Origin
Florissant, MO
Late night in Florissant on Tuesday
Local time
3:54 AM
CDT
Current temp
72°F
Unavailable
Live forecast
Trip from Florissant, MO to Affton, MO
Pin this tripCompiled and reviewed by the US Trip Planner planning team at COD Solutions Oy · Last reviewed Apr 21, 2026 · Editorial standards
Drive Time
31m
Distance
19.8 mi
32 km
Drive Score
8/10
Great drive
Same Day?
Yes, doable
Fuel Cost
$3
one way
EV Charging
Unknown
Best Time to Leave
4 AM
0h 29m
★
6 AM
0h 32m
8 AM
0h 37m
10 AM
0h 34m
12 PM
0h 33m
3 PM
0h 34m
5 PM
0h 37m
8 PM
0h 30m
Estimated drive times based on typical traffic patterns. Actual times may vary with weather, construction, and real-time conditions.
Florissant, MO
Wikimedia Commons
Affton, MO
Wikimedia Commons
Trip Overview
This short 19.8-mile drive from Florissant, MO to Affton, MO is easily manageable as a day trip, taking approximately 31 minutes to complete. You'll primarily navigate on the Inner Belt Expressway, Laclede Station Road, and South Hanley Road, with about half of your journey on highways. The estimated fuel cost is a modest $3, making it an economical option for a quick regional hop within the Midwest. Given its brevity, there's no need to consider an overnight split; you can easily fit this into a single day's itinerary. This route offers a practical and straightforward way to travel between these two Missouri communities.
Main Roads
| Road | Distance | Duration |
|---|---|---|
| Inner Belt Expressway | 10.4 mi | 12m |
| Laclede Station Road | 3.6 mi | 6m |
| South Hanley Road | 1.6 mi | 3m |
| North New Florissant Road | 1.2 mi | 2m |
| Rosemary Straub Davison Highway | 0.5 mi | <1m |
| South Rock Hill Road | 0.4 mi | <1m |
| Eager Road | 0.4 mi | <1m |
| Dunn Road | 0.2 mi | <1m |
Longest stretch:
Inner Belt Expressway
— 10.4 mi, about 12m
Turn-by-Turn Driving Directions
Step-by-step road directions between Florissant, MO and Affton, 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
10 mi
·
12 min
·
Inner Belt Expressway
Use the slight left / straight lanes.
7
Take the exit
0.2 mi
·
21 sec
Exit 1C
Toward Brentwood Boulevard North, Eager Road
Use the straight / slight right lanes.
8
Keep slight left at fork
512 ft
·
10 sec
Toward Eager Road
9
Continue on this road
0.1 mi
·
14 sec
·
this road
Exit 1C
Toward Eager Road
10
Turn left onto Eager Road
0.4 mi
·
49 sec
·
Eager Road
Use the left / straight lanes.
11
Turn slight right
512 ft
·
18 sec
12
Keep slight left at fork
137 ft
·
5 sec
13
Turn right onto South Hanley Road
1.6 mi
·
3 min
·
South Hanley Road
14
Continue on Laclede Station Road
3.6 mi
·
6 min
·
Laclede Station Road
Use the left lane.
15
Turn left onto South Rock Hill Road
0.4 mi
·
51 sec
·
South Rock Hill Road
16
Turn right onto Valcour Avenue
0.2 mi
·
33 sec
·
Valcour Avenue
17
Turn left onto MO 30
0.2 mi
·
18 sec
·
Gravois Road
18
Turn right
38 ft
·
7 sec
19
Turn left
87 ft
·
6 sec
20
Arrive at destination
Heads-up: tricky spots
5 of 145 decision points cluster between mile 2.1 and 19.6 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
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
8
13 mi into trip
|
~17m in
Take the exit toward Brentwood Boulevard North, Eager Road
Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one
Use the straight / slight right lanes.
Exit 1C
Toward Brentwood Boulevard North, Eager Road
6
13.2 mi into trip
|
~17m in
Keep slight left at fork toward Eager Road
Highway fork - watch signs carefully
Toward Eager Road
5
13.8 mi into trip
|
~19m in
Keep slight left at fork
Highway fork - watch signs carefully
5
19.6 mi into trip
|
~31m in
|
MO 30 / Gravois Road
Turn left onto MO 30 / Gravois Road
Navigation decision point
Fuel & Cost
Regular Gas
$3.10 one way
$6.19 round trip
$3.97/gal
25.4 MPG avg
7 kg CO2
| Fuel Type | $/gal | One Way | Round Trip |
|---|---|---|---|
| midgrade | $4.36 | $3.40 | $6.80 |
| premium | $4.89 | $3.81 | $7.62 |
| diesel | $5.61 | $4.37 | $8.74 |
No toll roads detected on this route.
