Origin
Florissant, MO
Evening in Florissant on Thursday
Local time
6:36 PM
CDT
Current temp
58°F
Unavailable
Live forecast
Trip from Florissant, MO to Saint Johns, MO
Last recalculated Apr 16, 2026
Drive Time
13m
Distance
8.2 mi
13 km
Drive Score
8/10
Great drive
Same Day?
Yes, doable
Fuel Cost
$1
one way
EV Charging
Unknown
Best Time to Leave
4 AM
0h 12m
★
6 AM
0h 14m
8 AM
0h 16m
10 AM
0h 14m
12 PM
0h 14m
3 PM
0h 14m
5 PM
0h 16m
8 PM
0h 13m
Estimated drive times based on typical traffic patterns. Actual times may vary with weather, construction, and real-time conditions.
Florissant, MO
Wikimedia Commons
Saint Johns, MO
Abdel Achkouk
Trip Overview
The drive from Florissant, MO to Saint Johns, MO covers 8.2 miles and takes about 13m behind the wheel. This route is realistic as a one-day drive if you keep your stops efficient.
The route leans on Inner Belt Expressway, North New Florissant Road, Rosemary Straub Davison Highway for much of the mileage, and the overall profile is mixed drive. The longest uninterrupted segment is about 4.7 miles on Inner Belt Expressway. At current regular gas prices, budget about $1.28 one way before food or hotel costs.
Who Is This Route For?
Weekend Trip
Doable as a same-day drive at 13m. Total distance: 8.2 miles.
Family Friendly
Moderate complexity with 0 natural rest stops along the way.
Solo Traveler
13m drive, comfortable solo distance.
EV Driver
0 DC fast chargers along the route. Coverage: unknown.
First-Time Driver
Mostly highway driving (57%). Some complex stretches to watch for.
Scenic Drive
Mixed drive route profile with national parks nearby.
Drive Character
The drive from Florissant, MO to Saint Johns, MO covers 8.2 miles and takes about 13m, using a mix of highways and local roads.
Expect a mix of faster highway mileage and slower local approaches near the beginning or end.
There are about 13 navigation steps in the underlying route data, so the final approach matters more than the middle miles.
Inner Belt Expressway is the longest continuous segment at about 4.7 miles.
How Hard Is This Drive?
This route mixes highway mileage with some local-road sections near the start or finish. You will hit about 9 points where you need to pay attention to lane position or signs. The trickiest moment comes around 1.2 miles in near Dunn Road.
Driving Effort
6/10
Moderate - straightforward overall, but long enough or busy enough to require pacing
Balances navigation complexity with total wheel time.
This drive requires moderate attention. Across 8.2 miles you will encounter 9 spots where lane choice or exit timing matters. Not difficult for experienced highway drivers, but worth previewing the tricky sections before you go.
Where does it get tricky?
The main spots that need attention: at 1.2 miles (Dunn Road): Lane positioning matters here; at 2.1 miles: Exit ramp - move to the correct lane early. Lane positioning matters here; at 7.3 miles: Exit ramp - move to the correct lane early. Lane positioning matters here.
Critical Maneuvers
5 of 9 key pointsThese are the spots where you need to pay the most attention. Preview them before you drive.
4
1.2 mi into trip
|
~2m in
|
Dunn Road
Turn right onto Dunn Road
Lane positioning matters here
Use the right lane.
7
2.1 mi into trip
|
~4m in
Take the exit toward I 170 South: Clayton
Exit ramp - move to the correct lane early. Lane positioning matters here
Use the straight / slight right lanes.
Exit 26A
Toward I 170 South: Clayton
7
7.3 mi into trip
|
~10m in
Take the exit toward MO 180: Saint Charles Rock Road
Exit ramp - move to the correct lane early. Lane positioning matters here
Use the slight right lane.
Exit 5
Toward MO 180: Saint Charles Rock Road
8
7.5 mi into trip
|
~10m in
Keep slight right at fork toward MO 180: Saint Charles Rock Road
Highway fork - watch signs carefully. Lane positioning matters here
Use the straight / slight left lanes.
Toward MO 180: Saint Charles Rock Road
5
8.1 mi into trip
|
~13m in
|
Betty Lee Avenue
At end of road, turn left onto Betty Lee Avenue
Navigation decision point
Main Roads
| Road | Distance | Duration |
|---|---|---|
| Inner Belt Expressway | 4.7 mi | 5m |
| North New Florissant Road | 1.2 mi | 2m |
| Rosemary Straub Davison Highway | 0.5 mi | <1m |
| Walton Road | 0.5 mi | 1m |
| Dunn Road | 0.2 mi | <1m |
| Saint Charles Rock Road | 0.1 mi | <1m |
| Betty Lee Avenue | <0.1 mi | <1m |
| Hilleman Avenue | <0.1 mi | <1m |
Longest stretch:
Inner Belt Expressway
— 4.7 mi, about 5m
Turn-by-Turn Driving Directions
Step-by-step road directions between Florissant, MO and Saint Johns, MO.
