O'Fallon, MO to Carl Junction, MO is 288.4 miles and takes about 5h 32m via I 44 and MO 100, with a fuel budget near $45 and enough daylight to finish in a day. This trip stays within the Midwest region, primarily traversing Missouri. Given its mostly highway profile and manageable duration, it's a straightforward day trip. You'll spend the bulk of your time on the interstate, making it an efficient way to cover the distance. Consider this route if you need a direct connection between these two points without much fuss.
Trip Pace
Same-day drive is realistic
A same-day return is possible, but it will make for a full day on the road.
Break Rhythm
1 planned break
Plan on a short reset every 3 to 4 hours to stay fresh behind the wheel.
Midpoint
144.2 miles from O'Fallon, MO
A natural place for your longest stop of the day
, about 2h 52m into the drive
.
Main Roads
Road
Distance
Duration
I 44
240.9 mi
4h 19m
MO 100
13.3 mi
18m
MO K
6.5 mi
11m
Governor Warren E Hearnes Memorial Highway
5 mi
5m
MO 109
4.7 mi
7m
Avenue of the Saints
3.7 mi
4m
Demott Drive
3.1 mi
4m
North Eatherton Road
2.4 mi
4m
Longest stretch:
I 44
— 240.9 mi, about 4h 19m
Traffic on I-44
Hour-of-day weekday pattern from 8 FHWA count stations on your route.
Peak
4 PM
~1,432 veh/hr typical
· worst 1,709
Quietest
2 AM
~177 veh/hr
Peak-to-quiet ratio
8.1×
busier at peak than in the quiet hours
12a6anoon6p11p
Averaged across 52 weeks of 2023 FHWA Travel Monitoring Analysis System data. Weekday hours only (Mon–Fri).
Turn-by-Turn Driving Directions
Step-by-step road directions between O'Fallon, MO and Carl Junction, 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 SouthUse the slight right lane.
6
Merge onto I 64; US 40; US 61
3.7 mi·4 min·Avenue of the Saints
7
Take the exit
0.5 mi·57 sec
Exit 14Toward Chesterfield Airport RoadUse the slight right lane.
8
Continue on Chesterfield Airport Road
361 ft·6 sec·Chesterfield Airport Road
9
Turn right
211 ft·5 sec
Toward Olive Street Road
10
Turn right onto Olive Street Road
0.9 mi·1 min·Olive Street Road
11
Continue on North Eatherton Road
2.4 mi·4 min·North Eatherton Road
12
Enter roundabout onto MO 109
70 ft·1 sec·MO 109
13
Continue on MO 109
4.3 mi·6 min·MO 109
14
Enter roundabout onto MO 109
94 ft·2 sec·MO 109
15
Continue on MO 109
0.4 mi·44 sec·MO 109
16
Enter roundabout
76 ft·1 sec
Toward MO 100 West: Gray Summit
17
Continue
0.2 mi·32 sec
Toward MO 100 West: Gray Summit
18
Merge onto MO 100
13 mi·18 min·MO 100
19
Take the exit
0.2 mi·14 sec
Toward I 44 West, US 50 West: St. Clair
20
Merge onto I 44; US 50
241 mi·4 hr 19 min·I 44; US 50
Use the straight lane.
21
Take the exit onto I 49; US 71
0.3 mi·24 sec·I 49; US 71
Exit 11Toward I 49 South, US 71 South, MO 249 North: Neosho, Fort Smith
22
Keep slight right at fork
0.2 mi·21 sec
Toward MO 249 North
23
Merge onto MO 249
5.0 mi·5 min·Governor Warren E Hearnes Memorial Highway
24
Take the exit
0.6 mi·38 sec
Toward I 49 Business, MO 171 North: Webb City
25
Merge onto I 49 Business; MO 171
0.6 mi·46 sec·I 49 Business; MO 171
Toward I 49 Business, MO 171 North: Webb City
26
Enter roundabout onto I 49 Business; MO 171
235 ft·3 sec·East MacArthur Drive
27
Continue on I 49 Business; MO 171
0.9 mi·1 min·East MacArthur Drive
28
Continue on MO 171
2.0 mi·3 min·West Macarthur Drive
29
Enter roundabout onto MO 171
131 ft·2 sec·Demott Drive
30
Continue on MO 171
3.1 mi·4 min·Demott Drive
31
Turn left onto MO Z
1.3 mi·2 min·East Pennell Street
32
Arrive at destination
MO Z
Trip Plan
To make the most of this 5h 32m drive, aim for an early morning departure from O'Fallon, MO, to avoid potential traffic. With a fuel cost estimate of $45, it's wise to fill up before you leave or at a major exit along I 44. The longest stretch without a significant road change is 240.9 miles on I 44, so plan your primary stop for fuel or a break around the halfway point of that segment. You'll have one main highway to follow for most of the trip, but be prepared for the change to MO 100 and MO K as you get closer to Carl Junction.
