How far is Dayton, OH from Union, OH?
The driving distance from Dayton, OH to Union, OH is about 11.7 miles (18.8 km), with a travel time of about 00h 19m by car.
- The straight-line flight distance is about 11.4 miles (18.3 km).
- For a round trip, plan for roughly 00h 38m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 7:00 AM to 7:00 PM EDT.
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 19m.
This is a short drive, so your comfort window is wide. Traffic and current weather matter more than the clock.
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.
Route Weather Snapshot
Check the forecast at both ends before you head out.
Driving Route Map
The map below follows the saved road route between Dayton and Union.
Turn-by-Turn Driving Directions
Step-by-step road directions between Dayton and Union.
-
1
Start on South Main Street
11.7 mi · 19 min · South Main Street
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2
Arrive at your destination
0 m · 1 sec · North Main Street
Car Route Details
A richer read on the saved driving route between Dayton and Union.
Straightforward drive
The saved road route has a manageable number of maneuvers and should be easy to follow with normal attention to signs.
South Main Street
Start on South Main Street
11.7 mi · 00h 19m
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.
Sunny leaving Dayton and Sunny near Union.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Dayton to Union?
The road trip is about 11.7 miles (18.8 km) and usually takes 00h 19m 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?
Shiloh is a useful midpoint, sitting about 5.8 miles from Dayton and 5.8 miles from Union.
How much longer is the road route than the straight-line distance?
The direct path is about 11.4 miles (18.3 km), while the road route adds roughly 0.3 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 EDT. If you want a more comfortable same-day return, try to leave by 7:52 PM EDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $1.52 one way or $3.04 round trip. Estimated CO2 is about 3.6 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around Dayton and Sunny near Union.
Stop Ideas Near Shiloh
Useful break, food, and waypoint ideas within about 15 miles of the route midpoint.
Scene75 Entertainment Center | Dayton
City of Riverside Administration Offices
Town Hall Theatre
Transit and Meeting Points
Useful pickup, handoff, or rendezvous points close to Shiloh.
Connersville station
Cincinnati, OH
Cincinnati Museum Center at Union Terminal
Columbus, OH
Flight Path Map
This map shows the direct air route between Dayton and Union. Straight-line distance: 11.36 mi (18.29 km).
#1 Dayton
The ninth most populous city in Ohio.
| Population | 139,907 |
| Coordinates | 39.7589500, -84.1916100 |
| Altitude | 225 |
| Country | United States |
#2 Union
City in Montgomery and Miami Counties in the U.
| Population | 6,909 |
| Coordinates | 39.8978300, -84.3063300 |
| Altitude | 281 |
| Country | United States |
End: Union (-84.30633, 39.89783)
Estimated Travel Time
Distance: 19 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 00h 23m |
| 40 mph (64.37 km/h) | 00h 17m |
| 50 mph (80.47 km/h) | 00h 14m |
| 60 mph (96.56 km/h) | 00h 11m |
| 70 mph (112.65 km/h) | 00h 10m |
| 80 mph (129 km/h) | 00h 08m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.71 | $1.52 | $3.04 |
| Mid-grade | $4.24 | $1.74 | $3.48 |
| Premium | $4.79 | $1.96 | $3.93 |
| Diesel | $4.30 | $1.76 | $3.53 |
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 · Apr 23, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.