Atlanta to St. Marys is 342.2 miles and takes about 6h 17m via I-75, I-16, and I-95, with a fuel budget near $57 and enough daylight to finish in a day. This trip stays within the Southeast region, entirely within Georgia, taking you from the bustling city of Atlanta to the coastal area around St. Marys. With 96% of the route on highways, expect a fairly direct drive. It's a good option if you're looking for a manageable one-day trip without extensive off-highway navigation.
Trip Pace
Same-day drive is realistic
A same-day return is possible, but it will make for a full day on the road.
Break Rhythm
1 planned break
Plan on a short reset every 3 to 4 hours to stay fresh behind the wheel.
Midpoint
171.1 miles from Atlanta, GA
A natural place for your longest stop of the day
, about 3h 8m into the drive
.
Main Roads
Road
Distance
Duration
I 16
155.9 mi
2h 47m
I 95
94.5 mi
1h 41m
I 75
77.1 mi
1h 25m
Kingsland Saint Marys Road
3 mi
4m
Osborne Road
3 mi
4m
East King Avenue
2.5 mi
4m
James Wendell George Parkway
2.3 mi
3m
Downtown Connector
0.6 mi
<1m
Longest stretch:
I 16
— 155.9 mi, about 2h 47m
Traffic on I-75
Hour-of-day weekday pattern from 125 FHWA count stations on your route.
Peak
4 PM
~5,725 veh/hr typical
· worst 6,618
Quietest
2 AM
~939 veh/hr
Peak-to-quiet ratio
6.1×
busier at peak than in the quiet hours
12a6anoon6p11p
Averaged across 52 weeks of 2023 FHWA Travel Monitoring Analysis System data. Weekday hours only (Mon–Fri).
Turn-by-Turn Driving Directions
Step-by-step road directions between Atlanta, GA and St. Marys, GA.
1
Start on Capitol Avenue Southeast
195 ft·9 sec·Capitol Avenue Southeast
2
Turn left onto Martin Luther King Jr Drive Southwest
434 ft·16 sec·Martin Luther King Jr Drive Southwest
Use the left lane.
3
Turn left onto Washington Street Southwest
0.4 mi·51 sec·Washington Street Southwest
Use the left / straight lanes.
4
Continue on Pulliam Street Southwest
0.6 mi·1 min·Pulliam Street Southwest
5
Take the ramp
0.2 mi·23 sec
Toward I 75 South, I 85 South
6
Merge onto I 75; I 85
0.6 mi·50 sec·Downtown Connector
7
Continue on I 75; I 85
2.3 mi·3 min·James Wendell George Parkway
Use the straight / slight right lanes.
8
Keep slight left at fork onto I 75
65 mi·1 hr 11 min·I 75
Use the straight / slight right lanes.
9
Keep slight left at fork onto I 75
12 mi·13 min·I 75
Toward Macon, SavannahUse the straight / slight right lanes.
10
Take the exit
1.1 mi·1 min
Exit 165Toward I 16 East: Jim Gillis Highway, SavannahUse the slight right lane.
11
Continue on I 16
156 mi·2 hr 47 min·I 16
Use the straight / slight right lanes.
12
Take the exit
0.5 mi·31 sec
Toward I 95 South: Brunswick, Jacksonville
13
Merge onto I 95
95 mi·1 hr 41 min·I 95
14
Take the exit
0.3 mi·42 sec
Exit 3Toward GA 40: Kingsland, St Marys
15
Turn left onto GA 40
2.5 mi·4 min·East King Avenue
Use the left lane.
16
Continue on GA 40
3.0 mi·4 min·Kingsland Saint Marys Road
17
Continue on GA 40
3.0 mi·4 min·Osborne Road
18
Turn right onto 41703
77 ft·3 sec·West Hall Street
19
Arrive at destination
41703
Trip Plan
Given the 6h 17m estimated drive time, starting your trip in the morning is advisable to ensure you arrive with plenty of daylight. The route is primarily highway, so keeping an eye on your fuel gauge is important, especially during the 155.9-mile stretch on I-16 where services might be more spaced out. Consider breaking up the drive with a quick stop around the halfway point or when you transition from I-16 to I-95. Since it's a single-day trip, you have the flexibility to adjust your schedule, but plan for potential traffic leaving Atlanta.
Morning Departure
Start early — leave by 6-7 AM to arrive at a reasonable hour.
Evening Departure
This is a long drive — plan for a morning departure or consider splitting it into two days.
You can normally do this drive in one day.
Plan roughly 1 meaningful break for fuel, food, and rest.
The halfway point lands around 171.1 miles from Atlanta, GA, or about 3h 8m into the drive.
The longest continuous stretch on this route runs about 155.9 miles.
This is a comfortable same-day trip.
Departure
Before you leave
Start with fuel, water, and navigation already sorted so the first hour feels easy.
First stop
Around 75 miles or 1h 24m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 171.1 miles or 3h 8m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Final approach
Final hour starts around 5h 8m
Traffic, exits, and arrival timing usually matter more near St. Marys, GA than in the middle of the route.
