This 364.8-mile drive from St. Marys to Johns Creek, Georgia, is an achievable one-day trip, taking approximately 6 hours and 49 minutes. It's a highway-focused experience, with 90% of the journey on major roads, making it efficient for covering ground. The estimated fuel cost for this trip is $57, which is quite reasonable for the distance. Given its duration and highway profile, this route is best suited for a single day of travel. You'll be staying within the Southeast region for the entirety of your journey, primarily on established interstate routes. This trip offers a straightforward way to get from point A to point B without extensive detours.
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
182.4 miles from St. Marys, GA
A natural place for your longest stop of the day
, about 3h 21m into the drive
.
Main Roads
Road
Distance
Duration
Jim Gillis Historic Savannah Parkway
155.9 mi
2h 47m
I 95
94.9 mi
1h 42m
I 75
62.1 mi
1h 7m
Atlanta Bypass / The Perimeter
20.2 mi
23m
Terrell Starr Parkway
10.1 mi
11m
GA 141
6.2 mi
10m
Peachtree Industrial Boulevard
3.6 mi
4m
Osborne Street
3 mi
4m
Longest stretch:
Jim Gillis Historic Savannah Parkway
— 155.9 mi, about 2h 47m
Turn-by-Turn Driving Directions
Step-by-step road directions between St. Marys, GA and Johns Creek, GA.
1
Start on 41703
77 ft·8 sec·West Hall Street
2
Turn left onto GA 40
3.0 mi·4 min·Osborne Street
3
Continue on GA 40
3.0 mi·4 min·Kingsland Saint Marys Road
4
Continue on GA 40
2.2 mi·3 min·East King Avenue
5
Take the ramp
0.5 mi·1 min
Toward I 95 North: I 95 North
6
Merge onto I 95
94 mi·1 hr 42 min·I 95
7
Keep slight right at fork onto I 95
0.6 mi·47 sec·I 95
8
Take the exit
0.2 mi·50 sec
Exit 99BToward I 16 West: MaconUse the slight right lane.
Toward I 75 North: AtlantaUse the straight / left lanes.
12
Merge onto I 75
62 mi·1 hr 7 min·I 75
Use the straight / slight right lanes.
13
Keep slight right at fork onto I 675
10 mi·11 min·Terrell Starr Parkway
Exit 227Toward I 675 North: Augusta, GreenvilleUse the straight / slight right lanes.
14
Keep slight right at fork
0.6 mi·1 min
Toward I 285 East: Augusta, GreenvilleUse the slight left / slight right lanes.
15
Merge onto I 285
20 mi·23 min·Atlanta Bypass / The Perimeter
Use the straight / slight right lanes.
16
Take the exit
0.2 mi·33 sec
Exit 31Toward GA 141: Peachtree BoulevardUse the straight / slight right lanes.
17
Keep slight right at fork
0.3 mi·36 sec
Toward GA 141 North: Peachtree BoulevardUse the slight right lane.
18
Merge onto GA 141
3.6 mi·4 min·Peachtree Industrial Boulevard
Use the straight lane.
19
Keep slight left at fork onto GA 141
6.2 mi·10 min·GA 141
Toward GA 141 North: Cumming, DahlonegaUse the slight left / straight lanes.
20
Turn left onto Grove Point Road
0.2 mi·56 sec·Grove Point Road
21
Turn left onto Groomsbridge Road
0.5 mi·2 min·Groomsbridge Road
22
Turn right onto Morgan Hill Court
270 ft·11 sec·Morgan Hill Court
23
Arrive at destination
Morgan Hill Court
Trip Plan
For this 6-hour and 49-minute journey, starting early is key to maximizing your daylight and arriving at your destination comfortably. With only one recommended stop, you have flexibility in pacing yourself, but consider a break around the halfway point or after the 155.9-mile stretch on Jim Gillis Historic Savannah Parkway. Keep an eye on your fuel levels, especially as you transition between major highways; ensure you're topped up before embarking on longer segments. The $57 fuel cost is a good estimate, but always factor in a little extra for unexpected needs. This route is designed for a single day, so focus on a smooth, efficient drive rather than extensive sightseeing.
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 182.4 miles from St. Marys, GA, or about 3h 21m 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 80 miles or 1h 31m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 182.4 miles or 3h 21m 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 34m
Traffic, exits, and arrival timing usually matter more near Johns Creek, GA than in the middle of the route.
Before You Leave
+
Open the route before leaving St. Marys, 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 St. Marys, GA
This is one driving day of about 364.8 miles and 6h 49m.
Your first comfortable stop window is around 80 miles from St. Marys, 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 Jim Gillis Historic Savannah Parkway 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 17
5 decision points cluster between mile 103.7 and 357.9 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
7
103.7 mi into trip|~1h 56m in
Take the exit toward I 16 West: Macon
Exit ramp - move to the correct lane early. Lane positioning matters here
Use the slight right lane.
