How far is Dallas, TX from San Leon, TX?
The driving distance from Dallas, TX to San Leon, TX is about 279.3 miles (449.5 km), with a travel time of about 05h 05m by car.
- The straight-line flight distance is about 253.8 miles (408.4 km).
- For a round trip, plan for roughly 10h 10m 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 05m.
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 Texas, USA
Route Weather Snapshot
Check the forecast at both ends before you head out.
Chance Showers And Thunderstorms
Showers And Thunderstorms
Driving Route Map
The map below follows the saved road route between Dallas and San Leon.
Turn-by-Turn Driving Directions
Step-by-step road directions between Dallas and San Leon.
-
1
Start on North Lamar Street
132 m · 14 sec · North Lamar Street
-
2
Turn right onto McKinney Avenue
1118 ft · 25 sec · McKinney Avenue
-
3
Take the ramp slight left toward US 75 North
1229 ft · 30 sec
-
4
Merge slight left onto Woodall Rodgers Freeway
2170 ft · 37 sec · Woodall Rodgers Freeway
-
5
Keep slight right to continue on I 45 South: Houston
2537 ft · 49 sec
-
6
Merge slight left onto Julius Schepps Freeway
3.1 mi · 4 min · Julius Schepps Freeway
-
7
Keep slight left to continue on Julius Schepps Freeway
234.2 mi · 4 hr 6 min · Julius Schepps Freeway
-
8
Continue on Gulf Freeway
28.6 mi · 34 min · Gulf Freeway
-
9
Take the exit slight right toward FM 517: Dickinson
1204 ft · 29 sec
-
10
Turn straight onto South Gulf Freeway Frontage Road
1.4 km · 2 min · South Gulf Freeway Frontage Road
-
11
Turn left onto Pine Drive
1.5 mi · 2 min · Pine Drive
-
12
Continue on Pine Street
1717 ft · 31 sec · Pine Street
-
13
Continue on Main Street
2280 ft · 40 sec · Main Street
-
14
Turn slight right onto 41st Street East
4.2 mi · 6 min · 41st Street East
-
15
Continue on Avenue S
1.6 mi · 3 min · Avenue S
-
16
Turn slight right
2.8 mi · 5 min
-
17
Arrive at your destination
0 m · 1 sec · Avenue I
Car Route Details
A richer read on the saved driving route between Dallas and San Leon.
Highway-focused drive
Most of the mileage stays on named highways, so the important moments are ramps, exits, merges, and the final local approach.
Julius Schepps Freeway
Keep slight left to continue on Julius Schepps Freeway
234 mi · 04h 06m
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 leaving Dallas and Showers And Thunderstorms near San Leon.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Dallas to San Leon?
The road trip is about 279.3 miles (449.5 km) and usually takes 05h 05m 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?
Madisonville is a useful midpoint, sitting about 139.9 miles from Dallas and 139.4 miles from San Leon.
How much longer is the road route than the straight-line distance?
The direct path is about 253.8 miles (408.4 km), while the road route adds roughly 25.5 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 6:50 AM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $37.26 one way or $74.52 round trip. Estimated CO2 is about 87.6 kg one way.
What should you check before leaving?
Before you leave, expect Chance Showers And Thunderstorms around Dallas and Showers And Thunderstorms near San Leon.
Stop Ideas Near Madisonville
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 Madisonville.
Bryan, TX
Prairie View, TX
Flight Path Map
This map shows the direct air route between Dallas and San Leon. Straight-line distance: 253.76 mi (408.39 km).
#1 Dallas
The ninth most populous city in the United States and the center of the Dallas-Fort Worth metropolitan area.
| Population | 1,343,266 |
| Coordinates | 32.7830600, -96.8066700 |
| Altitude | 128 |
| Country | United States |
#2 San Leon
Census designated place
| Population | 4,970 |
| Coordinates | 29.4832900, -94.9221500 |
| Altitude | 3 |
| Country | United States |
End: San Leon (-94.92215, 29.48329)
Estimated Travel Time
Distance: 449 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 09h 18m |
| 40 mph (64.37 km/h) | 06h 58m |
| 50 mph (80.47 km/h) | 05h 35m |
| 60 mph (96.56 km/h) | 04h 39m |
| 70 mph (112.65 km/h) | 03h 59m |
| 80 mph (129 km/h) | 03h 29m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.78 | $37.26 | $74.52 |
| Mid-grade | $4.25 | $41.92 | $83.85 |
| Premium | $4.59 | $45.27 | $90.53 |
| Diesel | $3.99 | $39.37 | $78.74 |
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 23, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.