How far is San Marcos, TX from Amarillo, TX?
The driving distance from San Marcos, TX to Amarillo, TX is about 528.7 miles (850.9 km), with a travel time of about 08h 05m by car.
- The straight-line flight distance is about 432.8 miles (696.5 km).
- For a round trip, plan for roughly 16h 11m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 6:00 AM to 7:30 AM CDT.
Reverse, save, or send this route
This drive is better planned with a longer stop or an overnight stay. Copy the route link, send it to another device, or print a clean version before you head out.
This drive is better planned with a longer stop or an overnight stay.
Flight Distance
Driving Distance
Gas Cost Calculator
Leave and Arrive Planner
Pick a departure time to see your estimated arrival and same-day return window.
Drive time stays fixed at 08h 05m.
Starting early still helps, but most travelers will want a longer stop or an overnight stay on a route this long.
You are leaving earlier than the recommended window, which gives you extra margin for breaks and traffic.
Halfway Point
A useful midpoint for breaks, coffee, or meeting in the middle.
City in Nolan County, Texas, United States
Route Weather Snapshot
Check the forecast at both ends before you head out.
Areas Of Fog
Driving Route Map
The map below follows the saved road route between San Marcos and Amarillo.
Turn-by-Turn Driving Directions
Step-by-step road directions between San Marcos and Amarillo.
-
1
Start on North Guadalupe Street
23 m · 9 sec · North Guadalupe Street
-
2
Turn left onto East Hopkins Street
1.1 mi · 2 min · East Hopkins Street
-
3
Turn slight left
1141 ft · 49 sec
-
4
Turn straight onto North Interstate 35
3027 ft · 1 min · North Interstate 35
-
5
Take the ramp slight left toward I 35 North
1503 ft · 37 sec
-
6
Merge slight left onto Purple Heart Trail
29.1 mi · 32 min · Purple Heart Trail
-
7
Keep slight right to continue on Purple Heart Trail
4 mi · 5 min · Purple Heart Trail
-
8
Take the exit slight right toward US 183 North: Lampasas
1.4 km · 2 min
-
9
Merge slight left
11.3 mi · 13 min
-
10
Continue straight
14.6 mi · 15 min
-
11
Continue on North US Highway 183
35.7 mi · 39 min · North US Highway 183
-
12
Continue on South Key Avenue
2.3 mi · 5 min · South Key Avenue
-
13
Continue on North US Highway 281
965 ft · 15 sec · North US Highway 281
-
14
Keep slight left to continue on North US Highway 183
36.9 mi · 40 min · North US Highway 183
-
15
At the end of the road, turn left
30.4 mi · 35 min
-
16
Turn left onto Early Boulevard
1.7 mi · 2 min · Early Boulevard
-
17
Continue on East Commerce Street
22 mi · 25 min · East Commerce Street
-
18
Keep slight right to continue on Wallis Avenue
7.2 mi · 8 min · Wallis Avenue
-
19
Turn right onto East Walnut Street
1.5 km · 1 min · East Walnut Street
-
20
Continue on West Walnut Street
1 mi · 2 min · West Walnut Street
-
21
Continue on State Highway 153
69 mi · 1 hr 14 min · State Highway 153
-
22
Keep slight right to continue on State Highway 153
6 m · 1 sec · State Highway 153
-
23
Turn right onto State Highway 70
10.4 mi · 11 min · State Highway 70
-
24
Continue on Lamar Street
1.3 km · 1 min · Lamar Street
-
25
Turn left onto Northwest Georgia Avenue
670 ft · 17 sec · Northwest Georgia Avenue
-
26
Take the ramp slight left toward I 20 West: Midland
104 m · 8 sec
-
27
Merge slight left
6 mi · 6 min
-
28
Take the exit slight right toward US 84 West: Snyder, Lubbock
1721 ft · 20 sec
-
29
Keep slight left
74.2 mi · 1 hr 14 min
-
30
Turn right onto South Avenue F
1 mi · 2 min · South Avenue F
-
31
Keep slight left to continue on North Avenue F
617 ft · 11 sec · North Avenue F
-
32
Turn straight onto Ralls Road
1863 ft · 39 sec · Ralls Road
-
33
Turn left onto East 15th Street
734 ft · 17 sec · East 15th Street
-
34
Turn right onto North US Highway 84
1 mi · 1 min · North US Highway 84
-
35
