Trip from Austin, TX to Harlingen, 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 49m

Distance

324.5 mi

522 km

Drive Score

9/10

Great drive

Same Day?

Yes, doable

Fuel Cost

$44

one way

EV Charging

Unknown

Best Time to Leave

Save up to 39 min

4 AM

5h 37m ★

6 AM

5h 50m

8 AM

6h 16m

10 AM

5h 59m

12 PM

5h 56m

3 PM

6h 0m

5 PM

6h 15m

8 PM

5h 42m

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

Best Time

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Austin, TX

Wikimedia Commons

city in Cameron County, Texas, United States

Harlingen, TX

Wikimedia Commons

Trip Overview

Austin to Harlingen is 324.5 miles and takes about 5h 49m via I 37 and U.S. Highway 77, with a fuel budget near $52 and enough daylight to finish in a day. This trip stays within the Great Plains region, primarily traversing Texas. You'll spend most of your time on major highways, making for a straightforward drive. It's a solid option if you're looking for an efficient way to get from the Austin area down to the Rio Grande Valley in a single day.

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

162.3 miles from Austin, TX

A natural place for your longest stop of the day , about 2h 52m into the drive .

Main Roads

Road	Distance	Duration
I 37	118.7 mi	1h 59m
U.S. Highway 77	88.2 mi	1h 37m
Purple Heart Trail	58.3 mi	1h 3m
I 69E	31.3 mi	33m
Connally Loop	11 mi	12m
North Pan Am Expressway	10 mi	11m
North Commerce Street	2.1 mi	3m
Interstate Highway 35	1.7 mi	1m

Longest stretch: I 37 — 118.7 mi, about 1h 59m

Traffic on I-35

Hour-of-day weekday pattern from 28 FHWA count stations on your route.

Peak

3 PM

~4,203 veh/hr typical

Quietest

3 AM

~766 veh/hr

Peak-to-quiet ratio

5.5×

busier at peak than in the quiet hours

12a 6a noon 6p 11p

Averaged across 51 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 Austin, TX and Harlingen, TX.

Start on East 5th Street

0.5 mi · 1 min · East 5th Street

Use the straight / right lanes.

At end of road, turn right onto North Interstate 35

0.4 mi · 39 sec · North Interstate 35

Use the straight / slight left lanes.

Take the ramp

0.2 mi · 21 sec

Toward I 35 South

Merge onto I 35; US 290

46 mi · 50 min · Purple Heart Trail

Use the straight / slight right lanes.

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 right at fork onto I 410

11 mi · 12 min · Connally Loop

Toward I 410 South Use the straight / slight right lanes.

Take the exit

0.2 mi · 28 sec

Exit 41 Toward I 37, US 281 North: San Antonio, Corpus Christi Use the straight / slight right lanes.

Keep slight left at fork

0.5 mi · 1 min

Toward I 37 South: Corpus Christi Use the slight left / slight right lanes.

Merge onto I 37

119 mi · 1 hr 59 min · I 37

Use the straight / slight right lanes.

Take the exit onto I 69E; US 77

31 mi · 33 min · I 69E; US 77

Toward I 69E, US 77: Kingsville, Brownsville Use the straight / slight right lanes.

Keep slight left at fork onto US 77

61 mi · 1 hr 9 min · U.S. Highway 77

Keep slight left at fork onto I 69E; US 77

27 mi · 27 min · U.S. Highway 77

Use the straight / slight right lanes.

Take the exit

0.3 mi · 30 sec

Exit 29A Toward US 77 Business, Loop 499: Valley International Airport, Primera Road Use the straight / slight right lanes.

At end of road, turn left onto US 77 Bus

0.4 mi · 44 sec · Business 77

Turn slight right onto US 77 Bus

0.8 mi · 1 min · North 77 Sunshine Strip

Turn slight right onto North Commerce Street

2.1 mi · 3 min · North Commerce Street

Arrive at destination

South Commerce Street

Trip Plan

To make the most of this 5-hour, 49-minute drive, consider an early morning departure from Austin to avoid potential city traffic. With only one recommended stop and a fuel cost around $52, this trip is easily manageable in a single day. Keep an eye on your fuel gauge, especially during the 118.7-mile stretch on I 37, as services can be spread out. The transition from I 37 to U.S. Highway 77 will mark a shift in the driving environment, so be prepared for more frequent exits and local roads.

