Port Isabel, TX to Amarillo, TX is 795.9 miles and takes about 14h 20m via US 281, Marshall Formby Memorial Highway, and U.S. Highway 77, with a fuel budget near $116 and enough daylight to finish in a day if you start early. This is a long-haul drive that spans across Texas, moving from the southern coastal region towards the Panhandle. You'll be covering a significant portion of the state, so be prepared for a full day or plan to split it over two days. The primary roads offer a mix of highway and surface roads, making it a practical choice for those looking to see more of the Texas landscape.
Trip Pace
Best split across 2 days
Treat the return leg as its own travel day rather than an afterthought.
Break Rhythm
4 planned breaks
Plan on a short reset every 3 to 4 hours to stay fresh behind the wheel.
Midpoint
398 miles from Port Isabel, TX
A natural place for your longest stop of the day
, about 7h 19m into the drive
.
Main Roads
Road
Distance
Duration
US 281
122.7 mi
2h 12m
Marshall Formby Memorial Highway
109.9 mi
1h 51m
U.S. Highway 77
102 mi
1h 53m
I 10
98.7 mi
1h 37m
US 84
74.5 mi
1h 14m
Frisco Avenue
41.9 mi
44m
State Highway 153
29.5 mi
33m
North Main Street
29.3 mi
30m
Longest stretch:
US 281
— 122.7 mi, about 2h 12m
Traffic on I-27
Hour-of-day weekday pattern from 18 FHWA count stations on your route.
Peak
5 PM
~615 veh/hr typical
· worst 753
Quietest
2 AM
~47 veh/hr
Peak-to-quiet ratio
13.1×
busier at peak than in the quiet hours
12a6anoon6p11p
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 Port Isabel, TX and Amarillo, TX.
1
Start on South Musina Street
0.2 mi·33 sec·South Musina Street
2
Turn left onto TX 100
0.1 mi·23 sec·West Queen Isabella Boulevard
3
Turn straight onto TX 100
1.0 mi·2 min·State Highway 100
Use the left lane.
4
Turn left onto TX 48
14 mi·15 min·TX 48
Use the left lane.
5
Take the exit
0.2 mi·22 sec
Toward TX 550Use the straight / slight right lanes.
6
Keep slight right at fork
47 ft·1 sec
Toward TX 550Use the straight / left / right lanes.
7
Turn right onto TX 550 Toll
3.6 mi·3 min·State Highway 550
8
Continue on FM 511
1.9 mi·2 min·FM 511
9
Continue on I 169; TX 550 Toll
0.9 mi·58 sec·I-169, TX 550 Toll
10
Continue on I 169; TX 550 Toll
3.6 mi·3 min·Interstate 169
11
Merge onto I 69E; US 77; US 83
2.2 mi·2 min·North Expressway
12
Continue on I 69E; US 77; US 83
102 mi·1 hr 53 min·U.S. Highway 77
Use the straight / slight right lanes.
13
Keep slight right at fork
0.1 mi·8 sec
14
Keep slight right at fork
0.7 mi·1 min
15
Turn left onto FM 772
0.2 mi·17 sec·FM 772
16
Turn straight onto US 77 Business
4.4 mi·7 min·South 6th Street
17
Turn left onto TX 141
14 mi·17 min·West King Avenue
18
Take the ramp
0.6 mi·1 min
19
Merge onto US 281
54 mi·1 hr 1 min·US 281
20
Keep slight left at fork onto US 281
15 mi·18 min·Nueces Street
21
Continue on US 281
0.2 mi·15 sec·US 281
22
Take the exit onto US 281
68 mi·1 hr 10 min·US 281
Use the straight / slight right lanes.
23
Take the exit
0.2 mi·27 sec
Exit 140BToward Cesar Estrada Chavez Boulevard, AlamodomeUse the slight right lane.
24
Turn left onto East César E. Chávez Boulevard
1.4 mi·3 min·East César E. Chávez Boulevard
Use the left / straight lanes.