Continue on Highway 84
20 mi · 20 min · Highway 84
-
36
Continue on Trooper Jerry Don Davis Memorial Highway
4.6 mi · 5 min · Trooper Jerry Don Davis Memorial Highway
-
37
Continue on East Highway 84
6.8 mi · 7 min · East Highway 84
-
38
Continue on Slaton Road
4.5 mi · 6 min · Slaton Road
-
39
Take the exit slight right
1302 ft · 27 sec
-
40
Turn slight right onto Interstate 27
98 m · 6 sec · Interstate 27
-
41
Take the ramp straight
1303 ft · 32 sec
-
42
Merge slight left onto Marshall Formby Memorial Highway
109.9 mi · 1 hr 51 min · Marshall Formby Memorial Highway
-
43
Continue on Canyon Expressway
13.5 mi · 15 min · Canyon Expressway
-
44
Keep slight left to continue on US 87 North
1.5 km · 2 min
-
45
Keep slight right to continue on South Fillmore Street
1.1 km · 2 min · South Fillmore Street
-
46
Turn right onto East Amarillo Boulevard
32 m · 1 sec · East Amarillo Boulevard
-
47
Arrive at your destination
0 m · 1 sec · East Amarillo Boulevard
Car Route Details
A richer read on the saved driving route between San Marcos and Amarillo.
Long-distance drive
This route is long enough that fuel, rest stops, weather, and timing matter more than any single maneuver.
Marshall Formby Memorial Highway
Merge slight left onto Marshall Formby Memorial Highway
110 mi · 01h 51m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
Better with a longer stop
This route is long enough that most travelers will be better off planning an overnight stay or a more deliberate stop window.
Sunny leaving San Marcos and Areas Of Fog near Amarillo.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from San Marcos to Amarillo?
The road trip is about 528.7 miles (850.9 km) and usually takes 08h 05m in normal driving conditions.
Is this a same-day trip or an overnight route?
This route is long enough that most travelers will be better off planning an overnight stay or a more deliberate stop window.
What is the halfway point on this route?
Blackwell is a useful midpoint, sitting about 262.6 miles from San Marcos and 266.1 miles from Amarillo.
How much longer is the road route than the straight-line distance?
The direct path is about 432.8 miles (696.5 km), while the road route adds roughly 95.9 extra miles because roads do not follow the straight air line.
When is the best time to leave for this route?
A good departure window is usually 6:00 AM to 7:30 AM CDT. Starting early still helps, but most travelers will want a longer stop or an overnight stay on a route this long.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $71.64 one way or $143.27 round trip. Estimated CO2 is about 165.8 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around San Marcos and Areas Of Fog near Amarillo.
Flight Path Map
This map shows the direct air route between San Marcos and Amarillo. Straight-line distance: 432.78 mi (696.49 km).
#1 San Marcos
The most populous city in Hays County, Texas.
| Population | 66,350 |
| Coordinates | 29.8832700, -97.9413900 |
| Altitude | 188 |
| Country | United States |
#2 Amarillo
The second most populous city in Texas Panhandle.
| Population | 199,654 |
| Coordinates | 35.2220000, -101.8313000 |
| Altitude | 1118 |
| Country | United States |
End: East Amarillo Boulevard (-101.8313, 35.221963)
Estimated Travel Time
Distance: 851 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 17h 36m |
| 40 mph (64.37 km/h) | 13h 13m |
| 50 mph (80.47 km/h) | 10h 34m |
| 60 mph (96.56 km/h) | 08h 48m |
| 70 mph (112.65 km/h) | 07h 33m |
| 80 mph (129 km/h) | 06h 35m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.84 | $71.64 | $143.27 |
| Mid-grade | $4.35 | $81.12 | $162.23 |
| Premium | $4.72 | $88.13 | $176.26 |
| Diesel | $5.78 | $107.78 | $215.56 |
Assumes 8.3 L/100 km (about 28.3 MPG). CO2 is an estimate and varies by vehicle, fuel blend, traffic, and terrain.
Prices in Texas · Oct 15, 2026