Princeton, TX to Killeen, TX is 196.1 miles and takes about 3h 32m via South R L Thornton Freeway, with a fuel budget near $30 and enough daylight to finish in a day. This single-day trip stays within Texas, traversing the Great Plains region for its entirety. Expect a highway-focused drive with a significant portion on main roads like South R L Thornton Freeway, Purple Heart Trail, and Central Expressway. Given its straightforward nature and manageable duration, this route is a practical choice for a direct journey between these two Texas locations.
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
98.1 miles from Princeton, TX
A natural place for your longest stop of the day
, about 1h 47m into the drive
.
Main Roads
Road
Distance
Duration
South R L Thornton Freeway
89.9 mi
1h 32m
Purple Heart Trail
37.9 mi
39m
Central Expressway
30.9 mi
33m
Central Texas Expressway
13.1 mi
13m
North Jack Kultgen Expressway
6.6 mi
7m
East University Drive
4.3 mi
5m
East Princeton Drive
3 mi
3m
West Central Texas Expressway
2.9 mi
3m
Longest stretch:
South R L Thornton Freeway
— 89.9 mi, about 1h 32m
Turn-by-Turn Driving Directions
Step-by-step road directions between Princeton, TX and Killeen, TX.
1
Start on FM 75
311 ft·17 sec·North Front Street
2
Turn right onto FM 75
0.4 mi·50 sec·North 4th Street
3
Turn right onto US 380
3.0 mi·3 min·East Princeton Drive
Use the straight / right lanes.
4
Continue on US 380
4.3 mi·5 min·East University Drive
5
Continue on US 380
1.5 mi·2 min·West University Drive
Use the straight lane.
6
Turn left onto North Central Expressway
485 ft·8 sec·North Central Expressway
7
Take the ramp
0.3 mi·39 sec
Toward US 75 South, TX 121 South
8
Merge onto US 75; TX 121
31 mi·33 min·Central Expressway
Use the straight / slight right lanes.
9
Take the exit
501 ft·12 sec
Exit 284CToward Downtown, Good-Latimer ExpresswayUse the slight left lane.
10
Continue on North Central Expressway
0.7 mi·1 min·North Central Expressway
Use the left / straight lanes.
11
Turn right onto Elm Street
304 ft·10 sec·Elm Street
12
Turn left onto North Pearl Expressway
0.2 mi·28 sec·North Pearl Expressway
Use the straight lane.
13
Turn right onto Young Street
0.1 mi·19 sec·Young Street
14
Turn left onto South Harwood Street
315 ft·8 sec·South Harwood Street
Use the left lane.
15
Turn right onto Canton Street
0.4 mi·47 sec·Canton Street
16
Take the ramp
0.3 mi·38 sec
Toward I 30 West
17
Keep slight left at fork
0.1 mi·14 sec
Toward I 35E South, I 35E North: Waco, Denton
18
Keep slight left at fork
221 ft·5 sec
Toward I 35E North, I 35E South: Denton, WacoUse the straight / slight right lanes.
19
Keep slight left at fork
0.4 mi·30 sec
Toward I 35E South: WacoUse the left / right lanes.
20
Continue on I 35E
0.5 mi·44 sec·South R L Thornton Freeway
21
Continue on I 35E
89 mi·1 hr 31 min·South R L Thornton Freeway
Exit 426Toward Dallas ZooUse the straight / slight right lanes.
22
Continue on I 35; US 77
6.6 mi·7 min·North Jack Kultgen Expressway
Use the straight / slight right lanes.
23
Continue on I 35
38 mi·39 min·Purple Heart Trail
Use the straight / slight right lanes.
24
Keep slight right at fork onto I 14; US 190
13 mi·13 min·Central Texas Expressway
Toward US 190 West: Killeen, Fort CavazosUse the straight / slight right lanes.
25
Take the exit
0.3 mi·32 sec
Exit 287Toward FM 3470: Rosewood Drive, Stan Schlueter LoopUse the slight right lane.
26
Turn straight onto West Central Texas Expressway
2.9 mi·3 min·West Central Texas Expressway
27
Turn right onto South W.S. Young Drive
1.3 mi·2 min·South W.S. Young Drive
28
Turn left onto US 190 Bus
1.0 mi·1 min·East Veterans Memorial Boulevard
29
Turn right
83 ft·8 sec
30
Turn right
74 ft·5 sec
31
Arrive at destination
Trip Plan
This 196.1-mile drive can easily be completed in a single day, so you have flexibility with your departure time. Leaving Princeton, TX in the morning will allow you to arrive in Killeen, TX with plenty of daylight remaining. With a duration of just over 3.5 hours, you'll likely only need one planned stop for fuel or a quick break. Keep an eye on your fuel gauge, especially before the longest stretch of 89.9 miles on South R L Thornton Freeway, to ensure you have ample gas for that segment.
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 98.1 miles from Princeton, TX, or about 1h 47m into the drive.
The longest continuous stretch on this route runs about 89.9 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 43 miles or 50m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 98.1 miles or 1h 47m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Final approach
Final hour starts around 2h 52m
Traffic, exits, and arrival timing usually matter more near Killeen, TX than in the middle of the route.
Before You Leave
+
Open the route before leaving Princeton, 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 Princeton, TX
This is one driving day of about 196.1 miles and 3h 32m.
