How far is Radnor, OH from Dayton, OH?
The driving distance from Radnor, OH to Dayton, OH is about 84.6 miles (136.1 km), with a travel time of about 01h 33m by car.
- The straight-line flight distance is about 70 miles (112.6 km).
- For a round trip, plan for roughly 03h 06m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 8:00 AM to 10:00 AM EDT.
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 01h 33m.
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.
Human settlement in Champaign County, Ohio, United States of America
Route Weather Snapshot
Check the forecast at both ends before you head out.
Areas Of Frost then Mostly Sunny
Driving Route Map
The map below follows the saved road route between Radnor and Dayton.
Turn-by-Turn Driving Directions
Step-by-step road directions between Radnor and Dayton.
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1
Start on Radnor Road
2 m · 7 sec · Radnor Road
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2
Turn left onto State Route 203
4.7 mi · 7 min · State Route 203
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3
Turn sharp right onto State Route 37 West
11 m · 6 sec · State Route 37 West
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4
Turn left onto South Section Line Road
1.4 mi · 3 min · South Section Line Road
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5
Turn right onto Marysville Road
12.3 mi · 14 min · Marysville Road
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6
Take the exit slight right
3.3 mi · 4 min
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7
Take the exit slight right toward US 36 West, SR 4 South: Urbana, Springfield
564 ft · 14 sec
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8
Keep slight left to continue on US 36 West, SR 4 South: Urbana, Springfield
28.5 mi · 34 min
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9
Turn right onto State Route 334
3.7 mi · 4 min · State Route 334
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10
Turn left
2639 ft · 1 min
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11
Merge slight left onto US Route 68
4.3 mi · 5 min · US Route 68
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12
Take the exit slight right toward US 40 West, SR 4 West: Dayton
1024 ft · 30 sec
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13
Turn left onto Upper Valley Pike
154 m · 11 sec · Upper Valley Pike
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14
Turn right onto West Main Street
810 ft · 11 sec · West Main Street
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15
Continue on West National Road
928 ft · 12 sec · West National Road
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16
Keep slight left
11 mi · 12 min
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17
Take the exit slight right toward SR 4, SR 235: Dayton, New Carlisle
1730 ft · 42 sec
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18
Keep slight left to continue on SR 4, SR 235 South: Dayton
11.1 mi · 14 min
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19
Take the exit slight right toward SR 48: Main Street, Grand Avenue
1108 ft · 29 sec
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20
Turn left onto North Main Street
1.4 km · 2 min · North Main Street
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21
Arrive at your destination
0 m · 1 sec · South Main Street
Car Route Details
A richer read on the saved driving route between Radnor and Dayton.
Highway-focused drive
Most of the mileage stays on named highways, so the important moments are ramps, exits, merges, and the final local approach.
US 36 West
Keep slight left to continue on US 36 West, SR 4 South: Urbana, Springfield
28.5 mi · 00h 34m
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.
Areas Of Frost leaving Radnor and Areas Of Frost then Mostly Sunny near Dayton.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Radnor to Dayton?
The road trip is about 84.6 miles (136.1 km) and usually takes 01h 33m 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?
Mutual is a useful midpoint, sitting about 41.4 miles from Radnor and 43.1 miles from Dayton.
How much longer is the road route than the straight-line distance?
The direct path is about 70 miles (112.6 km), while the road route adds roughly 14.6 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 EDT. If you want a more comfortable same-day return, try to leave by 3:24 PM EDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $11.08 one way or $22.16 round trip. Estimated CO2 is about 26.6 kg one way.
What should you check before leaving?
Before you leave, expect Areas Of Frost around Radnor and Areas Of Frost then Mostly Sunny near Dayton.
Stop Ideas Near Mutual
Useful break, food, and waypoint ideas within about 15 miles of the route midpoint.
London City Hall
Springfield City Hall
Town Hall Emporium
Historic City Hall Bell
Transit and Meeting Points
Useful pickup, handoff, or rendezvous points close to Mutual.
Columbus, OH
Flight Path Map
This map shows the direct air route between Radnor and Dayton. Straight-line distance: 69.97 mi (112.6 km).
#1 Radnor
Township in Delaware County, Ohio
| Population | 1,904 |
| Coordinates | 40.3842300, -83.1507500 |
| Altitude | 285 |
| Country | United States |
#2 Dayton
The ninth most populous city in Ohio.
| Population | 139,907 |
| Coordinates | 39.7589500, -84.1916100 |
| Altitude | 225 |
| Country | United States |
End: South Main Street (-84.191655, 39.758942)
Estimated Travel Time
Distance: 136 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 02h 49m |
| 40 mph (64.37 km/h) | 02h 06m |
| 50 mph (80.47 km/h) | 01h 41m |
| 60 mph (96.56 km/h) | 01h 24m |
| 70 mph (112.65 km/h) | 01h 12m |
| 80 mph (129 km/h) | 01h 03m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.71 | $11.08 | $22.16 |
| Mid-grade | $4.24 | $12.68 | $25.37 |
| Premium | $4.79 | $14.32 | $28.64 |
| Diesel | $4.30 | $12.87 | $25.74 |
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 Ohio · May 03, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.