How far is O'Fallon, MO from Salem, MO?
The driving distance from O'Fallon, MO to Salem, MO is about 118.9 miles (191.3 km), with a travel time of about 02h 42m by car.
- The straight-line flight distance is about 92.4 miles (148.7 km).
- For a round trip, plan for roughly 05h 24m 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 42m.
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.
Human settlement in Franklin County, Missouri, United States of America
Route Weather Snapshot
Check the forecast at both ends before you head out.
Driving Route Map
The map below follows the saved road route between O'Fallon and Salem.
Turn-by-Turn Driving Directions
Step-by-step road directions between O'Fallon and Salem.
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1
Start on the route
8 m · 7 sec
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2
Turn left onto South Main Street
2865 ft · 1 min · South Main Street
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3
Continue straight
3.1 mi · 6 min
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4
Continue straight
3.4 mi · 5 min
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5
Take the ramp slight right toward I 64 East, US 40 East, US 61 South
1523 ft · 22 sec
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6
Merge slight left onto Avenue of the Saints
3.7 mi · 5 min · Avenue of the Saints
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7
Take the exit slight right toward Chesterfield Airport Road
2700 ft · 58 sec
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8
Continue on Chesterfield Airport Road
110 m · 7 sec · Chesterfield Airport Road
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9
Turn right onto Olive Street Road
64 m · 5 sec
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10
Turn right onto Olive Street Road
1.5 km · 2 min · Olive Street Road
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11
Continue on North Eatherton Road
2.4 mi · 5 min · North Eatherton Road
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12
Enter the roundabout and take exit 2 toward the route
21 m · 1 sec
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13
Exit the roundabout
4.3 mi · 7 min
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14
Enter the roundabout and take exit 2 toward the route
29 m · 2 sec
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15
Exit the roundabout
2098 ft · 45 sec
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16
Enter the roundabout and take exit 2 toward MO 100 West: Gray Summit
23 m · 2 sec
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17
Exit the roundabout onto MO 100 West: Gray Summit
1202 ft · 33 sec
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18
Merge slight left
13.3 mi · 19 min
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19
Take the exit slight right toward I 44 West, US 50 West: St. Clair
1157 ft · 14 sec
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20
Merge slight left
57.4 mi · 1 hr 1 min
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21
Take the exit slight right toward MO 8, MO 68: Saint James
710 ft · 18 sec
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22
Turn left onto North Jefferson Street
4.8 mi · 7 min · North Jefferson Street
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23
Turn right
22.3 mi · 39 min
-
24
Continue straight
1.3 km · 1 min
-
25
Turn left onto East 4th Street
29 m · 3 sec · East 4th Street
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26
Arrive at your destination
0 m · 1 sec · East 4th Street
Car Route Details
A richer read on the saved driving route between O'Fallon and Salem.
Interchange-aware route
The drive includes several ramps, exits, or merges, so checking the next few maneuvers before busy interchanges is useful.
I 44 West
Merge slight left
57.4 mi · 01h 01m
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.
Sunny leaving O'Fallon and Sunny near Salem.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from O'Fallon to Salem?
The road trip is about 118.9 miles (191.3 km) and usually takes 02h 42m 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?
Oak Grove Village is a useful midpoint, sitting about 59.5 miles from O'Fallon and 59.5 miles from Salem.
How much longer is the road route than the straight-line distance?
The direct path is about 92.4 miles (148.7 km), while the road route adds roughly 26.5 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 1:06 PM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $15.84 one way or $31.68 round trip. Estimated CO2 is about 37.3 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around O'Fallon and Sunny near Salem.
Stop Ideas Near Oak Grove Village
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 Oak Grove Village.
Washington
Hermann
Kirkwood
Gateway Transportation Center
Flight Path Map
This map shows the direct air route between O'Fallon and Salem. Straight-line distance: 92.4 mi (148.71 km).
#1 O'Fallon
The most populous city in St.
| Population | 89,769 |
| Coordinates | 38.8106100, -90.6998500 |
| Altitude | 165 |
| Country | United States |
#2 Salem
City in Missouri, United States
| Population | 4,874 |
| Coordinates | 37.6456000, -91.5359800 |
| Altitude | 361 |
| Country | United States |
End: Salem (-91.53598, 37.6456)
Estimated Travel Time
Distance: 191 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 03h 57m |
| 40 mph (64.37 km/h) | 02h 58m |
| 50 mph (80.47 km/h) | 02h 22m |
| 60 mph (96.56 km/h) | 01h 58m |
| 70 mph (112.65 km/h) | 01h 41m |
| 80 mph (129 km/h) | 01h 28m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $15.84 | $31.68 |
| Mid-grade | $4.25 | $17.86 | $35.73 |
| Premium | $4.65 | $19.55 | $39.09 |
| Diesel | $5.30 | $22.28 | $44.55 |
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 13, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.