How far is O'Fallon, MO from Lemay, MO?
The driving distance from O'Fallon, MO to Lemay, MO is about 39.7 miles (63.9 km), with a travel time of about 00h 55m by car.
- The straight-line flight distance is about 29.7 miles (47.8 km).
- For a round trip, plan for roughly 01h 50m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 8:00 AM to 10:00 AM CDT.
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 55m.
A morning start gives you useful time at the destination and keeps the return out of the late evening.
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.
Route Weather Snapshot
Check the forecast at both ends before you head out.
Driving Route Map
The map below follows the saved road route between O'Fallon and Lemay.
Turn-by-Turn Driving Directions
Step-by-step road directions between O'Fallon and Lemay.
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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
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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
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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 left to continue on US 61, US 67
1885 ft · 42 sec
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14
Turn left onto Lemay Ferry Road
3.5 mi · 7 min · Lemay Ferry Road
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15
Turn right onto Paule Avenue
1200 ft · 58 sec · Paule Avenue
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16
At the end of the road, turn left onto Dammert Avenue
69 m · 12 sec · Dammert Avenue
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17
Turn right onto Placid Avenue
652 ft · 34 sec · Placid Avenue
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18
Turn left onto Rembold Avenue
61 m · 9 sec · Rembold Avenue
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19
Arrive at your destination
0 m · 1 sec · Rembold Avenue
Car Route Details
A richer read on the saved driving route between O'Fallon and Lemay.
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.
Sunny leaving O'Fallon and Sunny near Lemay.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from O'Fallon to Lemay?
The road trip is about 39.7 miles (63.9 km) and usually takes 00h 55m 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?
Creve Coeur is a useful midpoint, sitting about 19.9 miles from O'Fallon and 19.9 miles from Lemay.
How much longer is the road route than the straight-line distance?
The direct path is about 29.7 miles (47.8 km), while the road route adds roughly 10 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 CDT. If you want a more comfortable same-day return, try to leave by 4:40 PM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $5.28 one way or $10.56 round trip. Estimated CO2 is about 12.4 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around O'Fallon and Sunny near Lemay.
Stop Ideas Near Creve Coeur
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 Creve Coeur.
Kirkwood
Gateway Transportation Center
Alton
Washington
Flight Path Map
This map shows the direct air route between O'Fallon and Lemay. Straight-line distance: 29.69 mi (47.78 km).
#1 O'Fallon
The most populous city in St.
| Population | 89,769 |
| Coordinates | 38.8106100, -90.6998500 |
| Altitude | 165 |
| Country | United States |
#2 Lemay
Census designated place
| Population | 16,645 |
| Coordinates | 38.5333900, -90.2792800 |
| Altitude | 144 |
| Country | United States |
End: Lemay (-90.27928, 38.53339)
Estimated Travel Time
Distance: 64 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 01h 19m |
| 40 mph (64.37 km/h) | 00h 59m |
| 50 mph (80.47 km/h) | 00h 47m |
| 60 mph (96.56 km/h) | 00h 39m |
| 70 mph (112.65 km/h) | 00h 34m |
| 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 | $3.77 | $5.28 | $10.56 |
| Mid-grade | $4.25 | $5.95 | $11.91 |
| Premium | $4.65 | $6.52 | $13.03 |
| Diesel | $5.30 | $7.43 | $14.85 |
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 · Jun 04, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.