Origin
Sullivan, MO
Night in Sullivan on Friday
Local time
9:51 PM
CDT
Current temp
55°F
Unavailable
Live forecast
Trip from Sullivan, MO to O'Fallon, MO
Compiled and reviewed by the Trip.ovh planning team at COD Solutions Oy · Last reviewed Apr 18, 2026 · Editorial standards
Drive Time
1h 26m
Distance
62.1 mi
100 km
Drive Score
9/10
Great drive
Same Day?
Yes, doable
Fuel Cost
$10
one way
EV Charging
Unknown
Best Time to Leave
4 AM
1h 19m
★
6 AM
1h 26m
8 AM
1h 39m
10 AM
1h 31m
12 PM
1h 29m
3 PM
1h 31m
5 PM
1h 39m
8 PM
1h 22m
Estimated drive times based on typical traffic patterns. Actual times may vary with weather, construction, and real-time conditions.
Sullivan, MO
Chris Duan
O'Fallon, MO
Wikimedia Commons
Trip Overview
Sullivan, MO to O'Fallon, MO is 62.1 miles and takes about 1h 26m via I 44 and Manchester Road, with a fuel budget near $10 and enough daylight to finish in a day. This trip stays within the Midwest region and the state of Missouri, offering a straightforward drive. It's a relatively short journey, making it ideal for a quick excursion or an easy segment of a larger road trip. You'll experience a mix of highway speeds and more local road driving, so plan for varying conditions. With only one recommended day, you have plenty of flexibility.
Who Is This Route For?
Weekend Trip
Doable as a same-day drive at 1h 26m. Total distance: 62.1 miles.
Family Friendly
Moderate complexity with 0 natural rest stops along the way.
Solo Traveler
1h 26m drive, comfortable solo distance.
EV Driver
0 DC fast chargers along the route. Coverage: unknown.
First-Time Driver
Mostly highway driving (52%). Some complex stretches to watch for.
Drive Character
This route presents a mixed drive, with 52% of the journey on highways. You'll spend a significant portion on I 44, including a continuous stretch of 27.1 miles. Following that, the route transitions to Manchester Road and MO K, introducing more local traffic and potentially slower speeds. Expect a dynamic driving experience that shifts from efficient highway travel to a more suburban, road-level feel as you approach your destination. This blend means you'll need to adjust your pace and attention throughout the drive.
Expect a mix of faster highway mileage and slower local approaches near the beginning or end.
There are about 32 navigation steps in the underlying route data, so the final approach matters more than the middle miles.
I 44 is the longest continuous segment at about 27.1 miles.
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 early in the drive near West Washington Street.
Driving Effort
8/10
Demanding - plan breaks and stay ahead of the key maneuvers
Balances navigation complexity with total wheel time.
This drive requires moderate attention. Across 62.1 miles you will encounter 20 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 (West Washington Street): Navigation decision point; near the start (West Vine Street): Roundabout - know your exit number before entering; at 0.6 miles (US Historic 66 / West Springfield Road): Navigation decision point.
Critical Maneuvers
5 of 20 key pointsThese are the spots where you need to pay the most attention. Preview them before you drive.
5
0 mi into trip
|
~0m in
|
West Washington Street
Turn right onto West Washington Street
Navigation decision point
6
0 mi into trip
|
~0m in
|
West Vine Street
Enter roundabout onto West Vine Street
Roundabout - know your exit number before entering
5
0.6 mi into trip
|
~1m in
|
US Historic 66 / West Springfield Road
At end of road, turn right onto US Historic 66 / West Springfield Road
Navigation decision point
8
28.8 mi into trip
|
~32m in
Take the exit toward I 44 Business, MO 100 East: Gray Summit
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 253
Toward I 44 Business, MO 100 East: Gray Summit
7
54.6 mi into trip
|
~1h 12m in
Take the exit toward MO K: O'Fallon
Exit ramp - move to the correct lane early. Lane positioning matters here
Use the straight / slight right lanes.
Exit 9
Toward MO K: O'Fallon
Towns Mentioned on Route Signs
Based on OSRM destination-sign hints, not a full list of every settlement the road passes.
On the drive from Sullivan, MO to O'Fallon, MO, road signs begin pointing toward Mo K: O'fallon along the way.
Mo K: O'fallon
54.6 mi in
|
~1h 12m
Main Roads
| Road | Distance | Duration |
|---|---|---|
| I 44 | 27.1 mi | 29m |
| Manchester Road | 13.4 mi | 18m |
| MO K | 6.3 mi | 11m |
| MO 109 | 4.9 mi | 7m |
| Avenue of the Saints | 3.1 mi | 3m |
| South Eatherton Road | 2.4 mi | 4m |
| Olive Street Road | 0.9 mi | 1m |
| West Springfield Road | 0.8 mi | 1m |
Longest stretch:
I 44
— 27.1 mi, about 29m
Turn-by-Turn Driving Directions
Step-by-step road directions between Sullivan, MO and O'Fallon, MO.
1
Start on this road
55 ft
·
6 sec
·
this road
2
Turn right onto West Washington Street
115 ft
·
3 sec
·
West Washington Street
3
Enter roundabout onto West Vine Street
176 ft
·
6 sec
·
West Vine Street
4
Continue on West Vine Street
0.1 mi
·
22 sec
·
West Vine Street
5
Turn left onto South Church Street
0.4 mi
·
56 sec
·
South Church Street
6
At end of road, turn right onto US Historic 66
0.8 mi
·
1 min
·
West Springfield Road
7
Turn left onto MO 185
0.2 mi
·
23 sec
·
MO 185
8
Take the ramp
0.2 mi
·
20 sec
Toward I 44 East: Saint Louis
9
Merge onto I 44
27 mi
·
29 min
·
I 44
10
Take the exit
0.2 mi
·
27 sec
Exit 253
Toward I 44 Business, MO 100 East: Gray Summit
Use the slight right lane.