1
Start on North New Florissant Road
1.2 mi
·
2 min
·
North New Florissant Road
2
Turn right onto Dunn Road
0.2 mi
·
29 sec
·
Dunn Road
Use the right lane.
3
Take the ramp
0.2 mi
·
30 sec
Toward I 270 West
4
Merge onto I 270
0.5 mi
·
36 sec
·
Rosemary Straub Davison Highway
5
Take the exit
0.5 mi
·
46 sec
Exit 26A
Toward I 170 South: Clayton
Use the straight / slight right lanes.
6
Continue on I 170
4.7 mi
·
5 min
·
Inner Belt Expressway
Use the slight left / straight lanes.
7
Take the exit
0.1 mi
·
16 sec
Exit 5
Toward MO 180: Saint Charles Rock Road
Use the slight right lane.
8
Keep slight right at fork
385 ft
·
10 sec
Toward MO 180: Saint Charles Rock Road
Use the straight / slight left lanes.
9
Turn slight right onto MO 180
0.1 mi
·
12 sec
·
Saint Charles Rock Road
10
Turn right onto Walton Road
0.5 mi
·
1 min
·
Walton Road
11
At end of road, turn left onto Betty Lee Avenue
457 ft
·
22 sec
·
Betty Lee Avenue
12
Turn right onto Hilleman Avenue
105 ft
·
4 sec
·
Hilleman Avenue
13
Arrive at destination
Hilleman Avenue
Fuel & Cost
Regular Gas
$1.28 one way
$2.56 round trip
$3.97/gal
25.4 MPG avg
3 kg CO2
| Fuel Type | $/gal | One Way | Round Trip |
|---|---|---|---|
| midgrade | $4.36 | $1.41 | $2.82 |
| premium | $4.89 | $1.58 | $3.16 |
| diesel | $5.61 | $1.81 | $3.62 |
No toll roads detected on this route.
Drive Cost (one way)
Fuel
$1
Estimated CO2 emission: 2.9 kg one way. Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $1 in charging · 0 stops · 67% less CO2
| Vehicle Type | kWh | Stops | DC Fast | Home Charge |
|---|---|---|---|---|
| Average EV | 2.5 | 0 | $0.86 | $0.39 |
| Efficient EV | 2.1 | 0 | $0.72 | $0.33 |
| EV Truck/SUV | 3.3 | 0 | $1.15 | $0.52 |
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.
Destination
Saint Johns, MO
Evening in Saint Johns on Thursday
Local time
6:36 PM
CDT
Current temp
78°F
Unavailable
Live forecast
Time zone
Same local time
Origin and destination are on the same clock, so arrival timing is easier to judge at a glance.
Temperature spread
20 degrees warmer at arrival
A meaningful temperature swing is a good cue to rethink layers, water, and how soon you want to arrive.
Road read
13m on the road
Use the two city cards together: check the sky where you start, then compare it with the local time and temperature at arrival.
Weather data from the National Weather Service. Conditions may change; check closer to your travel date.
Frequently Asked Questions
The drive from Florissant, MO to Saint Johns, MO covers 8.2 miles and takes about 13m without stops. Add 15-30 minutes for a fuel or rest stop on longer drives.
The main roads are Inner Belt Expressway, North New Florissant Road, Rosemary Straub Davison Highway. Expect a mix of highway and local road driving.
This is a comfortable same-day trip.
The midpoint is about 4.1 miles from Florissant, MO. Look for rest areas, gas stations, or food options near the halfway mark.
At current regular gas prices, expect to spend about $1.28 one way. This estimate uses 25.4 MPG — your actual cost will vary with your vehicle's fuel efficiency and current gas prices.
Leave by 9 AM and you'll arrive before lunch. Even a 4 PM departure gets you there before dark in summer.
This drive requires moderate attention. Across 8.2 miles you will encounter 9 spots where lane choice or exit timing matters. Not difficult for experienced highway drivers, but worth previewing the tricky sections before you go.
The main spots that need attention: at 1.2 miles (Dunn Road): Lane positioning matters here; at 2.1 miles: Exit ramp - move to the correct lane early. Lane positioning matters here; at 7.3 miles: Exit ramp - move to the correct lane early. Lane positioning matters here.
The route from Florissant, MO to Saint Johns, MO does not surface many named destination signs beyond the main corridor.
Yes. Nearby national parks include Gateway Arch National Park.
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