25
Take the ramp
0.2 mi·31 sec
Toward I 10 West, I 35 North
26
Merge onto I 10; I 35; US 87
93 ft·1 sec·South Pan Am Expressway
27
Take the exit onto I 10; US 87
0.9 mi·1 min·McDermott Freeway
Exit 156Toward I 10 West, US 87 North: El PasoUse the straight / slight right lanes.
28
Keep slight left at fork onto I 10; US 87
15 mi·17 min·McDermott Freeway
Use the straight / slight right lanes.
29
Keep slight right at fork onto I 10; US 87
99 mi·1 hr 37 min·I 10; US 87
Use the straight / slight left lanes.
30
Take the exit onto US 83
0.3 mi·44 sec·US 83
Exit 456Toward US 83 North, US 377: Junction, Menard
31
Turn right onto US 83; US 377
29 mi·30 min·North Main Street
Use the right lane.
32
Continue on US 83
42 mi·44 min·Frisco Avenue
33
Continue on US 83
17 mi·18 min·Roberts Avenue
34
Turn right onto US 67; US 83
387 ft·18 sec·Hutchings Avenue
Use the right lane.
35
Turn left onto TX 158
6.3 mi·7 min·North Broadway Street
Use the left lane.
36
Turn right onto FM 2111
12 mi·13 min·FM 2111
37
Turn left onto TX 153
29 mi·33 min·State Highway 153
38
Keep slight right at fork onto TX 153
19 ft·0 sec·State Highway 153
39
Turn right onto TX 70
10 mi·10 min·State Highway 70
40
Continue on TX 70
0.8 mi·1 min·Lamar Street
41
Turn left onto Northwest Georgia Avenue
0.1 mi·16 sec·Northwest Georgia Avenue
42
Take the ramp
340 ft·8 sec
Toward I 20 West: Midland
43
Merge onto I 20; US 84
6.0 mi·5 min·I 20; US 84
44
Take the exit onto US 84
0.3 mi·19 sec·US 84
Exit 238AToward US 84 West: Snyder, Lubbock
45
Keep slight left at fork onto US 84
74 mi·1 hr 14 min·US 84
46
Turn right onto Loop 46
1.0 mi·1 min·South Avenue F
47
Keep slight left at fork onto TX 207
0.1 mi·10 sec·North Avenue F
48
Turn straight onto TX 207
0.4 mi·38 sec·Ralls Road
49
Turn left onto Spur 575
0.1 mi·17 sec·East 15th Street
50
Turn right onto US 84
1.0 mi·1 min·North US Highway 84
51
Continue on US 84
20 mi·19 min·Highway 84
52
Continue on US 84
4.6 mi·4 min·Trooper Jerry Don Davis Memorial Highway
53
Continue on US 84
6.8 mi·6 min·East Highway 84
54
Continue on US 84
4.5 mi·5 min·Slaton Road
55
Take the exit
0.2 mi·26 sec
56
Turn slight right onto Interstate 27
321 ft·6 sec·Interstate 27
57
Take the ramp
0.2 mi·31 sec
58
Merge onto I 27; US 87
110 mi·1 hr 51 min·Marshall Formby Memorial Highway
59
Continue on I 27; US 60; US 87
13 mi·15 min·Canyon Expressway
Use the straight / right lanes.
60
Keep slight left at fork onto US 87
0.9 mi·2 min·US 87
Toward US 87 NorthUse the slight left / slight right lanes.
61
Keep slight right at fork onto US 87; Original US Route 66
0.7 mi·1 min·South Fillmore Street
Use the straight / right lanes.
62
Turn right onto I 40 Business; Original US Route 66; US 60
105 ft·1 sec·East Amarillo Boulevard
63
Arrive at destination
I 40 Business; Original US Route 66; US 60
Trip Plan
Given this is a 14-hour drive, splitting it over two days is highly recommended for a more comfortable pace. Aim to leave Port Isabel early in the morning to maximize daylight. You'll have about 4 planned stops, so use these strategically for fuel and rest breaks. Keep an eye on your fuel levels, especially when you're on the longer stretches of US 281. A good place to consider stopping for the night would be around the halfway point, which would put you in central Texas.
