Trip from Southlake, TX to San Antonio, TX

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Compiled and reviewed by the US Trip Planner planning team at COD Solutions Oy · Last reviewed Jul 20, 2026 · Editorial standards

Drive Time

5h 16m

Distance

287.1 mi

462 km

Drive Score

9/10

Great drive

Same Day?

Yes, doable

Fuel Cost

$39

one way

EV Charging

Unknown

Best Time to Leave

Save up to 41 min

4 AM

5h 3m ★

6 AM

5h 17m

8 AM

5h 44m

10 AM

5h 26m

12 PM

5h 23m

3 PM

5h 27m

5 PM

5h 42m

8 PM

5h 9m

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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Southlake, TX

Wikimedia Commons

San Antonio, TX

Wikimedia Commons

Trip Overview

Southlake, TX to San Antonio, TX is 287.1 miles and takes about 5h 16m via I 35, with a fuel budget near $43 and enough daylight to finish in a day. This trip stays within the Great Plains region, offering a fairly direct path south. With over half the drive on highways, it's a straightforward connection between two Texas cities. Consider this route if you need an efficient way to get from the Dallas-Fort Worth area to San Antonio, as it's designed for speed over scenic detours.

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

143.6 miles from Southlake, TX

A natural place for your longest stop of the day , about 2h 39m into the drive .

Main Roads

Road	Distance	Duration
Purple Heart Trail	99.6 mi	1h 46m
North South Freeway	85 mi	1h 28m
I 35	55.8 mi	58m
North Pan Am Expressway	17 mi	20m
Airport Freeway	9.5 mi	11m
North Jack Kultgen Expressway	6.6 mi	7m
Precinct Line Road	4.9 mi	9m
West Southlake Boulevard	2.1 mi	3m

Longest stretch: Purple Heart Trail — 99.6 mi, about 1h 46m

Traffic on I-35

Hour-of-day weekday pattern from 108 FHWA count stations on your route.

Peak

3 PM

~3,524 veh/hr typical · worst 4,208

Quietest

2 AM

~595 veh/hr

Peak-to-quiet ratio

5.9×

busier at peak than in the quiet hours

12a 6a noon 6p 11p

Averaged across 52 weeks of 2023 FHWA Travel Monitoring Analysis System data. Weekday hours only (Mon–Fri).

Turn-by-Turn Driving Directions

Step-by-step road directions between Southlake, TX and San Antonio, TX.

Start on FM 1709

1.0 mi · 1 min · East Southlake Boulevard

Continue on FM 1709

2.1 mi · 3 min · West Southlake Boulevard

Use the left lane.

Turn left onto FM 1938

1.9 mi · 3 min · Davis Boulevard

Use the left lane.

Turn left onto FM 3029

4.9 mi · 9 min · Precinct Line Road

Turn right onto Airport Freeway

431 ft · 8 sec · Airport Freeway

Use the straight / right lanes.

Take the ramp

0.3 mi · 37 sec

Toward TX 121 South, TX 183 West Use the left lane.

Merge onto TX 121; TX 183

2.3 mi · 2 min · Airport Freeway

Use the straight / slight right lanes.

Keep slight right at fork onto TX 121

0.2 mi · 16 sec · Airport Freeway

Exit 25A Toward TX 121 South: Downtown, Fort Worth Use the slight right lane.

Continue on TX 121

6.9 mi · 8 min · Airport Freeway

Exit 24B Toward TX 121 South: Downtown, Ft Worth Use the straight / slight right lanes.

Keep slight left at fork

0.5 mi · 41 sec

Toward I 35W South, US 287 South, US 377 South: Waco Use the slight left lane.

Merge onto I 35W; US 287; US 377

85 mi · 1 hr 28 min · North South Freeway

Use the straight / slight right lanes.

Continue on I 35; US 77

6.6 mi · 7 min · North Jack Kultgen Expressway

Use the straight / slight right lanes.

Continue on I 35

38 mi · 39 min · Purple Heart Trail

Use the straight / slight right lanes.

Keep slight left at fork onto I 35

56 mi · 58 min · I 35

Use the straight / slight right lanes.

