How far is O'Fallon, MO from Saint George, MO?
The driving distance from O'Fallon, MO to Saint George, MO is about 38.8 miles (62.4 km), with a travel time of about 00h 51m by car.
- The straight-line flight distance is about 28.1 miles (45.2 km).
- For a round trip, plan for roughly 01h 43m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 8:00 AM to 10:00 AM CST.
Reverse, save, or send this route
This route works well as a day trip with time at the destination. Copy the route link, send it to another device, or print a clean version before you head out.
This route works well as a day trip with time at the destination.
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 00h 51m.
A morning start gives you useful time at the destination and keeps the return out of the late evening.
This departure sits inside the recommended comfort window for the route.
Halfway Point
A useful midpoint for breaks, coffee, or meeting in the middle.
City in Missouri, United States
Route Weather Snapshot
Check the forecast at both ends before you head out.
Slight Chance Drizzle
Slight Chance Drizzle then Partly Sunny
Driving Route Map
The map below follows the saved road route between O'Fallon and Saint George.
Turn-by-Turn Driving Directions
Step-by-step road directions between O'Fallon and Saint George.
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1
Start on the route
8 m · 7 sec
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2
Turn left onto South Main Street
3116 ft · 2 min · South Main Street
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3
Turn left onto Drennen Parkway
1.4 km · 1 min · Drennen Parkway
-
4
Take the ramp slight left toward I 70 East: Saint Louis
133 m · 6 sec
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5
Merge slight left
13.5 mi · 17 min
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6
Take the exit slight right toward I 270: Chicago, Memphis
872 ft · 12 sec
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7
Keep slight right to continue on I 270 South: Memphis
2339 ft · 33 sec
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8
Continue on I 270 South: Memphis
723 ft · 10 sec
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9
Merge slight left
19 mi · 24 min
-
10
Take the exit slight right toward I 55, US 61, US 67: Saint Louis, Memphis, Lemay Ferry Road
1911 ft · 27 sec
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11
Keep slight left to continue on I 55 North, US 61, US 67: Saint Louis
557 ft · 8 sec
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12
Continue on I 55 North, US 61, US 67: Saint Louis
797 ft · 11 sec
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13
Keep slight right to continue on I 55 North: Saint Louis
1.1 km · 2 min
-
14
Keep slight right to continue on I 55 North: Saint Louis
2446 ft · 52 sec
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15
Merge slight left
1.6 mi · 2 min
-
16
Take the exit slight right toward Reavis Barracks Road
742 ft · 24 sec
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17
Turn left onto Reavis Barracks Road
1755 ft · 45 sec · Reavis Barracks Road
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18
Turn right onto Huntingdon Lane
129 m · 15 sec · Huntingdon Lane
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19
Arrive at your destination
0 m · 1 sec · Huntingdon Lane
Car Route Details
A richer read on the saved driving route between O'Fallon and Saint George.
Highway-focused drive
Most of the mileage stays on named highways, so the important moments are ramps, exits, merges, and the final local approach.
I 270 South
Merge slight left
19 mi · 00h 24m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A comfortable day-trip route
This route works well as a day trip. You can leave in the morning, spend meaningful time at the destination, and still return the same day.
Slight Chance Drizzle leaving O'Fallon and Slight Chance Drizzle then Partly Sunny near Saint George.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from O'Fallon to Saint George?
The road trip is about 38.8 miles (62.4 km) and usually takes 00h 51m in normal driving conditions.
Is this a same-day trip or an overnight route?
This route works well as a day trip. You can leave in the morning, spend meaningful time at the destination, and still return the same day.
What is the halfway point on this route?
Maryland Heights is a useful midpoint, sitting about 19.4 miles from O'Fallon and 19.4 miles from Saint George.
How much longer is the road route than the straight-line distance?
The direct path is about 28.1 miles (45.2 km), while the road route adds roughly 10.7 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 8:00 AM to 10:00 AM CST. If you want a more comfortable same-day return, try to leave by 4:46 PM CST.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $5.20 one way or $10.41 round trip. Estimated CO2 is about 12.2 kg one way.
What should you check before leaving?
Before you leave, expect Slight Chance Drizzle around O'Fallon and Slight Chance Drizzle then Partly Sunny near Saint George.
Stop Ideas Near Maryland Heights
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 Maryland Heights.
Kirkwood
Gateway Transportation Center
Alton
Washington
Flight Path Map
This map shows the direct air route between O'Fallon and Saint George. Straight-line distance: 28.1 mi (45.22 km).
#1 O'Fallon
The most populous city in St.
| Population | 89,769 |
| Coordinates | 38.8106100, -90.6998500 |
| Altitude | 165 |
| Country | United States |
#2 Saint George
Saint George is a place in Missouri, United States.
| Population | 0 |
| Coordinates | 38.5367200, -90.3148400 |
| Altitude | 165 |
| Country | United States |
End: Saint George (-90.31484, 38.53672)
Estimated Travel Time
Distance: 62 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 01h 17m |
| 40 mph (64.37 km/h) | 00h 58m |
| 50 mph (80.47 km/h) | 00h 46m |
| 60 mph (96.56 km/h) | 00h 38m |
| 70 mph (112.65 km/h) | 00h 33m |
| 80 mph (129 km/h) | 00h 29m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.80 | $5.20 | $10.41 |
| Mid-grade | $4.17 | $5.71 | $11.41 |
| Premium | $4.53 | $6.20 | $12.40 |
| Diesel | $6.02 | $8.24 | $16.48 |
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 Missouri · Nov 05, 2026