How far is Dexter, MO from Saint Peters, MO?
The driving distance from Dexter, MO to Saint Peters, MO is about 187.7 miles (302 km), with a travel time of about 02h 47m by car.
- The straight-line flight distance is about 143.2 miles (230.5 km).
- For a round trip, plan for roughly 05h 34m 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 47m.
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 Missouri, United States
Route Weather Snapshot
Check the forecast at both ends before you head out.
Mostly Sunny
Mostly Sunny
Driving Route Map
The map below follows the saved road route between Dexter and Saint Peters.
Turn-by-Turn Driving Directions
Step-by-step road directions between Dexter and Saint Peters.
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1
Start on North Walnut Street
1341 ft · 39 sec · North Walnut Street
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2
At the end of the road, turn right
2184 ft · 50 sec
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3
At the end of the road, turn left
1.3 mi · 2 min
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4
Take the ramp slight right
16.1 mi · 19 min
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5
Continue straight
7.1 mi · 8 min
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6
Take the exit slight right toward I 55 North: Saint Louis
1793 ft · 44 sec
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7
Merge slight left
27.4 mi · 29 min
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8
Keep slight left
101.5 mi · 1 hr 49 min
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9
Continue on Rosa Parks Highway
1.3 mi · 2 min · Rosa Parks Highway
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10
Take the exit slight right toward I 270 West, I 255 East: Kansas City, Chicago
1279 ft · 27 sec
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11
Keep slight left to continue on I 270 West: Kansas City
118 m · 8 sec
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12
Continue on I 270 West
1.2 km · 1 min
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13
Merge slight left
18.1 mi · 23 min
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14
Take the exit slight right toward I 70: Kansas City, Saint Louis, Saint Louis Lambert International Airport
1 mi · 1 min
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15
Keep slight left to continue on I 70 West: Kansas City
645 ft · 11 sec
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16
Continue on I 70 West: Kansas City
1 km · 57 sec
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17
Merge slight left
10.5 mi · 13 min
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18
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between Dexter and Saint Peters.
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 55 North
Keep slight left
102 mi · 01h 49m
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 leaving Dexter and Mostly Sunny near Saint Peters.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Dexter to Saint Peters?
The road trip is about 187.7 miles (302 km) and usually takes 02h 47m 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?
Perryville is a useful midpoint, sitting about 93.7 miles from Dexter and 94 miles from Saint Peters.
How much longer is the road route than the straight-line distance?
The direct path is about 143.2 miles (230.5 km), while the road route adds roughly 44.5 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 12:56 PM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $24.96 one way or $49.93 round trip. Estimated CO2 is about 58.8 kg one way.
What should you check before leaving?
Before you leave, expect Mostly Sunny around Dexter and Mostly Sunny near Saint Peters.
Stop Ideas Near Perryville
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 Perryville.
Carbondale station
Du Quoin
Marion, IL
Vienna, IL
Flight Path Map
This map shows the direct air route between Dexter and Saint Peters. Straight-line distance: 143.22 mi (230.49 km).
#1 Dexter
City in Stoddard County, Missouri, United States
| Population | 7,839 |
| Coordinates | 36.7958900, -89.9578700 |
| Altitude | 113 |
| Country | United States |
#2 Saint Peters
The most populous city in St.
| Population | 58,043 |
| Coordinates | 38.8003300, -90.6265100 |
| Altitude | 134 |
| Country | United States |
End: I 70 West (-90.626511, 38.800311)
Estimated Travel Time
Distance: 302 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 06h 15m |
| 40 mph (64.37 km/h) | 04h 41m |
| 50 mph (80.47 km/h) | 03h 45m |
| 60 mph (96.56 km/h) | 03h 07m |
| 70 mph (112.65 km/h) | 02h 40m |
| 80 mph (129 km/h) | 02h 20m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $24.96 | $49.93 |
| Mid-grade | $4.25 | $28.15 | $56.31 |
| Premium | $4.65 | $30.81 | $61.62 |
| Diesel | $5.30 | $35.11 | $70.22 |
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 23, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.