How far is Saint Marys, OH from Hamilton, OH?
The driving distance from Saint Marys, OH to Hamilton, OH is about 103 miles (165.8 km), with a travel time of about 01h 45m by car.
- The straight-line flight distance is about 79.5 miles (127.9 km).
- For a round trip, plan for roughly 03h 30m 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 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.
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 Saint Marys and Hamilton.
Turn-by-Turn Driving Directions
Step-by-step road directions between Saint Marys and Hamilton.
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1
Start on South Front Street
32 m · 12 sec · South Front Street
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2
Turn left onto West Spring Street
75 m · 9 sec · West Spring Street
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3
Turn right onto North Main Street
1405 ft · 31 sec · North Main Street
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4
Continue on Indiana Avenue
1.6 mi · 3 min · Indiana Avenue
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5
Turn left
8.4 mi · 11 min
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6
Turn left onto South Main Street
55.1 mi · 1 hr 8 min · South Main Street
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7
Continue on North Barron Street
19.1 mi · 29 min · North Barron Street
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8
Enter the roundabout and take exit 2 toward Hamilton Eaton Road
27 m · 1 sec · Hamilton Eaton Road
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9
Exit the roundabout onto Hamilton Eaton Road
6.7 mi · 9 min · Hamilton Eaton Road
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10
Continue on North Riverside Drive
1.2 mi · 1 min · North Riverside Drive
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11
Continue on North 3rd Street
1.7 mi · 2 min · North 3rd Street
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12
Turn slight left onto North Martin Luther King Junior Boulevard
2614 ft · 1 min · North Martin Luther King Junior Boulevard
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13
Turn right onto High Street
953 ft · 41 sec · High Street
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14
Continue on High Street
69 m · 15 sec · High Street
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15
Arrive at your destination
0 m · 1 sec · High Street
Car Route Details
A richer read on the saved driving route between Saint Marys and Hamilton.
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
Turn left onto South Main Street
55.1 mi · 01h 08m
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 Saint Marys and Sunny near Hamilton.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Saint Marys to Hamilton?
The road trip is about 103 miles (165.8 km) and usually takes 01h 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?
Arcanum is a useful midpoint, sitting about 47.5 miles from Saint Marys and 55.5 miles from Hamilton.
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 23.5 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 3:00 PM EDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $13.49 one way or $26.97 round trip. Estimated CO2 is about 32.3 kg one way.
What should you check before leaving?
Before you leave, expect Chance Rain Showers around Saint Marys and Sunny near Hamilton.
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 Saint Marys and Hamilton. Straight-line distance: 79.48 mi (127.91 km).
#1 Saint Marys
City in Ohio, United States
| Population | 8,113 |
| Coordinates | 40.5422700, -84.3894000 |
| Altitude | 264 |
| Country | United States |
#2 Hamilton
The most populous city in Butler County, Ohio.
| Population | 62,148 |
| Coordinates | 39.3995000, -84.5613400 |
| Altitude | 181 |
| Country | United States |
End: High Street (-84.56131, 39.399555)
Estimated Travel Time
Distance: 166 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 03h 26m |
| 40 mph (64.37 km/h) | 02h 34m |
| 50 mph (80.47 km/h) | 02h 03m |
| 60 mph (96.56 km/h) | 01h 43m |
| 70 mph (112.65 km/h) | 01h 28m |
| 80 mph (129 km/h) | 01h 17m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.71 | $13.49 | $26.97 |
| Mid-grade | $4.24 | $15.44 | $30.88 |
| Premium | $4.79 | $17.44 | $34.87 |
| Diesel | $4.30 | $15.67 | $31.33 |
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.