Morning Departure
An early start around 7-8 AM gets you there with plenty of daylight left.
Evening Departure
A late afternoon start means arriving after dark. Morning is better.
You can normally do this drive in one day.
Plan roughly 1 meaningful break for fuel, food, and rest.
The halfway point lands around 144.2 miles from O'Fallon, MO, or about 2h 52m into the drive.
The longest continuous stretch on this route runs about 240.9 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 63 miles or 1h 24m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 144.2 miles or 2h 52m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Final approach
Final hour starts around 4h 31m
Traffic, exits, and arrival timing usually matter more near Carl Junction, 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 288.4 miles and 5h 32m.
Your first comfortable stop window is around 63 miles from O'Fallon, MO.
This route can stay practical as a one-day drive if traffic stays reasonable.
Plan about 1 real break rather than only quick fuel stops.
The longest stretch is on I 44 for about 240.9 miles.
Where to Stop
Rest stops, refuel points, and overnight suggestions along this route.
Place data sourced from public business listings. Hours and availability may vary.
Heads-up: tricky spots
5 of 21
5 decision points cluster between mile 7 and 274.7 — 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
7
11 mi into trip|~17m in
Take the exit toward Chesterfield Airport Road
Exit ramp - move to the correct lane early. Lane positioning matters here
Use the slight right lane.
Exit 14
Toward Chesterfield Airport Road
5
19.7 mi into trip|~33m in
Enter roundabout toward MO 100 West: Gray Summit
Roundabout - know your exit number before entering
Toward MO 100 West: Gray Summit
6
274.4 mi into trip|~5h 12m in|I 49; US 71
Take the exit onto I 49; US 71 toward I 49 South, US 71 South, MO 249 North: Neosho, Fort Smith
Exit ramp - move to the correct lane early. Multiple destination signs - pick the right one
Exit 11
Toward I 49 South, US 71 South, MO 249 North: N...
6
274.7 mi into trip|~5h 13m in
Keep slight right at fork toward MO 249 North
Highway fork - watch signs carefully
Toward MO 249 North
Fuel & Cost
Regular Gas
$42.59 one way
$85.18 round trip
$3.75/gal25.4 MPG avg101 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.14
$47.02
$94.04
premium
$4.72
$53.55
$107.09
diesel
$4.80
$54.46
$108.91
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$43
Meals
$25–$50
Total
$68–$93
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 100.9 kg one way.
Prices: EIA weekly data, 2026-07-13.
Driving Electric?
About $30 in charging
· 1 stop
· 66% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
86.5
1
$30.28
$13.84
Efficient EV
72.1
0
$25.24
$11.54
EV Truck/SUV
115.4
1
$40.38
$18.46
Gas CO2
101 kg
EV CO2
34 kg (66% less)
Plan for 1 charging stop. A 30-minute DC fast charge mid-route should be enough to complete the trip comfortably.
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.
