Origin
Sainte Genevieve, MO
Late night in Sainte Genevieve on Sunday
Local time
2:36 AM
CDT
Current temp
56°F
Unavailable
Live forecast
Trip from Sainte Genevieve, MO to O'Fallon, MO
Compiled and reviewed by the US Trip Planner planning team at COD Solutions Oy · Last reviewed Apr 19, 2026 · Editorial standards
Drive Time
1h 47m
Distance
86.4 mi
139 km
Drive Score
7/10
Good drive
Same Day?
Yes, doable
Fuel Cost
$14
one way
EV Charging
Unknown
Best Time to Leave
4 AM
1h 40m
★
6 AM
1h 48m
8 AM
2h 4m
10 AM
1h 53m
12 PM
1h 52m
3 PM
1h 54m
5 PM
2h 3m
8 PM
1h 43m
Estimated drive times based on typical traffic patterns. Actual times may vary with weather, construction, and real-time conditions.
Sainte Genevieve, MO
Jermaine Lewis
O'Fallon, MO
Wikimedia Commons
Trip Overview
Sainte Genevieve to O'Fallon is 86.4 miles and takes about 1h 47m via I-55 and I-270, with a fuel budget near $14 and enough daylight to finish in a day. This drive stays within Missouri, traversing the Midwest region. It's a straightforward highway-focused trip, best suited for those looking for efficient travel between these two points. Consider this route for a quick connection, without extensive detours or complex navigation, making it ideal for a single-day journey.
Trip Pace
Same-day drive is realistic
A same-day return is realistic if you keep stops short.
Midpoint
43.2 miles from Sainte Genevieve, MO
A natural place for your longest stop of the day , about 52m into the drive .
Main Roads
| Road | Distance | Duration |
|---|---|---|
| I 55 | 40 mi | 43m |
| I 270 | 18.1 mi | 22m |
| I 70 | 13.6 mi | 16m |
| US 61 | 7.3 mi | 10m |
| Rosa Parks Highway | 1.3 mi | 1m |
| Market Street | 1 mi | 2m |
| East Terra Lane | 0.9 mi | 1m |
| South Main Street | 0.5 mi | 1m |
Longest stretch:
I 55
— 40 mi, about 43m
Turn-by-Turn Driving Directions
Step-by-step road directions between Sainte Genevieve, MO and O'Fallon, MO.
1
Start on Jefferson Street
435 ft
·
24 sec
·
Jefferson Street
2
Turn left onto North Main Street
405 ft
·
12 sec
·
North Main Street
3
Turn right onto Merchant Street
0.2 mi
·
42 sec
·
Merchant Street
4
Turn left onto 3rd Street
347 ft
·
18 sec
·
3rd Street
5
Turn right onto Market Street
1.0 mi
·
2 min
·
Market Street
6
Turn right onto US 61
7.3 mi
·
10 min
·
US 61
7
Continue on MO O
0.2 mi
·
24 sec
·
MO O
8
Take the ramp
0.2 mi
·
28 sec
Toward I 55 North: Bloomsdale
9
Merge onto I 55
40 mi
·
43 min
·
I 55
10
Continue on I 55
1.3 mi
·
1 min
·
Rosa Parks Highway
11
Take the exit
0.2 mi
·
27 sec
Exit 196
Toward I 270 West, I 255 East: Kansas City, Chicago
Use the slight right lane.
12
Keep slight left at fork
388 ft
·
8 sec
Toward I 270 West: Kansas City
Use the slight left lane.
13
Continue on this road
0.7 mi
·
1 min
·
this road
Exit 196
Toward I 270 West
14
Merge onto I 270
18 mi
·
22 min
·
I 270
Use the straight lane.
15
Take the exit
1.0 mi
·
1 min
Exit 20A
Toward I 70: Kansas City, Saint Louis, Saint Louis Lambert International Airport
Use the slight right lane.
16
Keep slight left at fork
0.1 mi
·
11 sec
Toward I 70 West: Kansas City
Use the slight left lane.
17
Continue on this road
0.6 mi
·
57 sec
·
this road
Exit 20B
Toward I 70 West: Kansas City
18
Merge onto I 70
14 mi
·
16 min
·
I 70
Use the straight / slight right lanes.
19
Take the exit
390 ft
·
8 sec
Exit 218
Toward MO K: O'Fallon, Main Street
Use the slight right lane.
20
Turn straight onto East Terra Lane
0.9 mi
·
1 min
·
East Terra Lane
Use the straight lane.
21
Turn right onto South Main Street
0.5 mi
·
1 min
·
South Main Street
22
Turn right
25 ft
·
1 sec
23
Arrive at destination
Trip Plan
Given the relatively short duration of 1 hour and 47 minutes, you have a lot of flexibility with your departure time. Aiming to leave Sainte Genevieve in the morning will allow you to arrive in O'Fallon with plenty of daylight. With a fuel cost estimated at $14, you won't need to worry about frequent refueling stops, though it's always wise to top off before starting a trip. The drive is well within a single day, so no overnight accommodations are necessary. Pay attention to traffic on I-270 as you approach the St. Louis metropolitan area.
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 43.2 miles from Sainte Genevieve, MO, or about 52m into the drive.
The longest continuous stretch on this route runs about 40 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 19 miles or 26m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 43.2 miles or 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 1h 30m
Traffic, exits, and arrival timing usually matter more near O'Fallon, MO than in the middle of the route.
Before You Leave
+
Open the route before leaving Sainte Genevieve, MO so your first major turns are already loaded.
Day 1
Settle into the route from Sainte Genevieve, MO
This is one driving day of about 86.4 miles and 1h 47m.
Your first comfortable stop window is around 19 miles from Sainte Genevieve, MO.
