How far is Duncan, SC from Summerville, SC?
The driving distance from Duncan, SC to Summerville, SC is about 189.5 miles (304.9 km), with a travel time of about 02h 59m by car.
- The straight-line flight distance is about 174.1 miles (280.2 km).
- For a round trip, plan for roughly 05h 58m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 8:00 AM to 10:00 AM EDT.
Reverse, save, or send this route
This route works well as a day trip with time at the destination. Copy the route link, send it to another device, or print a clean version before you head out.
This route works well as a day trip with time at the destination.
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 02h 59m.
A morning start gives you useful time at the destination and keeps the return out of the late evening.
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.
Town on the east coast of Fife in Scotland
Route Weather Snapshot
Check the forecast at both ends before you head out.
Sunny
Driving Route Map
The map below follows the saved road route between Duncan and Summerville.
Turn-by-Turn Driving Directions
Step-by-step road directions between Duncan and Summerville.
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1
Start on South Spencer Street
39 m · 5 sec · South Spencer Street
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2
Turn right onto West Main Street
5.8 mi · 12 min · West Main Street
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3
Continue on Moore Duncan Highway
6.2 mi · 10 min · Moore Duncan Highway
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4
Turn left onto Highway 221
1.3 km · 1 min · Highway 221
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5
Take the ramp right
797 ft · 19 sec
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6
Merge slight left
79.4 mi · 1 hr 27 min
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7
Keep slight right to continue on Charleston
90.9 mi · 1 hr 39 min
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8
Take the exit slight right toward US 17 Alternate South: Summerville
1450 ft · 35 sec
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9
Turn straight onto North Main Street
2 mi · 3 min · North Main Street
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10
Turn left onto East Richardson Avenue
35 m · 5 sec · East Richardson Avenue
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11
Turn right
28 m · 7 sec
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12
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between Duncan and Summerville.
Straightforward drive
The saved road route has a manageable number of maneuvers and should be easy to follow with normal attention to signs.
Charleston
Keep slight right to continue on Charleston
90.9 mi · 01h 39m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A comfortable day-trip route
This route works well as a day trip. You can leave in the morning, spend meaningful time at the destination, and still return the same day.
Sunny leaving Duncan and Sunny near Summerville.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Duncan to Summerville?
The road trip is about 189.5 miles (304.9 km) and usually takes 02h 59m in normal driving conditions.
Is this a same-day trip or an overnight route?
This route works well as a day trip. You can leave in the morning, spend meaningful time at the destination, and still return the same day.
What is the halfway point on this route?
Saint Andrews is a useful midpoint, sitting about 92.8 miles from Duncan and 96.6 miles from Summerville.
How much longer is the road route than the straight-line distance?
The direct path is about 174.1 miles (280.2 km), while the road route adds roughly 15.4 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 8:00 AM to 10:00 AM EDT. If you want a more comfortable same-day return, try to leave by 12:32 PM EDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $26.50 one way or $53.00 round trip. Estimated CO2 is about 59.5 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around Duncan and Sunny near Summerville.
Stop Ideas Near Saint Andrews
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 Saint Andrews.
Columbia
Camden
Denmark
Flight Path Map
This map shows the direct air route between Duncan and Summerville. Straight-line distance: 174.12 mi (280.22 km).
#1 Duncan
Human settlement in Spartanburg County, South Carolina, United States of America
| Population | 3,715 |
| Coordinates | 34.9379000, -82.1451100 |
| Altitude | 264 |
| Country | United States |
#2 Summerville
Town in South Carolina, United States
| Population | 53,301 |
| Coordinates | 33.0185000, -80.1756500 |
| Altitude | 27 |
| Country | United States |
End: East Richardson Avenue (-80.1755, 33.018698)
Estimated Travel Time
Distance: 305 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 06h 18m |
| 40 mph (64.37 km/h) | 04h 44m |
| 50 mph (80.47 km/h) | 03h 47m |
| 60 mph (96.56 km/h) | 03h 09m |
| 70 mph (112.65 km/h) | 02h 42m |
| 80 mph (129 km/h) | 02h 21m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.96 | $26.50 | $53.00 |
| Mid-grade | $4.43 | $29.63 | $59.26 |
| Premium | $4.78 | $31.96 | $63.93 |
| Diesel | $5.62 | $37.62 | $75.25 |
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 South Carolina · May 04, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.