Origin
O'Fallon, MO
Afternoon in O'Fallon on Monday
Local time
12:29 PM
CDT
Current temp
53°F
Unavailable
Live forecast
Trip from O'Fallon, MO to Merriam Woods, MO
Drive Time
4h 50m
Distance
246 mi
396 km
Drive Score
8/10
Great drive
Same Day?
Yes, doable
Fuel Cost
$37
one way
EV Charging
Loading...
station data
Best Time to Leave
4 AM
4h 37m
★
6 AM
4h 50m
8 AM
5h 17m
10 AM
5h 0m
12 PM
4h 57m
3 PM
5h 1m
5 PM
5h 16m
8 PM
4h 42m
Estimated drive times based on typical traffic patterns. Actual times may vary with weather, construction, and real-time conditions.
O'Fallon, MO
Wikimedia Commons
Merriam Woods, MO
Sean Ewing
Trip Overview
The drive from O'Fallon, MO to Merriam Woods, MO covers 246 miles and takes about 4h 50m behind the wheel. This route is realistic as a one-day drive if you keep your stops efficient.
The route leans on South Main Street, I 64 East, Avenue of the Saints for much of the mileage, and the overall profile is turn-heavy local drive. At current regular gas prices, budget about $37.36 one way before food or hotel costs.
Trip Pace
Same-day drive is realistic
A same-day return is possible, but it will make for a full day on the road.
Break Rhythm
1 planned break
Plan on a short reset every 3 to 4 hours to stay fresh behind the wheel.
Midpoint
123 miles from O'Fallon, MO
A natural place for your longest stop of the day , about 2h 25m into the drive .
Drive Character
Expect a 4h 50m drive with frequent turns across 246 miles of local and secondary roads.
This route has more turning and local-road decision points than a simple highway run.
There are about 34 navigation steps in the underlying route data, so the final approach matters more than the middle miles.
South Main Street is one of the defining roads on this drive.
How Hard Is This Drive?
Expect a hands-on drive with frequent turns and local roads rather than long highway stretches. There are only a few real navigation decisions along the way.
Route Complexity
3/10
Easy - simple navigation with a manageable amount of wheel time
This is a straightforward 4h 50m drive. You will face about 0 decision points, but nothing that requires special attention if you follow navigation.
Where does it get tricky?
This route does not have any notably tricky sections. Most of the drive from O'Fallon, MO to Merriam Woods, MO is straightforward, with well-signed roads and simple exits.
Main Roads
| Road | Distance | Duration |
|---|---|---|
| South Main Street | Unavailable | Refreshing |
| I 64 East | Unavailable | Refreshing |
| Avenue of the Saints | Unavailable | Refreshing |
| Chesterfield Airport Road | Unavailable | Refreshing |
| Olive Street Road | Unavailable | Refreshing |
| North Eatherton Road | Unavailable | Refreshing |
| the route | Unavailable | Refreshing |
| MO 100 West | Unavailable | Refreshing |
Per-road distance and duration are being refreshed from OSRM for this route.
Longest stretch:
South Main Street
— detailed segment metrics are refreshing.
Turn-by-Turn Driving Directions
Step-by-step road directions between O'Fallon, MO and Merriam Woods, MO.
