How far is O'Fallon, MO from Riverside, MO?
The driving distance from O'Fallon, MO to Riverside, MO is about 53.1 miles (85.4 km), with a travel time of about 01h 08m by car.
- The straight-line flight distance is about 40.1 miles (64.5 km).
- For a round trip, plan for roughly 02h 17m 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 08m.
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 Saint Louis County, Missouri, United States
Route Weather Snapshot
Check the forecast at both ends before you head out.
Isolated Showers And Thunderstorms then Chance Showers And Thunderstorms
Isolated Showers And Thunderstorms then Scattered Showers And Thunderstorms
Driving Route Map
The map below follows the saved road route between O'Fallon and Riverside.
Turn-by-Turn Driving Directions
Step-by-step road directions between O'Fallon and Riverside.
-
1
Start on the route
8 m · 7 sec
-
2
Turn left onto South Main Street
3116 ft · 2 min · South Main Street
-
3
Turn left onto Drennen Parkway
1.4 km · 1 min · Drennen Parkway
-
4
Take the ramp slight left toward I 70 East: Saint Louis
133 m · 6 sec
-
5
Merge slight left
13.5 mi · 17 min
-
6
Take the exit slight right toward I 270: Chicago, Memphis
872 ft · 12 sec
-
7
Keep slight right to continue on I 270 South: Memphis
2339 ft · 33 sec
-
8
Continue on I 270 South: Memphis
723 ft · 10 sec
-
9
Merge slight left
19 mi · 24 min
-
10
Take the exit slight right toward I 55, US 61, US 67: Saint Louis, Memphis, Lemay Ferry Road
1911 ft · 27 sec
-
11
Keep slight right to continue on I 55 South: Memphis
2031 ft · 44 sec
-
12
Merge slight left onto Rosa Parks Highway
1.5 mi · 2 min · Rosa Parks Highway
-
13
Continue on Officer Thomas G. Smith, Jr. Memorial Highway
1.8 mi · 2 min · Officer Thomas G. Smith, Jr. Memorial Highway
-
14
Continue on Police Officer Steven Jarvis Memorial Highway
12 mi · 13 min · Police Officer Steven Jarvis Memorial Highway
-
15
Take the exit slight right toward MO Z: Pevely
1544 ft · 41 sec
-
16
Turn left
2864 ft · 1 min
-
17
Turn right onto Commercial Boulevard
3270 ft · 1 min · Commercial Boulevard
-
18
Turn left onto Dow Industrial Drive
2904 ft · 2 min · Dow Industrial Drive
-
19
At the end of the road, turn right onto Riverside Drive
666 ft · 29 sec · Riverside Drive
-
20
Arrive at your destination
0 m · 1 sec · River
Car Route Details
A richer read on the saved driving route between O'Fallon and Riverside.
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 270 South
Merge slight left
19 mi · 00h 24m
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 Showers And Thunderstorms then Chance Showers And Thunderstorms leaving O'Fallon and Isolated Showers And Thunderstorms then Scattered Showers And Thunderstorms near Riverside.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from O'Fallon to Riverside?
The road trip is about 53.1 miles (85.4 km) and usually takes 01h 08m 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?
Des Peres is a useful midpoint, sitting about 26.5 miles from O'Fallon and 26.5 miles from Riverside.
How much longer is the road route than the straight-line distance?
The direct path is about 40.1 miles (64.5 km), while the road route adds roughly 13 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 4:12 PM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $7.05 one way or $14.10 round trip. Estimated CO2 is about 16.6 kg one way.
What should you check before leaving?
Before you leave, expect Isolated Showers And Thunderstorms then Chance Showers And Thunderstorms around O'Fallon and Isolated Showers And Thunderstorms then Scattered Showers And Thunderstorms near Riverside.
Stop Ideas Near Des Peres
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 Des Peres.
Kirkwood
Gateway Transportation Center
Alton
Washington
Flight Path Map
This map shows the direct air route between O'Fallon and Riverside. Straight-line distance: 40.11 mi (64.55 km).
#1 O'Fallon
The most populous city in St.
| Population | 89,769 |
| Coordinates | 38.8106100, -90.6998500 |
| Altitude | 165 |
| Country | United States |
#2 Riverside
City in Platte County, Missouri, United States
| Population | 3,528 |
| Coordinates | 38.2867200, -90.3801200 |
| Altitude | 129 |
| Country | United States |
End: Riverside (-90.38012, 38.28672)
Estimated Travel Time
Distance: 85 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 01h 46m |
| 40 mph (64.37 km/h) | 01h 19m |
| 50 mph (80.47 km/h) | 01h 03m |
| 60 mph (96.56 km/h) | 00h 53m |
| 70 mph (112.65 km/h) | 00h 45m |
| 80 mph (129 km/h) | 00h 39m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $7.05 | $14.10 |
| Mid-grade | $4.25 | $7.95 | $15.91 |
| Premium | $4.65 | $8.70 | $17.41 |
| Diesel | $5.30 | $9.92 | $19.84 |
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 · May 31, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.