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.
This drive is better paced as a 2-day trip.
Plan roughly 4 meaningful breaks for fuel, food, and rest.
The halfway point lands around 398 miles from Port Isabel, TX, or about 7h 19m into the drive.
The longest continuous stretch on this route runs about 122.7 miles.
Consider an overnight stop or starting very early.
Departure
Before you leave
Start with fuel, water, and navigation already sorted so the first hour feels easy.
First stop
Around 175 miles or 3h 22m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 398 miles or 7h 19m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Overnight split
Day 1 wrap after about 398 miles or 7h 19m
Stop before fatigue turns the last few hours into a grind. You want day two to start fresh, not just resumed.
Final approach
Final hour starts around 13h 15m
Traffic, exits, and arrival timing usually matter more near Amarillo, TX than in the middle of the route.
Before You Leave
+
Open the route before leaving Port Isabel, 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.
+
Pick one backup stop option before the midpoint in case traffic changes your pacing.
+
Treat this as a 2-day road trip and book the overnight stop before the busiest arrival window.
Day 1
Settle into the route from Port Isabel, TX
Aim for roughly 398 miles and 7.2 hours of wheel time on this day.
Day 2
Finish the approach into Amarillo, TX
Aim for roughly 398 miles and 7.2 hours of wheel time on this day.
Your first comfortable stop window is around 175 miles from Port Isabel, TX.
This route usually feels better as a 2-day drive than as one long push.
Plan about 4 real breaks rather than only quick fuel stops.
The longest stretch is on US 281 for about 122.7 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 45
5 decision points cluster between mile 15.5 and 794.3 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
6
15.5 mi into trip|~18m in
Take the exit toward TX 550
Exit ramp - move to the correct lane early. Lane positioning matters here
Use the straight / slight right lanes.
Toward TX 550
8
15.6 mi into trip|~19m in
Keep slight right at fork toward TX 550
Highway fork - watch signs carefully. Lane positioning matters here
Use the straight / left / right lanes.
Toward TX 550
8
287.8 mi into trip|~5h 26m in
Take the exit toward Cesar Estrada Chavez Boulevard, Alamodome
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 140B
Toward Cesar Estrada Chavez Boulevard, Alamodom...
8
289.7 mi into trip|~5h 30m in|I 10; US 87 / McDermott Freeway
Take the exit onto I 10; US 87 / McDermott Freeway toward I 10 West, US 87 North: El Paso
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 156
Toward I 10 West, US 87 North: El Paso
7
794.3 mi into trip|~14h 16m in|US 87
Keep slight left at fork onto US 87 toward US 87 North
Highway fork - watch signs carefully. Lane positioning matters here
Use the slight left / slight right lanes.
Toward US 87 North
Fuel & Cost
Regular Gas
$120.83 one way
$241.65 round trip
$3.86/gal25.4 MPG avg279 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.25
$133.17
$266.34
premium
$4.58
$143.51
$287.03
diesel
$5.35
$167.64
$335.28
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$121
Hotel (1n)
$80–$140
Meals
$50–$100
Total
$251–$361
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 278.5 kg one way.
Prices: EIA weekly data, 2026-06-01.
Driving Electric?
About $84 in charging
· 2 stops
· 67% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
238.8
2
$83.57
$38.20
Efficient EV
199
2
$69.64
$31.84
EV Truck/SUV
318.4
3
$111.43
$50.94
Gas CO2
278 kg
EV CO2
93 kg (67% less)
Plan for 2 charging stops, roughly every 270 miles. Allow 25-40 minutes per stop at a DC fast charger.
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 Jun 1, 2026
Origin
Port Isabel, TX
Afternoon
in Port Isabel on Wednesday
Local time
1:58 PM
CDT
Current temp
81°F
Mostly Cloudy
SSE 8 mph4% chanceLive forecast
Destination
Amarillo, TX
Afternoon
in Amarillo on Wednesday
Local time
1:58 PM
CDT
Current temp
65°F
Clear
SSW 10 mph0% chanceLive 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.
