How far is St. Louis, MO from Affton, MO?
The driving distance from St. Louis, MO to Affton, MO is about 10.9 miles (17.5 km), with a travel time of about 00h 19m by car.
- The straight-line flight distance is about 9 miles (14.5 km).
- For a round trip, plan for roughly 00h 38m 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 19m.
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.
City in Missouri, United States
Route Weather Snapshot
Check the forecast at both ends before you head out.
Chance Showers And Thunderstorms
Partly Sunny then Chance Showers And Thunderstorms
Driving Route Map
The map below follows the saved road route between St. Louis and Affton.
Turn-by-Turn Driving Directions
Step-by-step road directions between St. Louis and Affton.
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1
Start on Market Street
26 m · 4 sec · Market Street
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2
Turn left onto South Tucker Boulevard
1.3 mi · 4 min · South Tucker Boulevard
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3
Turn straight onto Gravois Avenue
1619 ft · 46 sec · Gravois Avenue
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4
Take the ramp left toward I 55 South: Memphis
626 ft · 15 sec
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5
Merge slight left
6.4 mi · 8 min
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6
Take the exit slight right toward Bayless Avenue
635 ft · 18 sec
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7
Keep slight right to continue on Bayless Avenue
54 m · 5 sec
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8
Turn straight onto Bayless Avenue
845 ft · 23 sec · Bayless Avenue
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9
Continue on Weber Road
1.3 mi · 3 min · Weber Road
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10
Turn left onto Gravois Road
1 mi · 2 min · Gravois Road
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11
Turn left onto Tesson Ferry Road
72 m · 15 sec · Tesson Ferry Road
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12
Turn right
69 m · 17 sec
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13
Turn slight right
20 m · 5 sec
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14
Turn right
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 St. Louis 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 55 South
Merge slight left
6.38 mi · 00h 08m
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 St. Louis and Partly Sunny then Chance Showers And Thunderstorms near Affton.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from St. Louis to Affton?
The road trip is about 10.9 miles (17.5 km) and usually takes 00h 19m 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?
Bella Villa is a useful midpoint, sitting about 5.5 miles from St. Louis and 5.5 miles from Affton.
How much longer is the road route than the straight-line distance?
The direct path is about 9 miles (14.5 km), while the road route adds roughly 1.9 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 7:52 PM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $1.47 one way or $2.94 round trip. Estimated CO2 is about 3.5 kg one way.
What should you check before leaving?
Before you leave, expect Chance Showers And Thunderstorms around St. Louis and Partly Sunny then Chance Showers And Thunderstorms near Affton.
Stop Ideas Near Bella Villa
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 Bella Villa.
Gateway Transportation Center
Kirkwood
Alton
Washington
Flight Path Map
This map shows the direct air route between St. Louis and Affton. Straight-line distance: 9.02 mi (14.52 km).
#1 St. Louis
The second most populous city in Missouri and the center of the St.
| Population | 315,685 |
| Coordinates | 38.6272700, -90.1978900 |
| Altitude | 142 |
| 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: 18 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 00h 21m |
| 40 mph (64.37 km/h) | 00h 16m |
| 50 mph (80.47 km/h) | 00h 13m |
| 60 mph (96.56 km/h) | 00h 10m |
| 70 mph (112.65 km/h) | 00h 09m |
| 80 mph (129 km/h) | 00h 08m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $1.47 | $2.94 |
| Mid-grade | $4.25 | $1.66 | $3.32 |
| Premium | $4.65 | $1.82 | $3.63 |
| Diesel | $5.30 | $2.07 | $4.14 |
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 15, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.