How far is Hamilton, OH from Saint Marys, OH?
The driving distance from Hamilton, OH to Saint Marys, OH is about 94.8 miles (152.6 km), with a travel time of about 02h 05m by car.
- The straight-line flight distance is about 79.5 miles (127.9 km).
- For a round trip, plan for roughly 04h 11m 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 02h 05m.
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.
Route Weather Snapshot
Check the forecast at both ends before you head out.
Chance Rain Showers
Driving Route Map
The map below follows the saved road route between Hamilton and Saint Marys.
Turn-by-Turn Driving Directions
Step-by-step road directions between Hamilton and Saint Marys.
-
1
Start on High Street
763 ft · 36 sec · High Street
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2
Turn left onto North Martin Luther King Junior Boulevard
2614 ft · 1 min · North Martin Luther King Junior Boulevard
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3
Continue on North 3rd Street
1.7 mi · 2 min · North 3rd Street
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4
Continue on South Riverside Drive
1.2 mi · 2 min · South Riverside Drive
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5
Continue on Hamilton Eaton Road
6.7 mi · 9 min · Hamilton Eaton Road
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6
Enter the roundabout and take exit 2 toward the route
48 m · 2 sec
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7
Exit the roundabout
74.2 mi · 1 hr 38 min
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8
Turn right onto East Market Street
8.1 mi · 10 min · East Market Street
-
9
Take the exit slight right toward US 33 West, SR 29 East: Fort Wayne Industries, Saint Marys
2660 ft · 1 min
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10
Keep slight right
1.4 mi · 3 min
-
11
Turn right onto North Main Street
1405 ft · 37 sec · North Main Street
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12
Turn left onto West Spring Street
75 m · 9 sec · West Spring Street
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13
Turn right onto South Front Street
32 m · 5 sec · South Front Street
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14
Arrive at your destination
0 m · 1 sec · South Front Street
Car Route Details
A richer read on the saved driving route between Hamilton and Saint Marys.
Straightforward drive
The saved road route has a manageable number of maneuvers and should be easy to follow with normal attention to signs.
Hamilton Eaton Road
Exit the roundabout
74.2 mi · 01h 38m
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.
Sunny leaving Hamilton 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 Hamilton to Saint Marys?
The road trip is about 94.8 miles (152.6 km) and usually takes 02h 05m 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?
Arcanum is a useful midpoint, sitting about 47.5 miles from Hamilton and 47.4 miles from Saint Marys.
How much longer is the road route than the straight-line distance?
The direct path is about 79.5 miles (127.9 km), while the road route adds roughly 15.3 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 8:00 AM to 10:00 AM EDT. If you want a more comfortable same-day return, try to leave by 2:18 PM EDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $12.41 one way or $24.82 round trip. Estimated CO2 is about 29.8 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around Hamilton and Chance Rain Showers near Saint Marys.
Stop Ideas Near Arcanum
Useful break, food, and waypoint ideas within about 15 miles of the route midpoint.
Darke County Visitors Bureau
Advance America
Greenville City Hall
Arcanum Community of Faith Church
Transit and Meeting Points
Useful pickup, handoff, or rendezvous points close to Arcanum.
Connersville station
Cincinnati, OH
Cincinnati Museum Center at Union Terminal
Flight Path Map
This map shows the direct air route between Hamilton and Saint Marys. Straight-line distance: 79.48 mi (127.91 km).
#1 Hamilton
The most populous city in Butler County, Ohio.
| Population | 62,148 |
| Coordinates | 39.3995000, -84.5613400 |
| Altitude | 181 |
| 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: 153 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 03h 09m |
| 40 mph (64.37 km/h) | 02h 22m |
| 50 mph (80.47 km/h) | 01h 53m |
| 60 mph (96.56 km/h) | 01h 34m |
| 70 mph (112.65 km/h) | 01h 21m |
| 80 mph (129 km/h) | 01h 10m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.71 | $12.41 | $24.82 |
| Mid-grade | $4.24 | $14.21 | $28.42 |
| Premium | $4.79 | $16.05 | $32.09 |
| Diesel | $4.30 | $14.42 | $28.84 |
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.