How far is Hallsville, MO from O'Fallon, MO?
The driving distance from Hallsville, MO to O'Fallon, MO is about 98.8 miles (159 km), with a travel time of about 01h 37m by car.
- The straight-line flight distance is about 84.4 miles (135.8 km).
- For a round trip, plan for roughly 03h 14m 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 01h 37m.
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.
City in Missouri, United States
Route Weather Snapshot
Check the forecast at both ends before you head out.
Mostly Sunny then Showers And Thunderstorms Likely
Mostly Sunny then Chance Showers And Thunderstorms
Driving Route Map
The map below follows the saved road route between Hallsville and O'Fallon.
Turn-by-Turn Driving Directions
Step-by-step road directions between Hallsville and O'Fallon.
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1
Start on the route
5 m · 7 sec
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2
Turn right
10 mi · 15 min
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3
Take the ramp left toward US 63 South: Jefferson City
856 ft · 21 sec
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4
Merge slight left
1.1 mi · 1 min
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5
Take the exit slight right toward MO PP, I 70, US 40: Kansas City, Saint Louis
2467 ft · 56 sec
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6
Turn straight
2352 ft · 55 sec
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7
Take the exit left toward I 70 East, US 40 East: Saint Louis
1271 ft · 31 sec
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8
Continue on Dwight D. Eisenhower Highway
88.2 mi · 1 hr 44 min · Dwight D. Eisenhower Highway
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9
Take the exit slight right toward MO K: O'Fallon
1765 ft · 43 sec
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10
Turn straight onto Drennen Parkway
46 m · 3 sec · Drennen Parkway
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11
Keep slight right to continue on Drennen Parkway
51 m · 6 sec · Drennen Parkway
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12
Turn slight left onto MO K: O'Fallon
19 m · 3 sec
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13
Continue on South Main Street
3115 ft · 2 min · South Main Street
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14
Turn right
8 m · 2 sec
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15
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between Hallsville and O'Fallon.
Highway-focused drive
Most of the mileage stays on named highways, so the important moments are ramps, exits, merges, and the final local approach.
Dwight D. Eisenhower Highway
Continue on Dwight D. Eisenhower Highway
88.2 mi · 01h 44m
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.
Mostly Sunny then Showers And Thunderstorms Likely leaving Hallsville and Mostly Sunny then Chance Showers And Thunderstorms near O'Fallon.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Hallsville to O'Fallon?
The road trip is about 98.8 miles (159 km) and usually takes 01h 37m 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?
Montgomery City is a useful midpoint, sitting about 50.8 miles from Hallsville and 48 miles from O'Fallon.
How much longer is the road route than the straight-line distance?
The direct path is about 84.4 miles (135.8 km), while the road route adds roughly 14.4 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 CDT. If you want a more comfortable same-day return, try to leave by 3:16 PM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $13.16 one way or $26.32 round trip. Estimated CO2 is about 31 kg one way.
What should you check before leaving?
Before you leave, expect Mostly Sunny then Showers And Thunderstorms Likely around Hallsville and Mostly Sunny then Chance Showers And Thunderstorms near O'Fallon.
Stop Ideas Near Montgomery City
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 Montgomery City.
Hermann
Washington
Jefferson City
Kirkwood
Flight Path Map
This map shows the direct air route between Hallsville and O'Fallon. Straight-line distance: 84.4 mi (135.83 km).
#1 Hallsville
City in Boone County, Missouri, United States
| Population | 1,652 |
| Coordinates | 39.1169900, -92.2207400 |
| Altitude | 275 |
| Country | United States |
#2 O'Fallon
The most populous city in St.
| Population | 89,769 |
| Coordinates | 38.8106100, -90.6998500 |
| Altitude | 165 |
| Country | United States |
End: (-90.699849, 38.810674)
Estimated Travel Time
Distance: 159 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 03h 17m |
| 40 mph (64.37 km/h) | 02h 28m |
| 50 mph (80.47 km/h) | 01h 58m |
| 60 mph (96.56 km/h) | 01h 38m |
| 70 mph (112.65 km/h) | 01h 24m |
| 80 mph (129 km/h) | 01h 13m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $13.16 | $26.32 |
| Mid-grade | $4.25 | $14.84 | $29.69 |
| Premium | $4.65 | $16.24 | $32.48 |
| Diesel | $5.30 | $18.51 | $37.02 |
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 · Apr 18, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.