Origin
Florissant, MO
Night in Florissant on Saturday
Local time
9:54 PM
CDT
Current temp
83°F
Unavailable
Live forecast
Trip from Florissant, MO to Byrnes Mill, MO
Compiled and reviewed by the US Trip Planner planning team at COD Solutions Oy · Last reviewed Apr 19, 2026 · Editorial standards
Drive Time
51m
Distance
36.8 mi
59 km
Drive Score
8/10
Great drive
Same Day?
Yes, doable
Fuel Cost
$6
one way
EV Charging
Unknown
Best Time to Leave
4 AM
0h 47m
★
6 AM
0h 51m
8 AM
1h 0m
10 AM
0h 54m
12 PM
0h 53m
3 PM
0h 55m
5 PM
0h 59m
8 PM
0h 49m
Estimated drive times based on typical traffic patterns. Actual times may vary with weather, construction, and real-time conditions.
Florissant, MO
Wikimedia Commons
Byrnes Mill, MO
Valeria Boltneva
Trip Overview
This 36.8-mile drive from Florissant, MO, to Byrnes Mill, MO, is a straightforward trip that can easily be completed in about 51 minutes. It's designed for a single day, making it a perfect short excursion within the Midwest region. With an estimated fuel cost of $6, this route is budget-friendly. You'll primarily be navigating Rosemary Straub Davison Highway and MO 30, with a portion on Lindbergh Boulevard. The mixed drive profile suggests a blend of road types, so expect a varied driving experience.
Main Roads
| Road | Distance | Duration |
|---|---|---|
| Rosemary Straub Davison Highway | 20.8 mi | 26m |
| MO 30 | 11.1 mi | 14m |
| Lindbergh Boulevard | 1.7 mi | 3m |
| Upper Byrnes Mill Road | 1.4 mi | 3m |
| Washington Street | 1 mi | 1m |
| North New Florissant Road | <0.1 mi | <1m |
Longest stretch:
Rosemary Straub Davison Highway
— 20.8 mi, about 26m
Turn-by-Turn Driving Directions
Step-by-step road directions between Florissant, MO and Byrnes Mill, MO.
1
Start on North New Florissant Road
87 ft
·
5 sec
·
North New Florissant Road
2
Turn right onto Washington Street
1.0 mi
·
1 min
·
Washington Street
3
Turn left onto US 67
1.7 mi
·
3 min
·
Lindbergh Boulevard
4
Take the ramp
0.4 mi
·
46 sec
Use the right lane.
5
Merge onto I 270
21 mi
·
26 min
·
Rosemary Straub Davison Highway
Use the straight / slight right lanes.
6
Take the exit
0.3 mi
·
33 sec
Exit 3
Toward MO 30: Gravois Road
Use the slight right lane.
7
Keep slight right at fork
306 ft
·
7 sec
Toward MO 30 West: Fenton
Use the right lane.
8
Merge onto MO 30
11 mi
·
14 min
·
MO 30
Use the straight lane.
9
Take the exit
109 ft
·
3 sec
Toward Upper Byrnes Mill Road
10
Turn slight right onto Upper Byrnes Mill Road
1.4 mi
·
3 min
·
Upper Byrnes Mill Road
11
Arrive at destination
Upper Byrnes Mill Road
Where to Stop
Rest stops, refuel points, and overnight suggestions along this route.
Mid-route town
Meal stop
18 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.
Pacing Suggestions
Fuel and coffee
A short stop after about 36.8 miles helps settle the day before fatigue starts building.
Meal break
The midpoint is around 18.4 miles from Florissant, MO, which is a good place for a longer meal and fuel stop.
These stop ideas are pacing suggestions — the exact town or exit can change with traffic, hotel plans, and fuel range.
Heads-up: tricky spots
5 of 75 decision points cluster between mile 0 and 24.3 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
4
0 mi into trip
|
~0m in
|
Washington Street
Turn right onto Washington Street
Navigation decision point
5
3.1 mi into trip
|
~6m in
|
I 270 / Rosemary Straub Davison Highway
Merge onto I 270 / Rosemary Straub Davison Highway
Merge point - match speed before joining. Lane positioning matters here
Use the straight / slight right lanes.
