How far is Saint Peters, MO from Mount Vernon, MO?
The driving distance from Saint Peters, MO to Mount Vernon, MO is about 244.8 miles (393.9 km), with a travel time of about 04h 43m by car.
- The straight-line flight distance is about 209.7 miles (337.5 km).
- For a round trip, plan for roughly 09h 26m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 6:00 AM to 8:00 AM CDT.
Reverse, save, or send this route
This drive is better planned with a longer stop or an overnight stay. Copy the route link, send it to another device, or print a clean version before you head out.
This drive is better planned with a longer stop or an overnight stay.
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 04h 43m.
An early departure helps you fit a real stop into the day without turning the return into a late-night drive.
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 Pulaski County, Missouri, United States
Route Weather Snapshot
Check the forecast at both ends before you head out.
Chance Showers And Thunderstorms
Chance Showers And Thunderstorms then Mostly Sunny
Driving Route Map
The map below follows the saved road route between Saint Peters and Mount Vernon.
Turn-by-Turn Driving Directions
Step-by-step road directions between Saint Peters and Mount Vernon.
-
1
Start on the route
3 mi · 4 min
-
2
Take the exit slight right toward MO K: O'Fallon, Main Street
119 m · 8 sec
-
3
Turn straight onto East Terra Lane
1.4 km · 2 min · East Terra Lane
-
4
Turn slight left
19 m · 2 sec
-
5
Continue straight
3.1 mi · 6 min
-
6
Continue straight
3.4 mi · 5 min
-
7
Take the ramp slight right toward I 64 East, US 40 East, US 61 South
1523 ft · 22 sec
-
8
Merge slight left onto Avenue of the Saints
3.7 mi · 5 min · Avenue of the Saints
-
9
Take the exit slight right toward Chesterfield Airport Road
2700 ft · 58 sec
-
10
Continue on Chesterfield Airport Road
110 m · 7 sec · Chesterfield Airport Road
-
11
Turn right onto Olive Street Road
64 m · 5 sec
-
12
Turn right onto Olive Street Road
1.5 km · 2 min · Olive Street Road
-
13
Continue on North Eatherton Road
2.4 mi · 5 min · North Eatherton Road
-
14
Enter the roundabout and take exit 2 toward the route
21 m · 1 sec
-
15
Exit the roundabout
4.3 mi · 7 min
-
16
Enter the roundabout and take exit 2 toward the route
29 m · 2 sec
-
17
Exit the roundabout
2098 ft · 45 sec
-
18
Enter the roundabout and take exit 2 toward MO 100 West: Gray Summit
23 m · 2 sec
-
19
Exit the roundabout onto MO 100 West: Gray Summit
1202 ft · 33 sec
-
20
Merge slight left
13.3 mi · 19 min
-
21
Take the exit slight right toward I 44 West, US 50 West: St. Clair
1157 ft · 14 sec
-
22
Merge slight left
206.1 mi · 3 hr 43 min
-
23
Take the exit slight right toward MO 39, MO 265, I 44 Business: Aurora, Mount Vernon
1208 ft · 32 sec
-
24
Turn right onto East Mount Vernon Boulevard
1.3 km · 1 min · East Mount Vernon Boulevard
-
25
Turn slight right
43 m · 5 sec
-
26
Turn slight right onto South Market Street
3049 ft · 1 min · South Market Street
-
27
Turn left onto West Dallas Street
49 m · 9 sec · West Dallas Street
-
28
Turn right
52 m · 15 sec
-
29
Turn right onto West Center Street
50 m · 7 sec · West Center Street
-
30
Turn slight right
8 m · 9 sec
-
31
Turn sharp left
73 m · 18 sec
-
32
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between Saint Peters and Mount Vernon.
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 44 West
Merge slight left
206 mi · 03h 43m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A longer out-and-back drive
This is still possible in one day, but it becomes a long driving day. Leaving early and planning your stop window matters more here.
Chance Showers And Thunderstorms leaving Saint Peters and Chance Showers And Thunderstorms then Mostly Sunny near Mount Vernon.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Saint Peters to Mount Vernon?
The road trip is about 244.8 miles (393.9 km) and usually takes 04h 43m in normal driving conditions.
Is this a same-day trip or an overnight route?
This is still possible in one day, but it becomes a long driving day. Leaving early and planning your stop window matters more here.
What is the halfway point on this route?
Saint Robert is a useful midpoint, sitting about 122.3 miles from Saint Peters and 122.5 miles from Mount Vernon.
How much longer is the road route than the straight-line distance?
The direct path is about 209.7 miles (337.5 km), while the road route adds roughly 35.1 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 6:00 AM to 8:00 AM CDT. If you want a more comfortable same-day return, try to leave by 7:34 AM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $32.58 one way or $65.16 round trip. Estimated CO2 is about 76.8 kg one way.
What should you check before leaving?
Before you leave, expect Chance Showers And Thunderstorms around Saint Peters and Chance Showers And Thunderstorms then Mostly Sunny near Mount Vernon.
Stop Ideas Near Saint Robert
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 Saint Robert.
Jefferson City
Hermann
Flight Path Map
This map shows the direct air route between Saint Peters and Mount Vernon. Straight-line distance: 209.71 mi (337.49 km).
#1 Saint Peters
The most populous city in St.
| Population | 58,043 |
| Coordinates | 38.8003300, -90.6265100 |
| Altitude | 134 |
| Country | United States |
#2 Mount Vernon
City in Missouri
| Population | 4,477 |
| Coordinates | 37.1036700, -93.8185400 |
| Altitude | 369 |
| Country | United States |
End: Mount Vernon (-93.81854, 37.10367)
Estimated Travel Time
Distance: 394 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 08h 09m |
| 40 mph (64.37 km/h) | 06h 07m |
| 50 mph (80.47 km/h) | 04h 53m |
| 60 mph (96.56 km/h) | 04h 04m |
| 70 mph (112.65 km/h) | 03h 29m |
| 80 mph (129 km/h) | 03h 03m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $32.58 | $65.16 |
| Mid-grade | $4.25 | $36.75 | $73.49 |
| Premium | $4.65 | $40.21 | $80.42 |
| Diesel | $5.30 | $45.83 | $91.65 |
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.