How far is Saint Charles, MO from Affton, MO?
The driving distance from Saint Charles, MO to Affton, MO is about 25.1 miles (40.4 km), with a travel time of about 00h 37m by car.
- The straight-line flight distance is about 18 miles (29 km).
- For a round trip, plan for roughly 01h 14m 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 37m.
This is a short drive, so your comfort window is wide. Traffic and current weather matter more than the clock.
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.
Human settlement in St.
Route Weather Snapshot
Check the forecast at both ends before you head out.
Driving Route Map
The map below follows the saved road route between Saint Charles and Affton.
Turn-by-Turn Driving Directions
Step-by-step road directions between Saint Charles and Affton.
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1
Start on North Second Street
949 ft · 38 sec · North Second Street
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2
Turn right onto Jefferson Street
1093 ft · 45 sec · Jefferson Street
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3
Turn left onto South Fifth Street
1.1 mi · 3 min · South Fifth Street
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4
Take the ramp slight left toward I 70 East
1019 ft · 14 sec
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5
Merge slight left
2.7 mi · 3 min
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6
Take the exit slight right toward I 270: Chicago, Memphis
872 ft · 12 sec
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7
Keep slight right to continue on I 270 South: Memphis
2339 ft · 33 sec
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8
Continue on I 270 South: Memphis
723 ft · 10 sec
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9
Merge slight left
15.6 mi · 19 min
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10
Take the exit slight right toward MO 30: Gravois Road
1580 ft · 34 sec
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11
Keep slight left to continue on MO 30: Saint Louis, Ulysses S. Grant National Historic Site, Gravois Road
121 m · 11 sec
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12
Merge slight right
4.1 mi · 8 min
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13
Turn right
12 m · 8 sec
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14
Turn left
27 m · 6 sec
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15
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between Saint Charles and Affton.
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.
I 270 South
Merge slight left
15.6 mi · 00h 19m
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.
Sunny leaving Saint Charles and Sunny near Affton.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Saint Charles to Affton?
The road trip is about 25.1 miles (40.4 km) and usually takes 00h 37m 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?
Country Life Acres is a useful midpoint, sitting about 12.6 miles from Saint Charles and 12.6 miles from Affton.
How much longer is the road route than the straight-line distance?
The direct path is about 18 miles (29 km), while the road route adds roughly 7.1 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 7:00 AM to 7:00 PM CDT. If you want a more comfortable same-day return, try to leave by 7:16 PM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $3.36 one way or $6.71 round trip. Estimated CO2 is about 7.9 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around Saint Charles and Sunny near Affton.
Stop Ideas Near Country Life Acres
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 Country Life Acres.
Kirkwood
Gateway Transportation Center
Alton
Washington
Flight Path Map
This map shows the direct air route between Saint Charles and Affton. Straight-line distance: 17.99 mi (28.95 km).
#1 Saint Charles
A city in St.
| Population | 71,761 |
| Coordinates | 38.7839400, -90.4812300 |
| Altitude | 147 |
| Country | United States |
#2 Affton
Census designated place
| Population | 20,307 |
| Coordinates | 38.5506100, -90.3331700 |
| Altitude | 188 |
| Country | United States |
End: Affton (-90.33317, 38.55061)
Estimated Travel Time
Distance: 40 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 00h 50m |
| 40 mph (64.37 km/h) | 00h 37m |
| 50 mph (80.47 km/h) | 00h 30m |
| 60 mph (96.56 km/h) | 00h 25m |
| 70 mph (112.65 km/h) | 00h 21m |
| 80 mph (129 km/h) | 00h 18m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $3.36 | $6.71 |
| Mid-grade | $4.25 | $3.79 | $7.57 |
| Premium | $4.65 | $4.14 | $8.28 |
| Diesel | $5.30 | $4.72 | $9.44 |
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 19, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.