How far is Saint Peters, MO from Saint Clair, MO?
The driving distance from Saint Peters, MO to Saint Clair, MO is about 51 miles (82.1 km), with a travel time of about 01h 13m by car.
- The straight-line flight distance is about 36.8 miles (59.2 km).
- For a round trip, plan for roughly 02h 27m 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 13m.
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.
Township in Harrison County, Missouri, United States
Route Weather Snapshot
Check the forecast at both ends before you head out.
Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms
Slight Chance Rain Showers
Driving Route Map
The map below follows the saved road route between Saint Peters and Saint Clair.
Turn-by-Turn Driving Directions
Step-by-step road directions between Saint Peters and Saint Clair.
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1
Start on the route
3 mi · 4 min
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2
Take the exit slight right toward MO K: O'Fallon, Main Street
119 m · 8 sec
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3
Turn straight onto East Terra Lane
1.4 km · 2 min · East Terra Lane
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4
Turn slight left
19 m · 2 sec
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5
Continue straight
3.1 mi · 6 min
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6
Continue straight
3.4 mi · 5 min
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7
Take the ramp slight right toward I 64 East, US 40 East, US 61 South
1523 ft · 22 sec
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8
Merge slight left onto Avenue of the Saints
3.7 mi · 5 min · Avenue of the Saints
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9
Take the exit slight right toward Chesterfield Airport Road
2700 ft · 58 sec
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10
Continue on Chesterfield Airport Road
110 m · 7 sec · Chesterfield Airport Road
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11
Turn right onto Olive Street Road
64 m · 5 sec
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12
Turn right onto Olive Street Road
1.5 km · 2 min · Olive Street Road
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13
Continue on North Eatherton Road
2.4 mi · 5 min · North Eatherton Road
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14
Enter the roundabout and take exit 2 toward the route
21 m · 1 sec
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15
Exit the roundabout
4.3 mi · 7 min
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16
Enter the roundabout and take exit 2 toward the route
29 m · 2 sec
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17
Exit the roundabout
2098 ft · 45 sec
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18
Enter the roundabout and take exit 2 toward MO 100 West: Gray Summit
23 m · 2 sec
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19
Exit the roundabout onto MO 100 West: Gray Summit
1202 ft · 33 sec
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20
Merge slight left
13.3 mi · 19 min
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21
Take the exit slight right toward I 44 West, US 50 West: St. Clair
1157 ft · 14 sec
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22
Merge slight left
12.5 mi · 13 min
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23
Take the exit slight right toward MO 47: Saint Clair, Union
1625 ft · 44 sec
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24
Turn left onto North Main Street
1.3 mi · 3 min · North Main Street
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25
Arrive at your destination
0 m · 1 sec · South Main Street
Car Route Details
A richer read on the saved driving route between Saint Peters and Saint Clair.
Turn-heavy local drive
The route has frequent decision points for its length, so lane choice and turn timing will matter more than cruising speed.
MO 100 West
Merge slight left
13.3 mi · 00h 19m
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.
Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms leaving Saint Peters and Slight Chance Rain Showers near Saint Clair.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Saint Peters to Saint Clair?
The road trip is about 51 miles (82.1 km) and usually takes 01h 13m 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?
Fox Creek is a useful midpoint, sitting about 25.5 miles from Saint Peters and 25.5 miles from Saint Clair.
How much longer is the road route than the straight-line distance?
The direct path is about 36.8 miles (59.2 km), while the road route adds roughly 14.2 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 4:02 PM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $6.79 one way or $13.58 round trip. Estimated CO2 is about 16 kg one way.
What should you check before leaving?
Before you leave, expect Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms around Saint Peters and Slight Chance Rain Showers near Saint Clair.
Stop Ideas Near Fox Creek
Useful break, food, and waypoint ideas within about 15 miles of the route midpoint.
City Hall Park
Wildwood City Hall
Swingley Ridge @ Chesterfield City Hall SB
Transit and Meeting Points
Useful pickup, handoff, or rendezvous points close to Fox Creek.
Kirkwood
Washington
Gateway Transportation Center
Alton
Flight Path Map
This map shows the direct air route between Saint Peters and Saint Clair. Straight-line distance: 36.81 mi (59.24 km).
#1 Saint Peters
The most populous city in St.
| Population | 58,043 |
| Coordinates | 38.8003300, -90.6265100 |
| Altitude | 134 |
| Country | United States |
#2 Saint Clair
City in Franklin County, Missouri, United States
| Population | 4,689 |
| Coordinates | 38.3453300, -90.9809700 |
| Altitude | 234 |
| Country | United States |
End: Saint Clair (-90.98097, 38.34533)
Estimated Travel Time
Distance: 82 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 01h 41m |
| 40 mph (64.37 km/h) | 01h 16m |
| 50 mph (80.47 km/h) | 01h 01m |
| 60 mph (96.56 km/h) | 00h 50m |
| 70 mph (112.65 km/h) | 00h 43m |
| 80 mph (129 km/h) | 00h 38m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $6.79 | $13.58 |
| Mid-grade | $4.25 | $7.66 | $15.31 |
| Premium | $4.65 | $8.38 | $16.75 |
| Diesel | $5.30 | $9.55 | $19.09 |
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 30, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.