How far is O'Fallon, MO from Marlborough, MO?
The driving distance from O'Fallon, MO to Marlborough, MO is about 34.1 miles (54.8 km), with a travel time of about 00h 48m by car.
- The straight-line flight distance is about 25.7 miles (41.3 km).
- For a round trip, plan for roughly 01h 36m 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 48m.
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.
Slight Chance Drizzle
Patchy Drizzle
Driving Route Map
The map below follows the saved road route between O'Fallon and Marlborough.
Turn-by-Turn Driving Directions
Step-by-step road directions between O'Fallon and Marlborough.
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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
19.8 mi · 25 min
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6
Take the exit slight right toward I 170 South: Clayton
1906 ft · 41 sec
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7
Merge slight left onto Inner Belt Expressway
7.1 mi · 9 min · Inner Belt Expressway
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8
Take the exit slight right toward Brentwood Boulevard North, Eager Road
1010 ft · 22 sec
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9
Keep slight left to continue on Eager Road
156 m · 11 sec
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10
Continue on Eager Road
566 ft · 14 sec
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11
Turn left onto Eager Road
1895 ft · 49 sec · Eager Road
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12
Turn slight right
156 m · 19 sec
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13
Keep slight left
42 m · 5 sec
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14
Turn right onto South Hanley Road
1.6 mi · 4 min · South Hanley Road
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15
Continue on Laclede Station Road
2.5 mi · 4 min · Laclede Station Road
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16
Turn left onto Wimbledon Drive
868 ft · 41 sec · Wimbledon Drive
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17
Turn right onto Watson Road
46 m · 3 sec · Watson Road
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18
Arrive at your destination
0 m · 1 sec · Watson Road
Car Route Details
A richer read on the saved driving route between O'Fallon and Marlborough.
Turn-heavy local drive
The route has frequent decision points for its length, so lane choice and turn timing will matter more than cruising speed.
I 70 East
Merge slight left
19.8 mi · 00h 25m
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 Patchy Drizzle near Marlborough.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from O'Fallon to Marlborough?
The road trip is about 34.1 miles (54.8 km) and usually takes 00h 48m 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?
Bridgeton is a useful midpoint, sitting about 17 miles from O'Fallon and 17 miles from Marlborough.
How much longer is the road route than the straight-line distance?
The direct path is about 25.7 miles (41.3 km), while the road route adds roughly 8.4 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 4:54 PM CST.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $4.53 one way or $9.06 round trip. Estimated CO2 is about 10.7 kg one way.
What should you check before leaving?
Before you leave, expect Slight Chance Drizzle around O'Fallon and Patchy Drizzle near Marlborough.
Stop Ideas Near Bridgeton
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 Bridgeton.
Kirkwood
Gateway Transportation Center
Alton
Washington
Flight Path Map
This map shows the direct air route between O'Fallon and Marlborough. Straight-line distance: 25.66 mi (41.3 km).
#1 O'Fallon
The most populous city in St.
| Population | 89,769 |
| Coordinates | 38.8106100, -90.6998500 |
| Altitude | 165 |
| Country | United States |
#2 Marlborough
Marlborough is a place in Missouri, United States.
| Population | 0 |
| Coordinates | 38.5703300, -90.3370600 |
| Altitude | 164 |
| Country | United States |
End: Marlborough (-90.33706, 38.57033)
Estimated Travel Time
Distance: 55 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 01h 08m |
| 40 mph (64.37 km/h) | 00h 51m |
| 50 mph (80.47 km/h) | 00h 40m |
| 60 mph (96.56 km/h) | 00h 34m |
| 70 mph (112.65 km/h) | 00h 29m |
| 80 mph (129 km/h) | 00h 25m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $4.53 | $9.06 |
| Mid-grade | $4.15 | $4.98 | $9.96 |
| Premium | $4.51 | $5.42 | $10.83 |
| Diesel | $6.00 | $7.20 | $14.39 |
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 06, 2026