How far is O'Fallon, MO from Grain Valley, MO?
The driving distance from O'Fallon, MO to Grain Valley, MO is about 194.6 miles (313.1 km), with a travel time of about 03h 41m by car.
- The straight-line flight distance is about 188.6 miles (303.5 km).
- For a round trip, plan for roughly 07h 23m 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 03h 41m.
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.
Human settlement in Missouri, United States of America
Route Weather Snapshot
Check the forecast at both ends before you head out.
Showers And Thunderstorms Likely then Chance Showers And Thunderstorms
Mostly Sunny
Driving Route Map
The map below follows the saved road route between O'Fallon and Grain Valley.
Turn-by-Turn Driving Directions
Step-by-step road directions between O'Fallon and Grain Valley.
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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 I 70 East
10 m · 6 sec
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4
Turn sharp left onto South Main Street
87 m · 11 sec · South Main Street
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5
Turn left onto West Terra Lane
576 ft · 12 sec · West Terra Lane
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6
Take the ramp straight toward I 70 West
146 m · 7 sec
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7
Merge slight left
193 mi · 3 hr 37 min
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8
Take the exit slight right toward MO AA, US 40, MO BB: Grain Valley, Buckner
1126 ft · 34 sec
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9
Turn left onto North Main Street
2530 ft · 1 min · North Main Street
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10
Turn right onto West Front Street
30 m · 4 sec · West Front Street
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11
Arrive at your destination
0 m · 1 sec · West Front Street
Car Route Details
A richer read on the saved driving route between O'Fallon and Grain Valley.
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 70 West
Merge slight left
193 mi · 03h 37m
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.
Showers And Thunderstorms Likely then Chance Showers And Thunderstorms leaving O'Fallon and Mostly Sunny near Grain Valley.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from O'Fallon to Grain Valley?
The road trip is about 194.6 miles (313.1 km) and usually takes 03h 41m 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?
Huntsdale is a useful midpoint, sitting about 97.1 miles from O'Fallon and 97.5 miles from Grain Valley.
How much longer is the road route than the straight-line distance?
The direct path is about 188.6 miles (303.5 km), while the road route adds roughly 6 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 9:36 AM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $25.87 one way or $51.74 round trip. Estimated CO2 is about 61 kg one way.
What should you check before leaving?
Before you leave, expect Showers And Thunderstorms Likely then Chance Showers And Thunderstorms around O'Fallon and Mostly Sunny near Grain Valley.
Stop Ideas Near Huntsdale
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 Huntsdale.
Jefferson City
Sedalia
Hermann
Warrensburg
Flight Path Map
This map shows the direct air route between O'Fallon and Grain Valley. Straight-line distance: 188.62 mi (303.55 km).
#1 O'Fallon
The most populous city in St.
| Population | 89,769 |
| Coordinates | 38.8106100, -90.6998500 |
| Altitude | 165 |
| Country | United States |
#2 Grain Valley
City in Jackson County, Missouri, United States
| Population | 14,827 |
| Coordinates | 39.0150100, -94.1985600 |
| Altitude | 242 |
| Country | United States |
End: Grain Valley (-94.19856, 39.01501)
Estimated Travel Time
Distance: 313 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 06h 28m |
| 40 mph (64.37 km/h) | 04h 51m |
| 50 mph (80.47 km/h) | 03h 53m |
| 60 mph (96.56 km/h) | 03h 14m |
| 70 mph (112.65 km/h) | 02h 46m |
| 80 mph (129 km/h) | 02h 25m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $25.87 | $51.74 |
| Mid-grade | $4.25 | $29.18 | $58.35 |
| Premium | $4.65 | $31.93 | $63.85 |
| Diesel | $5.30 | $36.39 | $72.77 |
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 01, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.