How far is O'Fallon, MO from Eureka, MO?
The driving distance from O'Fallon, MO to Eureka, MO is about 112.2 miles (180.5 km), with a travel time of about 02h 18m by car.
- The straight-line flight distance is about 94 miles (151.3 km).
- For a round trip, plan for roughly 04h 37m 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 02h 18m.
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.
Route Weather Snapshot
Check the forecast at both ends before you head out.
Mostly Sunny then Chance Showers And Thunderstorms
Mostly Sunny then Chance Showers And Thunderstorms
Driving Route Map
The map below follows the saved road route between O'Fallon and Eureka.
Turn-by-Turn Driving Directions
Step-by-step road directions between O'Fallon and Eureka.
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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 Drennen Parkway
1.4 km · 1 min · Drennen Parkway
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4
Take the ramp slight left toward I 70 East: Saint Louis
133 m · 6 sec
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5
Merge slight left
13.5 mi · 17 min
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6
Take the exit slight right toward I 270: Chicago, Memphis
872 ft · 12 sec
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7
Keep slight right to continue on I 270 South: Memphis
2339 ft · 33 sec
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8
Continue on I 270 South: Memphis
723 ft · 10 sec
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9
Merge slight left
19 mi · 24 min
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10
Take the exit slight right toward I 55, US 61, US 67: Saint Louis, Memphis, Lemay Ferry Road
1911 ft · 27 sec
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11
Keep slight right to continue on I 55 South: Memphis
2031 ft · 44 sec
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12
Merge slight left onto Rosa Parks Highway
1.5 mi · 2 min · Rosa Parks Highway
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13
Continue on Officer Thomas G. Smith, Jr. Memorial Highway
1.8 mi · 2 min · Officer Thomas G. Smith, Jr. Memorial Highway
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14
Continue on Police Officer Steven Jarvis Memorial Highway
57.5 mi · 1 hr 2 min · Police Officer Steven Jarvis Memorial Highway
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15
Take the exit slight right toward MO M: Brewer
1069 ft · 29 sec
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16
Turn left
1 km · 2 min
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17
At the end of the road, turn right
5.3 mi · 8 min
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18
Enter the roundabout and take exit 2 toward South Kingshighway Street
41 m · 2 sec · South Kingshighway Street
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19
Exit the roundabout onto South Kingshighway Street
7.1 mi · 11 min · South Kingshighway Street
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20
Turn left
2.5 mi · 6 min
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21
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between O'Fallon and Eureka.
Highway-focused drive
Most of the mileage stays on named highways, so the important moments are ramps, exits, merges, and the final local approach.
Police Officer Steven Jarvis Memorial Highway
Continue on Police Officer Steven Jarvis Memorial Highway
57.5 mi · 01h 02m
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 Chance Showers And Thunderstorms leaving O'Fallon and Mostly Sunny then Chance Showers And Thunderstorms near Eureka.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from O'Fallon to Eureka?
The road trip is about 112.2 miles (180.5 km) and usually takes 02h 18m 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?
Festus is a useful midpoint, sitting about 56.1 miles from O'Fallon and 56.1 miles from Eureka.
How much longer is the road route than the straight-line distance?
The direct path is about 94 miles (151.3 km), while the road route adds roughly 18.2 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 1:52 PM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $14.93 one way or $29.87 round trip. Estimated CO2 is about 35.2 kg one way.
What should you check before leaving?
Before you leave, expect Mostly Sunny then Chance Showers And Thunderstorms around O'Fallon and Mostly Sunny then Chance Showers And Thunderstorms near Eureka.
Stop Ideas Near Festus
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 Festus.
Kirkwood
Gateway Transportation Center
Washington
Alton
Flight Path Map
This map shows the direct air route between O'Fallon and Eureka. Straight-line distance: 94.04 mi (151.34 km).
#1 O'Fallon
The most populous city in St.
| Population | 89,769 |
| Coordinates | 38.8106100, -90.6998500 |
| Altitude | 165 |
| Country | United States |
#2 Eureka
City located in St.
| Population | 11,323 |
| Coordinates | 37.6789400, -89.7370500 |
| Altitude | 195 |
| Country | United States |
End: Eureka (-89.73705, 37.67894)
Estimated Travel Time
Distance: 181 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 03h 44m |
| 40 mph (64.37 km/h) | 02h 48m |
| 50 mph (80.47 km/h) | 02h 14m |
| 60 mph (96.56 km/h) | 01h 52m |
| 70 mph (112.65 km/h) | 01h 36m |
| 80 mph (129 km/h) | 01h 23m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $14.93 | $29.87 |
| Mid-grade | $4.25 | $16.84 | $33.68 |
| Premium | $4.65 | $18.43 | $36.86 |
| Diesel | $5.30 | $21.00 | $42.01 |
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 17, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.