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 162.3 miles from Austin, TX, or about 2h 52m into the drive.

The longest continuous stretch on this route runs about 118.7 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 71 miles or 1h 18m in

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

Halfway reset

Around 162.3 miles or 2h 52m 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 43m

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

Before You Leave

Open the route before leaving Austin, 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 Austin, TX

This is one driving day of about 324.5 miles and 5h 49m.

Your first comfortable stop window is around 71 miles from Austin, 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 I 37 for about 118.7 miles.

Where to Stop

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

city in and county seat of Live Oak County, Texas, United States

Mid-route town

Meal stop

George West, TX

162 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

Converse, TX

Fuel and coffee

A short stop after about 71 miles helps settle the day before fatigue starts building.

George West, TX

Meal break

The midpoint is around 162.3 miles from Austin, TX, which is a good place for a longer meal and fuel stop.

Before the longest stretch

Fuel check

Top up before I 37 if your tank is already low. That segment runs about 118.7 miles.

0.2 mi from route ~1 min detour

Austin, Texas

Hours: 9 am–10 pm

Visit website

The Sophienburg Museum & Archives

4.6 ★ ★ ★ ★ ★

Near the start, short detour

First break 1.5 mi from route ~4 min detour

New Braunfels, Texas

Hours: 10 am–4 pm

+18306291572

Visit website

4.1 ★ ★ ★ ★ ☆

Near the start, short detour

1.7 mi from route ~4 min detour

Austin, Texas

Hours: 9 am–5 pm

US Army Medical Department Museum

4.7 ★ ★ ★ ★ ★

Early in the drive, ~10 min detour

Early stretch 4 mi from route ~10 min detour

Fort Sam Houston, Texas

+12102216358

Visit website

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

Heads-up: tricky spots

5 of 13

5 decision points cluster between mile 0.5 and 321 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.

0.5 mi into trip | ~1m in | North Interstate 35

At end of road, turn right onto North Interstate 35

Lane positioning matters here

Use the straight / slight left lanes.

71.1 mi into trip | ~1h 18m in | I 410 / Connally Loop

Keep slight right at fork onto I 410 / Connally Loop toward I 410 South

Highway fork - watch signs carefully. Lane positioning matters here

Use the straight / slight right lanes. Toward I 410 South

82 mi into trip | ~1h 31m in

Take the exit toward I 37, US 281 North: San Antonio, Corpus Christi

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 41 Toward I 37, US 281 North: San Antonio, Corpus...

82.2 mi into trip | ~1h 31m in

Keep slight left at fork toward I 37 South: Corpus Christi

Highway fork - watch signs carefully. Lane positioning matters here

Use the slight left / slight right lanes. Toward I 37 South: Corpus Christi

321 mi into trip | ~5h 43m in

Take the exit toward US 77 Business, Loop 499: Valley International Airport, Primera 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 29A Toward US 77 Business, Loop 499: Valley Interna...

Fuel & Cost

Regular Gas

$44.45 one way

$88.89 round trip

$3.48/gal 25.4 MPG avg 114 kg CO₂

Fuel Type	$/gal	One Way	Round Trip
midgrade	$3.89	$49.65	$99.29
premium	$4.23	$53.98	$107.95
diesel	$4.80	$61.27	$122.54

No toll roads detected on this route.

Estimated Trip Cost (one way, 1 person)

Fuel

$44

Meals

$25–$50

Total

$69–$94

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

Estimated CO2 emission: 113.5 kg one way. Prices: EIA weekly data, 2026-07-13.

Driving Electric?

