How far is Summerville, SC from Duncan, SC?
The driving distance from Summerville, SC to Duncan, SC is about 186.1 miles (299.5 km), with a travel time of about 03h 32m by car.
- The straight-line flight distance is about 174.1 miles (280.2 km).
- For a round trip, plan for roughly 07h 05m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 6:00 AM to 8:00 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 03h 32m.
An early departure helps you fit a real stop into the day without turning the return into a late-night drive.
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.
Driving Route Map
The map below follows the saved road route between Summerville and Duncan.
Turn-by-Turn Driving Directions
Step-by-step road directions between Summerville and Duncan.
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1
Start on the route
28 m · 12 sec
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2
Turn left onto East Richardson Avenue
35 m · 7 sec · East Richardson Avenue
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3
Turn right onto North Main Street
2.2 mi · 4 min · North Main Street
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4
Take the ramp slight left toward I-26 West
2191 ft · 56 sec
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5
Merge slight left
146.8 mi · 2 hr 39 min
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6
Keep slight right to continue on Spartanburg
23.5 mi · 25 min
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7
Take the exit slight right toward US 221: Spartanburg-South, Moore
1139 ft · 28 sec
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8
Turn slight left
29 m · 2 sec
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9
Turn left onto Highway 221
1.5 km · 2 min · Highway 221
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10
Turn right onto Moore Duncan Highway
6.2 mi · 10 min · Moore Duncan Highway
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11
Continue on East Main Street
5.8 mi · 12 min · East Main Street
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12
Turn left onto South Spencer Street
39 m · 3 sec · South Spencer Street
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13
Arrive at your destination
0 m · 1 sec · South Spencer Street
Car Route Details
A richer read on the saved driving route between Summerville and Duncan.
Highway-focused drive
Most of the mileage stays on named highways, so the important moments are ramps, exits, merges, and the final local approach.
I-26 West
Merge slight left
147 mi · 02h 39m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A longer out-and-back drive
This is still possible in one day, but it becomes a long driving day. Leaving early and planning your stop window matters more here.
Sunny leaving Summerville and Sunny near Duncan.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Summerville to Duncan?
The road trip is about 186.1 miles (299.5 km) and usually takes 03h 32m in normal driving conditions.
Is this a same-day trip or an overnight route?
This is still possible in one day, but it becomes a long driving day. Leaving early and planning your stop window matters more here.
What is the halfway point on this route?
Saint Andrews is a useful midpoint, sitting about 93.1 miles from Summerville and 93 miles from Duncan.
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 12 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 8:00 AM EDT. If you want a more comfortable same-day return, try to leave by 9:54 AM EDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $26.02 one way or $52.05 round trip. Estimated CO2 is about 58.4 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around Summerville and Sunny near Duncan.
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 Summerville and Duncan. Straight-line distance: 174.12 mi (280.22 km).
#1 Summerville
Town in South Carolina, United States
| Population | 53,301 |
| Coordinates | 33.0185000, -80.1756500 |
| Altitude | 27 |
| Country | United States |
#2 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 |
End: Duncan (-82.14511, 34.9379)
Estimated Travel Time
Distance: 300 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 06h 12m |
| 40 mph (64.37 km/h) | 04h 39m |
| 50 mph (80.47 km/h) | 03h 43m |
| 60 mph (96.56 km/h) | 03h 06m |
| 70 mph (112.65 km/h) | 02h 39m |
| 80 mph (129 km/h) | 02h 19m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.96 | $26.02 | $52.05 |
| Mid-grade | $4.43 | $29.10 | $58.20 |
| Premium | $4.78 | $31.39 | $62.78 |
| Diesel | $5.62 | $36.95 | $73.90 |
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.