How far is St. Marys, GA from Dunwoody, GA?
The driving distance from St. Marys, GA to Dunwoody, GA is about 357.9 miles (576 km), with a travel time of about 06h 38m by car.
- The straight-line flight distance is about 275.4 miles (443.2 km).
- For a round trip, plan for roughly 13h 17m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 6:00 AM to 7:30 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 06h 38m.
Starting early still helps, but most travelers will want a longer stop or an overnight stay on a route this long.
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.
Human settlement in Emanuel County, Georgia, United States of America
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 St. Marys and Dunwoody.
Turn-by-Turn Driving Directions
Step-by-step road directions between St. Marys and Dunwoody.
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1
Start on West Hall Street
24 m · 9 sec · West Hall Street
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2
Turn left onto Osborne Street
3 mi · 5 min · Osborne Street
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3
Continue on Kingsland Saint Marys Road
3 mi · 5 min · Kingsland Saint Marys Road
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4
Continue on East King Avenue
2.2 mi · 3 min · East King Avenue
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5
Take the ramp slight right toward I 95 North: I 95 North
2798 ft · 1 min
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6
Merge slight left
94.3 mi · 1 hr 42 min
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7
Keep slight right
3075 ft · 48 sec
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8
Take the exit slight right toward I 16 West: Macon
1192 ft · 51 sec
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9
Merge slight left onto Jim Gillis Historic Savannah Parkway
155.9 mi · 2 hr 47 min · Jim Gillis Historic Savannah Parkway
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10
Continue on Fall Line Freeway
2560 ft · 40 sec · Fall Line Freeway
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11
Keep slight right to continue on I 75 North: Atlanta
2746 ft · 43 sec
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12
Merge slight left
62.1 mi · 1 hr 7 min
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13
Keep slight right to continue on Terrell Starr Parkway
10.1 mi · 12 min · Terrell Starr Parkway
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14
Keep slight right to continue on I 285 East: Augusta, Greenville
1 km · 1 min
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15
Merge slight left onto Atlanta Bypass / The Perimeter
21 mi · 24 min · Atlanta Bypass / The Perimeter
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16
Take the exit slight right toward North Peachtree Road, North Shallowford Road, Chamblee-Dunwoody Road
1509 ft · 39 sec
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17
Continue on Cotillion Drive
2585 ft · 1 min · Cotillion Drive
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18
Turn right onto North Shallowford Road
1.3 km · 2 min · North Shallowford Road
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19
Continue on Chamblee Dunwoody Way
123 m · 11 sec · Chamblee Dunwoody Way
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20
Continue on Chamblee Dunwoody Road
1.5 mi · 3 min · Chamblee Dunwoody Road
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21
Turn left
28 m · 3 sec
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22
Turn right
24 m · 6 sec
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23
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between St. Marys and Dunwoody.
Long-distance drive
This route is long enough that fuel, rest stops, weather, and timing matter more than any single maneuver.
Jim Gillis Historic Savannah Parkway
Merge slight left onto Jim Gillis Historic Savannah Parkway
156 mi · 02h 47m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
Better with a longer stop
This route is long enough that most travelers will be better off planning an overnight stay or a more deliberate stop window.
Sunny leaving St. Marys and Sunny near Dunwoody.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from St. Marys to Dunwoody?
The road trip is about 357.9 miles (576 km) and usually takes 06h 38m in normal driving conditions.
Is this a same-day trip or an overnight route?
This route is long enough that most travelers will be better off planning an overnight stay or a more deliberate stop window.
What is the halfway point on this route?
Nunez is a useful midpoint, sitting about 179 miles from St. Marys and 178.9 miles from Dunwoody.
How much longer is the road route than the straight-line distance?
The direct path is about 275.4 miles (443.2 km), while the road route adds roughly 82.5 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 6:00 AM to 7:30 AM EDT. Starting early still helps, but most travelers will want a longer stop or an overnight stay on a route this long.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $50.03 one way or $100.05 round trip. Estimated CO2 is about 112.2 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around St. Marys and Sunny near Dunwoody.
Stop Ideas Near Nunez
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 Nunez.
Jesup
Flight Path Map
This map shows the direct air route between St. Marys and Dunwoody. Straight-line distance: 275.39 mi (443.2 km).
#1 St. Marys
City in Camden County, Georgia, USA
| Population | 17,968 |
| Coordinates | 30.7305100, -81.5464900 |
| Altitude | 3 |
| Country | United States |
#2 Dunwoody
Town in DeKalb County, Georgia, USA
| Population | 49,326 |
| Coordinates | 33.9462100, -84.3346500 |
| Altitude | 345 |
| Country | United States |
End: Dunwoody (-84.33465, 33.94621)
Estimated Travel Time
Distance: 576 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 11h 55m |
| 40 mph (64.37 km/h) | 08h 56m |
| 50 mph (80.47 km/h) | 07h 09m |
| 60 mph (96.56 km/h) | 05h 57m |
| 70 mph (112.65 km/h) | 05h 06m |
| 80 mph (129 km/h) | 04h 27m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.96 | $50.03 | $100.05 |
| Mid-grade | $4.43 | $55.94 | $111.88 |
| Premium | $4.78 | $60.35 | $120.69 |
| Diesel | $5.62 | $71.03 | $142.06 |
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 Georgia · Apr 15, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.