How far is Florissant, MO from Lake Saint Louis, MO?
The driving distance from Florissant, MO to Lake Saint Louis, MO is about 28.5 miles (45.8 km), with a travel time of about 00h 40m by car.
- The straight-line flight distance is about 24.9 miles (40.1 km).
- For a round trip, plan for roughly 01h 20m 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 40m.
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.
A city in St.
Route Weather Snapshot
Check the forecast at both ends before you head out.
Sunny
Driving Route Map
The map below follows the saved road route between Florissant and Lake Saint Louis.
Turn-by-Turn Driving Directions
Step-by-step road directions between Florissant and Lake Saint Louis.
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1
Start on North New Florissant Road
26 m · 6 sec · North New Florissant Road
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2
Turn right onto Washington Street
1 mi · 2 min · Washington Street
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3
Turn left onto Lindbergh Boulevard
1.7 mi · 3 min · Lindbergh Boulevard
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4
Take the ramp slight right
1912 ft · 47 sec
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5
Merge slight left onto Rosemary Straub Davison Highway
3.7 mi · 5 min · Rosemary Straub Davison Highway
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6
Take the exit slight right toward I 70: Saint Louis, Kansas City
1492 ft · 26 sec
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7
Continue on I 70: Saint Louis, Kansas City
2478 ft · 43 sec
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8
Keep slight right to continue on I 70 West: Kansas City
2439 ft · 42 sec
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9
Merge slight left
18.2 mi · 23 min
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10
Take the exit slight right toward Lake Saint Louis Boulevard
878 ft · 27 sec
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11
Turn left onto Lake Saint Louis Boulevard
132 m · 12 sec · Lake Saint Louis Boulevard
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12
Enter the roundabout and take exit 1 toward Veterans Memorial Parkway
26 m · 2 sec · Veterans Memorial Parkway
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13
Exit the roundabout onto Veterans Memorial Parkway
1.2 mi · 2 min · Veterans Memorial Parkway
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14
Turn left onto De Loire Drive
1517 ft · 1 min · De Loire Drive
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15
At the end of the road, turn left onto Savoy Drive
2289 ft · 1 min · Savoy Drive
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16
Arrive at your destination
0 m · 1 sec · Savoy Drive
Car Route Details
A richer read on the saved driving route between Florissant and Lake Saint Louis.
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 70 West
Merge slight left
18.2 mi · 00h 23m
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 Florissant and Sunny near Lake Saint Louis.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Florissant to Lake Saint Louis?
The road trip is about 28.5 miles (45.8 km) and usually takes 00h 40m 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?
Saint Charles is a useful midpoint, sitting about 14.2 miles from Florissant and 14.2 miles from Lake Saint Louis.
How much longer is the road route than the straight-line distance?
The direct path is about 24.9 miles (40.1 km), while the road route adds roughly 3.6 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 7:10 PM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $3.77 one way or $7.54 round trip. Estimated CO2 is about 8.9 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around Florissant and Sunny near Lake Saint Louis.
Stop Ideas Near Saint Charles
Useful break, food, and waypoint ideas within about 15 miles of the route midpoint.
City Hall Park
City of O'Fallon
Vinita Park City Hall
Transit and Meeting Points
Useful pickup, handoff, or rendezvous points close to Saint Charles.
Kirkwood
Gateway Transportation Center
Alton
Washington
Flight Path Map
This map shows the direct air route between Florissant and Lake Saint Louis. Straight-line distance: 24.94 mi (40.14 km).
#1 Florissant
The most populous city in St.
| Population | 50,795 |
| Coordinates | 38.7892200, -90.3226100 |
| Altitude | 175 |
| Country | United States |
#2 Lake Saint Louis
City in Saint Charles County, Missouri, United States
| Population | 17,186 |
| Coordinates | 38.7975500, -90.7856800 |
| Altitude | 172 |
| Country | United States |
End: Lake Saint Louis (-90.78568, 38.79755)
Estimated Travel Time
Distance: 46 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 00h 56m |
| 40 mph (64.37 km/h) | 00h 42m |
| 50 mph (80.47 km/h) | 00h 34m |
| 60 mph (96.56 km/h) | 00h 28m |
| 70 mph (112.65 km/h) | 00h 24m |
| 80 mph (129 km/h) | 00h 21m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $3.77 | $7.54 |
| Mid-grade | $4.25 | $4.25 | $8.51 |
| Premium | $4.65 | $4.65 | $9.31 |
| Diesel | $5.30 | $5.30 | $10.61 |
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 20, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.