How far is Florissant, MO from Lemay, MO?
The driving distance from Florissant, MO to Lemay, MO is about 23.9 miles (38.4 km), with a travel time of about 00h 38m by car.
- The straight-line flight distance is about 17.8 miles (28.7 km).
- For a round trip, plan for roughly 01h 17m 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 38m.
This is a short drive, so your comfort window is wide. Traffic and current weather matter more than the clock.
This departure sits inside the recommended comfort window for the route.
Halfway Point
A useful midpoint for breaks, coffee, or meeting in the middle.
Inner-ring suburb of St.
Route Weather Snapshot
Check the forecast at both ends before you head out.
Mostly Sunny
Driving Route Map
The map below follows the saved road route between Florissant and Lemay.
Turn-by-Turn Driving Directions
Step-by-step road directions between Florissant and Lemay.
-
1
Start on North New Florissant Road
1.2 mi · 2 min · North New Florissant Road
-
2
Turn right onto Dunn Road
1088 ft · 29 sec · Dunn Road
-
3
Take the ramp straight toward I 270 West
1267 ft · 31 sec
-
4
Merge slight left onto Rosemary Straub Davison Highway
2574 ft · 37 sec · Rosemary Straub Davison Highway
-
5
Take the exit slight right toward I 170 South: Clayton
2751 ft · 47 sec
-
6
Continue on Inner Belt Expressway
10.5 mi · 13 min · Inner Belt Expressway
-
7
Keep slight left to continue on I 64 East, US 40 East: Saint Louis
2901 ft · 46 sec
-
8
Merge slight left onto Daniel Boone Expressway
1.4 mi · 2 min · Daniel Boone Expressway
-
9
Take the exit slight right toward McCausland Avenue
1052 ft · 26 sec
-
10
Turn right onto McCausland Avenue
1.5 mi · 3 min · McCausland Avenue
-
11
Continue on Ellendale Avenue
2852 ft · 56 sec · Ellendale Avenue
-
12
Continue on Wellington Avenue
1740 ft · 35 sec · Wellington Avenue
-
13
Continue on Wabash Avenue
1709 ft · 34 sec · Wabash Avenue
-
14
Turn right onto Lansdowne Avenue
651 ft · 25 sec · Lansdowne Avenue
-
15
Turn left onto River Des Peres Boulevard
3.2 mi · 6 min · River Des Peres Boulevard
-
16
Continue on Carondelet Boulevard
1.3 km · 2 min · Carondelet Boulevard
-
17
Continue on River City Boulevard
3065 ft · 2 min · River City Boulevard
-
18
Turn right onto Lemay Ferry Road
682 ft · 26 sec · Lemay Ferry Road
-
19
Turn left onto Military Road
1.2 km · 2 min · Military Road
-
20
Continue on Gentry Avenue
827 ft · 24 sec · Gentry Avenue
-
21
Turn right onto Placid Avenue
106 m · 17 sec · Placid Avenue
-
22
Turn right onto Rembold Avenue
61 m · 9 sec · Rembold Avenue
-
23
Arrive at your destination
0 m · 1 sec · Rembold Avenue
Car Route Details
A richer read on the saved driving route between Florissant and Lemay.
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.
Inner Belt Expressway
Continue on Inner Belt Expressway
10.5 mi · 00h 13m
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.
Mostly Sunny leaving Florissant and Sunny near Lemay.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Florissant to Lemay?
The road trip is about 23.9 miles (38.4 km) and usually takes 00h 38m 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?
Clayton is a useful midpoint, sitting about 11.9 miles from Florissant and 11.9 miles from Lemay.
How much longer is the road route than the straight-line distance?
The direct path is about 17.8 miles (28.7 km), while the road route adds roughly 6.1 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 7:12 PM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $3.17 one way or $6.34 round trip. Estimated CO2 is about 7.5 kg one way.
What should you check before leaving?
Before you leave, expect Mostly Sunny around Florissant and Sunny near Lemay.
Stop Ideas Near Clayton
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 Clayton.
Kirkwood
Gateway Transportation Center
Alton
Washington
Flight Path Map
This map shows the direct air route between Florissant and Lemay. Straight-line distance: 17.83 mi (28.69 km).
#1 Florissant
The most populous city in St.
| Population | 50,795 |
| Coordinates | 38.7892200, -90.3226100 |
| Altitude | 175 |
| Country | United States |
#2 Lemay
Census designated place
| Population | 16,645 |
| Coordinates | 38.5333900, -90.2792800 |
| Altitude | 144 |
| Country | United States |
End: Lemay (-90.27928, 38.53339)
Estimated Travel Time
Distance: 38 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 00h 47m |
| 40 mph (64.37 km/h) | 00h 35m |
| 50 mph (80.47 km/h) | 00h 28m |
| 60 mph (96.56 km/h) | 00h 23m |
| 70 mph (112.65 km/h) | 00h 20m |
| 80 mph (129 km/h) | 00h 17m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $3.17 | $6.34 |
| Mid-grade | $4.25 | $3.57 | $7.15 |
| Premium | $4.65 | $3.91 | $7.82 |
| Diesel | $5.30 | $4.46 | $8.91 |
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 23, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.