How far is O'Fallon, MO from Merriam Woods, MO?
The driving distance from O'Fallon, MO to Merriam Woods, MO is about 246 miles (395.9 km), with a travel time of about 04h 50m by car.
- The straight-line flight distance is about 197.7 miles (318.1 km).
- For a round trip, plan for roughly 09h 40m 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 04h 50m.
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 Pulaski County, Missouri, United States
Route Weather Snapshot
Check the forecast at both ends before you head out.
Sunny
Driving Route Map
The map below follows the saved road route between O'Fallon and Merriam Woods.
Turn-by-Turn Driving Directions
Step-by-step road directions between O'Fallon and Merriam Woods.
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1
Start on the route
8 m · 7 sec
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2
Turn left onto South Main Street
2865 ft · 1 min · South Main Street
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3
Continue straight
3.1 mi · 6 min
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4
Continue straight
3.4 mi · 5 min
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5
Take the ramp slight right toward I 64 East, US 40 East, US 61 South
1523 ft · 22 sec
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6
Merge slight left onto Avenue of the Saints
3.7 mi · 5 min · Avenue of the Saints
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7
Take the exit slight right toward Chesterfield Airport Road
2700 ft · 58 sec
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8
Continue on Chesterfield Airport Road
110 m · 7 sec · Chesterfield Airport Road
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9
Turn right onto Olive Street Road
64 m · 5 sec
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10
Turn right onto Olive Street Road
1.5 km · 2 min · Olive Street Road
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11
Continue on North Eatherton Road
2.4 mi · 5 min · North Eatherton Road
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12
Enter the roundabout and take exit 2 toward the route
21 m · 1 sec
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13
Exit the roundabout
4.3 mi · 7 min
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14
Enter the roundabout and take exit 2 toward the route
29 m · 2 sec
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15
Exit the roundabout
2098 ft · 45 sec
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16
Enter the roundabout and take exit 2 toward MO 100 West: Gray Summit
23 m · 2 sec
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17
Exit the roundabout onto MO 100 West: Gray Summit
1202 ft · 33 sec
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18
Merge slight left
13.3 mi · 19 min
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19
Take the exit slight right toward I 44 West, US 50 West: St. Clair
1157 ft · 14 sec
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20
Merge slight left
170.7 mi · 3 hr 4 min
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21
Take the exit slight right toward US 65 South: Branson
1412 ft · 48 sec
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22
Merge slight left onto Schoolcraft Freeway
11 mi · 14 min · Schoolcraft Freeway
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23
Continue on American Legion Memorial Highway
10.9 mi · 13 min · American Legion Memorial Highway
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24
Continue on US Highway 65
12 mi · 14 min · US Highway 65
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25
Continue on American Legion Memorial Highway
1.2 mi · 1 min · American Legion Memorial Highway
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26
Take the exit slight right toward US 160: Reed Springs Junction, Forsyth
1165 ft · 32 sec
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27
Turn left
4.3 mi · 6 min
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28
Turn slight left
973 ft · 17 sec
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29
Turn slight right
1.1 mi · 2 min
-
30
Turn left onto Old Trail Road
1118 ft · 50 sec · Old Trail Road
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31
Turn right onto North Homestead Road
708 ft · 32 sec · North Homestead Road
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32
Turn right onto Maybe Lake Road
70 m · 13 sec · Maybe Lake Road
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33
Turn left onto Deerfield Road
1296 ft · 57 sec · Deerfield Road
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34
Arrive at your destination
0 m · 1 sec · Deerfield Road
Car Route Details
A richer read on the saved driving route between O'Fallon and Merriam Woods.
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 44 West
Merge slight left
171 mi · 03h 04m
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.
Sunny leaving O'Fallon and Sunny near Merriam Woods.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from O'Fallon to Merriam Woods?
The road trip is about 246 miles (395.9 km) and usually takes 04h 50m 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?
Saint Robert is a useful midpoint, sitting about 123 miles from O'Fallon and 123 miles from Merriam Woods.
How much longer is the road route than the straight-line distance?
The direct path is about 197.7 miles (318.1 km), while the road route adds roughly 48.3 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 7:20 AM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $32.73 one way or $65.46 round trip. Estimated CO2 is about 77.1 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around O'Fallon and Sunny near Merriam Woods.
Stop Ideas Near Saint Robert
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 Saint Robert.
Jefferson City
Hermann
Flight Path Map
This map shows the direct air route between O'Fallon and Merriam Woods. Straight-line distance: 197.65 mi (318.08 km).
#1 O'Fallon
The most populous city in St.
| Population | 89,769 |
| Coordinates | 38.8106100, -90.6998500 |
| Altitude | 165 |
| Country | United States |
#2 Merriam Woods
City in Taney County, Missouri, United States of America
| Population | 1,859 |
| Coordinates | 36.7139500, -93.1618500 |
| Altitude | 264 |
| Country | United States |
End: Merriam Woods (-93.16185, 36.71395)
Estimated Travel Time
Distance: 396 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 08h 11m |
| 40 mph (64.37 km/h) | 06h 09m |
| 50 mph (80.47 km/h) | 04h 55m |
| 60 mph (96.56 km/h) | 04h 06m |
| 70 mph (112.65 km/h) | 03h 30m |
| 80 mph (129 km/h) | 03h 04m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $32.73 | $65.46 |
| Mid-grade | $4.25 | $36.92 | $73.83 |
| Premium | $4.65 | $40.40 | $80.79 |
| Diesel | $5.30 | $46.04 | $92.08 |
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 · May 14, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.