Drive Cost (one way)
Fuel
$3
Estimated CO2 emission: 6.9 kg one way. Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $2 in charging · 0 stops · 71% less CO2
| Vehicle Type | kWh | Stops | DC Fast | Home Charge |
|---|---|---|---|---|
| Average EV | 5.9 | 0 | $2.08 | $0.95 |
| Efficient EV | 5 | 0 | $1.73 | $0.79 |
| EV Truck/SUV | 7.9 | 0 | $2.77 | $1.27 |
Gas CO2
7 kg
EV CO2
2 kg (71% 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
Affton, MO
Late night in Affton on Tuesday
Local time
3:54 AM
CDT
Current temp
71°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
1 degrees cooler at arrival
A meaningful temperature swing is a good cue to rethink layers, water, and how soon you want to arrive.
Road read
31m 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.
What kind of drive is this?
Expect a mixed driving experience on this route, with 52% of the journey utilizing highway speeds. The longest uninterrupted stretch you'll encounter is 10.4 miles along the Inner Belt Expressway, providing a good opportunity for steady progress. As you transition between the Inner Belt Expressway and local roads like Laclede Station Road and South Hanley Road, the character of the drive will shift from faster highway travel to more typical suburban surface streets. This blend means you'll experience both efficient transit and the nuances of navigating through more developed areas.
52% highway, the rest on surface roads — varied driving throughout.
20 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 10.4 mi on Inner Belt Expressway.
How Hard Is This Drive?
8/10
This route mixes highway mileage with some local-road sections near the start or finish. This route has several spots where lane changes, forks, or exits need your full attention. The trickiest moment comes around 2.1 miles in.
Driving Effort
8/10
Focused - busy navigation packed into a short drive
Balances navigation complexity with total wheel time.
This is a short but busy drive. With 14 decision points packed into just 19.8 miles, you will need to pay attention to lane changes and exits — but the whole thing is over in 31m.
Where does it get tricky?
The main spots that need attention: at 2.1 miles: Exit ramp - move to the correct lane early. Lane positioning matters here; at 13 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one; at 13.2 miles: Highway fork - watch signs carefully.
Towns Mentioned on Route Signs
Based on OSRM destination-sign hints, not a full list of every settlement the road passes.
Towns Mentioned on Route Signs
Based on OSRM destination-sign hints, not a full list of every settlement the road passes.
On the drive from Florissant, MO to Affton, MO, road signs begin pointing toward Brentwood Boulevard North along the way.
Brentwood Boulevard North
13 mi in
|
~17m
Who Is This Route For?
Weekend Trip
Doable as a same-day drive at 31m. Total distance: 19.8 miles.
Family Friendly
Moderate complexity with 0 natural rest stops along the way.
Solo Traveler
31m drive, comfortable solo distance.
EV Driver
0 DC fast chargers along the route. Coverage: unknown.
First-Time Driver
Mostly highway driving (52%). Some complex stretches to watch for.
Scenic Drive
Mixed highway & surface route profile with national parks nearby.
Frequently Asked Questions
The longest stretch is about 10.4 miles on Inner Belt Expressway. The full list of main roads is in the Roads section above.
It helps. This route has a higher-than-average number of complex decision points, which get harder in the dark. If the last hour of the trip is on surface roads or mountain grades, aim to arrive at Affton, MO before sunset when you can. Check the Trip Plan for departure windows that land you in daylight.
Yes. At under 2 hours behind the wheel, this works well for families — plan one quick stop if you have younger kids.
The main spots that need attention: at 2.1 miles: Exit ramp - move to the correct lane early. Lane positioning matters here; at 13 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one; at 13.2 miles: Highway fork - watch signs carefully.
Yes — Gateway Arch National Park. See the National Parks section for detour distances and tips on detours.
Yes. A round trip is manageable in a single day if you plan a break at Affton, MO before heading back.
How this page is built
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, and NPS for national parks. See our methodology for refresh cadence and limitations.
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