Keep slight left at fork onto I 35; US 290

50 mi · 54 min · Purple Heart Trail

Toward 32nd Street, Dean Keeton Street Use the slight left lane.

Continue on I 35

1.7 mi · 1 min · Interstate Highway 35

Use the straight / slight right lanes.

Continue on I 35

12 mi · 12 min · Purple Heart Trail

Use the straight / slight right lanes.

Continue on I 35

10.0 mi · 11 min · North Pan Am Expressway

Use the straight / slight right lanes.

Keep slight left at fork onto I 35

6.4 mi · 8 min · North Pan Am Expressway

Toward I 35 South Use the straight / slight right lanes.

Keep slight left at fork onto I 35

0.6 mi · 41 sec · North Pan Am Expressway

Toward I 35 South: Lower Level, Laredo Use the slight left lane.

Take the exit

0.1 mi · 16 sec

Exit 157A Toward Lexington Avenue, Main Avenue, San Pedro Avenue Use the slight right lane.

Turn straight onto East Elmira Street

526 ft · 17 sec · East Elmira Street

Use the left / straight lanes.

Turn left onto North Main Avenue

0.2 mi · 18 sec · North Main Avenue

Use the left / straight lanes.

Enter roundabout onto Navarro Street

159 ft · 3 sec · Navarro Street

Continue on Navarro Street

111 ft · 2 sec · Navarro Street

Keep slight right at fork onto North Main Avenue

0.4 mi · 51 sec · North Main Avenue

Use the slight left / slight right lanes.

Turn right onto West Travis Street

222 ft · 10 sec · West Travis Street

Turn left onto North Flores Street

0.2 mi · 20 sec · North Flores Street

Continue on Military Plaza

392 ft · 15 sec · Military Plaza

Turn left onto Dolorosa Street

327 ft · 8 sec · Dolorosa Street

Arrive at destination

Dolorosa Street

Trip Plan

Given the 5h 16m estimated drive time, you can comfortably complete this trip in a single day. Leaving Southlake in the morning, perhaps around 9 AM, should get you to San Antonio by mid-afternoon. The longest stretch without a break is about 99.6 miles, so plan for one stop around the halfway point for fuel and a stretch. Keep an eye on your fuel gauge, especially when you're between major highway segments, as services can be more spread out in those areas. The $43 fuel estimate is a good baseline, but always check current prices.

Morning Departure

An early start around 7-8 AM gets you there with plenty of daylight left.

Evening Departure

A late afternoon start means arriving after dark. Morning is better.

You can normally do this drive in one day.

Plan roughly 1 meaningful break for fuel, food, and rest.

The halfway point lands around 143.6 miles from Southlake, TX, or about 2h 39m into the drive.

The longest continuous stretch on this route runs about 99.6 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 63 miles or 1h 14m in

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

Halfway reset

Around 143.6 miles or 2h 39m in

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

Final approach

Final hour starts around 4h 17m

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

Before You Leave

Open the route before leaving Southlake, 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 Southlake, TX

This is one driving day of about 287.1 miles and 5h 16m.

Your first comfortable stop window is around 63 miles from Southlake, 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 Purple Heart Trail for about 99.6 miles.

Where to Stop

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

Mid-route town

Meal stop

Troy, TX

144 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

Italy, TX

Fuel and coffee

A short stop after about 63 miles helps settle the day before fatigue starts building.

Troy, TX

Meal break

The midpoint is around 143.6 miles from Southlake, TX, which is a good place for a longer meal and fuel stop.

Before the longest stretch

Hours: 9 am–10 pm

+12102271373

Visit website

Place data sourced from public business listings. Hours and availability may vary.

Heads-up: tricky spots

5 of 21

5 decision points cluster between mile 12.5 and 285.9 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.

12.5 mi into trip | ~21m in | TX 121 / Airport Freeway

Keep slight right at fork onto TX 121 / Airport Freeway toward TX 121 South: Downtown, Fort Worth

Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one

Use the slight right lane. Exit 25A Toward TX 121 South: Downtown, Fort Worth

19.7 mi into trip | ~29m in

Keep slight left at fork toward I 35W South, US 287 South, US 377 South: Waco

Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one

Use the slight left lane. Toward I 35W South, US 287 South, US 377 South:...

