Drive Time
12m
Distance
8.6 mi
14 km
Drive Score
6/10
Good drive
Same Day?
Yes, doable
Fuel Cost
$1
one way
Photo: Yaroslav Shuraev
The drive from Saint John, MO to Florissant, MO covers 8.6 miles and takes about 12m behind the wheel. This route is realistic as a one-day drive if you keep your stops efficient.
The route leans on Marshall Road, Saint Charles Rock Road, I 170 North for much of the mileage, and the overall profile is turn-heavy local drive. At current regular gas prices, budget about $1.31 one way before food or hotel costs.
Trip Pace
Same-day drive is realistic
A same-day return is realistic if you keep stops short.
Break Rhythm
0 planned breaks
A short stop every 2 to 3 hours is enough for this drive.
Midpoint
4.3 miles from Saint John, MO
A natural place for your longest stop of the day , about 6m into the drive .
Expect a 12m drive with frequent turns across 8.6 miles of local and secondary roads.
Expect a hands-on drive with frequent turns and local roads rather than long highway stretches. Navigation is very simple — set it and forget it for most of the drive.
Very easy - short and simple to drive
The drive from Saint John, MO to Florissant, MO is easy. At 12m with 0% highway, most drivers will find it relaxed and low-stress.
Where does it get tricky?
This route does not have any notably tricky sections. Most of the drive from Saint John, MO to Florissant, MO is straightforward, with well-signed roads and simple exits.
| Road | Distance | Duration |
|---|---|---|
| Marshall Road | Unavailable | Refreshing |
| Saint Charles Rock Road | Unavailable | Refreshing |
| I 170 North | Unavailable | Refreshing |
| Inner Belt Expressway | Unavailable | Refreshing |
| I 270 East | Unavailable | Refreshing |
| Rosemary Straub Davison Highway | Unavailable | Refreshing |
| Pershall Road | Unavailable | Refreshing |
| South New Florissant Road | Unavailable | Refreshing |
Per-road distance and duration are being refreshed from OSRM for this route.
Step-by-step road directions between Saint John, MO and Florissant, MO.
Start on Mavis Place
Turn left onto Marshall Road
At the end of the road, turn left onto Saint Charles Rock Road
Take the ramp slight left toward I 170 North
Merge slight left onto Inner Belt Expressway
Keep slight right to continue on I 270 East: Chicago
Merge slight left onto Rosemary Straub Davison Highway
Take the exit slight right
Turn straight onto Pershall Road
Turn sharp left onto South New Florissant Road
Arrive at your destination
Morning Departure
Leave by 9 AM and you'll arrive before lunch.
Evening Departure
Even a 4 PM departure gets you there before dark in summer.
This is a comfortable same-day trip.
Departure
Before you leave
Start with fuel, water, and navigation already sorted so the first hour feels easy.
First stop
Around 8.6 miles or 12m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 4.3 miles or 6m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Final approach
Final hour starts around 10m
Traffic, exits, and arrival timing usually matter more near Florissant, MO than in the middle of the route.
Open the route before leaving Saint John, MO so your first major turns are already loaded.
Leave with enough water and a charging cable within reach, not packed away.
Check your fuel range against the first long segment, especially if you are starting outside city service areas.
Day 1
Settle into the route from Saint John, MO
This is one driving day of about 8.6 miles and 12m.
Rest stops, refuel points, and overnight suggestions along this route.
Halfway Point
Midpoint
About 4.3 mi from Saint John, MO · 6m into the drive
Mid-route town
Meal stop
4 mi into the route
Best for: Lunch, fuel, and a longer reset
This sits close to the middle of the route, so it works well for the longest stop of the day.
The final approach into Florissant, MO usually feels slower than the middle of the drive, so avoid planning your tightest schedule at the very end.
Try to arrive with enough fuel left to skip an immediate station stop unless you already know the area around Florissant, MO.
These stop ideas are pacing suggestions — the exact town or exit can change with traffic, hotel plans, and fuel range.
Regular Gas
$1.31 one way
$2.61 round trip
| Fuel Type | $/gal | One Way | Round Trip |
|---|---|---|---|
| midgrade | $4.25 | $1.44 | $2.88 |
| premium | $4.80 | $1.62 | $3.25 |
| diesel | $5.64 | $1.91 | $3.82 |
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$1
Meals
$25–$50
Total
$26–$51
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 3 kg one way. Prices: EIA weekly data, 2026-04-06.
Driving Electric?
About $1 in charging · 0 stops · 67% less CO2
| Vehicle Type | kWh | Stops | DC Fast | Home Charge |
|---|---|---|---|---|
| Average EV | 2.6 | 0 | $0.90 | $0.41 |
| Efficient EV | 2.2 | 0 | $0.75 | $0.34 |
| EV Truck/SUV | 3.4 | 0 | $1.20 | $0.55 |
Gas CO2
3 kg
EV CO2
1 kg (67% 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.
Travel Intel
Current conditions at both ends of the drive. If you're planning ahead, check the forecast closer to your travel date.
Origin
Afternoon in Saint John on Saturday
Local time
2:57 PM
CDT
Current temp
59°F
Forecast unavailable right now
Destination
Afternoon in Florissant on Saturday
Local time
2:57 PM
CDT
Current temp
55°F
Forecast unavailable right now
Along the Route
57°F
Alton, IL
4 mi in
Seasonal Notes
Summer travel usually means heavier construction, hotter rest stops, and busier weekend traffic around major cities.
Winter travel shortens daylight, so a route that looks manageable on paper can feel much longer after dark.
Holiday weekends tend to make both departure and arrival windows slower than the raw route time suggests.
Time zone
Origin and destination are on the same clock, so arrival timing is easier to judge at a glance.
Temperature spread
A meaningful temperature swing is a good cue to rethink layers, water, and how soon you want to arrive.
Road read
Use the two city cards together: check the sky where you start, then compare it with the local time and temperature at arrival.
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