1
Start on the route
26 ft
·
7 sec
·
the route
2
Turn left onto South Main Street
0.5 mi
·
1 min
·
South Main Street
3
Continue straight
3.1 mi
·
5 min
4
Continue straight
3.4 mi
·
5 min
5
Take the ramp slight right toward I 64 East, US 40 East, US 61 South
0.3 mi
·
22 sec
·
I 64 East, US 40 East, US 61 South
6
Merge slight left onto Avenue of the Saints
3.7 mi
·
4 min
·
Avenue of the Saints
7
Take the exit slight right toward Chesterfield Airport Road
0.5 mi
·
58 sec
·
Chesterfield Airport Road
8
Continue on Chesterfield Airport Road
361 ft
·
7 sec
·
Chesterfield Airport Road
9
Turn right onto Olive Street Road
210 ft
·
5 sec
·
Olive Street Road
10
Turn right onto Olive Street Road
0.9 mi
·
1 min
·
Olive Street Road
11
Continue on North Eatherton Road
2.4 mi
·
4 min
·
North Eatherton Road
12
Enter the roundabout and take exit 2 toward the route
69 ft
·
1 sec
·
the route
13
Exit the roundabout
4.3 mi
·
6 min
14
Enter the roundabout and take exit 2 toward the route
95 ft
·
2 sec
·
the route
15
Exit the roundabout
0.4 mi
·
45 sec
16
Enter the roundabout and take exit 2 toward MO 100 West: Gray Summit
75 ft
·
2 sec
·
MO 100 West: Gray Summit
17
Exit the roundabout onto MO 100 West: Gray Summit
0.2 mi
·
33 sec
·
MO 100 West: Gray Summit
18
Merge slight left
13 mi
·
18 min
19
Take the exit slight right toward I 44 West, US 50 West: St. Clair
0.2 mi
·
14 sec
·
I 44 West, US 50 West: St. Clair
20
Merge slight left
171 mi
·
3 hr 3 min
21
Take the exit slight right toward US 65 South: Branson
0.3 mi
·
48 sec
·
US 65 South: Branson
22
Merge slight left onto Schoolcraft Freeway
11 mi
·
13 min
·
Schoolcraft Freeway
23
Continue on American Legion Memorial Highway
11 mi
·
12 min
·
American Legion Memorial Highway
24
Continue on US Highway 65
12 mi
·
13 min
·
US Highway 65
25
Continue on American Legion Memorial Highway
1.2 mi
·
1 min
·
American Legion Memorial Highway
26
Take the exit slight right toward US 160: Reed Springs Junction, Forsyth
0.2 mi
·
32 sec
·
US 160: Reed Springs Junction, Forsyth
27
Turn left
4.3 mi
·
6 min
28
Turn slight left
0.2 mi
·
17 sec
29
Turn slight right
1.1 mi
·
1 min
30
Turn left onto Old Trail Road
0.2 mi
·
50 sec
·
Old Trail Road
31
Turn right onto North Homestead Road
0.1 mi
·
32 sec
·
North Homestead Road
32
Turn right onto Maybe Lake Road
230 ft
·
13 sec
·
Maybe Lake Road
33
Turn left onto Deerfield Road
0.2 mi
·
57 sec
·
Deerfield Road
34
Arrive at your destination
Trip Plan
Morning Departure
An early start around 7-8 AM gets you there with plenty of daylight left.
Evening Departure
A late afternoon start means arriving after dark. Morning is better.
You can normally do this drive in one day.
Plan roughly 1 meaningful break for fuel, food, and rest.
The halfway point lands around 123 miles from O'Fallon, MO, or about 2h 25m into the drive.
This is a comfortable same-day trip.
Departure
Before you leave
Start with fuel, water, and navigation already sorted so the first hour feels easy.
First stop
Around 80 miles or 1h 34m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 123 miles or 2h 25m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Final approach
Final hour starts around 3h 58m
Traffic, exits, and arrival timing usually matter more near Merriam Woods, MO than in the middle of the route.
Before You Leave
+
Open the route before leaving O'Fallon, MO so your first major turns are already loaded.
+
Leave with enough water and a charging cable within reach, not packed away.
+
Check your fuel range against the first long segment, especially if you are starting outside city service areas.
Day 1
Settle into the route from O'Fallon, MO
This is one driving day of about 246 miles and 4h 50m.
Your first comfortable stop window is around 80 miles from O'Fallon, MO.
This route can stay practical as a one-day drive if traffic stays reasonable.
Plan about 1 real break rather than only quick fuel stops.
Where to Stop
Rest stops, refuel points, and overnight suggestions along this route.
Halfway Point
Midpoint
About 123 mi from O'Fallon, MO · 2h 25m into the drive
Mid-route town
Meal stop
123 mi into the route
Best for: Lunch, fuel, and a longer reset
This sits close to the middle of the route, so it works well for the longest stop of the day.