Before You Leave
+
Open the route before leaving Atlanta, GA so your first major turns are already loaded.
+
Leave with enough water and a charging cable within reach, not packed away.
+
Check your fuel range against the first long segment, especially if you are starting outside city service areas.
Day 1
Settle into the route from Atlanta, GA
This is one driving day of about 342.2 miles and 6h 17m.
Your first comfortable stop window is around 75 miles from Atlanta, GA.
This route can stay practical as a one-day drive if traffic stays reasonable.
Plan about 1 real break rather than only quick fuel stops.
The longest stretch is on I 16 for about 155.9 miles.
Where to Stop
Rest stops, refuel points, and overnight suggestions along this route.
Place data sourced from public business listings. Hours and availability may vary.
Heads-up: tricky spots
5 of 12
5 decision points cluster between mile 0 and 333.3 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
6
0 mi into trip|~0m in|Martin Luther King Jr Drive Southwest
Turn left onto Martin Luther King Jr Drive Southwest
Lane positioning matters here
Use the left lane.
6
4.3 mi into trip|~6m in|I 75
Keep slight left at fork onto I 75
Highway fork - watch signs carefully. Lane positioning matters here
Use the straight / slight right lanes.
8
69.1 mi into trip|~1h 18m in|I 75
Keep slight left at fork onto I 75 toward Macon, Savannah
Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one
Use the straight / slight right lanes.
Toward Macon, Savannah
8
81.3 mi into trip|~1h 31m in
Take the exit toward I 16 East: Jim Gillis Highway, Savannah
Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one
Use the slight right lane.
Exit 165
Toward I 16 East: Jim Gillis Highway, Savannah
6
333.3 mi into trip|~6h 3m in
Take the exit toward GA 40: Kingsland, St Marys
Exit ramp - move to the correct lane early. Multiple destination signs - pick the right one
Exit 3
Toward GA 40: Kingsland, St Marys
Fuel & Cost
Regular Gas
$50.52 one way
$101.04 round trip
$3.75/gal25.4 MPG avg120 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.12
$55.52
$111.04
premium
$4.49
$60.52
$121.04
diesel
$4.80
$64.61
$129.23
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$51
Meals
$25–$50
Total
$76–$101
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 119.7 kg one way.
Prices: EIA weekly data, 2026-07-13.
Driving Electric?
About $36 in charging
· 1 stop
· 67% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
102.7
1
$35.93
$16.43
Efficient EV
85.6
0
$29.94
$13.69
EV Truck/SUV
136.9
1
$47.91
$21.90
Gas CO2
120 kg
EV CO2
40 kg (67% less)
Plan for 1 charging stop. A 30-minute DC fast charge mid-route should be enough to complete the trip comfortably.
DC fast charging avg $0.35/kWh. Home charging avg $0.16/kWh. US grid CO2: 0.39 kg/kWh.
Travel Intel
Current conditions at both ends of the drive.
Forecast as of Jul 17, 2026
Origin
Atlanta, GA
Afternoon
in Atlanta on Saturday
Local time
4:30 PM
EDT
Current temp
91°F
Mostly Sunny then Chance Showers And Thunderstorms
NW 5 to 10 mph48% chanceLive forecast
Heat Advisory
Heat Advisory issued July 17 at 7:49AM EDT until July 17 at 8:00PM EDT by NWS Peachtree City GA
Destination
St. Marys, GA
Afternoon
in St. Marys on Saturday
Local time
4:30 PM
EDT
Current temp
92°F
Mostly Sunny then Slight Chance Showers And Thunderstorms
NE 3 to 10 mph23% chanceLive forecast
Heat Advisory
Heat Advisory issued July 17 at 7:49AM EDT until July 17 at 8:00PM EDT by NWS Peachtree City GA
Seasonal Notes
Summer travel usually means heavier construction, hotter rest stops, and busier weekend traffic around major cities.
Winter travel shortens daylight, so a route that looks manageable on paper can feel much longer after dark.
Holiday weekends tend to make both departure and arrival windows slower than the raw route time suggests.
Time zone
Same local time
Origin and destination are on the same clock, so arrival timing is easier to judge at a glance.
Temperature spread
1 degrees warmer at arrival
A meaningful temperature swing is a good cue to rethink layers, water, and how soon you want to arrive.
Road read
6h 17m on the road
Start early — leave by 6-7 AM to arrive at a reasonable hour.
Weather data from the National Weather Service. Conditions may change; check closer to your travel date.
National Parks Near This Route
Worth a detour if your schedule allows.
Martin Luther King, Jr. National Historical Park
National Historical Park
Welcome to Martin Luther King, Jr. National Historical Park & Preservation District where a young boy grows up in a time of segregation. He was moved by destiny to lead the modern civil rights movemen...
Welcome to Ocmulgee Mounds National Historical Park. This park is a prehistoric American Indian site, where many different American Indian cultures occupied this land for thousands of years. American...
War was imminent as James Oglethorpe established Fort Frederica in 1736, to help protect the British colonies from the Spanish in Florida. Fort Frederica illustrates the story of the War of Jenkins Ea...
