes.
11

Continue on I 10; US 90

22 mi · 23 min · 90th Infantry Division Highway
Use the slight right lane.
12

Continue on I 10; TX 130

11 mi · 10 min · I 10; TX 130
Toward I 10 East: Houston, Austin, Waco Use the straight / slight right lanes.
13

Take the exit

1.0 mi · 2 min
Exit 614 Toward TX 130 Toll North: Austin, Waco Use the straight / slight right lanes.
14

Continue on TX 130 Toll

34 mi · 30 min · Pickle Parkway
Use the straight / slight right lanes.
15

Take the exit

0.2 mi · 31 sec
Exit 463 Toward TX 21: Old Lockhart Road, Laws Road Use the straight / slight right lanes.
16

Turn straight onto US 183

0.6 mi · 38 sec · US 183
17

Turn slight right

0.3 mi · 1 min
Toward TX 21 Use the straight / left / right lanes.
18

Turn right onto TX 21

18 mi · 20 min · Camino Real
19

Take the ramp onto TX 21

5.5 mi · 6 min · TX 21
Use the straight / slight right lanes.
20

Take the exit

0.2 mi · 26 sec
21

Turn straight onto College Street

0.9 mi · 1 min · College Street
22

Turn left onto TX 21; TX 95

0.4 mi · 35 sec · State Highway 95
Use the left lane.
23

Turn right onto TX 21; Loop 150

0.8 mi · 1 min · Chestnut Street
Use the right lane.
24

Continue on TX 21

65 mi · 1 hr 11 min · State Highway 21 East
25

Keep slight left at fork onto TX 21

79 mi · 1 hr 31 min · TX 21
26

At end of road, turn right onto TX 7; TX 21

33 mi · 36 min · TX 7; TX 21
27

Continue on TX 103

12 mi · 12 min · TX 103
28

Continue on Spur 339

2.0 mi · 3 min · North Raguet Street
29

Turn left onto Abney Avenue

0.7 mi · 1 min · Abney Avenue
30

Continue on Abney Avenue

474 ft · 12 sec · Abney Avenue
31

Continue on East Laurel Avenue

0.1 mi · 14 sec · East Laurel Avenue
32

Continue on Atkinson Drive

3.6 mi · 5 min · Atkinson Drive
33

Continue on TX 103

29 mi · 30 min · TX 103
34

Turn slight left onto TX 147

1.9 mi · 3 min · TX 147
35

Keep slight left at fork onto TX 147

9.2 mi · 16 min · TX 147
36

Turn right onto TX 21; TX 147

0.3 mi · 31 sec · West Main Street
37

Turn left onto FM 2213

373 ft · 12 sec · South Liberty Street
38

Turn right onto Loop 547

289 ft · 8 sec · Columbia Street
39

Arrive at destination

Loop 547

Trip Plan

Morning Departure

Start early — leave by 6-7 AM to arrive at a reasonable hour.

Evening Departure

This is a long drive — plan for a morning departure or consider splitting it into two days.

You can normally do this drive in one day.
Plan roughly 1 meaningful break for fuel, food, and rest.
The halfway point lands around 168.4 miles from San Antonio, TX, or about 3h 4m into the drive.
The longest continuous stretch on this route runs about 84.7 miles.

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 80 miles or 1h 23m in

Use this first pause for coffee, a restroom break, and a quick traffic check ahead.

Halfway reset

Around 168.4 miles or 3h 4m in

This is the best place for your longest stop, a real meal, and a full fuel check.

Final approach

Final hour starts around 5h 8m

Traffic, exits, and arrival timing usually matter more near San Augustine, TX than in the middle of the route.

Before You Leave

+

Open the route before leaving San Antonio, TX so your first major turns are already loaded.

+

Leave with enough water and a charging cable within reach, not packed away.

+

Check your fuel range against the first long segment, especially if you are starting outside city service areas.

Day 1

Settle into the route from San Antonio, TX

This is one driving day of about 336.8 miles and 6h 23m.

Your first comfortable stop window is around 80 miles from San Antonio, TX.
This route can stay practical as a one-day drive if traffic stays reasonable.
Plan about 1 real break rather than only quick fuel stops.
The longest stretch is on TX 21 for about 84.7 miles.

Where to Stop

Rest stops, refuel points, and overnight suggestions along this route.

