Origin
O'Fallon, MO
Late night in O'Fallon on Tuesday
Local time
3:48 AM
CDT
Current temp
71°F
Unavailable
Live forecast
Trip from O'Fallon, MO to Byrnes Mill, 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
59m
Distance
38.1 mi
61 km
Drive Score
8/10
Great drive
Same Day?
Yes, doable
Fuel Cost
$6
one way
EV Charging
Good
8 stations
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
Wikimedia Commons
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.
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
Where to Stop
Rest stops, refuel points, and overnight suggestions along this route.
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 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.
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 95 decision points cluster between mile 7 and 19.9 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
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.
Fuel & Cost
Regular Gas
$5.96 one way
$11.91 round trip
$3.97/gal
25.4 MPG avg
13 kg CO2
| Fuel Type | $/gal | One Way | Round Trip |
|---|---|---|---|
| midgrade | $4.36 | $6.54 | $13.08 |
| premium | $4.89 | $7.33 | $14.66 |
| diesel | $5.61 | $8.41 | $16.82 |
No toll roads detected on this route.
Drive Cost (one way)
Fuel
$6
Estimated CO2 emission: 13.3 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 | 11.4 | 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
Late night in Byrnes Mill on Tuesday
Local time
3:48 AM
CDT
Current temp
69°F
Unavailable
Live forecast
72°F
Chesterfield, MO
19 mi in
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
2 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.
What kind of drive is this?
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.
37% highway, the rest on surface roads — varied driving throughout.
16 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 12.3 mi on Avenue of the Saints.
How Hard Is This Drive?
7/10
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 7 miles in.
Driving Effort
7/10
Focused - busy navigation packed into a short drive
Balances navigation complexity with total wheel time.
This is a short but busy drive. With 9 decision points packed into just 38.1 miles, you will need to pay attention to lane changes and exits — but the whole thing is over in 59m.
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.
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
About the Cities
Starting in O'Fallon, MO
Full guide →St. Charles, Missouri is outside of St. Louis on the bank of the Missouri River. It was Missouri's first state capital and was one of the first stops by Lewis and Clark on their journey to explore Louisiana Territory. The historic Main Street has largely been restored to its 1812-era appearance including gas lights a boardwalk and is lined with shops selling artwork, handicrafts, home decorations, antiques. There are also many restaurants.
City content from Wikivoyage (CC BY-SA 4.0) and Wikidata (CC0).
Who Is This Route For?
Weekend Trip
Doable as a same-day drive at 59m. Total distance: 38.1 miles.
Family Friendly
Moderate complexity with 0 natural rest stops along the way.
Solo Traveler
59m drive, comfortable solo distance.
EV Driver
0 DC fast chargers along the route. Coverage: unknown.
First-Time Driver
Mostly highway driving (37%). 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 12.3 miles on Avenue of the Saints. 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: 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.
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 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, EIA for fuel prices, USGS 3DEP for elevation, and NPS for national parks. See our methodology for refresh cadence and limitations.
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