How far is Colerain, OH from Saint Marys, OH?
The driving distance from Colerain, OH to Saint Marys, OH is about 223.9 miles (360.4 km), with a travel time of about 04h 25m by car.
- The straight-line flight distance is about 190.8 miles (307 km).
- For a round trip, plan for roughly 08h 51m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 6:00 AM to 8:00 AM EDT.
Reverse, save, or send this route
This drive is better planned with a longer stop or an overnight stay. Copy the route link, send it to another device, or print a clean version before you head out.
This drive is better planned with a longer stop or an overnight stay.
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 04h 25m.
An early departure helps you fit a real stop into the day without turning the return into a late-night drive.
This departure sits inside the recommended comfort window for the route.
Halfway Point
A useful midpoint for breaks, coffee, or meeting in the middle.
City in Ohio
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 Colerain and Saint Marys.
Turn-by-Turn Driving Directions
Step-by-step road directions between Colerain and Saint Marys.
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1
Start on Colerain Road
1.4 km · 1 min · Colerain Road
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2
Turn left onto Barton Colerain Road
2.3 mi · 6 min · Barton Colerain Road
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3
Turn left onto Barton Road
116 m · 12 sec · Barton Road
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4
At the end of the road, turn right onto Main Street
736 ft · 20 sec · Main Street
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5
Continue on Barton Road
3.5 mi · 8 min · Barton Road
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6
At the end of the road, turn right onto East Main Street
1.5 mi · 2 min · East Main Street
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7
Continue on National Road West
1.2 km · 1 min · National Road West
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8
Take the ramp slight right
1623 ft · 40 sec
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9
Merge slight left
105.6 mi · 1 hr 54 min
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10
Take the exit slight right toward I 270 South, I 270 North
1137 ft · 28 sec
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11
Keep slight right to continue on I 270 North
1.3 mi · 2 min
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12
Keep slight left to continue on I 270 North, US 40 West: Main Street, Whitehall
1797 ft · 24 sec
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13
Keep slight left
3160 ft · 42 sec
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14
Merge slight left onto Jack Nicklaus Freeway
22.8 mi · 26 min · Jack Nicklaus Freeway
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15
Take the exit slight right toward US 33 West, SR 161 West: Marysville, Avery-Muirfield Drive
2057 ft · 50 sec
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16
Keep slight left to continue on US 33 West, SR 161 West: Marysville
2240 ft · 42 sec
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17
Merge slight left
58.7 mi · 1 hr 9 min
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18
Turn left onto Market Street
22.1 mi · 27 min · Market Street
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19
Take the exit slight right toward SR 66: Saint Marys, Spencerville
555 ft · 14 sec
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20
Keep slight left
1.3 km · 2 min
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21
Turn straight
1.3 km · 2 min
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22
Turn right onto East Spring Street
1705 ft · 48 sec · East Spring Street
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23
Turn left onto South Front Street
32 m · 5 sec · South Front Street
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24
Arrive at your destination
0 m · 1 sec · South Front Street
Car Route Details
A richer read on the saved driving route between Colerain and Saint Marys.
Interchange-aware route
The drive includes several ramps, exits, or merges, so checking the next few maneuvers before busy interchanges is useful.
National Road West
Merge slight left
106 mi · 01h 54m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A longer out-and-back drive
This is still possible in one day, but it becomes a long driving day. Leaving early and planning your stop window matters more here.
Chance Rain Showers leaving Colerain 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 Colerain to Saint Marys?
The road trip is about 223.9 miles (360.4 km) and usually takes 04h 25m in normal driving conditions.
Is this a same-day trip or an overnight route?
This is still possible in one day, but it becomes a long driving day. Leaving early and planning your stop window matters more here.
What is the halfway point on this route?
Reynoldsburg is a useful midpoint, sitting about 111.8 miles from Colerain and 112.2 miles from Saint Marys.
How much longer is the road route than the straight-line distance?
The direct path is about 190.8 miles (307 km), while the road route adds roughly 33.1 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 6:00 AM to 8:00 AM EDT. If you want a more comfortable same-day return, try to leave by 8:08 AM EDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $29.27 one way or $58.54 round trip. Estimated CO2 is about 70.2 kg one way.
What should you check before leaving?
Before you leave, expect Chance Rain Showers around Colerain and Chance Rain Showers near Saint Marys.
Stop Ideas Near Reynoldsburg
Useful break, food, and waypoint ideas within about 15 miles of the route midpoint.
Transit and Meeting Points
Useful pickup, handoff, or rendezvous points close to Reynoldsburg.
Columbus, OH
Flight Path Map
This map shows the direct air route between Colerain and Saint Marys. Straight-line distance: 190.76 mi (307 km).
#1 Colerain
The most populous city in Hamilton County, Ohio.
| Population | 59,145 |
| Coordinates | 40.1259000, -80.8087000 |
| Altitude | 384 |
| 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: 360 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 07h 27m |
| 40 mph (64.37 km/h) | 05h 35m |
| 50 mph (80.47 km/h) | 04h 28m |
| 60 mph (96.56 km/h) | 03h 43m |
| 70 mph (112.65 km/h) | 03h 11m |
| 80 mph (129 km/h) | 02h 47m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.71 | $29.27 | $58.54 |
| Mid-grade | $4.24 | $33.51 | $67.02 |
| Premium | $4.79 | $37.84 | $75.68 |
| Diesel | $4.30 | $34.00 | $68.00 |
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.