Origin
Dellwood, MO
Afternoon in Dellwood on Saturday
Local time
2:22 PM
CDT
Current temp
58°F
Unavailable
Live forecast
Trip from Dellwood, 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
34m
Distance
25.6 mi
41 km
Drive Score
7/10
Good drive
Same Day?
Yes, doable
Fuel Cost
$4
one way
EV Charging
Unknown
Best Time to Leave
4 AM
0h 32m
★
6 AM
0h 35m
8 AM
0h 40m
10 AM
0h 37m
12 PM
0h 36m
3 PM
0h 37m
5 PM
0h 40m
8 PM
0h 33m
Estimated drive times based on typical traffic patterns. Actual times may vary with weather, construction, and real-time conditions.
Dellwood, MO
Momo King
O'Fallon, MO
Wikimedia Commons
Trip Overview
The drive from Dellwood, MO to O'Fallon, MO covers 25.6 miles and takes about 34m behind the wheel. This route is realistic as a one-day drive if you keep your stops efficient.
The route leans on I 70, Airport Road, East Terra Lane for much of the mileage, and the overall profile is mostly highway. The longest uninterrupted segment is about 19.6 miles on I 70. At current regular gas prices, budget about $4.00 one way before food or hotel costs.
Main Roads
| Road | Distance | Duration |
|---|---|---|
| I 70 | 19.6 mi | 24m |
| Airport Road | 1.8 mi | 2m |
| East Terra Lane | 0.9 mi | 1m |
| Inner Belt Expressway | 0.8 mi | <1m |
| Chambers Road | 0.7 mi | 1m |
| South Main Street | 0.5 mi | 1m |
| Hereford Avenue | 0.4 mi | <1m |
Longest stretch:
I 70
— 19.6 mi, about 24m
Turn-by-Turn Driving Directions
Step-by-step road directions between Dellwood, MO and O'Fallon, MO.
1
Start on Chambers Road
0.7 mi
·
1 min
·
Chambers Road
2
Continue on Hereford Avenue
0.4 mi
·
39 sec
·
Hereford Avenue
3
Continue on Airport Road
1.8 mi
·
2 min
·
Airport Road
4
Take the ramp
0.3 mi
·
19 sec
Toward I 170 South
5
Merge onto I 170
0.8 mi
·
59 sec
·
Inner Belt Expressway
6
Take the exit
0.4 mi
·
48 sec
Exit 7B
Toward I 70 West: Kansas City
Use the slight right lane.
7
Merge onto I 70
20 mi
·
24 min
·
I 70
Use the straight lane.
8
Take the exit
390 ft
·
8 sec
Exit 218
Toward MO K: O'Fallon, Main Street
Use the slight right lane.
9
Turn straight onto East Terra Lane
0.9 mi
·
1 min
·
East Terra Lane
Use the straight lane.
10
Turn right onto South Main Street
0.5 mi
·
1 min
·
South Main Street
11
Turn right
25 ft
·
1 sec
12
Arrive at destination
Heads-up: tricky spots
5 of 85 decision points cluster between mile 3 and 25.1 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
4
3 mi into trip
|
~4m in
Take the ramp toward I 170 South
Navigation decision point
Toward I 170 South
7
4.1 mi into trip
|
~6m in
Take the exit toward I 70 West: Kansas City
Exit ramp - move to the correct lane early. Lane positioning matters here
Use the slight right lane.
Exit 7B
Toward I 70 West: Kansas City
5
4.5 mi into trip
|
~6m in
|
I 70
Merge onto I 70
Merge point - match speed before joining. Lane positioning matters here
Use the straight lane.
8
24.1 mi into trip
|
~31m 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
4
25.1 mi into trip
|
~33m in
|
South Main Street
Turn right onto South Main Street
Navigation decision point
Fuel & Cost
Regular Gas
$4.00 one way
$8.00 round trip
$3.97/gal
25.4 MPG avg
9 kg CO2
| Fuel Type | $/gal | One Way | Round Trip |
|---|---|---|---|
| midgrade | $4.36 | $4.39 | $8.79 |
| premium | $4.89 | $4.93 | $9.85 |
| diesel | $5.61 | $5.65 | $11.30 |
No toll roads detected on this route.
Drive Cost (one way)
Fuel
$4
Estimated CO2 emission: 9 kg one way. Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $3 in charging · 0 stops · 67% less CO2
| Vehicle Type | kWh | Stops | DC Fast | Home Charge |
|---|---|---|---|---|
| Average EV | 7.7 | 0 | $2.69 | $1.23 |
| Efficient EV | 6.4 | 0 | $2.24 | $1.02 |
| EV Truck/SUV | 10.2 | 0 | $3.58 | $1.64 |
Gas CO2
9 kg
EV CO2
3 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
Afternoon in O'Fallon on Saturday
Local time
2:22 PM
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
34m 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?
25.6 mi in 34m, mostly highway — 19.6 mi of that is on I 70.
80% highway — fuel and pacing are the main things to plan.
12 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 19.6 mi on I 70.
How Hard Is This Drive?
6/10
This is a straightforward highway drive that stays mostly on I 70 and Airport Road. You will hit about 8 points where you need to pay attention to lane position or signs. The trickiest moment comes around 3 miles in.
Driving Effort
6/10
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 25.6 miles you will encounter 8 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 3 miles: Navigation decision point; at 4.1 miles: Exit ramp - move to the correct lane early. Lane positioning matters here; at 4.5 miles (I 70): 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 Dellwood, MO to O'Fallon, MO, road signs begin pointing toward Mo K: O'fallon along the way.
Mo K: O'fallon
24.1 mi in
|
~31m
Who Is This Route For?
Weekend Trip
Doable as a same-day drive at 34m. Total distance: 25.6 miles.
Family Friendly
Moderate complexity with 0 natural rest stops along the way.
Solo Traveler
34m drive, comfortable solo distance.
EV Driver
0 DC fast chargers along the route. Coverage: unknown.
First-Time Driver
Mostly highway driving (80%). Some complex stretches to watch for.
Frequently Asked Questions
The longest stretch is about 19.6 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 3 miles: Navigation decision point; at 4.1 miles: Exit ramp - move to the correct lane early. Lane positioning matters here; at 4.5 miles (I 70): Merge point - match speed before joining. 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 Trip.ovh 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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