For long drives, weather on day two can matter just as much as conditions at departure, so check the whole travel window rather than only the first day.
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
14h 20m on the road
This is long enough that the arrival forecast matters almost as much as departure conditions. Recheck both ends before you roll.
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 274.5
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...
6 mi from route
~15 min detour
Free
near mile 27.4
13,000 years ago, Alibates Flint was used by mammoth hunters as a source of flint for tools. Learn how important this site was to the survival, commerce, and culture of the people of the High Plains.
26 mi from route
~66 min detour
Free
near mile 795.9
Lyndon B. Johnson National Historical Park tells the story of our 36th president beginning with his ancestors until his final resting place on his beloved LBJ Ranch. This entire "circle of life" gives...
28 mi from route
~69 min detour
Free
near mile 329.3
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...
28 mi from route
~69 min detour
$25
near mile 109.8
Set within the wide‑open Texas Plains, Lake Meredith National Recreation Area offers a peaceful retreat in the heart of rugged grasslands. Over thousands of years, the Canadian River carved dramatic 2...
29 mi from route
~72 min detour
Free
near mile 795.9
Park data from the National Park Service API. Alerts update every 2 hours.
More Details
What kind of drive is this?
This route spends 68% of its time on highways. Expect a longest stretch of 122.7 miles on US 281, which means you'll have periods of continuous cruising. Around 32% of the drive will be on surface roads, so be ready for more frequent intersections and potentially slower speeds as you transition. You'll notice the change from high-speed travel to more localized driving as you leave the main highways.
68% highway — fuel and pacing are the main things to plan.
63 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 122.7 mi on US 281.
How Hard Is This Drive?
10/10
At 14h 20m, this is a long-haul route where pacing matters more than any single turn. This route has several spots where lane changes, forks, or exits need your full attention. The trickiest moment comes around 15.5 miles in.
Driving Effort10/10
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 45 significant decision points across 795.9 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 15.5 miles: Exit ramp - move to the correct lane early. Lane positioning matters here; at 15.6 miles: Highway fork - watch signs carefully. Lane positioning matters here; at 287.8 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one.
Elevation Profile
Hilly terrain with moderate elevation changes
3,670 ft8 ft
Total Climb
3,740 ft
Total Descent
78 ft
Highest Point
3,670 ft
~795.9 mi in
Elevation Range
3,662 ft
Towns Mentioned on Route Signs
Based on OSRM destination-sign hints, not a full list of every settlement the road passes.
Between Port Isabel, TX and Amarillo, TX, road signs point toward Alamodome, Menard and Lubbock.
The City of Port Isabel, population 6,300 in 2019, is the southernmost city and port on the Texas coast. It is a tourism, retirement, sports fishing and commercial fishing destination and the gateway to South Padre Island.
Top landmarks
•Point Isabel Lighthouse — structure in Port Isabel, Cameron County, Texas
The longest stretch is about 122.7 miles on US 281. The full list of main roads is in the Roads section above.
Yes — a 2-day pace is more comfortable than one long haul. A sensible stopping point is after roughly 398 miles on day one.
Yes — we found about 53 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 Amarillo, 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 4 meaningful breaks. There are 53 rest areas along the route for bathroom stops.
The main spots that need attention: at 15.5 miles: Exit ramp - move to the correct lane early. Lane positioning matters here; at 15.6 miles: Highway fork - watch signs carefully. Lane positioning matters here; at 287.8 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one.
Yes — San Antonio Missions National Historical Park, Palo Alto Battlefield National Historical Park and Alibates Flint Quarries National Monument (6 total within detour distance). See the National Parks section for detour distances and tips on detours.
Not recommended in a single day. At 14.3 hours each way, a round trip means 28.7 hours of driving — that is an unsafe level of fatigue for most drivers. Plan at least one night at Amarillo, TX before the return drive.
