Compiled and reviewed by the US Trip Planner planning team at COD Solutions Oy · Last reviewed Sep 4, 2026 · Editorial standards
Drive Time
40m
Distance
28.4 mi
46 km
Drive Score
8/10
Great drive
Same Day?
Yes, doable
Fuel Cost
$4
one way
EV Charging
Good
8 stations
Estimated drive times based on typical traffic patterns. Actual times may vary with weather, construction, and real-time conditions.
Florissant, MO
Wikimedia Commons
Lake Saint Louis, MO
Amicia Short
The drive from Florissant, MO to Lake Saint Louis, MO covers 28.4 miles and takes about 40m behind the wheel. This route is realistic as a one-day drive if you keep your stops efficient.
The route leans on I 70, Rosemary Straub Davison Highway, Lindbergh Boulevard for much of the mileage, and the overall profile is mostly highway. The longest uninterrupted segment is about 18.2 miles on I 70. At current regular gas prices, budget about $4.40 one way before food or hotel costs.
| Road | Distance | Duration |
|---|---|---|
| I 70 | 18.2 mi | 22m |
| Rosemary Straub Davison Highway | 3.7 mi | 4m |
| Lindbergh Boulevard | 1.7 mi | 3m |
| Veterans Memorial Parkway | 1.2 mi | 2m |
| Washington Street | 1 mi | 1m |
| Savoy Drive | 0.4 mi | 1m |
| De Loire Drive | 0.3 mi | 1m |
| Lake Saint Louis Boulevard | <0.1 mi | <1m |
Hour-of-day weekday pattern from 22 FHWA count stations on your route.
Peak
4 PM
~6,486 veh/hr typical
Quietest
2 AM
~540 veh/hr
Peak-to-quiet ratio
12×
busier at peak than in the quiet hours
Averaged across 105 weeks of 2023 FHWA Travel Monitoring Analysis System data. Weekday hours only (Mon–Fri).
Step-by-step road directions between Florissant, MO and Lake Saint Louis, MO.
Start on North New Florissant Road
Turn right onto Washington Street
Turn left onto US 67
Take the ramp
Merge onto I 270
Take the exit
Continue on this road
Keep slight right at fork
Merge onto I 70
Take the exit
Turn left onto Lake Saint Louis Boulevard
Enter roundabout onto Veterans Memorial Parkway
Continue on Veterans Memorial Parkway
Turn left onto De Loire Drive
At end of road, turn left onto Savoy Drive
Arrive at destination
5 decision points cluster between mile 3.1 and 26.3 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
Merge onto I 270 / Rosemary Straub Davison Highway
Merge point - match speed before joining. Lane positioning matters here
Take the exit toward I 70: Saint Louis, Kansas City
Exit ramp - move to the correct lane early. Multiple destination signs - pick the right one
Continue toward I 70: Saint Louis, Kansas City
Lane positioning matters here. Multiple destination signs - pick the right one
Keep slight right at fork toward I 70 West: Kansas City
Highway fork - watch signs carefully. Lane positioning matters here
Take the exit toward Lake Saint Louis Boulevard
Exit ramp - move to the correct lane early. Lane positioning matters here
Regular Gas
$4.40 one way
$8.81 round trip
| Fuel Type | $/gal | One Way | Round Trip |
|---|---|---|---|
| midgrade | $4.32 | $4.83 | $9.66 |
| premium | $4.93 | $5.51 | $11.02 |
| diesel | $5.60 | $6.26 | $12.52 |
No toll roads detected on this route.
Drive Cost (one way)
Fuel
$4
Estimated CO2 emission: 9.9 kg one way. Prices: EIA weekly data, 2026-08-31.
Driving Electric?
About $3 in charging · 0 stops · 70% less CO2
| Vehicle Type | kWh | Stops | DC Fast | Home Charge |
|---|---|---|---|---|
| Average EV | 8.5 | 0 | $2.98 | $1.36 |
| Efficient EV | 7.1 | 0 | $2.49 | $1.14 |
| EV Truck/SUV | 11.4 | 0 | $3.98 | $1.82 |
Gas CO2
10 kg
EV CO2
3 kg (70% less)
This trip is well within single-charge range for most EVs. No charging stops needed if you start fully charged.
DC fast charging avg $0.35/kWh. Home charging avg $0.16/kWh. US grid CO2: 0.39 kg/kWh.
Current conditions at both ends of the drive.
Origin
Afternoon in Florissant on Friday
Local time
12:42 PM
CDT
Current temp
68°F
Mostly Clear
Destination
Afternoon in Lake Saint Louis on Friday
Local time
12:42 PM
CDT
Current temp
68°F
Mostly Clear
Time zone
Origin and destination are on the same clock, so arrival timing is easier to judge at a glance.
Temperature spread
Both ends of the route are sitting at about the same temperature right now.
Road read
The weather snapshot is not static. If you are leaving later, give both cities one more quick forecast check before departure.
Weather data from the National Weather Service. Conditions may change; check closer to your travel date.
28.4 mi in 40m, mostly highway — 18.2 mi of that is on I 70.
This is a straightforward highway drive that stays mostly on I 70 and Rosemary Straub Davison Highway. This route has several spots where lane changes, forks, or exits need your full attention. The trickiest moment comes around 3.1 miles in near I 270 / Rosemary Straub Davison Highway.
Focused - busy navigation packed into a short drive
Balances navigation complexity with total wheel time.
This is a short but busy drive. With 12 decision points packed into just 28.4 miles, you will need to pay attention to lane changes and exits — but the whole thing is over in 40m.
Where does it get tricky?
The main spots that need attention: at 3.1 miles (I 270 / Rosemary Straub Davison Highway): Merge point - match speed before joining. Lane positioning matters here; at 6.9 miles: Exit ramp - move to the correct lane early. Multiple destination signs - pick the right one; at 7.1 miles: Lane positioning matters here. Multiple destination signs - pick the right one.
Mostly flat terrain
Total Climb
407 ft
Total Descent
422 ft
Highest Point
606 ft
~12.2 mi in
Elevation Range
175 ft
Based on OSRM destination-sign hints, not a full list of every settlement the road passes.
On the drive from Florissant, MO to Lake Saint Louis, MO, road signs begin pointing toward Kansas City along the way.
Kansas City
Founded 1785
City content from Wikivoyage (CC BY-SA 4.0) and Wikidata (CC0).
Weekend Trip
Doable as a same-day drive at 40m. Total distance: 28.4 miles.
Family Friendly
Moderate complexity with 0 natural rest stops along the way.
Solo Traveler
40m drive, comfortable solo distance.
EV Driver
0 DC fast chargers along the route. Coverage: unknown.
First-Time Driver
Mostly highway driving (68%). Some complex stretches to watch for.
Compiled by the US Trip Planner planning team at COD Solutions Oy from open government datasets — OSRM over OpenStreetMap for geometry, EIA for fuel prices, USGS 3DEP for elevation, NPS for national parks, and FHWA TMAS for hourly traffic volumes. See our methodology for refresh cadence and limitations.
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