Pacing Suggestions
Fuel and coffee
A short stop after about 80 miles helps settle the day before fatigue starts building.
Meal break
The midpoint is around 123 miles from O'Fallon, MO, which is a good place for a longer meal and fuel stop.
Arriving in Merriam Woods, MO
The final approach into Merriam Woods, MO usually feels slower than the middle of the drive, so avoid planning your tightest schedule at the very end.
Try to arrive with enough fuel left to skip an immediate station stop unless you already know the area around Merriam Woods, MO.
These stop ideas are pacing suggestions — the exact town or exit can change with traffic, hotel plans, and fuel range.
Fuel & Cost
Regular Gas
$37.36 one way
$74.73 round trip
$3.86/gal
25.4 MPG avg
86 kg CO2
| Fuel Type | $/gal | One Way | Round Trip |
|---|---|---|---|
| midgrade | $4.25 | $41.19 | $82.38 |
| premium | $4.80 | $46.44 | $92.88 |
| diesel | $5.64 | $54.65 | $109.31 |
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$37
Meals
$25–$50
Total
$62–$87
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 86.1 kg one way. Prices: EIA weekly data, 2026-04-06.
Driving Electric?
About $26 in charging · 0 stops · 66% less CO2
| Vehicle Type | kWh | Stops | DC Fast | Home Charge |
|---|---|---|---|---|
| Average EV | 73.8 | 0 | $25.83 | $11.81 |
| Efficient EV | 61.5 | 0 | $21.53 | $9.84 |
| EV Truck/SUV | 98.4 | 1 | $34.44 | $15.74 |
Gas CO2
86 kg
EV CO2
29 kg (66% less)
Plan for 0 charging stops, roughly every 270 miles. Allow 25-40 minutes per stop at a DC fast charger.
DC fast charging avg $0.35/kWh. Home charging avg $0.16/kWh. US grid CO2: 0.39 kg/kWh.
Travel Intel
Current conditions at both ends of the drive.
Destination
Merriam Woods, MO
Afternoon in Merriam Woods on Monday
Local time
12:29 PM
CDT
Current temp
58°F
Unavailable
Live forecast
Seasonal Notes
Summer travel usually means heavier construction, hotter rest stops, and busier weekend traffic around major cities.
Winter travel shortens daylight, so a route that looks manageable on paper can feel much longer after dark.
Holiday weekends tend to make both departure and arrival windows slower than the raw route time suggests.
Time zone
Same local time
Origin and destination are on the same clock, so arrival timing is easier to judge at a glance.
Temperature spread
5 degrees warmer at arrival
A meaningful temperature swing is a good cue to rethink layers, water, and how soon you want to arrive.
Road read
4h 50m on the road
An early start around 7-8 AM gets you there with plenty of daylight left.
Weather data from the National Weather Service. Conditions may change; check closer to your travel date.
Frequently Asked Questions
The drive from O'Fallon, MO to Merriam Woods, MO covers 246 miles and takes about 4h 50m without stops. Add 15-30 minutes for a fuel or rest stop on longer drives.
The main roads are South Main Street, I 64 East, Avenue of the Saints. Expect a mix of highway and local road driving.
This is a comfortable same-day trip.
The midpoint is about 123 miles from O'Fallon, MO. Look for rest areas, gas stations, or food options near the halfway mark.
At current regular gas prices, expect to spend about $37.36 one way. This estimate uses 25.4 MPG — your actual cost will vary with your vehicle's fuel efficiency and current gas prices.
An early start around 7-8 AM gets you there with plenty of daylight left. A late afternoon start means arriving after dark. Morning is better.
Plan about 1 meaningful break for fuel, food, or rest. Plan on a short reset every 3 to 4 hours to stay fresh behind the wheel.
This is a straightforward 4h 50m drive. You will face about 0 decision points, but nothing that requires special attention if you follow navigation.
This route does not have any notably tricky sections. Most of the drive from O'Fallon, MO to Merriam Woods, MO is straightforward, with well-signed roads and simple exits.
The route from O'Fallon, MO to Merriam Woods, MO does not surface many named destination signs beyond the main corridor.
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