St Marys is the gateway to Cumberland Island, Georgia's largest and southernmost barrier island. Here pristine maritime forests, undeveloped beaches and wide marshes whisper the stories of both man an...
10 mi from route
~26 min detour
$15
near mile 342.2
Today the river valley attracts us for so many reasons. Take a solitary walk to enjoy nature’s display, raft leisurely through the rocky shoals with friends, fish the misty waters as the sun comes up,...
For much of the 19th century, masonry fortifications were the United States’ main defense against overseas enemies. However, during the Civil War, new technology proved its superiority over these fort...
Park data from the National Park Service API. Alerts update every 2 hours.
More Details
What kind of drive is this?
You'll be on highways for about 96% of this 342.2-mile drive. The longest continuous stretch on a single highway is 155.9 miles, primarily on I-16. Expect a mostly highway profile for the entirety of your trip, with a high concentration of exits and interchanges as you navigate between interstates. The transition from primarily highway driving to surface roads will be minimal and likely occur only in the immediate vicinity of your destination.
96% highway — fuel and pacing are the main things to plan.
19 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 155.9 mi on I 16.
How Hard Is This Drive?
8/10
This is a straightforward highway drive that stays mostly on I 16 and I 95. This route has several spots where lane changes, forks, or exits need your full attention. The trickiest moment comes early in the drive near Martin Luther King Jr Drive Southwest.
Driving Effort8/10
Demanding - plan breaks and stay ahead of the key maneuvers
Balances navigation complexity with total wheel time.
This is a demanding drive. With 12 significant decision points across 342.2 miles, you will need to stay alert - especially through interchange areas and urban stretches. Consider splitting it into segments if you are not comfortable with fast highway navigation.
Where does it get tricky?
The main spots that need attention: near the start (Martin Luther King Jr Drive Southwest): Lane positioning matters here; at 4.3 miles (I 75): Highway fork - watch signs carefully. Lane positioning matters here; at 69.1 miles (I 75): Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one.
Elevation Profile
Gently rolling terrain
1,040 ft10 ft
Total Climb
10 ft
Total Descent
1,041 ft
Highest Point
1,040 ft
Elevation Range
1,031 ft
Towns Mentioned on Route Signs
Based on OSRM destination-sign hints, not a full list of every settlement the road passes.
Between Atlanta, GA and St. Marys, GA, road signs point toward Macon, Savannah and Jacksonville.
Atlanta is the vanguard of the New South, with the charm and elegance of the Old. It's a city that balances southern traditions with sleek modernism, and southern hospitality with three skylines and the world’s busiest airport. It's a city that has been burnt to the ground and built back up; seen the horrors of war; felt the pain of droughts and floods; and given birth to Martin Luther King, Jr., the greatest figure of the civil rights movement. Atlanta is the capital of the state of Georgia.
=== Welcome World Cup fans ===
Atlanta is one of the 16 North American cities hosting matches for the 2026 FIFA World Cup. Games in the region will be played at the spectacular Mercedes‑Benz Stadium, located in the heart of Downtown Atlanta.
Top landmarks
•Georgia State Capitol — state capitol building of the U.S. state of Georgia
•Virginia-Highland — human settlement in Atlanta, Georgia, United States of America
•Martin Luther King Jr. National Historical Park — heritage site in Atlanta, Georgia, USA
Doable as a same-day drive at 6h 17m. Total distance: 342.2 miles.
Family Friendly
Moderate complexity with 1 natural rest stops along the way.
Solo Traveler
6h 17m drive, plan rest stops for pacing.
Frequently Asked Questions
The longest stretch is about 155.9 miles on I 16. The full list of main roads is in the Roads section above.
Yes — we found about 41 rest areas or service plazas within a short detour of the route (from OpenStreetMap). See the Rest Stops tab under Nearby Places for locations and mile markers. Plan to stretch, use the bathroom, and top off fluids every 2–3 hours on longer drives.
It helps. This route has a higher-than-average number of complex decision points, which get harder in the dark. If the last hour of the trip is on surface roads or mountain grades, aim to arrive at St. Marys, GA before sunset when you can. Check the Trip Plan for departure windows that land you in daylight.
Only with planning. This is a long drive for kids — consider splitting it into two days rather than pushing through. Plan at least 1 meaningful breaks. There are 41 rest areas along the route for bathroom stops.
The main spots that need attention: near the start (Martin Luther King Jr Drive Southwest): Lane positioning matters here; at 4.3 miles (I 75): Highway fork - watch signs carefully. Lane positioning matters here; at 69.1 miles (I 75): Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one.
Yes — Martin Luther King, Jr. National Historical Park, Ocmulgee Mounds National Historical Park and Fort Frederica National Monument (6 total within detour distance). See the National Parks section for detour distances and tips on detours.
Not recommended in a single day. At 6.3 hours each way, a round trip means 12.6 hours of driving — that is an unsafe level of fatigue for most drivers. Plan at least one night at St. Marys, GA before the return drive.
