How far is O'Fallon, MO from Dellwood, MO?
The driving distance from O'Fallon, MO to Dellwood, MO is about 25.9 miles (41.7 km), with a travel time of about 00h 35m by car.
- The straight-line flight distance is about 22.7 miles (36.5 km).
- For a round trip, plan for roughly 01h 10m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 7:00 AM to 7:00 PM CDT.
Reverse, save, or send this route
This is an easy same-day return drive. Copy the route link, send it to another device, or print a clean version before you head out.
This is an easy same-day return drive.
Flight Distance
Driving Distance
Gas Cost Calculator
Leave and Arrive Planner
Pick a departure time to see your estimated arrival and same-day return window.
Drive time stays fixed at 00h 35m.
This is a short drive, so your comfort window is wide. Traffic and current weather matter more than the clock.
This departure sits inside the recommended comfort window for the route.
Halfway Point
A useful midpoint for breaks, coffee, or meeting in the middle.
A city in St.
Route Weather Snapshot
Check the forecast at both ends before you head out.
Showers And Thunderstorms
Showers And Thunderstorms
Driving Route Map
The map below follows the saved road route between O'Fallon and Dellwood.
Turn-by-Turn Driving Directions
Step-by-step road directions between O'Fallon and Dellwood.
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1
Start on the route
8 m · 7 sec
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2
Turn left onto South Main Street
3116 ft · 2 min · South Main Street
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3
Turn left onto Drennen Parkway
1.4 km · 1 min · Drennen Parkway
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4
Take the ramp slight left toward I 70 East: Saint Louis
133 m · 6 sec
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5
Merge slight left
19.8 mi · 25 min
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6
Take the exit slight left toward I 170 North
2853 ft · 1 min
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7
Merge slight right onto Inner Belt Expressway
1.4 km · 1 min · Inner Belt Expressway
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8
Take the exit slight right toward Airport Road
950 ft · 20 sec
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9
Turn right onto Airport Road
1.8 mi · 3 min · Airport Road
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10
Continue on Hereford Avenue
2206 ft · 39 sec · Hereford Avenue
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11
Continue on Chambers Road
1.2 km · 1 min · Chambers Road
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12
Arrive at your destination
0 m · 1 sec · Chambers Road
Car Route Details
A richer read on the saved driving route between O'Fallon and Dellwood.
Turn-heavy local drive
The route has frequent decision points for its length, so lane choice and turn timing will matter more than cruising speed.
I 70 East
Merge slight left
19.8 mi · 00h 25m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A short regional drive
This route is short enough to handle as a quick errand, commute, or easy same-day return without much planning overhead.
Showers And Thunderstorms leaving O'Fallon and Showers And Thunderstorms near Dellwood.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from O'Fallon to Dellwood?
The road trip is about 25.9 miles (41.7 km) and usually takes 00h 35m in normal driving conditions.
Is this a same-day trip or an overnight route?
This route is short enough to handle as a quick errand, commute, or easy same-day return without much planning overhead.
What is the halfway point on this route?
Saint Charles is a useful midpoint, sitting about 12.9 miles from O'Fallon and 13 miles from Dellwood.
How much longer is the road route than the straight-line distance?
The direct path is about 22.7 miles (36.5 km), while the road route adds roughly 3.2 extra miles because roads do not follow the straight air line.
When is the best time to leave for this route?
A good departure window is usually 7:00 AM to 7:00 PM CDT. If you want a more comfortable same-day return, try to leave by 7:20 PM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $3.43 one way or $6.86 round trip. Estimated CO2 is about 8.1 kg one way.
What should you check before leaving?
Before you leave, expect Showers And Thunderstorms around O'Fallon and Showers And Thunderstorms near Dellwood.
Stop Ideas Near Saint Charles
Useful break, food, and waypoint ideas within about 15 miles of the route midpoint.
City Hall Park
Jennings City Hall
Ferguson Finance Director
Transit and Meeting Points
Useful pickup, handoff, or rendezvous points close to Saint Charles.
Kirkwood
Gateway Transportation Center
Alton
Washington
Flight Path Map
This map shows the direct air route between O'Fallon and Dellwood. Straight-line distance: 22.7 mi (36.54 km).
#1 O'Fallon
The most populous city in St.
| Population | 89,769 |
| Coordinates | 38.8106100, -90.6998500 |
| Altitude | 165 |
| Country | United States |
#2 Dellwood
City in Washington County, Minnesota, United States of America
| Population | 4,994 |
| Coordinates | 38.7495000, -90.2856700 |
| Altitude | 164 |
| Country | United States |
End: Dellwood (-90.28567, 38.7495)
Estimated Travel Time
Distance: 42 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 00h 51m |
| 40 mph (64.37 km/h) | 00h 38m |
| 50 mph (80.47 km/h) | 00h 31m |
| 60 mph (96.56 km/h) | 00h 25m |
| 70 mph (112.65 km/h) | 00h 22m |
| 80 mph (129 km/h) | 00h 19m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $3.43 | $6.86 |
| Mid-grade | $4.25 | $3.87 | $7.74 |
| Premium | $4.65 | $4.24 | $8.47 |
| Diesel | $5.30 | $4.83 | $9.65 |
Assumes 8.3 L/100 km (about 28.3 MPG). CO2 is an estimate and varies by vehicle, fuel blend, traffic, and terrain.
Prices in Missouri · Apr 18, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.