How far is South Thomaston, ME from South Portland, ME?
The driving distance from South Thomaston, ME to South Portland, ME is about 81.4 miles (131 km), with a travel time of about 01h 37m by car.
- The straight-line flight distance is about 62.3 miles (100.2 km).
- For a round trip, plan for roughly 03h 15m 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 01h 37m.
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 of the United States
Route Weather Snapshot
Check the forecast at both ends before you head out.
Patchy Fog
Rain Showers
Driving Route Map
The map below follows the saved road route between South Thomaston and South Portland.
Turn-by-Turn Driving Directions
Step-by-step road directions between South Thomaston and South Portland.
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1
Start on Spruce Head Road
8 m · 1 sec · Spruce Head Road
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2
Turn right onto Westbrook Street
1.9 mi · 8 min · Westbrook Street
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3
At the end of the road, turn right onto Saint George Road
1.2 mi · 2 min · Saint George Road
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4
Continue on High Street
2593 ft · 58 sec · High Street
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5
At the end of the road, turn left onto Main Street
1.8 mi · 2 min · Main Street
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6
Continue on Atlantic Highway
13.4 mi · 18 min · Atlantic Highway
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7
Continue on Route 1
5.4 mi · 8 min · Route 1
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8
Continue on Route 1
8.7 mi · 12 min · Route 1
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9
Continue on Main Street
2605 ft · 1 min · Main Street
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10
Turn straight onto Bath Road
4 mi · 8 min · Bath Road
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11
Continue on Route 1
4.9 mi · 7 min · Route 1
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12
Continue on Main Street
1 mi · 2 min · Main Street
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13
Continue on Leeman Highway
9.2 mi · 13 min · Leeman Highway
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14
Turn right onto Pleasant Street
1.4 mi · 3 min · Pleasant Street
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15
Keep slight right
2443 ft · 42 sec
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16
Keep slight left to continue on I 295 South: Freeport, Portland
1.6 mi · 2 min
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17
Merge slight left
21.1 mi · 25 min
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18
Take the exit slight right toward US 1A
2130 ft · 1 min
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19
Turn right onto Marginal Way
2795 ft · 1 min · Marginal Way
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20
Continue on State Street
1.6 km · 2 min · State Street
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21
Continue on Casco Bay Bridge
1.1 mi · 2 min · Casco Bay Bridge
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22
Continue on Broadway
1.6 km · 2 min · Broadway
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23
Turn sharp right onto Pine Street
18 m · 3 sec · Pine Street
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24
Arrive at your destination
0 m · 1 sec · Pine Street
Car Route Details
A richer read on the saved driving route between South Thomaston and South Portland.
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 295 South
Merge slight left
21.1 mi · 00h 25m
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.
Patchy Fog leaving South Thomaston and Rain Showers near South Portland.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from South Thomaston to South Portland?
The road trip is about 81.4 miles (131 km) and usually takes 01h 37m 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?
Woolwich is a useful midpoint, sitting about 40.5 miles from South Thomaston and 40.8 miles from South Portland.
How much longer is the road route than the straight-line distance?
The direct path is about 62.3 miles (100.2 km), while the road route adds roughly 19.1 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 3:14 PM EDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $11.32 one way or $22.64 round trip. Estimated CO2 is about 25.5 kg one way.
What should you check before leaving?
Before you leave, expect Patchy Fog around South Thomaston and Rain Showers near South Portland.
Stop Ideas Near Woolwich
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 Woolwich.
Bath, Maine
Brunswick Maine Street Station
Wiscasset, Maine
Damariscotta, Maine
Flight Path Map
This map shows the direct air route between South Thomaston and South Portland. Straight-line distance: 62.28 mi (100.23 km).
#1 South Thomaston
City in Knox County, Maine, United States of America
| Population | 1,642 |
| Coordinates | 44.0514700, -69.1278200 |
| Altitude | 9 |
| Country | United States |
#2 South Portland
City in Cumberland County, Maine, USA
| Population | 25,950 |
| Coordinates | 43.6414700, -70.2408800 |
| Altitude | 7 |
| Country | United States |
End: Pine Street (-70.240981, 43.641461)
Estimated Travel Time
Distance: 131 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 02h 42m |
| 40 mph (64.37 km/h) | 02h 02m |
| 50 mph (80.47 km/h) | 01h 37m |
| 60 mph (96.56 km/h) | 01h 21m |
| 70 mph (112.65 km/h) | 01h 09m |
| 80 mph (129 km/h) | 01h 00m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.95 | $11.32 | $22.64 |
| Mid-grade | $4.46 | $12.79 | $25.58 |
| Premium | $4.86 | $13.94 | $27.88 |
| Diesel | $6.00 | $17.21 | $34.42 |
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 Maine · May 26, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.