Halfway Point

Midpoint

About 168.4 mi from San Antonio, TX · 3h 4m into the drive

Downtown Austin, TX, TX

Mid-route town

Meal stop

Austin, TX

168 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.

Popular next leg

Austin, TX to San Augustine, TX

266.4 mi · 5h 11m

Pacing Suggestions

Austin, TX

Fuel and coffee

A short stop after about 80 miles helps settle the day before fatigue starts building.

Austin, TX

Meal break

The midpoint is around 168.4 miles from San Antonio, TX, which is a good place for a longer meal and fuel stop.

Before the longest stretch

Fuel check

Top up before TX 21 if your tank is already low. That segment runs about 84.7 miles.

Arriving in San Augustine, TX

The final approach into San Augustine, TX usually feels slower than the middle of the drive, so avoid planning your tightest schedule at the very end.

Try to arrive with enough fuel left to skip an immediate station stop unless you already know the area around San Augustine, TX.

These stop ideas are pacing suggestions — the exact town or exit can change with traffic, hotel plans, and fuel range.

National Parks Near This Route

Worth a detour if your schedule allows.

San Antonio Missions National Historical Park

San Antonio Missions National Historical Park

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...

9 mi from route ~22 min detour Free
View on nps.gov

Park data from the National Park Service API. Alerts update every 2 hours.

Fuel & Cost

Regular Gas

$51.45 one way

$102.90 round trip

$3.88/gal 25.4 MPG avg 118 kg CO2
Fuel Type $/gal One Way Round Trip
midgrade $4.25 $56.38 $112.76
premium $4.59 $60.88 $121.75
diesel $5.64 $74.83 $149.65

No toll roads detected on this route.

Estimated Trip Cost (one way, 1 person)

Fuel

$51

Meals

$25–$50

Total

$76–$101

Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.

Estimated CO2 emission: 117.8 kg one way. Prices: EIA weekly data, 2026-04-06.

Driving Electric?

About $35 in charging · 1 stop · 67% less CO2

Vehicle Type kWh Stops DC Fast Home Charge
Average EV 101 1 $35.36 $16.17
Efficient EV 84.2 0 $29.47 $13.47
EV Truck/SUV 134.7 1 $47.15 $21.56

Gas CO2

118 kg

EV CO2

39 kg (67% less)

Plan for 1 charging stop. A 30-minute DC fast charge mid-route should be enough to complete the trip comfortably.

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.

Forecast data refreshed 4 days ago

Origin

San Antonio, TX

Morning in San Antonio on Monday

Local time

9:45 AM

CDT

Current temp

81°F

Unavailable

Live forecast

Destination

San Augustine, TX

Morning in San Augustine on Monday

Local time

9:45 AM

CDT

Current temp

65°F

Unavailable

Live forecast

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

Same local time

Origin and destination are on the same clock, so arrival timing is easier to judge at a glance.

Temperature spread

16 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

6h 23m on the road

Start early — leave by 6-7 AM to arrive at a reasonable hour.

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 San Augustine, TX covers 336.8 miles and takes about 6h 23m without stops. Add 15-30 minutes for a fuel or rest stop on longer drives.
The main roads are TX 21, State Highway 21 East, TX 103. Most of the drive stays on highways, so watch for ramps and exits.
This is a comfortable same-day trip.
The midpoint is about 168.4 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 $51.45 one way. This estimate uses 25.4 MPG — your actual cost will vary with your vehicle's fuel efficiency and current gas prices.
Start early — leave by 6-7 AM to arrive at a reasonable hour. This is a long drive — plan for a morning departure or consider splitting it into two days.
Plan about 1 meaningful break for fuel, food, or rest. Plan on a short reset every 3 to 4 hours to stay fresh behind the wheel.
This is a demanding drive. With 20 significant decision points across 336.8 miles, you will need to stay alert — especially through interchange areas and urban stretches. Consider splitting it into segments if you are not comfortable with fast highway navigation.
The main spots that need attention: at 0.8 miles: Lane positioning matters here; at 4.6 miles (Interstate 10 East): Lane positioning matters here; at 4.7 miles: Lane positioning matters here. Multiple destination signs - pick the right one.
Between San Antonio, TX and San Augustine, TX, road signs point toward Austin and Waco.

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Explore More

Return Trip

San Augustine, TX to San Antonio, TX

Plan the drive back the other way.

337.7 mi 6h 24m

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