How far is O'Fallon, MO from Sunset Hills, MO?
The driving distance from O'Fallon, MO to Sunset Hills, MO is about 32.5 miles (52.3 km), with a travel time of about 00h 45m by car.
- The straight-line flight distance is about 24.5 miles (39.5 km).
- For a round trip, plan for roughly 01h 31m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 8:00 AM to 10:00 AM CDT.
Reverse, save, or send this route
This route works well as a day trip with time at the destination. Copy the route link, send it to another device, or print a clean version before you head out.
This route works well as a day trip with time at the destination.
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 45m.
A morning start gives you useful time at the destination and keeps the return out of the late evening.
You are leaving earlier than the recommended window, which gives you extra margin for breaks and traffic.
Halfway Point
A useful midpoint for breaks, coffee, or meeting in the middle.
City in Missouri, United States
Route Weather Snapshot
Check the forecast at both ends before you head out.
Isolated Showers And Thunderstorms then Chance Showers And Thunderstorms
Scattered Showers And Thunderstorms
Driving Route Map
The map below follows the saved road route between O'Fallon and Sunset Hills.
Turn-by-Turn Driving Directions
Step-by-step road directions between O'Fallon and Sunset Hills.
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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
13.5 mi · 17 min
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6
Take the exit slight right toward I 270: Chicago, Memphis
872 ft · 12 sec
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7
Keep slight right to continue on I 270 South: Memphis
2339 ft · 33 sec
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8
Continue on I 270 South: Memphis
723 ft · 10 sec
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9
Merge slight left
13.8 mi · 17 min
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10
Take the exit slight right toward I 44 East, US 50 East, MO 366 East: Saint Louis
1552 ft · 1 min
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11
Continue on I 44 East, US 50 East, MO 366 East: Saint Louis
851 ft · 12 sec
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12
Keep slight right to continue on MO 366 East: Watson Road
2937 ft · 1 min
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13
Turn right onto Rott Road
46 m · 4 sec
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14
Turn straight onto South Geyer Road
139 m · 15 sec · South Geyer Road
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15
Turn right onto Rott Road
1.3 km · 2 min · Rott Road
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16
Continue on Robyn Road
1.3 km · 2 min · Robyn Road
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17
Turn left onto Robyn Hills Drive
631 ft · 28 sec · Robyn Hills Drive
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18
Arrive at your destination
0 m · 1 sec · Robyn Hills Drive
Car Route Details
A richer read on the saved driving route between O'Fallon and Sunset Hills.
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 270 South
Merge slight left
13.8 mi · 00h 17m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A comfortable day-trip route
This route works well as a day trip. You can leave in the morning, spend meaningful time at the destination, and still return the same day.
Isolated Showers And Thunderstorms then Chance Showers And Thunderstorms leaving O'Fallon and Scattered Showers And Thunderstorms near Sunset Hills.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from O'Fallon to Sunset Hills?
The road trip is about 32.5 miles (52.3 km) and usually takes 00h 45m in normal driving conditions.
Is this a same-day trip or an overnight route?
This route works well as a day trip. You can leave in the morning, spend meaningful time at the destination, and still return the same day.
What is the halfway point on this route?
Maryland Heights is a useful midpoint, sitting about 16.3 miles from O'Fallon and 16.3 miles from Sunset Hills.
How much longer is the road route than the straight-line distance?
The direct path is about 24.5 miles (39.5 km), while the road route adds roughly 8 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 8:00 AM to 10:00 AM CDT. If you want a more comfortable same-day return, try to leave by 4:58 PM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $4.34 one way or $8.67 round trip. Estimated CO2 is about 10.2 kg one way.
What should you check before leaving?
Before you leave, expect Isolated Showers And Thunderstorms then Chance Showers And Thunderstorms around O'Fallon and Scattered Showers And Thunderstorms near Sunset Hills.
Stop Ideas Near Maryland Heights
Useful break, food, and waypoint ideas within about 15 miles of the route midpoint.
Transit and Meeting Points
Useful pickup, handoff, or rendezvous points close to Maryland Heights.
Kirkwood
Gateway Transportation Center
Alton
Washington
Flight Path Map
This map shows the direct air route between O'Fallon and Sunset Hills. Straight-line distance: 24.52 mi (39.46 km).
#1 O'Fallon
The most populous city in St.
| Population | 89,769 |
| Coordinates | 38.8106100, -90.6998500 |
| Altitude | 165 |
| Country | United States |
#2 Sunset Hills
City in Saint Louis County, Missouri, United States
| Population | 8,448 |
| Coordinates | 38.5389400, -90.4073400 |
| Altitude | 188 |
| Country | United States |
End: Sunset Hills (-90.40734, 38.53894)
Estimated Travel Time
Distance: 52 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 01h 04m |
| 40 mph (64.37 km/h) | 00h 48m |
| 50 mph (80.47 km/h) | 00h 39m |
| 60 mph (96.56 km/h) | 00h 32m |
| 70 mph (112.65 km/h) | 00h 27m |
| 80 mph (129 km/h) | 00h 24m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $4.34 | $8.67 |
| Mid-grade | $4.25 | $4.89 | $9.78 |
| Premium | $4.65 | $5.35 | $10.70 |
| Diesel | $5.30 | $6.10 | $12.20 |
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 · May 31, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.