Forecast as of Jul 18, 2026
Origin
O'Fallon, MO
Morning
in O'Fallon on Sunday
Local time
9:41 AM
CDT
Current temp
75°F
Slight Chance Showers And Thunderstorms then Mostly Clear
W 6 mph18% chanceLive forecast
Special Weather Statement
Special Weather Statement issued July 17 at 2:27PM CDT by NWS Quad Cities IA IL
Special Weather Statement
Special Weather Statement issued July 17 at 2:25PM CDT by NWS Quad Cities IA IL
Destination
Carl Junction, MO
Morning
in Carl Junction on Sunday
Local time
9:41 AM
CDT
Current temp
73°F
Isolated Showers And Thunderstorms then Partly Cloudy
S 6 to 12 mph20% chanceLive forecast
Special Weather Statement
Special Weather Statement issued July 17 at 2:27PM CDT by NWS Quad Cities IA IL
Special Weather Statement
Special Weather Statement issued July 17 at 2:25PM CDT by NWS Quad Cities IA IL
89°F
Cuba, MO
144 mi in
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
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
5h 32m on the road
An early start around 7-8 AM gets you there with plenty of daylight left.
Weather data from the National Weather Service. Conditions may change; check closer to your travel date.
National Parks Near This Route
Worth a detour if your schedule allows.
George Washington Carver National Monument
National Monument
The young child known as the "Plant Doctor" tended his secret garden while observing the day-to-day operations of a 19th century farm. Nature and nurture ultimately influenced George on his quest for...
7 mi from route
~17 min detour
Free
near mile 268.5
Wilson's Creek was the first major Civil War battle fought west of the Mississippi River, and where the first Union general was killed in action. The costly Southern victory on August 10, 1861, focuse...
7 mi from route
~18 min detour
Free
near mile 218.8
Gateway Arch National Park commemorates President Jefferson’s vision of a continental nation, the individuals and cultural groups who helped shape its history, St. Louis’ role in westward expansion, a...
25 mi from route
~62 min detour
$19
near mile 19.9
Park data from the National Park Service API. Alerts update every 2 hours.
More Details
What kind of drive is this?
This drive is predominantly highway, with 90% of the 288.4 miles on interstates like I 44. You'll experience a long stretch of 240.9 miles on I 44 before transitioning to surface roads like MO 100 and MO K. Expect frequent exits and an urban feel for much of the interstate portion, which will eventually give way to more rural cruising as you near your destination.
90% highway — fuel and pacing are the main things to plan.
32 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 240.9 mi on I 44.
How Hard Is This Drive?
7/10
This is a straightforward highway drive that stays mostly on I 44 and MO 100. This route has several spots where lane changes, forks, or exits need your full attention. The trickiest moment comes around 7 miles in.
Driving Effort7/10
Demanding - plan breaks and stay ahead of the key maneuvers
Balances navigation complexity with total wheel time.
This is a demanding drive. With 21 significant decision points across 288.4 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 11 miles: Exit ramp - move to the correct lane early. Lane positioning matters here; at 19.7 miles: Roundabout - know your exit number before entering.
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.
Doable as a same-day drive at 5h 32m. Total distance: 288.4 miles.
Family Friendly
Moderate complexity with 1 natural rest stops along the way.
Solo Traveler
5h 32m drive, comfortable solo distance.
First-Time Driver
Mostly highway driving (90%). Some complex stretches to watch for.
Frequently Asked Questions
The longest stretch is about 240.9 miles on I 44. The full list of main roads is in the Roads section above.
Yes — we found about 28 rest areas or service plazas within a short detour of the route (from OpenStreetMap). See the Rest Stops tab under Nearby Places for locations and mile markers. Plan to stretch, use the bathroom, and top off fluids every 2–3 hours on longer drives.
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 Carl Junction, MO before sunset when you can. Check the Trip Plan for departure windows that land you in daylight.
Only with planning. This is a long drive for kids — consider splitting it into two days rather than pushing through. Plan at least 1 meaningful breaks. There are 28 rest areas along the route for bathroom stops.
The main spots that need attention: at 7 miles: Lane positioning matters here. Multiple destination signs - pick the right one; at 11 miles: Exit ramp - move to the correct lane early. Lane positioning matters here; at 19.7 miles: Roundabout - know your exit number before entering.
Yes — George Washington Carver National Monument, Wilson's Creek National Battlefield and Gateway Arch National Park. See the National Parks section for detour distances and tips on detours.
Not recommended in a single day. At 5.5 hours each way, a round trip means 11.1 hours of driving — that is an unsafe level of fatigue for most drivers. Plan at least one night at Carl Junction, MO before the return drive.