This route can stay practical as a one-day drive if traffic stays reasonable.
The longest stretch is on I 55 for about 40 miles.
Where to Stop
Rest stops, refuel points, and overnight suggestions along this route.
Mid-route town
Meal stop
43 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 19 miles helps settle the day before fatigue starts building.
Meal break
The midpoint is around 43.2 miles from Sainte Genevieve, 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 175 decision points cluster between mile 50.3 and 84.9 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
8
50.3 mi into trip
|
~1h in
Take the exit toward I 270 West, I 255 East: Kansas City, Chicago
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 196
Toward I 270 West, I 255 East: Kansas City, Chi...
8
50.6 mi into trip
|
~1h 1m in
Keep slight left at fork toward I 270 West: Kansas City
Highway fork - watch signs carefully. Lane positioning matters here
Use the slight left lane.
Toward I 270 West: Kansas City
8
69.5 mi into trip
|
~1h 25m in
Take the exit toward I 70: Kansas City, Saint Louis, Saint Louis Lambert International Airport
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 20A
Toward I 70: Kansas City, Saint Louis, Saint Lo...
7
70.6 mi into trip
|
~1h 26m in
Keep slight left at fork toward I 70 West: Kansas City
Highway fork - watch signs carefully. Lane positioning matters here
Use the slight left lane.
Toward I 70 West: Kansas City
8
84.9 mi into trip
|
~1h 44m 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
Fuel & Cost
Regular Gas
$13.51 one way
$27.02 round trip
$3.97/gal
25.4 MPG avg
30 kg CO2
| Fuel Type | $/gal | One Way | Round Trip |
|---|---|---|---|
| midgrade | $4.36 | $14.83 | $29.66 |
| premium | $4.89 | $16.63 | $33.25 |
| diesel | $5.61 | $19.08 | $38.15 |
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$14
Meals
$25–$50
Total
$39–$64
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 30.2 kg one way. Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $9 in charging · 0 stops · 67% less CO2
| Vehicle Type | kWh | Stops | DC Fast | Home Charge |
|---|---|---|---|---|
| Average EV | 25.9 | 0 | $9.07 | $4.15 |
| Efficient EV | 21.6 | 0 | $7.56 | $3.46 |
| EV Truck/SUV | 34.6 | 0 | $12.10 | $5.53 |
Gas CO2
30 kg
EV CO2
10 kg (67% 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
Late night in O'Fallon on Sunday
Local time
2:36 AM
CDT
Current temp
46°F
Rain Showers
NW 10 to 15 mph
97% chance
Live forecast
Flood Warning
Flood Warning issued April 18 at 2:07AM CDT until April 19 at 5:30PM CDT by NWS Springfield MO
Flood Warning
Flood Warning issued April 18 at 2:03AM CDT until April 18 at 10:45AM CDT by NWS Springfield MO
57°F
Arnold, MO
43 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
10 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
1h 47m on the road
The weather snapshot is not static. If you are leaving later, give both cities one more quick forecast check before departure.
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.
Ste. Geneviève National Historical Park
National Historical Park
Established by 1750, Ste. Geneviève was the first permanent European settlement in Missouri. Early French Canadian settlers were drawn here by the rich agricultural land known as Le Grand Champ (the B...
0 mi from route
Free
View on nps.gov
Gateway Arch National Park
National Park
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...
12 mi from route
~30 min detour
$19
near mile 50.7
View on nps.gov
Park data from the National Park Service API. Alerts update every 2 hours.
What kind of drive is this?
This route is primarily a highway-focused drive, with a 91% highway share. You'll spend most of your time on interstates, experiencing a consistent pace. The longest uninterrupted stretch is approximately 40 miles on I-55. Expect a modern interstate experience for the majority of the journey, designed for steady travel. The landscape will likely be typical of the Midwest's highway corridors.
91% highway — fuel and pacing are the main things to plan.
23 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 40 mi on I 55.
How Hard Is This Drive?
9/10
This is a straightforward highway drive that stays mostly on I 55 and I 270. This route has several spots where lane changes, forks, or exits need your full attention. The trickiest moment comes around 50.3 miles in.
Driving Effort
9/10
Demanding - stay alert through the decision-heavy sections
Balances navigation complexity with total wheel time.
This drive requires moderate attention. Across 86.4 miles you will encounter 17 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: at 50.3 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one; at 50.6 miles: Highway fork - watch signs carefully. Lane positioning matters here; at 69.5 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one.
Towns Mentioned on Route Signs
Based on OSRM destination-sign hints, not a full list of every settlement the road passes.
Towns Mentioned on Route Signs
Based on OSRM destination-sign hints, not a full list of every settlement the road passes.
Between Sainte Genevieve, MO and O'Fallon, MO, road signs point toward Chicago, Saint Louis and Saint Louis Lambert International Airport.
Chicago
50.3 mi in
|
~1h
Saint Louis
69.5 mi in
|
~1h 25m
Saint Louis Lambert International Airport
69.5 mi in
|
~1h 25m
Who Is This Route For?
Weekend Trip
Doable as a same-day drive at 1h 47m. Total distance: 86.4 miles.
Family Friendly
Moderate complexity with 0 natural rest stops along the way.
Solo Traveler
1h 47m drive, comfortable solo distance.
First-Time Driver
Mostly highway driving (91%). Some complex stretches to watch for.
Frequently Asked Questions
The longest stretch is about 40 miles on I 55. 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 O'Fallon, 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 50.3 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one; at 50.6 miles: Highway fork - watch signs carefully. Lane positioning matters here; at 69.5 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one.
Yes — Ste. Geneviève National Historical Park and 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 O'Fallon, 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, and NPS for national parks. See our methodology for refresh cadence and limitations.
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