How far is Washington County, MO from Chesterfield, MO?
The driving distance from Washington County, MO to Chesterfield, MO is about 79.4 miles (127.8 km), with a travel time of about 01h 36m by car.
- The straight-line flight distance is about 51.1 miles (82.3 km).
- For a round trip, plan for roughly 03h 12m 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 36m.
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.
Showers And Thunderstorms
Showers And Thunderstorms
Driving Route Map
The map below follows the saved road route between Washington County and Chesterfield.
Turn-by-Turn Driving Directions
Step-by-step road directions between Washington County and Chesterfield.
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1
Start on the route
2765 ft · 2 min
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2
Turn right
3.8 mi · 9 min
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3
Turn right
1.4 mi · 3 min
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4
Turn straight onto West High Street
1.5 mi · 2 min · West High Street
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5
Turn left
25.5 mi · 41 min
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6
Continue straight
3.8 mi · 5 min
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7
Turn left
1894 ft · 36 sec
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8
Continue on MO 21 North: Saint Louis
19.7 mi · 23 min
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9
Take the exit slight right toward MO 141: Arnold, Fenton
1384 ft · 24 sec
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10
Turn left
4 mi · 6 min
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11
Keep slight left to continue on MO 141
11.3 mi · 18 min · MO 141
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12
Take the exit slight left toward I 64 West, US 40 West, US 61 North: Wentzville
41 m · 7 sec
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13
Turn left onto I 64 West, US 40 West, US 61 North: Wentzville
1812 ft · 44 sec
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14
Merge slight left onto Avenue of the Saints
2.6 mi · 3 min · Avenue of the Saints
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15
Take the exit slight right toward Chesterfield Parkway West
116 m · 8 sec
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16
Turn straight onto North Outer 40
2036 ft · 56 sec · North Outer 40
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17
Turn left onto Chesterfield Parkway West
607 ft · 27 sec · Chesterfield Parkway West
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18
Turn right
1674 ft · 33 sec
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19
Turn straight onto Wild Horse Creek Road
48 m · 4 sec · Wild Horse Creek Road
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20
Turn right onto Old Chesterfield Road
1576 ft · 1 min · Old Chesterfield Road
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21
Turn left onto Santa Maria Drive
33 m · 5 sec · Santa Maria Drive
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22
Arrive at your destination
0 m · 1 sec · Santa Maria Drive
Car Route Details
A richer read on the saved driving route between Washington County and Chesterfield.
Straightforward drive
The saved road route has a manageable number of maneuvers and should be easy to follow with normal attention to signs.
Longest stretch
Turn left
25.5 mi · 00h 41m
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.
Showers And Thunderstorms leaving Washington County and Showers And Thunderstorms near Chesterfield.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Washington County to Chesterfield?
The road trip is about 79.4 miles (127.8 km) and usually takes 01h 36m 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?
Hillsboro is a useful midpoint, sitting about 38.2 miles from Washington County and 41.3 miles from Chesterfield.
How much longer is the road route than the straight-line distance?
The direct path is about 51.1 miles (82.3 km), while the road route adds roughly 28.3 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 3:18 PM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $11.13 one way or $22.26 round trip. Estimated CO2 is about 24.9 kg one way.
What should you check before leaving?
Before you leave, expect Showers And Thunderstorms around Washington County and Showers And Thunderstorms near Chesterfield.
Stop Ideas Near Hillsboro
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 Hillsboro.
Kirkwood
Washington
Gateway Transportation Center
Alton
Flight Path Map
This map shows the direct air route between Washington County and Chesterfield. Straight-line distance: 51.13 mi (82.28 km).
#1 Washington County
County in Missouri, United States
| Population | 24,604 |
| Coordinates | 37.9616800, -90.8774200 |
| Altitude | 292 |
| Country | United States |
#2 Chesterfield
A city in St.
| Population | 47,570 |
| Coordinates | 38.6631100, -90.5770700 |
| Altitude | 144 |
| Country | United States |
End: Santa Maria Drive (-90.576914, 38.663102)
Estimated Travel Time
Distance: 128 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 02h 38m |
| 40 mph (64.37 km/h) | 01h 59m |
| 50 mph (80.47 km/h) | 01h 35m |
| 60 mph (96.56 km/h) | 01h 19m |
| 70 mph (112.65 km/h) | 01h 08m |
| 80 mph (129 km/h) | 00h 59m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.98 | $11.13 | $22.26 |
| Mid-grade | $4.34 | $12.15 | $24.31 |
| Premium | $4.71 | $13.18 | $26.36 |
| Diesel | $5.99 | $16.77 | $33.53 |
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 · Oct 15, 2026