Sunnyvale, TX to Austin, TX is 208.4 miles and takes about 3h 43m via I 35, with a fuel budget near $30 and enough daylight to finish in a day. This drive stays within Texas and the Great Plains region, making for a straightforward trip. With a high percentage of highway driving, expect a relatively efficient transit between these two points. It's a common route for those heading south, and most drivers can complete it comfortably in a single day.
Trip Pace
Same-day drive is realistic
A same-day return is realistic if you keep stops short.
Break Rhythm
1 planned break
A short stop every 2 to 3 hours is enough for this drive.
Midpoint
104.2 miles from Sunnyvale, TX
A natural place for your longest stop of the day
, about 1h 52m into the drive
.
Main Roads
Road
Distance
Duration
South R L Thornton Freeway
80.3 mi
1h 22m
I 35
55.8 mi
58m
Purple Heart Trail
40.3 mi
42m
Lyndon B Johnson Freeway
18.2 mi
19m
North Jack Kultgen Expressway
6.6 mi
7m
US 80
2.7 mi
2m
North Collins Road
0.8 mi
1m
East 6th Street
0.5 mi
1m
Longest stretch:
South R L Thornton Freeway
— 80.3 mi, about 1h 22m
Traffic on I-35
Hour-of-day weekday pattern from 68 FHWA count stations on your route.
Peak
5 PM
~3,781 veh/hr typical
· worst 4,412
Quietest
2 AM
~650 veh/hr
Peak-to-quiet ratio
5.8×
busier at peak than in the quiet hours
12a6anoon6p11p
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 Sunnyvale, TX and Austin, TX.
1
Start on this road
527 ft·43 sec·this road
2
Turn left onto Raider Drive
457 ft·21 sec·Raider Drive
3
Turn left onto North Collins Road
0.2 mi·24 sec·North Collins Road
4
Enter roundabout onto North Collins Road
137 ft·3 sec·North Collins Road
5
Continue on North Collins Road
0.6 mi·1 min·North Collins Road
6
Turn slight right
217 ft·9 sec
7
Turn straight onto East US Highway 80
0.3 mi·33 sec·East US Highway 80
8
Take the ramp
0.3 mi·34 sec
Toward US 80 West
9
Merge onto US 80
2.7 mi·2 min·US 80
Use the straight / slight right lanes.
10
Take the exit
0.9 mi·1 min
Toward I 635 SouthUse the slight right lane.
11
Merge onto I 635
18 mi·19 min·Lyndon B Johnson Freeway
Use the straight / slight right lanes.
12
Take the exit
1.0 mi·2 min
Exit 467BToward I 35E South: WacoUse the straight / slight right lanes.
13
Merge onto I 35E
80 mi·1 hr 22 min·South R L Thornton Freeway
Use the straight / slight right lanes.
14
Continue on I 35; US 77
6.6 mi·7 min·North Jack Kultgen Expressway
Use the straight / slight right lanes.
15
Continue on I 35
38 mi·39 min·Purple Heart Trail
Use the straight / slight right lanes.
16
Keep slight left at fork onto I 35
56 mi·58 min·I 35
Use the straight / slight right lanes.
17
Keep slight left at fork onto I 35; US 290
2.4 mi·3 min·Purple Heart Trail
Toward 32nd Street, Dean Keeton StreetUse the slight left lane.
18
Take the exit
0.2 mi·26 sec
Exit 234BToward 8th–3rd Streets, Huston-Tillotson UniversityUse the slight right lane.
19
Turn straight onto North Interstate 35
0.2 mi·27 sec·North Interstate 35
Use the straight / right lanes.
20
Turn right onto East 6th Street
0.5 mi·1 min·East 6th Street
Use the right lane.
21
Turn left onto Congress Avenue
357 ft·17 sec·Congress Avenue
22
Turn left onto East 5th Street
28 ft·0 sec·East 5th Street
Use the left lane.
23
Arrive at destination
East 5th Street
Trip Plan
For this 208.4-mile drive, leaving in the morning will give you plenty of daylight to reach Austin. Since the total travel time is under 4 hours, you can easily complete this in one day without needing an overnight stop. While there's only one recommended stop, you might consider a brief pause around the halfway point for fuel or a quick break. Keep an eye on your fuel levels, especially during the 80.3-mile stretch on South R L Thornton Freeway, and plan your fueling before that segment if needed.
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 104.2 miles from Sunnyvale, TX, or about 1h 52m into the drive.
The longest continuous stretch on this route runs about 80.3 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 46 miles or 52m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 104.2 miles or 1h 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 3h 1m
Traffic, exits, and arrival timing usually matter more near Austin, TX than in the middle of the route.
Before You Leave
+
Open the route before leaving Sunnyvale, 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 Sunnyvale, TX
This is one driving day of about 208.4 miles and 3h 43m.
Your first comfortable stop window is around 46 miles from Sunnyvale, 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 South R L Thornton Freeway for about 80.3 miles.
Where to Stop
Rest stops, refuel points, and overnight suggestions along this route.
Place data sourced from public business listings. Hours and availability may vary.
Heads-up: tricky spots
5 of 16
5 decision points cluster between mile 4.3 and 208.4 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
6
4.3 mi into trip|~7m in
Take the exit toward I 635 South
Exit ramp - move to the correct lane early. Lane positioning matters here
Use the slight right lane.
