How far is Chesterfield, MO from Saint Peters, MO?
The driving distance from Chesterfield, MO to Saint Peters, MO is about 20.6 miles (33.2 km), with a travel time of about 00h 26m by car.
- The straight-line flight distance is about 9.8 miles (15.8 km).
- For a round trip, plan for roughly 00h 52m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 7:00 AM to 7:00 PM CDT.
Reverse, save, or send this route
This is an easy same-day return drive. Copy the route link, send it to another device, or print a clean version before you head out.
This is an easy same-day return drive.
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 00h 26m.
This is a short drive, so your comfort window is wide. Traffic and current weather matter more than the clock.
This departure sits inside the recommended comfort window for the route.
Halfway Point
A useful midpoint for breaks, coffee, or meeting in the middle.
City in Saint Charles 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 Showers And Thunderstorms Likely
Driving Route Map
The map below follows the saved road route between Chesterfield and Saint Peters.
Turn-by-Turn Driving Directions
Step-by-step road directions between Chesterfield and Saint Peters.
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1
Start on Santa Maria Drive
33 m · 8 sec · Santa Maria Drive
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2
Turn left onto Old Chesterfield Road
751 ft · 33 sec · Old Chesterfield Road
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3
Turn right onto Baxter Road
1596 ft · 46 sec · Baxter Road
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4
At the end of the road, turn left onto Chesterfield Airport Road
1.1 mi · 2 min · Chesterfield Airport Road
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5
Continue on Chesterfield Airport Road
134 m · 8 sec · Chesterfield Airport Road
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6
Turn right onto Boone's Crossing
1015 ft · 27 sec · Boone's Crossing
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7
Take the ramp slight left toward I 64 West, US 40 West, US 61 North
51 m · 7 sec
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8
Turn left onto I 64 West, US 40 West, US 61 North
1219 ft · 17 sec
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9
Merge slight left onto Avenue of the Saints
5 mi · 6 min · Avenue of the Saints
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10
Take the exit slight right toward Research Park Circle
709 ft · 17 sec
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11
Enter the roundabout and take exit 3 toward Technology Drive
67 m · 5 sec · Technology Drive
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12
Exit the roundabout onto Technology Drive
2687 ft · 1 min · Technology Drive
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13
Turn right onto Siedentop Road
1272 ft · 32 sec · Siedentop Road
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14
Turn right
3 mi · 4 min
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15
Keep slight right to continue on Mid Rivers Mall Drive, Pitman Hill Road
1056 ft · 22 sec
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16
Turn left onto Mid Rivers Mall Drive
4.7 mi · 10 min · Mid Rivers Mall Drive
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17
Take the ramp straight toward I 70 West: Wentzville
1419 ft · 20 sec
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18
Merge slight left
146 m · 7 sec
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19
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between Chesterfield and Saint Peters.
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.
Avenue of the Saints
Merge slight left onto Avenue of the Saints
5 mi · 00h 06m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A short regional drive
This route is short enough to handle as a quick errand, commute, or easy same-day return without much planning overhead.
Chance Showers And Thunderstorms leaving Chesterfield and Chance Showers And Thunderstorms then Showers And Thunderstorms Likely near Saint Peters.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Chesterfield to Saint Peters?
The road trip is about 20.6 miles (33.2 km) and usually takes 00h 26m in normal driving conditions.
Is this a same-day trip or an overnight route?
This route is short enough to handle as a quick errand, commute, or easy same-day return without much planning overhead.
What is the halfway point on this route?
Weldon Spring is a useful midpoint, sitting about 8.2 miles from Chesterfield and 12.4 miles from Saint Peters.
How much longer is the road route than the straight-line distance?
The direct path is about 9.8 miles (15.8 km), while the road route adds roughly 10.8 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 7:00 AM to 7:00 PM CDT. If you want a more comfortable same-day return, try to leave by 7:38 PM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $2.75 one way or $5.51 round trip. Estimated CO2 is about 6.5 kg one way.
What should you check before leaving?
Before you leave, expect Chance Showers And Thunderstorms around Chesterfield and Chance Showers And Thunderstorms then Showers And Thunderstorms Likely near Saint Peters.
Stop Ideas Near Weldon Spring
Useful break, food, and waypoint ideas within about 15 miles of the route midpoint.
City Hall Park
City of O'Fallon
Swingley Ridge @ Chesterfield City Hall SB
Transit and Meeting Points
Useful pickup, handoff, or rendezvous points close to Weldon Spring.
Kirkwood
Washington
Gateway Transportation Center
Alton
Flight Path Map
This map shows the direct air route between Chesterfield and Saint Peters. Straight-line distance: 9.85 mi (15.85 km).
#1 Chesterfield
A city in St.
| Population | 47,570 |
| Coordinates | 38.6631100, -90.5770700 |
| Altitude | 144 |
| 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: 33 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 00h 41m |
| 40 mph (64.37 km/h) | 00h 30m |
| 50 mph (80.47 km/h) | 00h 24m |
| 60 mph (96.56 km/h) | 00h 20m |
| 70 mph (112.65 km/h) | 00h 17m |
| 80 mph (129 km/h) | 00h 15m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $2.75 | $5.51 |
| Mid-grade | $4.25 | $3.10 | $6.21 |
| Premium | $4.65 | $3.40 | $6.79 |
| Diesel | $5.30 | $3.87 | $7.74 |
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 16, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.