How far is Middletown, OH from Saint Marys, OH?
The driving distance from Middletown, OH to Saint Marys, OH is about 86.4 miles (139 km), with a travel time of about 01h 51m by car.
- The straight-line flight distance is about 71 miles (114.2 km).
- For a round trip, plan for roughly 03h 43m 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 51m.
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 Miami County, Ohio, United States
Route Weather Snapshot
Check the forecast at both ends before you head out.
Chance Rain Showers
Chance Rain Showers
Driving Route Map
The map below follows the saved road route between Middletown and Saint Marys.
Turn-by-Turn Driving Directions
Step-by-step road directions between Middletown and Saint Marys.
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1
Start on Clark Street
37 m · 7 sec · Clark Street
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2
Turn right onto Central Avenue
695 ft · 23 sec · Central Avenue
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3
Turn right onto North Clinton Street
1511 ft · 27 sec · North Clinton Street
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4
Continue on North Verity Parkway
4.3 mi · 7 min · North Verity Parkway
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5
Continue on Middletown Pike
1 mi · 2 min · Middletown Pike
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6
Turn straight onto Riley Boulevard
1.1 km · 1 min · Riley Boulevard
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7
Turn right onto East 6th Street
1.2 mi · 2 min · East 6th Street
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8
Turn left onto I 75 North: Dayton
1414 ft · 36 sec
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9
Merge slight left
17.1 mi · 20 min
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10
Keep slight left to continue on I 75 North: Toledo
39.3 mi · 44 min
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11
Take the exit slight right toward SR 29: Saint Marys, Sidney
1338 ft · 36 sec
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12
Turn left onto Saint Marys Avenue
11.8 mi · 16 min · Saint Marys Avenue
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13
Turn right
8.9 mi · 16 min
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14
At the end of the road, turn left onto East Spring Street
1.2 mi · 2 min · East Spring Street
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15
Turn left onto South Front Street
32 m · 5 sec · South Front Street
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16
Arrive at your destination
0 m · 1 sec · South Front Street
Car Route Details
A richer read on the saved driving route between Middletown and Saint Marys.
Highway-focused drive
Most of the mileage stays on named highways, so the important moments are ramps, exits, merges, and the final local approach.
I 75 North
Keep slight left to continue on I 75 North: Toledo
39.3 mi · 00h 44m
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.
Chance Rain Showers leaving Middletown and Chance Rain Showers near Saint Marys.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Middletown to Saint Marys?
The road trip is about 86.4 miles (139 km) and usually takes 01h 51m 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?
Troy is a useful midpoint, sitting about 43.2 miles from Middletown and 43.2 miles from Saint Marys.
How much longer is the road route than the straight-line distance?
The direct path is about 71 miles (114.2 km), while the road route adds roughly 15.4 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 2:46 PM EDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $11.30 one way or $22.60 round trip. Estimated CO2 is about 27.1 kg one way.
What should you check before leaving?
Before you leave, expect Chance Rain Showers around Middletown and Chance Rain Showers near Saint Marys.
Stop Ideas Near Troy
Useful break, food, and waypoint ideas within about 15 miles of the route midpoint.
Scene75 Entertainment Center | Dayton
Huber Heights City Hall
The Solid Rock Apostolic Church
Transit and Meeting Points
Useful pickup, handoff, or rendezvous points close to Troy.
Connersville station
Columbus, OH
Cincinnati, OH
Cincinnati Museum Center at Union Terminal
Flight Path Map
This map shows the direct air route between Middletown and Saint Marys. Straight-line distance: 70.97 mi (114.22 km).
#1 Middletown
The most populous city in Butler County, Ohio.
| Population | 46,140 |
| Coordinates | 39.5150600, -84.3982800 |
| Altitude | 200 |
| Country | United States |
#2 Saint Marys
City in Ohio, United States
| Population | 8,113 |
| Coordinates | 40.5422700, -84.3894000 |
| Altitude | 264 |
| Country | United States |
End: Saint Marys (-84.3894, 40.54227)
Estimated Travel Time
Distance: 139 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 02h 52m |
| 40 mph (64.37 km/h) | 02h 09m |
| 50 mph (80.47 km/h) | 01h 43m |
| 60 mph (96.56 km/h) | 01h 26m |
| 70 mph (112.65 km/h) | 01h 14m |
| 80 mph (129 km/h) | 01h 04m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.71 | $11.30 | $22.60 |
| Mid-grade | $4.24 | $12.94 | $25.88 |
| Premium | $4.79 | $14.61 | $29.22 |
| Diesel | $4.30 | $13.13 | $26.25 |
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 19, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.