About $34 in charging · 1 stop · 67% less CO₂

Vehicle Type	kWh	Stops	DC Fast	Home Charge
Average EV	97.4	1	$34.07	$15.58
Efficient EV	81.1	0	$28.39	$12.98
EV Truck/SUV	129.8	1	$45.43	$20.77

Gas CO2

114 kg

EV CO2

38 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 as of Jul 17, 2026

Origin

Austin, TX

Late night in Austin on Monday

Local time

12:53 AM

CDT

Current temp

92°F

Partly Sunny

SSE 5 to 10 mph 6% chance Live forecast

Flood Warning

Flood Warning issued July 17 at 10:45AM CDT until July 17 at 1:45PM CDT by NWS San Angelo TX

Flood Warning

Flood Warning issued July 17 at 10:31AM CDT until July 18 at 1:00PM CDT by NWS San Angelo TX

Destination

Harlingen, TX

Late night in Harlingen on Monday

Local time

12:53 AM

CDT

Current temp

97°F

Mostly Sunny

SE 13 to 16 mph 2% chance Live forecast

Flood Warning

Flood Warning issued July 17 at 10:45AM CDT until July 17 at 1:45PM CDT by NWS San Angelo TX

Flood Warning

Flood Warning issued July 17 at 10:31AM CDT until July 18 at 1:00PM CDT by NWS San Angelo TX

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

5 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 49m 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.

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...

5 mi from route ~13 min detour Free near mile 78.3

View on nps.gov

Palo Alto Battlefield National Historical Park

National Historical Park

On May 8, 1846, U.S. and Mexican troops clashed on the prairie of Palo Alto. The battle was the first in a two-year long war that changed the map of North America. Although the two countries have deve...

18 mi from route ~46 min detour Free near mile 324.5

View on nps.gov

Padre Island National Seashore

National Seashore

Protecting sixty-six miles of wild coastline along the Gulf of America, the narrow barrier island is home to one of the last intact coastal prairie habitats in the United States. Along the hypersaline...

27 mi from route ~68 min detour $25 near mile 257.4

View on nps.gov

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

What kind of drive is this?

With 77% of this route on highways, expect a lot of time cruising at higher speeds. The longest continuous stretch on a highway is 118.7 miles on I 37, so plan accordingly for fuel and breaks. You'll transition from the interstate to U.S. Highway 77, which will likely involve more local traffic and potentially a higher density of exits as you get closer to your destination.

77% highway — fuel and pacing are the main things to plan.

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

Longest single stretch: 118.7 mi on I 37.

How Hard Is This Drive?

9/10

This is a straightforward highway drive that stays mostly on I 37 and U.S. Highway 77. This route has several spots where lane changes, forks, or exits need your full attention. The trickiest moment comes around 0.5 miles in near North Interstate 35.

Driving Effort 9/10

High effort - long or complex enough to need steady focus all day

Balances navigation complexity with total wheel time.

This is a demanding drive. With 13 significant decision points across 324.5 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 0.5 miles (North Interstate 35): Lane positioning matters here; at 71.1 miles (I 410 / Connally Loop): Highway fork - watch signs carefully. Lane positioning matters here; at 82 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one.

Elevation Profile

Mostly flat terrain

739 ft 27 ft

Total Climb

343 ft

Total Descent

790 ft

Highest Point

739 ft

~69.5 mi in

Elevation Range

712 ft

Towns Mentioned on Route Signs

Based on OSRM destination-sign hints, not a full list of every settlement the road passes.

