Origin
O'Fallon, IL
Night in O'Fallon on Saturday
Local time
11:35 PM
CDT
Current temp
57°F
Unavailable
Live forecast
Trip from O'Fallon, IL to Cahokia, IL
Compiled and reviewed by the US Trip Planner planning team at COD Solutions Oy · Last reviewed Apr 19, 2026 · Editorial standards
Drive Time
26m
Distance
18.9 mi
30 km
Drive Score
6/10
Good drive
Same Day?
Yes, doable
Fuel Cost
$3
one way
EV Charging
Unknown
Best Time to Leave
4 AM
0h 24m
★
6 AM
0h 27m
8 AM
0h 31m
10 AM
0h 28m
12 PM
0h 28m
3 PM
0h 29m
5 PM
0h 31m
8 PM
0h 25m
Estimated drive times based on typical traffic patterns. Actual times may vary with weather, construction, and real-time conditions.
O'Fallon, IL
Wikimedia Commons
Cahokia, IL
Wikimedia Commons
Trip Overview
If you are looking for a quick and straightforward transit across the Illinois Midwest, this 18.9-mile connection between O'Fallon and Cahokia is a highly efficient choice. You can expect to complete the journey in about 26 minutes, making it an ideal candidate for a single-day trip. With a fuel budget of approximately $3, it is a very economical route for commuters or casual travelers. Because the drive is short, you do not need to worry about overnight logistics or complex planning. It serves as a practical link between these two Illinois communities, prioritizing speed and accessibility over a slow-paced scenic tour.
Main Roads
| Road | Distance | Duration |
|---|---|---|
| I 64 | 12.7 mi | 15m |
| IL 3 | 3.6 mi | 6m |
| West State Street | 1.2 mi | 2m |
| I 55 | 0.5 mi | <1m |
| West Highway 50 | 0.5 mi | <1m |
| West 1st Street | <0.1 mi | <1m |
Longest stretch:
I 64
— 12.7 mi, about 15m
Turn-by-Turn Driving Directions
Step-by-step road directions between O'Fallon, IL and Cahokia, IL.
1
Start on West State Street
1.0 mi
·
2 min
·
West State Street
2
Enter roundabout onto West State Street
72 ft
·
3 sec
·
West State Street
3
Continue on West State Street
0.2 mi
·
27 sec
·
West State Street
4
Turn right onto West Highway 50
0.5 mi
·
51 sec
·
West Highway 50
5
Take the ramp
0.4 mi
·
51 sec
6
Merge onto I 64; US 50
13 mi
·
15 min
·
I 64; US 50
Use the straight / slight right lanes.
7
Keep slight right at fork onto I 55; IL 3
0.5 mi
·
32 sec
·
I 55; IL 3
Exit 1
Toward IL 3 South: Cahokia
Use the slight right lane.
8
Take the exit onto IL 3
3.6 mi
·
6 min
·
IL 3
Exit 1
Toward IL 3 South: Cahokia Heights, Great River Road South
Use the slight right lane.
9
Turn right onto West 1st Street
94 ft
·
4 sec
·
West 1st Street
10
Arrive at destination
West 1st Street
Heads-up: tricky spots
5 of 75 decision points cluster between mile 1 and 15.2 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
4
1 mi into trip
|
~2m in
|
West State Street
Enter roundabout onto West State Street
Roundabout - know your exit number before entering
3
1 mi into trip
|
~2m in
|
West State Street
Right onto West State Street
Navigation decision point
5
2 mi into trip
|
~4m in
|
I 64; US 50
Merge onto I 64; US 50
Merge point - match speed before joining. Lane positioning matters here
Use the straight / slight right lanes.
8
14.7 mi into trip
|
~19m in
|
I 55; IL 3
Keep slight right at fork onto I 55; IL 3 toward IL 3 South: Cahokia
Highway fork - watch signs carefully. Lane positioning matters here
Use the slight right lane.
