How far is Mexico, MO from O'Fallon, MO?
The driving distance from Mexico, MO to O'Fallon, MO is about 87.9 miles (141.4 km), with a travel time of about 01h 23m by car.
- The straight-line flight distance is about 68.2 miles (109.8 km).
- For a round trip, plan for roughly 02h 46m 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 23m.
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.
Isolated Rain Showers
Chance Rain Showers
Driving Route Map
The map below follows the saved road route between Mexico and O'Fallon.
Turn-by-Turn Driving Directions
Step-by-step road directions between Mexico and O'Fallon.
-
1
Start on South Jefferson Street
51 m · 8 sec · South Jefferson Street
-
2
Turn right onto High Street
677 ft · 34 sec · High Street
-
3
Turn left onto South Clark Street
3.6 mi · 6 min · South Clark Street
-
4
Take the ramp right toward US 54 West: Jefferson City
1180 ft · 32 sec
-
5
Merge slight left
13.5 mi · 15 min
-
6
Take the exit left toward I 70 East, US 40 East: Saint Louis
1318 ft · 18 sec
-
7
Merge slight left onto Dwight D. Eisenhower Highway
69.2 mi · 1 hr 20 min · Dwight D. Eisenhower Highway
-
8
Take the exit slight right toward MO K: O'Fallon
1765 ft · 43 sec
-
9
Turn straight onto Drennen Parkway
46 m · 3 sec · Drennen Parkway
-
10
Keep slight right to continue on Drennen Parkway
51 m · 6 sec · Drennen Parkway
-
11
Turn slight left onto MO K: O'Fallon
19 m · 3 sec
-
12
Continue on South Main Street
3115 ft · 2 min · South Main Street
-
13
Turn right
8 m · 2 sec
-
14
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between Mexico 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
Merge slight left onto Dwight D. Eisenhower Highway
69.2 mi · 01h 20m
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.
Isolated Rain Showers leaving Mexico and Chance Rain Showers near O'Fallon.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Mexico to O'Fallon?
The road trip is about 87.9 miles (141.4 km) and usually takes 01h 23m 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?
New Florence is a useful midpoint, sitting about 43.9 miles from Mexico and 44 miles from O'Fallon.
How much longer is the road route than the straight-line distance?
The direct path is about 68.2 miles (109.8 km), while the road route adds roughly 19.7 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 3:44 PM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $11.69 one way or $23.38 round trip. Estimated CO2 is about 27.5 kg one way.
What should you check before leaving?
Before you leave, expect Isolated Rain Showers around Mexico and Chance Rain Showers near O'Fallon.
Stop Ideas Near New Florence
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 New Florence.
Hermann
Washington
Jefferson City
Kirkwood
Flight Path Map
This map shows the direct air route between Mexico and O'Fallon. Straight-line distance: 68.21 mi (109.77 km).
#1 Mexico
City in and county seat of Audrain County, Missouri
| Population | 11,530 |
| Coordinates | 39.1697600, -91.8829500 |
| Altitude | 244 |
| 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: 141 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 02h 55m |
| 40 mph (64.37 km/h) | 02h 11m |
| 50 mph (80.47 km/h) | 01h 45m |
| 60 mph (96.56 km/h) | 01h 27m |
| 70 mph (112.65 km/h) | 01h 15m |
| 80 mph (129 km/h) | 01h 05m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $11.69 | $23.38 |
| Mid-grade | $4.25 | $13.18 | $26.37 |
| Premium | $4.65 | $14.43 | $28.85 |
| Diesel | $5.30 | $16.44 | $32.88 |
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 16, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.