11
Turn left onto MO 100
13 mi
·
18 min
·
Manchester Road
Use the straight lane.
12
Take the exit
0.2 mi
·
30 sec
Toward MO 109
13
Enter roundabout onto MO 109
224 ft
·
4 sec
·
MO 109
14
Continue on MO 109
515 ft
·
10 sec
·
MO 109
15
Enter roundabout onto MO 109
98 ft
·
1 sec
·
MO 109
16
Continue on MO 109
0.4 mi
·
45 sec
·
MO 109
17
Enter roundabout onto MO 109
94 ft
·
2 sec
·
MO 109
18
Continue on MO 109
4.3 mi
·
6 min
·
MO 109
19
Enter roundabout onto South Eatherton Road
94 ft
·
1 sec
·
South Eatherton Road
20
Continue on South Eatherton Road
2.4 mi
·
4 min
·
South Eatherton Road
21
Continue on Olive Street Road
0.9 mi
·
1 min
·
Olive Street Road
22
Take the ramp onto Chesterfield Airport Road
0.7 mi
·
1 min
·
Chesterfield Airport Road
23
Merge onto I 64; US 40; US 61
3.1 mi
·
3 min
·
Avenue of the Saints
Use the straight lane.
24
Take the exit
327 ft
·
6 sec
Exit 9
Toward MO K: O'Fallon
Use the straight / slight right lanes.
25
Merge onto North Outer Road
0.3 mi
·
31 sec
·
North Outer Road
26
Continue on North Outer Road
0.2 mi
·
17 sec
·
North Outer Road
27
Turn right onto MO K
3.3 mi
·
5 min
·
MO K
28
Continue on MO K
1.5 mi
·
2 min
·
MO K
Use the right lane.
29
Continue on MO K
1.6 mi
·
3 min
·
MO K
Use the right lane.
30
Continue on South Main Street
0.6 mi
·
1 min
·
South Main Street
31
Turn right
25 ft
·
1 sec
32
Arrive at destination
Where to Stop
Rest stops, refuel points, and overnight suggestions along this route.
Halfway Point
Midpoint
About 31.1 mi from Sullivan, MO · 36m into the drive
Mid-route town
Meal stop
31 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 14 miles helps settle the day before fatigue starts building.
Meal break
The midpoint is around 31.1 miles from Sullivan, MO, which is a good place for a longer meal and fuel stop.
Arriving in O'Fallon, MO
The final approach into O'Fallon, MO usually feels slower than the middle of the drive, so avoid planning your tightest schedule at the very end.
These stop ideas are pacing suggestions — the exact town or exit can change with traffic, hotel plans, and fuel range.
Fuel & Cost
Regular Gas
$9.71 one way
$19.42 round trip
$3.97/gal
25.4 MPG avg
22 kg CO2
| Fuel Type | $/gal | One Way | Round Trip |
|---|---|---|---|
| midgrade | $4.36 | $10.66 | $21.32 |
| premium | $4.89 | $11.95 | $23.90 |
| diesel | $5.61 | $13.71 | $27.42 |
No toll roads detected on this route.
Drive Cost (one way)
Fuel
$10
Estimated CO2 emission: 21.7 kg one way. Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $7 in charging · 0 stops · 68% less CO2
| Vehicle Type | kWh | Stops | DC Fast | Home Charge |
|---|---|---|---|---|
| Average EV | 18.6 | 0 | $6.52 | $2.98 |
| Efficient EV | 15.5 | 0 | $5.43 | $2.48 |
| EV Truck/SUV | 24.8 | 0 | $8.69 | $3.97 |
Gas CO2
22 kg
EV CO2
7 kg (68% 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
O'Fallon, MO
Night in O'Fallon on Friday
Local time
9:51 PM
CDT
Current temp
57°F
Unavailable
Live forecast
75°F
Wildwood, MO
31 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 warmer at arrival
A meaningful temperature swing is a good cue to rethink layers, water, and how soon you want to arrive.
Road read
1h 26m 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 Sullivan, MO to O'Fallon, MO covers 62.1 miles and takes about 1h 26m without stops. Add 15-30 minutes for a fuel or rest stop on longer drives.
The main roads are I 44, Manchester Road, MO K. Expect a mix of highway and local road driving.
This is a comfortable same-day trip.
The midpoint is about 31.1 miles from Sullivan, MO. Look for rest areas, gas stations, or food options near the halfway mark.
At current regular gas prices, expect to spend about $9.71 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 drive requires moderate attention. Across 62.1 miles you will encounter 20 spots where lane choice or exit timing matters. Not difficult for experienced highway drivers, but worth previewing the tricky sections before you go.
The main spots that need attention: near the start (West Washington Street): Navigation decision point; near the start (West Vine Street): Roundabout - know your exit number before entering; at 0.6 miles (US Historic 66 / West Springfield Road): Navigation decision point.
On the drive from Sullivan, MO to O'Fallon, MO, road signs begin pointing toward Mo K: O'fallon along the way.
How this page is built
Compiled by the Trip.ovh 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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