Toward I 635 South
7
23.4 mi into trip|~28m in
Take the exit toward I 35E South: Waco
Exit ramp - move to the correct lane early. Lane positioning matters here
Use the straight / slight right lanes.
Exit 467B
Toward I 35E South: Waco
8
205 mi into trip|~3h 37m 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
8
207.4 mi into trip|~3h 40m in
Take the exit toward 8th–3rd Streets, Huston-Tillotson University
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 234B
Toward 8th–3rd Streets, Huston-Tillotson Univer...
7
208.4 mi into trip|~3h 43m in|East 5th Street
Turn left onto East 5th Street
Lane positioning matters here
Use the left lane.
Fuel & Cost
Regular Gas
$28.54 one way
$57.09 round trip
$3.48/gal25.4 MPG avg73 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$3.89
$31.88
$63.77
premium
$4.23
$34.66
$69.33
diesel
$4.80
$39.35
$78.70
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$29
Meals
$25–$50
Total
$54–$79
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 72.9 kg one way.
Prices: EIA weekly data, 2026-07-13.
Driving Electric?
About $22 in charging
· 0 stops
· 67% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
62.5
0
$21.88
$10.00
Efficient EV
52.1
0
$18.24
$8.34
EV Truck/SUV
83.4
1
$29.18
$13.34
Gas CO2
73 kg
EV CO2
24 kg (67% 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.
Forecast as of Jul 19, 2026
Origin
Sunnyvale, TX
Morning
in Sunnyvale on Monday
Local time
6:21 AM
CDT
Current temp
75°F
Mostly Clear
S 5 to 10 mph1% chanceLive forecast
Flash Flood Warning
Flash Flood Warning issued July 18 at 7:40PM CDT until July 18 at 10:45PM CDT by NWS Midland/Odessa TX
Special Weather Statement
Special Weather Statement issued July 18 at 7:36PM CDT by NWS Lubbock TX
Destination
Austin, TX
Morning
in Austin on Monday
Local time
6:21 AM
CDT
Current temp
76°F
Mostly Cloudy
S 5 to 10 mph1% chanceLive forecast
Flash Flood Warning
Flash Flood Warning issued July 18 at 7:40PM CDT until July 18 at 10:45PM CDT by NWS Midland/Odessa TX
Special Weather Statement
Special Weather Statement issued July 18 at 7:36PM CDT by NWS Lubbock 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
1 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
3h 43m on the road
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.
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
~13 min detour
Free
near mile 107.8
Park data from the National Park Service API. Alerts update every 2 hours.
More Details
What kind of drive is this?
This route is predominantly highway, with 79% of the drive on major roads like I 35. You'll experience a longest stretch of 80.3 miles on South R L Thornton Freeway before transitioning to other main roads. Expect a significant amount of highway cruising, with the highway portion likely ending sometime before you reach Austin, potentially opening up to more varied road conditions as you approach the city.
79% highway — fuel and pacing are the main things to plan.
23 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 80.3 mi on South R L Thornton Freeway.
How Hard Is This Drive?
8/10
This is a straightforward highway drive that stays mostly on South R L Thornton Freeway and I 35. This route has several spots where lane changes, forks, or exits need your full attention. The trickiest moment comes around 4.3 miles in.
Driving Effort8/10
Demanding - plan breaks and stay ahead of the key maneuvers
Balances navigation complexity with total wheel time.
This is a demanding drive. With 16 significant decision points across 208.4 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 4.3 miles: Exit ramp - move to the correct lane early. Lane positioning matters here; at 23.4 miles: Exit ramp - move to the correct lane early. Lane positioning matters here; at 205 miles (I 35; US 290 / Purple Heart Trail): Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one.
Sunnyvale is a city in the South Bay region of the San Francisco Bay Area, in California. Sunnyvale was ranked the 5th safest city in the United States in its size category for 2004.
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
Doable as a same-day drive at 3h 43m. Total distance: 208.4 miles.
Family Friendly
Moderate complexity with 1 natural rest stops along the way.
Solo Traveler
3h 43m drive, comfortable solo distance.
First-Time Driver
Mostly highway driving (79%). Some complex stretches to watch for.
Frequently Asked Questions
The longest stretch is about 80.3 miles on South R L Thornton Freeway. The full list of main roads is in the Roads section above.
We did not find dedicated rest areas on this route. For a drive this long, plan bathroom and stretch breaks around gas stations, fast-food stops, or small-town downtowns — check the Nearby Places section for options.
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 Austin, 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. Dedicated rest areas are limited, so plan gas or food stops as your bathroom breaks.
The main spots that need attention: at 4.3 miles: Exit ramp - move to the correct lane early. Lane positioning matters here; at 23.4 miles: Exit ramp - move to the correct lane early. Lane positioning matters here; at 205 miles (I 35; US 290 / Purple Heart Trail): Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one.
Yes — Waco Mammoth National Monument. See the National Parks section for detour distances and tips on detours.
Possible but tiring. At 3.7 hours each way, an in-and-out day trip would put you behind the wheel for 7.4 hours — manageable with a long break at Austin, TX, but most travelers stay overnight.