Exit 1
Toward IL 3 South: Cahokia
8
15.2 mi into trip
|
~20m in
|
IL 3
Take the exit onto IL 3 toward IL 3 South: Cahokia Heights, Great River Road South
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 1
Toward IL 3 South: Cahokia Heights, Great River...
Fuel & Cost
Regular Gas
$2.95 one way
$5.91 round trip
$3.97/gal
25.4 MPG avg
7 kg CO2
| Fuel Type | $/gal | One Way | Round Trip |
|---|---|---|---|
| midgrade | $4.36 | $3.24 | $6.49 |
| premium | $4.89 | $3.64 | $7.27 |
| diesel | $5.61 | $4.17 | $8.35 |
No toll roads detected on this route.
Drive Cost (one way)
Fuel
$3
Estimated CO2 emission: 6.6 kg one way. Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $2 in charging · 0 stops · 71% less CO2
| Vehicle Type | kWh | Stops | DC Fast | Home Charge |
|---|---|---|---|---|
| Average EV | 5.7 | 0 | $1.98 | $0.91 |
| Efficient EV | 4.7 | 0 | $1.65 | $0.76 |
| EV Truck/SUV | 7.6 | 0 | $2.65 | $1.21 |
Gas CO2
7 kg
EV CO2
2 kg (71% 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
Cahokia, IL
Night in Cahokia on Saturday
Local time
11:35 PM
CDT
Current temp
80°F
Unavailable
Live forecast
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
23 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
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.
What kind of drive is this?
This trip is heavily highway-focused, with 92% of your travel occurring on major thoroughfares. You will spend the bulk of your time on I-64, which accounts for the longest uninterrupted stretch of 12.7 miles. The transition from the interstate to IL-3 and West State Street marks the shift from high-speed highway driving into the local infrastructure of your destination. You should be prepared for a consistent, fast-paced experience that favors direct transit. Expect a functional, no-frills drive that gets you from point A to point B with minimal deviation.
92% highway — fuel and pacing are the main things to plan.
10 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 12.7 mi on I 64.
How Hard Is This Drive?
5/10
This is a straightforward highway drive that stays mostly on I 64 and IL 3. You will hit about 7 points where you need to pay attention to lane position or signs. The trickiest moment comes around 1 miles in near West State Street.
Driving Effort
5/10
Moderate - straightforward overall, but long enough or busy enough to require pacing
Balances navigation complexity with total wheel time.
This drive requires moderate attention. Across 18.9 miles you will encounter 7 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 1 miles (West State Street): Roundabout - know your exit number before entering; at 1 miles (West State Street): Navigation decision point; at 2 miles (I 64; US 50): Merge point - match speed before joining. Lane positioning matters here.
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.
On the drive from O'Fallon, IL to Cahokia, IL, road signs begin pointing toward Great River Road South along the way.
Great River Road South
15.2 mi in
|
~20m
|
via IL 3
About the Cities
Arriving in Cahokia, IL
Full guide →Founded 1699
Cahokia is a city in Saint Louis Metro East, Illinois.
Top landmarks
- • Church of the Holy Family — church building in Illinois, United States of America
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 26m. Total distance: 18.9 miles.
Family Friendly
Moderate complexity with 0 natural rest stops along the way.
Solo Traveler
26m drive, comfortable solo distance.
EV Driver
0 DC fast chargers along the route. Coverage: unknown.
First-Time Driver
Mostly highway driving (92%). Some complex stretches to watch for.
Frequently Asked Questions
The longest stretch is about 12.7 miles on I 64. The full list of main roads is in the Roads section above.
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 1 miles (West State Street): Roundabout - know your exit number before entering; at 1 miles (West State Street): Navigation decision point; at 2 miles (I 64; US 50): Merge point - match speed before joining. Lane positioning matters here.
Yes. A round trip is manageable in a single day if you plan a break at Cahokia, IL 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, and EIA for fuel prices. See our methodology for refresh cadence and limitations.
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