How far is San Antonio, TX from Allen, TX?
The driving distance from San Antonio, TX to Allen, TX is about 298.3 miles (480 km), with a travel time of about 05h 21m by car.
- The straight-line flight distance is about 276.1 miles (444.3 km).
- For a round trip, plan for roughly 10h 43m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 6:00 AM to 8:00 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 05h 21m.
An early departure helps you fit a real stop into the day without turning the return into a late-night drive.
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 Bell County, Texas
Route Weather Snapshot
Check the forecast at both ends before you head out.
Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms
Slight Chance Showers And Thunderstorms
Driving Route Map
The map below follows the saved road route between San Antonio and Allen.
Turn-by-Turn Driving Directions
Step-by-step road directions between San Antonio and Allen.
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1
Start on Dolorosa Street
44 m · 5 sec · Dolorosa Street
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2
Continue on West Market Street
1893 ft · 42 sec · West Market Street
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3
Continue on East Market Street
2143 ft · 46 sec · East Market Street
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4
Turn left
111 m · 13 sec
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5
Turn straight onto East Commerce Street
66 m · 13 sec · East Commerce Street
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6
Take the ramp sharp left toward US 281 North, I 37 North
1159 ft · 28 sec
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7
Merge slight left onto William J Bordelon Freeway
1.3 km · 56 sec · William J Bordelon Freeway
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8
Take the exit slight right toward I 35 North: Austin
2907 ft · 1 min
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9
Merge slight left onto North Pan Am Expressway
8.2 mi · 10 min · North Pan Am Expressway
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10
Keep slight left to continue on North Pan Am Expressway
7.4 mi · 8 min · North Pan Am Expressway
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11
Continue on Purple Heart Trail
11.9 mi · 13 min · Purple Heart Trail
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12
Continue on Interstate Highway 35
1.9 mi · 2 min · Interstate Highway 35
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13
Continue on Purple Heart Trail
47.8 mi · 52 min · Purple Heart Trail
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14
Keep slight right to continue on Purple Heart Trail
95.6 mi · 1 hr 40 min · Purple Heart Trail
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15
Continue on South Jack Kultgen Expressway
6.6 mi · 8 min · South Jack Kultgen Expressway
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16
Continue on Purple Heart Trail
33 mi · 33 min · Purple Heart Trail
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17
Keep slight right to continue on I 35E: Dallas
56.2 mi · 58 min
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18
Take the exit slight right toward I 30 East: Texarkana, Riverfront Boulevard, Griffin Street
2094 ft · 42 sec
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19
Keep slight left to continue on I 35E North, I 30 West: Denton, Fort Worth, Texarkana
129 m · 6 sec
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20
Keep slight right to continue on I 30 East: Texarkana, Convention Center
2206 ft · 33 sec
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21
Keep slight left to continue on I 30 East: Texarkana
117 m · 6 sec
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22
Continue on East R L Thornton Freeway
1.2 km · 1 min · East R L Thornton Freeway
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23
Take the exit slight right toward I 45, US 75: Houston, McKinney
2421 ft · 46 sec
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24
Keep slight left to continue on US 75 North: McKinney
2512 ft · 1 min
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25
Keep slight right to continue on US 75 North: McKinney, Bryan Street East
1697 ft · 27 sec
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26
Merge slight left onto Julius Schepps Freeway
1.2 km · 49 sec · Julius Schepps Freeway
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27
Continue on North Central Expressway
22.3 mi · 24 min · North Central Expressway
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28
Take the exit slight right toward McDermott Drive
891 ft · 17 sec
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29
Turn straight onto South Central Expressway
2870 ft · 51 sec · South Central Expressway
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30
Continue on North Central Expressway
566 ft · 15 sec · North Central Expressway
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31
Turn right onto West Main Street
1976 ft · 58 sec · West Main Street
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32
Arrive at your destination
0 m · 1 sec · West Main Street
Car Route Details
A richer read on the saved driving route between San Antonio and Allen.
Interchange-aware route
The drive includes several ramps, exits, or merges, so checking the next few maneuvers before busy interchanges is useful.
Purple Heart Trail
Keep slight right to continue on Purple Heart Trail
95.6 mi · 01h 40m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A longer out-and-back drive
This is still possible in one day, but it becomes a long driving day. Leaving early and planning your stop window matters more here.
Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms leaving San Antonio and Slight Chance Showers And Thunderstorms near Allen.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from San Antonio to Allen?
The road trip is about 298.3 miles (480 km) and usually takes 05h 21m in normal driving conditions.
Is this a same-day trip or an overnight route?
This is still possible in one day, but it becomes a long driving day. Leaving early and planning your stop window matters more here.
What is the halfway point on this route?
Troy is a useful midpoint, sitting about 149.4 miles from San Antonio and 148.9 miles from Allen.
How much longer is the road route than the straight-line distance?
The direct path is about 276.1 miles (444.3 km), while the road route adds roughly 22.2 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 8:00 AM CDT. If you want a more comfortable same-day return, try to leave by 6:16 AM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $39.76 one way or $79.51 round trip. Estimated CO2 is about 93.5 kg one way.
What should you check before leaving?
Before you leave, expect Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms around San Antonio and Slight Chance Showers And Thunderstorms near Allen.
Stop Ideas Near Troy
Useful break, food, and waypoint ideas within about 15 miles of the route midpoint.
Transit and Meeting Points
Useful pickup, handoff, or rendezvous points close to Troy.
Temple
McGregor
Killeen, Texas
Waco, TX
Flight Path Map
This map shows the direct air route between San Antonio and Allen. Straight-line distance: 276.04 mi (444.25 km).
#1 San Antonio
The seventh most populous city in the United States and the center of the San Antonio metropolitan area.
| Population | 1,567,118 |
| Coordinates | 29.4241200, -98.4936300 |
| Altitude | 198 |
| Country | United States |
#2 Allen
The fifth most populous city in Collin County, Texas.
| Population | 109,379 |
| Coordinates | 33.1031700, -96.6705500 |
| Altitude | 201 |
| Country | United States |
End: Allen (-96.67055, 33.10317)
Estimated Travel Time
Distance: 480 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 09h 56m |
| 40 mph (64.37 km/h) | 07h 27m |
| 50 mph (80.47 km/h) | 05h 57m |
| 60 mph (96.56 km/h) | 04h 58m |
| 70 mph (112.65 km/h) | 04h 15m |
| 80 mph (129 km/h) | 03h 43m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.78 | $39.76 | $79.51 |
| Mid-grade | $4.25 | $44.73 | $89.46 |
| Premium | $4.59 | $48.30 | $96.59 |
| Diesel | $3.99 | $42.01 | $84.01 |
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 · Apr 22, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.