How far is Alpharetta, GA from Decatur, GA?
The driving distance from Alpharetta, GA to Decatur, GA is about 26.2 miles (42.1 km), with a travel time of about 00h 38m by car.
- The straight-line flight distance is about 20.8 miles (33.4 km).
- For a round trip, plan for roughly 01h 16m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 7:00 AM to 7:00 PM EDT.
Reverse, save, or send this route
This is an easy same-day return drive. Copy the route link, send it to another device, or print a clean version before you head out.
This is an easy same-day return drive.
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 00h 38m.
This is a short drive, so your comfort window is wide. Traffic and current weather matter more than the clock.
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.
A city in Fulton County, Georgia.
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 Alpharetta and Decatur.
Turn-by-Turn Driving Directions
Step-by-step road directions between Alpharetta and Decatur.
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1
Start on Academy Street
42 m · 11 sec · Academy Street
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2
Turn left onto South Main Street
1750 ft · 32 sec · South Main Street
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3
Turn left onto Old Milton Parkway
937 ft · 24 sec · Old Milton Parkway
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4
Turn right onto Haynes Bridge Road
1.1 mi · 2 min · Haynes Bridge Road
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5
Take the ramp slight right toward US 19 South, GA 400 South
2314 ft · 57 sec
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6
Merge slight left onto Turner McDonald Parkway
11 mi · 13 min · Turner McDonald Parkway
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7
Continue on T Harvey Mathis Parkway
6.2 mi · 8 min · T Harvey Mathis Parkway
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8
Take the exit slight right toward I 85 North: Greenville
1.2 km · 2 min
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9
Merge slight left onto Northeast Expressway
1.2 km · 1 min · Northeast Expressway
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10
Take the exit slight right toward GA 42: North Druid Hills Road
1148 ft · 28 sec
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11
Keep slight right to continue on GA 42 South: North Druid Hills Road
1073 ft · 26 sec
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12
Turn right onto North Druid Hills Road Northeast
2.1 mi · 4 min · North Druid Hills Road Northeast
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13
Turn right onto Clairmont Road
1.9 mi · 3 min · Clairmont Road
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14
Continue on Clairemont Avenue
1.1 mi · 2 min · Clairemont Avenue
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15
At the end of the road, turn left onto East Ponce de Leon Avenue
41 m · 5 sec · East Ponce de Leon Avenue
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16
Turn right onto East Court Square
69 m · 17 sec · East Court Square
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17
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between Alpharetta and Decatur.
Turn-heavy local drive
The route has frequent decision points for its length, so lane choice and turn timing will matter more than cruising speed.
Turner McDonald Parkway
Merge slight left onto Turner McDonald Parkway
11 mi · 00h 13m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A short regional drive
This route is short enough to handle as a quick errand, commute, or easy same-day return without much planning overhead.
Sunny leaving Alpharetta and Sunny near Decatur.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Alpharetta to Decatur?
The road trip is about 26.2 miles (42.1 km) and usually takes 00h 38m in normal driving conditions.
Is this a same-day trip or an overnight route?
This route is short enough to handle as a quick errand, commute, or easy same-day return without much planning overhead.
What is the halfway point on this route?
Sandy Springs is a useful midpoint, sitting about 13.1 miles from Alpharetta and 13 miles from Decatur.
How much longer is the road route than the straight-line distance?
The direct path is about 20.8 miles (33.4 km), while the road route adds roughly 5.4 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 7:00 AM to 7:00 PM EDT. If you want a more comfortable same-day return, try to leave by 7:14 PM EDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $3.64 one way or $7.29 round trip. Estimated CO2 is about 8.2 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around Alpharetta and Sunny near Decatur.
Stop Ideas Near Sandy Springs
Useful break, food, and waypoint ideas within about 15 miles of the route midpoint.
Cafe 55
Atlanta City Hall
Atlanta Revenue Bureau
Transit and Meeting Points
Useful pickup, handoff, or rendezvous points close to Sandy Springs.
Peachtree Station
Gainesville
Flight Path Map
This map shows the direct air route between Alpharetta and Decatur. Straight-line distance: 20.77 mi (33.42 km).
#1 Alpharetta
The most populous city in Fulton County, Georgia.
| Population | 67,897 |
| Coordinates | 34.0753800, -84.2940900 |
| Altitude | 347 |
| Country | United States |
#2 Decatur
County seat of DeKalb County, Georgia, United States
| Population | 25,655 |
| Coordinates | 33.7748300, -84.2963100 |
| Altitude | 318 |
| Country | United States |
End: Decatur (-84.29631, 33.77483)
Estimated Travel Time
Distance: 42 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 00h 52m |
| 40 mph (64.37 km/h) | 00h 39m |
| 50 mph (80.47 km/h) | 00h 31m |
| 60 mph (96.56 km/h) | 00h 26m |
| 70 mph (112.65 km/h) | 00h 22m |
| 80 mph (129 km/h) | 00h 19m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.96 | $3.64 | $7.29 |
| Mid-grade | $4.43 | $4.07 | $8.15 |
| Premium | $4.78 | $4.40 | $8.79 |
| Diesel | $5.62 | $5.17 | $10.35 |
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 23, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.