Your first comfortable stop window is around 43 miles from Princeton, 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 89.9 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 22
5 decision points cluster between mile 40.6 and 190.6 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
8
40.6 mi into trip|~46m in
Take the exit toward Downtown, Good-Latimer Expressway
Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one
Use the slight left lane.
Exit 284C
Toward Downtown, Good-Latimer Expressway
9
42.7 mi into trip|~50m in
Keep slight left at fork toward I 35E North, I 35E South: Denton, Waco
Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one
Use the straight / slight right lanes.
Toward I 35E North, I 35E South: Denton, Waco
7
42.8 mi into trip|~50m in
Keep slight left at fork toward I 35E South: Waco
Highway fork - watch signs carefully. Lane positioning matters here
Use the left / right lanes.
Toward I 35E South: Waco
8
177.5 mi into trip|~3h 10m in|I 14; US 190 / Central Texas Expressway
Keep slight right at fork onto I 14; US 190 / Central Texas Expressway toward US 190 West: Killeen, Fort Cavazos
Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one
Use the straight / slight right lanes.
Toward US 190 West: Killeen, Fort Cavazos
8
190.6 mi into trip|~3h 23m in
Take the exit toward FM 3470: Rosewood Drive, Stan Schlueter Loop
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 287
Toward FM 3470: Rosewood Drive, Stan Schlueter...
Fuel & Cost
Regular Gas
$29.63 one way
$59.26 round trip
$3.84/gal25.4 MPG avg69 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.20
$32.43
$64.87
premium
$4.54
$35.01
$70.02
diesel
$5.61
$43.30
$86.59
Estimated Tolls: $2.55
Central Expressway
(31.8 mi)$2.55
Toll estimates based on average 2024-2025 rates. EZ-Pass/SunPass discounts may lower the actual cost.
Estimated Trip Cost (one way, 1 person)
Fuel
$30
Tolls
$3
Meals
$25–$50
Total
$57–$82
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 68.6 kg one way.
Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $21 in charging
· 0 stops
· 67% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
58.8
0
$20.59
$9.41
Efficient EV
49
0
$17.16
$7.84
EV Truck/SUV
78.4
0
$27.45
$12.55
Gas CO2
69 kg
EV CO2
23 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 Apr 15, 2026
Origin
Princeton, TX
Morning
in Princeton on Sunday
Local time
9:36 AM
CDT
Current temp
74°F
Unavailable
Live forecast
Destination
Killeen, TX
Morning
in Killeen on Sunday
Local time
9:36 AM
CDT
Current temp
60°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
14 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
3h 32m 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.
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
~12 min detour
Free
near mile 135.2
Park data from the National Park Service API. Alerts update every 2 hours.
More Details
What kind of drive is this?
This route is primarily a highway-focused drive, with 74% of it utilizing major roadways. You'll experience a significant stretch of 89.9 miles on South R L Thornton Freeway, indicating long, uninterrupted segments on well-traveled roads. The journey's character remains consistent, leaning towards efficient travel rather than winding scenic byways. Expect a driving experience that prioritizes covering distance smoothly on established highways.
74% 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: 89.9 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 Purple Heart Trail. This route has several spots where lane changes, forks, or exits need your full attention. The trickiest moment comes around 40.6 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 22 significant decision points across 196.1 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 40.6 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one; at 42.7 miles: Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one; at 42.8 miles: Highway fork - watch signs carefully. Lane positioning matters here.
Elevation Profile
Mostly flat terrain
823 ft444 ft
Total Climb
697 ft
Total Descent
449 ft
Highest Point
823 ft
~196.1 mi in
Elevation Range
379 ft
Towns Mentioned on Route Signs
Based on OSRM destination-sign hints, not a full list of every settlement the road passes.
Between Princeton, TX and Killeen, TX, road signs point toward Downtown, Denton, Waco, Dallas Zoo and Fort Cavazos.
Killeen is a city in the Central Hill Country of Texas. It is home to U.S. Army installation Fort Cavasos, one of the largest military bases in the world.
Doable as a same-day drive at 3h 32m. Total distance: 196.1 miles.
Family Friendly
Moderate complexity with 1 natural rest stops along the way.
Solo Traveler
3h 32m drive, comfortable solo distance.
First-Time Driver
Mostly highway driving (74%). Some complex stretches to watch for.
Frequently Asked Questions
The longest stretch is about 89.9 miles on South R L Thornton Freeway. The full list of main roads is in the Roads section above.
Expect about $2.55 in tolls one way, starting with Central Expressway. Most Northeast and Midwest toll agencies accept E-ZPass; in the West and Texas, transponders like TxTag or FasTrak apply. If you do not have a transponder, cashless tolling plates will mail a bill to the vehicle's registered address — usually with a surcharge, so a rental-car toll pass is often cheaper than paying by mail.
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 Killeen, 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 40.6 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one; at 42.7 miles: Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one; at 42.8 miles: Highway fork - watch signs carefully. Lane positioning matters here.
Yes — Waco Mammoth National Monument. See the National Parks section for detour distances and tips on detours.
Possible but tiring. At 3.5 hours each way, an in-and-out day trip would put you behind the wheel for 7.1 hours — manageable with a long break at Killeen, TX, but most travelers stay overnight.
