Origin
O'Fallon, MO
Afternoon in O'Fallon on Sunday
Local time
3:47 PM
CDT
Current temp
53°F
Unavailable
Live forecast
Trip from O'Fallon, MO to Byrnes Mill, MO
Drive Time
59m
Distance
38.1 mi
61 km
Drive Score
8/10
Great drive
Same Day?
Yes, doable
Fuel Cost
$6
one way
EV Charging
Loading...
station data
Best Time to Leave
4 AM
0h 55m
★
6 AM
0h 59m
8 AM
1h 9m
10 AM
1h 3m
12 PM
1h 2m
3 PM
1h 3m
5 PM
1h 8m
8 PM
0h 56m
Estimated drive times based on typical traffic patterns. Actual times may vary with weather, construction, and real-time conditions.
O'Fallon, MO
Valeria Boltneva
Byrnes Mill, MO
Valeria Boltneva
Trip Overview
This 38.1-mile journey from O'Fallon to Byrnes Mill serves as a straightforward day trip within the Missouri Midwest. Expect to spend about 59 minutes behind the wheel, making it a highly efficient route for those traveling between these two points. With a fuel budget of just $6, this is a budget-friendly excursion that doesn't require an overnight stay. You will navigate via South Main Street, I-64 East, and the Avenue of the Saints. It is a practical drive that gets you to your destination quickly, leaving you with plenty of time to enjoy your day once you arrive.
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
19.1 miles from O'Fallon, MO
A natural place for your longest stop of the day , about 27m into the drive .
Drive Character
Expect a turn-heavy local drive that demands your full attention rather than a monotonous interstate cruise. Since the highway share is 0%, you won't be spending much time at high speeds on wide-open expressways. Instead, the route transitions through a series of local roads that require frequent navigation and adjustments. Because there are no long, uninterrupted stretches, you should be prepared for a drive that feels more like a local commute than a cross-country haul. The road's personality is defined by its constant shifts and turns, keeping the experience engaging from start to finish.
Expect a mix of faster highway mileage and slower local approaches near the beginning or end.
There are about 16 navigation steps in the underlying route data, so the final approach matters more than the middle miles.
Avenue of the Saints is the longest continuous segment at about 12.3 miles.
Elevation Profile
Mostly flat terrain
803 ft
462 ft
Total Climb
554 ft
Total Descent
297 ft
Highest Point
803 ft
~33.4 mi in
Elevation Range
341 ft
How Hard Is This Drive?
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 7 miles in.
Route Complexity
7/10
Demanding - plan breaks and stay ahead of the key maneuvers
This is a demanding drive. With 9 significant decision points across 38.1 miles, you will need to stay alert — especially through interchange areas and urban stretches. Consider splitting it into segments if you are not comfortable with fast highway navigation.
Where does it get tricky?
The main spots that need attention: at 7 miles: Lane positioning matters here. Multiple destination signs - pick the right one; at 7.3 miles (I 64; US 40; US 61 / Avenue of the Saints): Merge point - match speed before joining. Lane positioning matters here; at 19.6 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.
6
7 mi into trip
|
~12m in
Take the ramp toward I 64 East, US 40 East, US 61 South
Lane positioning matters here. Multiple destination signs - pick the right one
Use the slight right lane.
Toward I 64 East, US 40 East, US 61 South
5
7.3 mi into trip
|
~13m in
|
I 64; US 40; US 61 / Avenue of the Saints
Merge onto I 64; US 40; US 61 / Avenue of the Saints
Merge point - match speed before joining. Lane positioning matters here
Use the straight lane.
7
19.6 mi into trip
|
~28m in
Take the exit toward MO 141
Exit ramp - move to the correct lane early. Lane positioning matters here
Use the slight right lane.
Exit 22
Toward MO 141
5
19.8 mi into trip
|
~29m in
Turn right toward MO 141: Manchester
Navigation decision point
Toward MO 141: Manchester
5
19.9 mi into trip
|
~29m in
|
MO 141
Merge onto MO 141
Merge point - match speed before joining. Lane positioning matters here
Use the right lane.
Main Roads
| Road | Distance | Duration |
|---|---|---|
| Avenue of the Saints | 12.3 mi | 15m |
| MO 141 | 8.5 mi | 13m |
| MO K | 6.5 mi | 11m |
| MO 30 | 5.6 mi | 7m |
| Hawkins Road | 1.6 mi | 3m |
| Upper Byrnes Mill Road | 1.4 mi | 3m |
| New Sugar Creek Road | 1 mi | 1m |
| South Main Street | 0.5 mi | 1m |
Longest stretch:
Avenue of the Saints
— 12.3 mi, about 15m
Turn-by-Turn Driving Directions
Step-by-step road directions between O'Fallon, MO and Byrnes Mill, MO.
1
Start on this road
25 ft
·
7 sec
·
this road
2
Turn left onto South Main Street
0.5 mi
·
1 min
·
South Main Street
3
Continue on MO K
3.1 mi
·
5 min
·
MO K
Use the left lane.
4
Continue on MO K
3.4 mi
·
5 min
·
MO K
Use the straight lane.
5
Take the ramp
0.3 mi
·
21 sec
Toward I 64 East, US 40 East, US 61 South
Use the slight right lane.
6
Merge onto I 64; US 40; US 61
12 mi
·
15 min
·
Avenue of the Saints
Use the straight lane.
7
Take the exit
0.3 mi
·
33 sec
Exit 22
Toward MO 141
Use the slight right lane.
8
Turn right
185 ft
·
5 sec
Toward MO 141: Manchester
9
Merge onto MO 141
8.5 mi
·
13 min
·
MO 141
Use the right lane.