Exit 99B
Toward I 16 West: Macon
9
322.9 mi into trip|~5h 53m in|I 675 / Terrell Starr Parkway
Keep slight right at fork onto I 675 / Terrell Starr Parkway toward I 675 North: Augusta, Greenville
Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one
Use the straight / slight right lanes.
Exit 227
Toward I 675 North: Augusta, Greenville
8
333 mi into trip|~6h 5m in
Keep slight right at fork toward I 285 East: Augusta, Greenville
Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one
Use the slight left / slight right lanes.
Toward I 285 East: Augusta, Greenville
8
354 mi into trip|~6h 30m in
Keep slight right at fork toward GA 141 North: Peachtree Boulevard
Highway fork - watch signs carefully. Lane positioning matters here
Use the slight right lane.
Toward GA 141 North: Peachtree Boulevard
8
357.9 mi into trip|~6h 36m in|GA 141
Keep slight left at fork onto GA 141 toward GA 141 North: Cumming, Dahlonega
Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one
Use the slight left / straight lanes.
Toward GA 141 North: Cumming, Dahlonega
Fuel & Cost
Regular Gas
$57.05 one way
$114.09 round trip
$3.97/gal25.4 MPG avg128 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.34
$62.38
$124.75
premium
$4.70
$67.52
$135.03
diesel
$5.61
$80.54
$161.09
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$57
Meals
$25–$50
Total
$82–$107
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 127.6 kg one way.
Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $38 in charging
· 1 stop
· 66% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
109.4
1
$38.30
$17.51
Efficient EV
91.2
1
$31.92
$14.59
EV Truck/SUV
145.9
1
$51.07
$23.35
Gas CO2
128 kg
EV CO2
43 kg (66% 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 Apr 15, 2026
Origin
St. Marys, GA
Night
in St. Marys on Saturday
Local time
9:21 PM
EDT
Current temp
60°F
Unavailable
Live forecast
Destination
Johns Creek, GA
Night
in Johns Creek on Saturday
Local time
9:21 PM
EDT
Current temp
52°F
Unavailable
Live forecast
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
8 degrees cooler at arrival
A meaningful temperature swing is a good cue to rethink layers, water, and how soon you want to arrive.
Road read
6h 49m 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.
More Details
What kind of drive is this?
Expect a predominantly highway-focused drive on this route, with 90% of your travel on major roads. The longest uninterrupted stretch you'll encounter is 155.9 miles along the Jim Gillis Historic Savannah Parkway, offering a significant period of consistent travel. You'll spend a good portion of your time on I-95 and I-75, which are known for their efficiency in covering long distances. While this means a focus on speed and directness, it also suggests a less varied driving experience compared to routes with more local roads. The character of the drive is largely about making good time on well-maintained highways.
90% highway — fuel and pacing are the main things to plan.
23 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 155.9 mi on Jim Gillis Historic Savannah Parkway.
How Hard Is This Drive?
9/10
This is a straightforward highway drive that stays mostly on Jim Gillis Historic Savannah Parkway and I 95. This route has several spots where lane changes, forks, or exits need your full attention. The trickiest moment comes around 103.7 miles in.
Driving Effort9/10
High effort - long or complex enough to need steady focus all day
Balances navigation complexity with total wheel time.
This is a demanding drive. With 17 significant decision points across 364.8 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: at 103.7 miles: Exit ramp - move to the correct lane early. Lane positioning matters here; at 322.9 miles (I 675 / Terrell Starr Parkway): Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one; at 333 miles: Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one.
Towns Mentioned on Route Signs
Based on OSRM destination-sign hints, not a full list of every settlement the road passes.
Between St. Marys, GA and Johns Creek, GA, road signs point toward Savannah and Greenville.
Savannah
103.9 mi in|~1h 57m|via I 16
Greenville
322.9 mi in|~5h 53m|via I 675
Who Is This Route For?
Weekend Trip
Doable as a same-day drive at 6h 49m. Total distance: 364.8 miles.
Family Friendly
Moderate complexity with 1 natural rest stops along the way.
Solo Traveler
6h 49m drive, plan rest stops for pacing.
Frequently Asked Questions
The longest stretch is about 155.9 miles on Jim Gillis Historic Savannah Parkway. The full list of main roads is in the Roads section above.
Yes — we found about 44 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 Johns Creek, 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 44 rest areas along the route for bathroom stops.
The main spots that need attention: at 103.7 miles: Exit ramp - move to the correct lane early. Lane positioning matters here; at 322.9 miles (I 675 / Terrell Starr Parkway): Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one; at 333 miles: Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one.
Not recommended in a single day. At 6.8 hours each way, a round trip means 13.6 hours of driving — that is an unsafe level of fatigue for most drivers. Plan at least one night at Johns Creek, GA before the return drive.
