Origin
Clayton, MO
Late night in Clayton on Sunday
Local time
1:01 AM
CDT
Current temp
58°F
Unavailable
Live forecast
Trip from Clayton, 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
40m
Distance
29.6 mi
48 km
Drive Score
6/10
Good drive
Same Day?
Yes, doable
Fuel Cost
$5
one way
EV Charging
Good
6 stations
Best Time to Leave
4 AM
0h 37m
★
6 AM
0h 40m
8 AM
0h 47m
10 AM
0h 43m
12 PM
0h 42m
3 PM
0h 43m
5 PM
0h 47m
8 PM
0h 38m
Estimated drive times based on typical traffic patterns. Actual times may vary with weather, construction, and real-time conditions.
Clayton, MO
Wikimedia Commons
O'Fallon, MO
Wikimedia Commons
Trip Overview
If you are looking to travel between Clayton and O'Fallon, Missouri, you are in for a quick 29.6-mile trip that typically takes about 40 minutes. This route is a straightforward, highway-focused drive that fits perfectly into a single day, requiring no overnight stays. You can expect to spend approximately $5 on fuel for this transit, making it a budget-friendly option for your schedule. Because both cities are located within the Midwest, the transition is seamless and familiar. It is an ideal commute or day trip for those wanting a direct connection between these two Missouri points without the need for multiple stops.
Main Roads
| Road | Distance | Duration |
|---|---|---|
| I 70 | 19.8 mi | 24m |
| Inner Belt Expressway | 6.1 mi | 7m |
| East Terra Lane | 0.9 mi | 1m |
| Wydown Boulevard | 0.6 mi | 1m |
| South Main Street | 0.5 mi | 1m |
| Forest Park Parkway | 0.3 mi | <1m |
| Shaw Park Drive | 0.3 mi | <1m |
| South Hanley Road | 0.3 mi | <1m |
Longest stretch:
I 70
— 19.8 mi, about 24m
Turn-by-Turn Driving Directions
Step-by-step road directions between Clayton, MO and O'Fallon, MO.
1
Start on Hillvale Drive
178 ft
·
7 sec
·
Hillvale Drive
2
Turn left onto Wydown Boulevard
0.6 mi
·
1 min
·
Wydown Boulevard
3
At end of road, turn right onto South Hanley Road
0.3 mi
·
30 sec
·
South Hanley Road
4
Turn left onto Shaw Park Drive
0.3 mi
·
33 sec
·
Shaw Park Drive
Use the straight / left / right lanes.
5
Take the ramp
294 ft
·
6 sec
Toward Forest Park Parkway West
6
Merge onto Forest Park Parkway
0.3 mi
·
39 sec
·
Forest Park Parkway
Use the straight / slight right lanes.
7
Keep slight right at fork
0.2 mi
·
36 sec
Toward I 170 North
Use the slight right lane.
8
Merge onto I 170
6.1 mi
·
7 min
·
Inner Belt Expressway
Use the straight / slight right lanes.
9
Take the exit
0.4 mi
·
36 sec
Exit 7B
Toward I 70 West: Kansas City
Use the straight / slight left lanes.
10
Merge onto I 70
20 mi
·
24 min
·
I 70
Use the straight lane.
11
Take the exit
390 ft
·
8 sec
Exit 218
Toward MO K: O'Fallon, Main Street
Use the slight right lane.
12
Turn straight onto East Terra Lane
0.9 mi
·
1 min
·
East Terra Lane
Use the straight lane.
13
Turn right onto South Main Street
0.5 mi
·
1 min
·
South Main Street
14
Turn right
25 ft
·
1 sec
15
Arrive at destination
Heads-up: tricky spots
5 of 125 decision points cluster between mile 0.9 and 28.1 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
6
0.9 mi into trip
|
~2m in
|
Shaw Park Drive
Turn left onto Shaw Park Drive
Lane positioning matters here
Use the straight / left / right lanes.
5
1.3 mi into trip
|
~2m in
|
Forest Park Parkway
Merge onto Forest Park Parkway
Merge point - match speed before joining. Lane positioning matters here
Use the straight / slight right lanes.