7
23.9 mi into trip
|
~32m in
Take the exit toward MO 30: Gravois Road
Exit ramp - move to the correct lane early. Lane positioning matters here
Use the slight right lane.
Exit 3
Toward MO 30: Gravois Road
8
24.2 mi into trip
|
~32m in
Keep slight right at fork toward MO 30 West: Fenton
Highway fork - watch signs carefully. Lane positioning matters here
Use the right lane.
Toward MO 30 West: Fenton
5
24.3 mi into trip
|
~32m in
|
MO 30
Merge onto MO 30
Merge point - match speed before joining. Lane positioning matters here
Use the straight lane.
Fuel & Cost
Regular Gas
$5.75 one way
$11.51 round trip
$3.97/gal
25.4 MPG avg
13 kg CO2
| Fuel Type | $/gal | One Way | Round Trip |
|---|---|---|---|
| midgrade | $4.36 | $6.32 | $12.63 |
| premium | $4.89 | $7.08 | $14.16 |
| diesel | $5.61 | $8.12 | $16.25 |
No toll roads detected on this route.
Drive Cost (one way)
Fuel
$6
Estimated CO2 emission: 12.9 kg one way. Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $4 in charging · 0 stops · 69% less CO2
| Vehicle Type | kWh | Stops | DC Fast | Home Charge |
|---|---|---|---|---|
| Average EV | 11 | 0 | $3.86 | $1.77 |
| Efficient EV | 9.2 | 0 | $3.22 | $1.47 |
| EV Truck/SUV | 14.7 | 0 | $5.15 | $2.36 |
Gas CO2
13 kg
EV CO2
4 kg (69% 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
Byrnes Mill, MO
Night in Byrnes Mill on Saturday
Local time
9:54 PM
CDT
Current temp
61°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
22 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
51m 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?
The character of this 51-minute drive is a mixed bag, with about 30% of the journey on highways. You'll encounter a significant uninterrupted stretch of 20.8 miles on Rosemary Straub Davison Highway, which likely offers a consistent pace. As you transition to MO 30 and then Lindbergh Boulevard, the road personality may shift, potentially offering more local traffic or intersections. This route avoids being a monotonous interstate grind, instead presenting a more varied feel as you progress through Missouri.
30% highway, the rest on surface roads — varied driving throughout.
11 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 20.8 mi on Rosemary Straub Davison Highway.
How Hard Is This Drive?
6/10
This route mixes highway mileage with some local-road sections near the start or finish. You will hit about 7 points where you need to pay attention to lane position or signs. The trickiest moment comes early in the drive near Washington Street.
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 36.8 miles you will encounter 7 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: near the start (Washington Street): Navigation decision point; at 3.1 miles (I 270 / Rosemary Straub Davison Highway): Merge point - match speed before joining. Lane positioning matters here; at 23.9 miles: Exit ramp - move to the correct lane early. Lane positioning matters here.
Who Is This Route For?
Weekend Trip
Doable as a same-day drive at 51m. Total distance: 36.8 miles.
Family Friendly
Moderate complexity with 0 natural rest stops along the way.
Solo Traveler
51m drive, comfortable solo distance.
EV Driver
0 DC fast chargers along the route. Coverage: unknown.
First-Time Driver
Mostly highway driving (30%). Some complex stretches to watch for.
Scenic Drive
Mixed highway & surface route profile.
Frequently Asked Questions
The longest stretch is about 20.8 miles on Rosemary Straub Davison Highway. 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 Byrnes Mill, 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: near the start (Washington Street): Navigation decision point; at 3.1 miles (I 270 / Rosemary Straub Davison Highway): Merge point - match speed before joining. Lane positioning matters here; at 23.9 miles: Exit ramp - move to the correct lane early. Lane positioning matters here.
Yes. A round trip is manageable in a single day if you plan a break at Byrnes Mill, 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, and EIA for fuel prices. See our methodology for refresh cadence and limitations.
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