10
Turn right onto Hawkins Road
1.6 mi
·
3 min
·
Hawkins Road
11
Continue on New Sugar Creek Road
1.0 mi
·
1 min
·
New Sugar Creek Road
12
Take the ramp
182 ft
·
2 sec
Toward MO 30 West
13
Merge onto MO 30
5.6 mi
·
7 min
·
MO 30
14
Take the exit
109 ft
·
3 sec
Toward Upper Byrnes Mill Road
15
Turn slight right onto Upper Byrnes Mill Road
1.4 mi
·
3 min
·
Upper Byrnes Mill Road
16
Arrive at destination
Upper Byrnes Mill Road
Trip Plan
Because this is a short, sub-one-hour trip, you have significant flexibility in your departure time. You won't need to plan for any major stops along the way, but keep in mind that the turn-heavy nature of the route means you should stay alert throughout the 38.1-mile trek. Since you won't be hitting long highway segments, it is wise to ensure your vehicle is ready for frequent navigation and shifting speeds. Budgeting $6 for fuel is more than enough for this distance, allowing you to focus your resources on your destination. Use your time wisely by checking local traffic conditions on South Main Street before you head out to ensure the smoothest possible transition between regions.
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.
You can normally do this drive in one day.
You may only need one short stretch break if traffic stays light.
The halfway point lands around 19.1 miles from O'Fallon, MO, or about 27m into the drive.
The longest continuous stretch on this route runs about 12.3 miles.
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 38.1 miles or 59m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 19.1 miles or 27m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Final approach
Final hour starts around 50m
Traffic, exits, and arrival timing usually matter more near Byrnes Mill, MO than in the middle of the route.
Before You Leave
+
Open the route before leaving O'Fallon, 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 O'Fallon, MO
This is one driving day of about 38.1 miles and 59m.
Your first comfortable stop window is around 80 miles from O'Fallon, MO.
This route can stay practical as a one-day drive if traffic stays reasonable.
You may only need one short stretch stop if conditions stay smooth.
The longest stretch is on Avenue of the Saints for about 12.3 miles.
Where to Stop
Rest stops, refuel points, and overnight suggestions along this route.
Halfway Point
Midpoint
About 19.1 mi from O'Fallon, MO · 27m into the drive
Mid-route town
Meal stop
19 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 38.1 miles helps settle the day before fatigue starts building.
Meal break
The midpoint is around 19.1 miles from O'Fallon, MO, which is a good place for a longer meal and fuel stop.
Arriving in Byrnes Mill, MO
The final approach into Byrnes Mill, 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 Byrnes Mill, MO.
These stop ideas are pacing suggestions — the exact town or exit can change with traffic, hotel plans, and fuel range.
Fuel & Cost
Regular Gas
$5.79 one way
$11.57 round trip
$3.86/gal
25.4 MPG avg
13 kg CO2
| Fuel Type | $/gal | One Way | Round Trip |
|---|---|---|---|
| midgrade | $4.25 | $6.38 | $12.76 |
| premium | $4.80 | $7.19 | $14.39 |
| diesel | $5.64 | $8.46 | $16.93 |
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$6
Meals
$25–$50
Total
$31–$56
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 13.3 kg one way. Prices: EIA weekly data, 2026-04-06.
Driving Electric?
About $4 in charging · 0 stops · 69% less CO2
| Vehicle Type | kWh | Stops | DC Fast | Home Charge |
|---|---|---|---|---|
| Average EV | 11.4 | 0 | $4.00 | $1.83 |
| Efficient EV | 9.5 | 0 | $3.33 | $1.52 |
| EV Truck/SUV | 15.2 | 0 | $5.33 | $2.44 |
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
Afternoon in Byrnes Mill on Sunday
Local time
3:47 PM
CDT
Current temp
44°F
Unavailable
Live forecast
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
Same local time
Origin and destination are on the same clock, so arrival timing is easier to judge at a glance.
Temperature spread
9 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
59m 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 O'Fallon, MO to Byrnes Mill, MO covers 38.1 miles and takes about 59m without stops. Add 15-30 minutes for a fuel or rest stop on longer drives.
The main roads are Avenue of the Saints, MO 141, MO K. Expect a mix of highway and local road driving.
This is a comfortable same-day trip.
The midpoint is about 19.1 miles from O'Fallon, MO. Look for rest areas, gas stations, or food options near the halfway mark.
At current regular gas prices, expect to spend about $5.79 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 is a demanding drive. With 9 significant decision points across 38.1 miles, you will need to stay alert — especially through interchange areas and urban stretches. Consider splitting it into segments if you are not comfortable with fast highway navigation.
The main spots that need attention: at 7 miles: Lane positioning matters here. Multiple destination signs - pick the right one; at 7.3 miles (I 64; US 40; US 61 / Avenue of the Saints): Merge point - match speed before joining. Lane positioning matters here; at 19.6 miles: Exit ramp - move to the correct lane early. Lane positioning matters here.
The route from O'Fallon, MO to Byrnes Mill, MO does not surface many named destination signs beyond the main corridor.
Was this route helpful?
Thanks for your feedback!
Your tip has been submitted. Thanks!
/500
Recent Tips
·
Explore More
Continue From Byrnes Mill, MO
More trips to Byrnes Mill, MO
Explore more options from O'Fallon, MO or browse trips ending in Byrnes Mill, MO.
Looking for more statewide routes? Browse MO road trips.
Explore maps for O'Fallon, MO or Byrnes Mill, MO on MapSof.net.