7
1.6 mi into trip
|
~3m in
Keep slight right at fork toward I 170 North
Highway fork - watch signs carefully. Lane positioning matters here
Use the slight right lane.
Toward I 170 North
7
7.9 mi into trip
|
~11m in
Take the exit toward I 70 West: Kansas City
Exit ramp - move to the correct lane early. Lane positioning matters here
Use the straight / slight left lanes.
Exit 7B
Toward I 70 West: Kansas City
8
28.1 mi into trip
|
~37m 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
$4.63 one way
$9.26 round trip
$3.97/gal
25.4 MPG avg
10 kg CO2
| Fuel Type | $/gal | One Way | Round Trip |
|---|---|---|---|
| midgrade | $4.36 | $5.08 | $10.16 |
| premium | $4.89 | $5.70 | $11.39 |
| diesel | $5.61 | $6.54 | $13.07 |
No toll roads detected on this route.
Drive Cost (one way)
Fuel
$5
Estimated CO2 emission: 10.4 kg one way. Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $3 in charging · 0 stops · 70% less CO2
| Vehicle Type | kWh | Stops | DC Fast | Home Charge |
|---|---|---|---|---|
| Average EV | 8.9 | 0 | $3.11 | $1.42 |
| Efficient EV | 7.4 | 0 | $2.59 | $1.18 |
| EV Truck/SUV | 11.8 | 0 | $4.14 | $1.89 |
Gas CO2
10 kg
EV CO2
3 kg (70% 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
1:01 AM
CDT
Current temp
57°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
1 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
40m 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?
Expect a high-speed experience, as 89% of this 29.6-mile route consists of highway driving. You will spend the bulk of your time on I-70, which accounts for the longest uninterrupted stretch of 19.8 miles. The journey primarily utilizes I-70, the Inner Belt Expressway, and East Terra Lane to bridge the gap between Clayton and O'Fallon. This is not a winding, scenic backroad experience; instead, it is a purposeful, efficient drive designed for steady movement. You will find that the road maintains a consistent, fast-paced character throughout the entire duration of the trip.
89% highway — fuel and pacing are the main things to plan.
15 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 19.8 mi on I 70.
How Hard Is This Drive?
8/10
This is a straightforward highway drive that stays mostly on I 70 and Inner Belt Expressway. This route has several spots where lane changes, forks, or exits need your full attention. The trickiest moment comes around 0.9 miles in near Shaw Park Drive.
Driving Effort
8/10
Focused - busy navigation packed into a short drive
Balances navigation complexity with total wheel time.
This is a short but busy drive. With 12 decision points packed into just 29.6 miles, you will need to pay attention to lane changes and exits — but the whole thing is over in 40m.
Where does it get tricky?
The main spots that need attention: at 0.9 miles (Shaw Park Drive): Lane positioning matters here; at 1.3 miles (Forest Park Parkway): Merge point - match speed before joining. Lane positioning matters here; at 1.6 miles: Highway fork - watch signs carefully. Lane positioning matters here.
Elevation Profile
Mostly flat terrain
613 ft
444 ft
Total Climb
464 ft
Total Descent
482 ft
Highest Point
613 ft
~6.2 mi in
Elevation Range
169 ft
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 Clayton, MO to O'Fallon, MO, road signs begin pointing toward Mo K: O'fallon along the way.
Mo K: O'fallon
28.1 mi in
|
~37m
Who Is This Route For?
Weekend Trip
Doable as a same-day drive at 40m. Total distance: 29.6 miles.
Family Friendly
Moderate complexity with 0 natural rest stops along the way.
Solo Traveler
40m drive, comfortable solo distance.
EV Driver
0 DC fast chargers along the route. Coverage: unknown.
First-Time Driver
Mostly highway driving (89%). Some complex stretches to watch for.
Frequently Asked Questions
The longest stretch is about 19.8 miles on I 70. 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 0.9 miles (Shaw Park Drive): Lane positioning matters here; at 1.3 miles (Forest Park Parkway): Merge point - match speed before joining. Lane positioning matters here; at 1.6 miles: Highway fork - watch signs carefully. Lane positioning matters here.
Yes — 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, USGS 3DEP for elevation, and NPS for national parks. See our methodology for refresh cadence and limitations.
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