Traveling from Saint Peters to Carl Junction covers 291.9 miles across Missouri, a journey that typically takes 5 hours and 35 minutes of driving time. Because this route stays within the Midwest, you will experience consistent regional landscapes as you head southwest. With a total estimated fuel cost of $44, it is an affordable trip that can easily be completed in a single day. You will primarily navigate via I-44, MO-100, and MO-K, making this a straightforward highway-focused excursion. Whether you are heading out for business or visiting family, this drive is efficient enough that you won't need to worry about booking an overnight stay unless you prefer a slower pace.
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
145.9 miles from Saint Peters, MO
A natural place for your longest stop of the day
, about 2h 54m 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
I 70
3 mi
3m
Longest stretch:
I 44
— 240.9 mi, about 4h 19m
Turn-by-Turn Driving Directions
Step-by-step road directions between Saint Peters, MO and Carl Junction, MO.
1
Start on I 70
3.0 mi·3 min·I 70
Use the straight / slight right lanes.
2
Take the exit
390 ft·8 sec
Exit 218Toward MO K: O'Fallon, Main StreetUse the slight right lane.
3
Turn straight onto East Terra Lane
0.9 mi·1 min·East Terra Lane
Use the straight lane.
4
Turn slight left
61 ft·1 sec
5
Continue on MO K
3.1 mi·5 min·MO K
Use the left lane.
6
Continue on MO K
3.4 mi·5 min·MO K
Use the straight lane.
7
Take the ramp
0.3 mi·21 sec
Toward I 64 East, US 40 East, US 61 SouthUse the slight right lane.
8
Merge onto I 64; US 40; US 61
3.7 mi·4 min·Avenue of the Saints
9
Take the exit
0.5 mi·57 sec
Exit 14Toward Chesterfield Airport RoadUse the slight right lane.
10
Continue on Chesterfield Airport Road
361 ft·6 sec·Chesterfield Airport Road
11
Turn right
211 ft·5 sec
Toward Olive Street Road
12
Turn right onto Olive Street Road
0.9 mi·1 min·Olive Street Road
13
Continue on North Eatherton Road
2.4 mi·4 min·North Eatherton Road
14
Enter roundabout onto MO 109
70 ft·1 sec·MO 109
15
Continue on MO 109
4.3 mi·6 min·MO 109
16
Enter roundabout onto MO 109
94 ft·2 sec·MO 109
17
Continue on MO 109
0.4 mi·44 sec·MO 109
18
Enter roundabout
76 ft·1 sec
Toward MO 100 West: Gray Summit
19
Continue
0.2 mi·32 sec
Toward MO 100 West: Gray Summit
20
Merge onto MO 100
13 mi·18 min·MO 100
21
Take the exit
0.2 mi·14 sec
Toward I 44 West, US 50 West: St. Clair
22
Merge onto I 44; US 50
241 mi·4 hr 19 min·I 44; US 50
Use the straight lane.
23
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
24
Keep slight right at fork
0.2 mi·21 sec
Toward MO 249 North
25
Merge onto MO 249
5.0 mi·5 min·Governor Warren E Hearnes Memorial Highway
26
Take the exit
0.6 mi·38 sec
Toward I 49 Business, MO 171 North: Webb City
27
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
28
Enter roundabout onto I 49 Business; MO 171
235 ft·3 sec·East MacArthur Drive
29
Continue on I 49 Business; MO 171
0.9 mi·1 min·East MacArthur Drive
30
Continue on MO 171
2.0 mi·3 min·West Macarthur Drive
31
Enter roundabout onto MO 171
131 ft·2 sec·Demott Drive
32
Continue on MO 171
3.1 mi·4 min·Demott Drive
33
Turn left onto MO Z
1.3 mi·2 min·East Pennell Street
34
Arrive at destination
MO Z
Trip Plan
To keep your drive manageable, aim for at least one planned stop to break up the 5.5-hour duration. Since the longest uninterrupted segment spans over 240 miles, prioritize refueling before you fully commit to the I-44 corridor to avoid any mid-trip stress. Departing early in the morning is your best strategy to avoid potential traffic congestion and ensure you reach Carl Junction before the day ends. Given the flexibility of a one-day trip, feel free to adjust your departure time to suit your personal schedule. Keep an eye on your fuel gauge throughout the journey, as the $44 estimate may fluctuate based on current gas prices and your vehicle's specific efficiency.