0.1 mi from route

Cuisine: coffee_shop

Hours: Mo-Fr 05:30-21:00, Sa,Su 06:30-19:00

Starbucks

Cafe

Near the start, right off the route

0.7 mi from route ~2 min detour

Austin, TX

Cuisine: coffee_shop

Hours: Mo-Su 05:00-19:00

Visit website

Colletti's Italian Restaurant

Restaurant

Near the end, right off the route

Home stretch 0.1 mi from route

Harlingen, TX

Cuisine: italian

Visit website

Restaurant

Near the start, right off the route

0.1 mi from route

Visit website

Old Pecan Street Cafe

Restaurant

Near the start, right off the route

0.2 mi from route

Visit website

South Congress Bat Colony

Attraction

Near the start, right off the route

0.6 mi from route ~1 min detour

Doug Sahm Hill

Viewpoint

Near the start, right off the route

0.7 mi from route ~2 min detour

Santa Rita No. 1 Oil Well

Attraction

Near the start, short detour

1 mi from route ~3 min detour

Lou Neff Point

Viewpoint

Near the start, short detour

1.1 mi from route ~3 min detour

Pease District Park

Park

Near the start, short detour

1.3 mi from route ~3 min detour

Bee Caves Preserve

Park

Near the start, short detour

3.3 mi from route ~8 min detour

Loma Sandia Prehistoric Cemetery

Memorial

Around the midpoint, right off the route

Halfway reset 0 mi from route

Twinkle Twinkle Lone Star Guitar

Monument

Near the start, right off the route

0.1 mi from route

Harlingen

Memorial

Near the end, right off the route

Home stretch 0.1 mi from route

Golden Age of Hollywood & Mexican Cinema in Harlingen, Texas

Artwork

Near the end, right off the route

Home stretch 0.1 mi from route

The History of Mexico & Mankind

Artwork

Near the end, right off the route

Home stretch 0.2 mi from route

First United Methodist Church of Harlingen

Memorial

Near the end, right off the route

Home stretch 0.2 mi from route ~1 min detour

Omni Hotel & Resorts

Hotel

Near the start, right off the route

0.4 mi from route ~1 min detour

Qubed

Hotel

Early in the drive, short detour

Early stretch 1.3 mi from route ~3 min detour

San Antonio, TX

Hours: 24/7

Visit website

Fairfield Inn & Suites

Hotel

Near the end, short detour

Home stretch 2 mi from route ~5 min detour

Harlingen, TX

Visit website

Days Inn

Hotel

Early in the drive, short detour

Early stretch 2.1 mi from route ~5 min detour

San Antonio, TX

Visit website

Super 8

Motel

Early in the drive, short detour

Early stretch 2.7 mi from route ~7 min detour

San Antonio, TX

Visit website

Fireside Inn San Antonio / Ft. Sam Houston

Motel

Early in the drive, short detour

Early stretch 2.9 mi from route ~7 min detour

Points of interest from OpenStreetMap contributors. Listings may not reflect current hours or availability.

About the Cities

Starting in Austin, TX

Full guide →

“City of the Violet Crown” · Founded 1835

Austin is a city of about 1,054,000 (2026) surpassing Fort Worth to become the 4th most populous city in Texas. It is on the southeast edge of the Hill Country region of Texas, making it the fourth-largest city in the state and the 11th-largest in the country. It is the capital of Texas and a college town, and also a center of an alternative culture away from the major cities on the US coasts, though the city is rapidly gentrifying with its rising popularity. Austin's attitude is commonly emblazoned about town on T-shirts and bumper stickers that read: "Keep Austin Weird." Austin is also marketed as the Live Music Capital of the World due to the large number of venues.

Top landmarks

• Texas State Capitol — capitol and seat of government of the U.S. state of Texas
• Lyndon Baines Johnson Library and Museum — presidential library and museum for U.S. President Lyndon B. Johnson in Austin,...
• Texas State Cemetery — historic cemetery in Austin, Texas, USA

Arriving in Harlingen, TX

Full guide →

Founded 1904

Harlingen is a city in 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 49m. Total distance: 324.5 miles.

Family Friendly

Moderate complexity with 1 natural rest stops along the way.

Solo Traveler

5h 49m drive, comfortable solo distance.

First-Time Driver

Mostly highway driving (77%). Some complex stretches to watch for.

Frequently Asked Questions

The longest stretch is about 118.7 miles on I 37. The full list of main roads is in the Roads section above.

Yes — we found about 29 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 Harlingen, 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 29 rest areas along the route for bathroom stops.

Yes — San Antonio Missions National Historical Park, Palo Alto Battlefield National Historical Park and Padre Island National Seashore. See the National Parks section for detour distances and tips on detours.

Not recommended in a single day. At 5.8 hours each way, a round trip means 11.7 hours of driving — that is an unsafe level of fatigue for most drivers. Plan at least one night at Harlingen, 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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