205.6 mi into trip | ~3h 44m in | I 35; US 290 / Purple Heart Trail

Keep slight left at fork onto I 35; US 290 / Purple Heart Trail toward 32nd Street, Dean Keeton Street

Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one

Use the slight left lane. Toward 32nd Street, Dean Keeton Street

285.4 mi into trip | ~5h 13m in | I 35 / North Pan Am Expressway

Keep slight left at fork onto I 35 / North Pan Am Expressway toward I 35 South: Lower Level, Laredo

Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one

Use the slight left lane. Toward I 35 South: Lower Level, Laredo

285.9 mi into trip | ~5h 13m in

Take the exit toward Lexington Avenue, Main Avenue, San Pedro Avenue

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

Use the slight right lane. Exit 157A Toward Lexington Avenue, Main Avenue, San Pedro...

Fuel & Cost

Regular Gas

$39.32 one way

$78.65 round trip

$3.48/gal 25.4 MPG avg 101 kg CO₂

Fuel Type	$/gal	One Way	Round Trip
midgrade	$3.89	$43.92	$87.85
premium	$4.23	$47.76	$95.51
diesel	$4.80	$54.21	$108.42

No toll roads detected on this route.

Estimated Trip Cost (one way, 1 person)

Fuel

$39

Meals

$25–$50

Total

$64–$89

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

Estimated CO2 emission: 100.5 kg one way. Prices: EIA weekly data, 2026-07-13.

Driving Electric?

About $30 in charging · 1 stop · 66% less CO₂

Vehicle Type	kWh	Stops	DC Fast	Home Charge
Average EV	86.1	1	$30.15	$13.78
Efficient EV	71.8	0	$25.12	$11.48
EV Truck/SUV	114.8	1	$40.19	$18.37

Gas CO2

100 kg

EV CO2

34 kg (66% 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 as of Jul 19, 2026

Origin

Southlake, TX

Late night in Southlake on Monday

Local time

2:39 AM

CDT

Current temp

82°F

Unavailable

Live forecast

Destination

San Antonio, TX

Late night in San Antonio on Monday

Local time

2:39 AM

CDT

Current temp

94°F

Partly Sunny

SSE 5 to 10 mph 1% chance Live forecast

96°F

Troy, TX

144 mi in

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

12 degrees warmer at arrival

A meaningful temperature swing is a good cue to rethink layers, water, and how soon you want to arrive.

Road read

5h 16m on the road

An early start around 7-8 AM gets you there with plenty of daylight left.

Weather data from the National Weather Service. Conditions may change; check closer to your travel date.

National Parks Near This Route

Worth a detour if your schedule allows.

Waco Mammoth National Monument

National Monument

Standing as tall as 14 feet and weighing 20,000 pounds, Columbian mammoths roamed across what is present-day Texas thousands of years ago. Today, the fossil specimens represent the nation's first and...

5 mi from route ~14 min detour Free near mile 108.9

View on nps.gov

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 near mile 287.1

View on nps.gov

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

What kind of drive is this?

This route is mostly highway, with 61% of the 287.1 miles on major freeways like I 35. You'll encounter a long stretch of 99.6 miles on the Purple Heart Trail before merging onto the North South Freeway and then I 35. Expect dense exits and merges as you navigate between these high-speed corridors. The transition from highway to surface roads will be noticeable as you approach your destination.

61% highway — fuel and pacing are the main things to plan.

31 navigation steps total — most of the decisions cluster near the start and finish.

Longest single stretch: 99.6 mi on Purple Heart Trail.

How Hard Is This Drive?

8/10

This is a straightforward highway drive that stays mostly on Purple Heart Trail and North South Freeway. This route has several spots where lane changes, forks, or exits need your full attention. The trickiest moment comes around 12.5 miles in near TX 121 / Airport Freeway.

Driving Effort 8/10

Demanding - plan breaks and stay ahead of the key maneuvers

Balances navigation complexity with total wheel time.

This is a demanding drive. With 21 significant decision points across 287.1 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 12.5 miles (TX 121 / Airport Freeway): Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one; at 19.7 miles: Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one; at 205.6 miles (I 35; US 290 / Purple Heart Trail): Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one.