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 145.9 miles from Saint Peters, MO, or about 2h 54m 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 64 miles or 1h 25m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 145.9 miles or 2h 54m 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 35m
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 Saint Peters, 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 Saint Peters, MO
This is one driving day of about 291.9 miles and 5h 35m.
Your first comfortable stop window is around 64 miles from Saint Peters, 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 24
5 decision points cluster between mile 3 and 278.1 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
8
3 mi into trip|~3m in
Take the exit toward MO K: O'Fallon, Main Street
Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one
Use the slight right lane.
Exit 218
Toward MO K: O'Fallon, Main Street
6
10.5 mi into trip|~16m 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
14.5 mi into trip|~21m 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
6
277.9 mi into trip|~5h 16m 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
278.1 mi into trip|~5h 17m in
Keep slight right at fork toward MO 249 North
Highway fork - watch signs carefully
Toward MO 249 North
Fuel & Cost
Regular Gas
$45.64 one way
$91.27 round trip
$3.97/gal25.4 MPG avg102 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.36
$50.11
$100.21
premium
$4.89
$56.17
$112.35
diesel
$5.61
$64.45
$128.90
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$46
Meals
$25–$50
Total
$71–$96
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 102.1 kg one way.
Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $31 in charging
· 1 stop
· 67% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
87.6
1
$30.65
$14.01
Efficient EV
73
0
$25.54
$11.68
EV Truck/SUV
116.8
1
$40.87
$18.68
Gas CO2
102 kg
EV CO2
34 kg (67% 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 Apr 17, 2026
Origin
Saint Peters, MO
Night
in Saint Peters on Saturday
Local time
9:49 PM
CDT
Current temp
60°F
Partly Cloudy
S 5 mph1% chanceLive forecast
Destination
Carl Junction, MO
Night
in Carl Junction on Saturday
Local time
9:49 PM
CDT
Current temp
57°F
Unavailable
Live forecast
74°F
Washington, MO
146 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
3 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 35m 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 271.7
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
~17 min detour
Free
near mile 221.4
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
~63 min detour
$19
near mile 20.1
Park data from the National Park Service API. Alerts update every 2 hours.
More Details
What kind of drive is this?
Expect a high-speed experience, as 90% of this journey is spent on major highways. You will settle into a long, steady rhythm during the 240.9-mile stretch on I-44, which serves as the backbone of your trip. While the route begins with local transitions on MO-100 and MO-K, the majority of your time is dedicated to interstate travel. The road maintains a practical, highway-focused profile that prioritizes speed and directness over winding scenic detours. You should be prepared for a consistent driving pace that allows you to cover significant ground quickly.
90% highway — fuel and pacing are the main things to plan.
34 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?
8/10
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 3 miles in.
Driving Effort8/10
Demanding - plan breaks and stay ahead of the key maneuvers
Balances navigation complexity with total wheel time.
This is a demanding drive. With 24 significant decision points across 291.9 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 3 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one; at 10.5 miles: Lane positioning matters here. Multiple destination signs - pick the right one; at 14.5 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 5h 35m. Total distance: 291.9 miles.
Family Friendly
Moderate complexity with 1 natural rest stops along the way.
Solo Traveler
5h 35m 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.
We did not find dedicated rest areas on this route. For a drive this long, plan bathroom and stretch breaks around gas stations, fast-food stops, or small-town downtowns — check the Nearby Places section for options.
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. Dedicated rest areas are limited, so plan gas or food stops as your bathroom breaks.
The main spots that need attention: at 3 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one; at 10.5 miles: Lane positioning matters here. Multiple destination signs - pick the right one; at 14.5 miles: Exit ramp - move to the correct lane early. Lane positioning matters here.
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 5.6 hours each way, a round trip means 11.2 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.
