How far is St. Louis, MO from Flat River, MO?
The driving distance from St. Louis, MO to Flat River, MO is about 64.6 miles (103.9 km), with a travel time of about 01h 19m by car.
- The straight-line flight distance is about 56.4 miles (90.8 km).
- For a round trip, plan for roughly 02h 38m 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 19m.
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
Route Weather Snapshot
Check the forecast at both ends before you head out.
Partly Cloudy
Driving Route Map
The map below follows the saved road route between St. Louis and Flat River.
Turn-by-Turn Driving Directions
Step-by-step road directions between St. Louis and Flat River.
-
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
32.7 mi · 38 min
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6
Take the exit slight right toward US 67 South: Farmington, Poplar Bluff
914 ft · 20 sec
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7
Keep slight left
729 ft · 18 sec
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8
Enter the roundabout and take exit 1 toward the route
9 m · 1 sec
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9
Exit the roundabout
26.4 mi · 30 min
-
10
Take the exit slight right toward US 67 Business, MO 8: Desloge, Park Hills
836 ft · 22 sec
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11
Turn right
107 m · 7 sec
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12
Turn left onto North Desloge Drive
1.9 mi · 3 min · North Desloge Drive
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13
Continue on Taylor Avenue
1.4 km · 2 min · Taylor Avenue
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14
Continue on Coffman Street
116 m · 14 sec · Coffman Street
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15
Turn left onto West Main Street
1420 ft · 32 sec · West Main Street
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16
Turn left onto Crane Street
93 m · 8 sec · Crane Street
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17
Arrive at your destination
0 m · 1 sec · Crane Street
Car Route Details
A richer read on the saved driving route between St. Louis and Flat River.
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 South
Merge slight left
32.7 mi · 00h 38m
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.
Sunny leaving St. Louis and Partly Cloudy near Flat River.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from St. Louis to Flat River?
The road trip is about 64.6 miles (103.9 km) and usually takes 01h 19m 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?
Festus is a useful midpoint, sitting about 32.3 miles from St. Louis and 32.2 miles from Flat River.
How much longer is the road route than the straight-line distance?
The direct path is about 56.4 miles (90.8 km), while the road route adds roughly 8.2 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 3:52 PM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $8.60 one way or $17.20 round trip. Estimated CO2 is about 20.3 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around St. Louis and Partly Cloudy near Flat River.
Stop Ideas Near Festus
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 Festus.
Kirkwood
Gateway Transportation Center
Washington
Alton
Flight Path Map
This map shows the direct air route between St. Louis and Flat River. Straight-line distance: 56.42 mi (90.8 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 Flat River
River in Michigan, United States of America
| Population | 5,157 |
| Coordinates | 37.8500500, -90.5167900 |
| Altitude | 219 |
| Country | United States |
End: Flat River (-90.51679, 37.85005)
Estimated Travel Time
Distance: 104 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 02h 09m |
| 40 mph (64.37 km/h) | 01h 36m |
| 50 mph (80.47 km/h) | 01h 17m |
| 60 mph (96.56 km/h) | 01h 04m |
| 70 mph (112.65 km/h) | 00h 55m |
| 80 mph (129 km/h) | 00h 48m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $8.60 | $17.20 |
| Mid-grade | $4.25 | $9.70 | $19.39 |
| Premium | $4.65 | $10.61 | $21.22 |
| Diesel | $5.30 | $12.09 | $24.19 |
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 13, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.