Elevation Profile

Mostly flat terrain

856 ft 482 ft

Total Climb

982 ft

Total Descent

972 ft

Highest Point

856 ft

~41 mi in

Elevation Range

375 ft

About the Cities

Starting in Southlake, TX

Full guide →

Founded 1956

Southlake is a city in the Dallas-Fort Worth Metroplex region of Texas. It was once chosen as the best place to live within the Dallas/Fort Worth area.

Arriving in San Antonio, TX

Full guide →

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

• Alamo Mission in San Antonio — historic place in San Antonio, Bexar County, Texas
• San Antonio Missions National Historical Park — historic district in San Antonio, Bexar County, Texas
• Fort Sam Houston — military base in San Antonio, Texas

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 5h 16m. Total distance: 287.1 miles.

Family Friendly

Moderate complexity with 1 natural rest stops along the way.

Solo Traveler

5h 16m drive, comfortable solo distance.

Frequently Asked Questions

The longest stretch is about 99.6 miles on Purple Heart Trail. The full list of main roads is in the Roads section above.

Yes — we found about 28 rest areas or service plazas within a short detour of the route (from OpenStreetMap). See the Rest Stops tab under Nearby Places for locations and mile markers. Plan to stretch, use the bathroom, and top off fluids every 2–3 hours on longer drives.

It helps. This route has a higher-than-average number of complex decision points, which get harder in the dark. If the last hour of the trip is on surface roads or mountain grades, aim to arrive at San Antonio, TX before sunset when you can. Check the Trip Plan for departure windows that land you in daylight.

Only with planning. This is a long drive for kids — consider splitting it into two days rather than pushing through. Plan at least 1 meaningful breaks. There are 28 rest areas along the route for bathroom stops.

Yes — Waco Mammoth National Monument and San Antonio Missions National Historical Park. See the National Parks section for detour distances and tips on detours.

Not recommended in a single day. At 5.3 hours each way, a round trip means 10.6 hours of driving — that is an unsafe level of fatigue for most drivers. Plan at least one night at San Antonio, TX before the return drive.

How this page is built

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, USGS 3DEP for elevation, NPS for national parks, and FHWA TMAS for hourly traffic volumes. See our methodology for refresh cadence and limitations.

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Explore more options from Southlake, TX or browse trips ending in San Antonio, TX.

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Trip from Southlake, TX to San Antonio, TX

Best Time to Leave

Trip Overview

Main Roads

Traffic on I-35

Turn-by-Turn Driving Directions

Trip Plan

Before You Leave

Where to Stop

Pacing Suggestions

Stops Along Your Drive

Bell County Northbound Rest Area

Service Plaza

Hill County Northbound Rest Area

Buc-ee's

Flying J Travel Center

Walburg Travel Center & Food Court

Buc-ee's

QuikTrip

QuikTrip

Ascent Travel Center

Love's Travel Stop

TA

Flying J Travel Plaza

Pilot Travel Center

Hill County Southbound Rest Area

QuikTrip

Road Ranger

Marlstone Retail Center

Love's Travel Stop

Love's Travel Stop

Buc-ee's

Pilot Travel Center

TA

Service Plaza

Bell County Southbound Rest Area

QuikTrip

Pilot Travel Center

Petro Stopping Centers

Spanish Governor's Palace

GO RIO San Antonio River Cruises

San Antonio | The Saga

Hemisfair

San Antonio Fire Museum

The Amazing Mirror Maze

SEA LIFE San Antonio

San Antonio River Lock & Dam

Heads-up: tricky spots

Fuel & Cost

Travel Intel

Southlake, TX

San Antonio, TX

Same local time

12 degrees warmer at arrival

5h 16m on the road

National Parks Near This Route

Waco Mammoth National Monument

San Antonio Missions National Historical Park

What kind of drive is this?

How Hard Is This Drive?

Elevation Profile

About the Cities

Starting in Southlake, TX

Arriving in San Antonio, TX

Who Is This Route For?

Frequently Asked Questions

Which road carries most of the drive?

Are there rest areas on this route?

Should I avoid arriving after dark?

Is this a good trip with kids?

Where does this route get tricky?

Are there national parks near this route?

Can I do this as a round trip in one go?

How this page is built

Explore More

Continue From San Antonio, TX

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