How far is Stonington, ME from South Portland, ME?
The driving distance from Stonington, ME to South Portland, ME is about 163.7 miles (263.4 km), with a travel time of about 03h 12m by car.
- The straight-line flight distance is about 86.1 miles (138.5 km).
- For a round trip, plan for roughly 06h 25m 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 12m.
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 in Waldo County, Maine, United States of America
Route Weather Snapshot
Check the forecast at both ends before you head out.
Patchy Fog then Partly Sunny
Mostly Cloudy
Driving Route Map
The map below follows the saved road route between Stonington and South Portland.
Turn-by-Turn Driving Directions
Step-by-step road directions between Stonington and South Portland.
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1
Start on Church Street
34 m · 8 sec · Church Street
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2
Turn right onto School Street
102 m · 16 sec · School Street
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3
Turn left onto Main Street
1087 ft · 22 sec · Main Street
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4
Continue on Thurlows Hill Road
547 ft · 11 sec · Thurlows Hill Road
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5
Continue on North Main Street
1.5 mi · 3 min · North Main Street
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6
Continue on North Stonington Road
1.6 km · 2 min · North Stonington Road
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7
Continue on South Deer Isle Road
2.6 mi · 4 min · South Deer Isle Road
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8
Continue on Church Street
2576 ft · 51 sec · Church Street
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9
Continue on North Deer Isle Road
4.6 mi · 8 min · North Deer Isle Road
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10
Continue on Little Deer Isle Road
1.5 km · 2 min · Little Deer Isle Road
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11
Continue on Deer Isle Sedgwick Bridge
2510 ft · 50 sec · Deer Isle Sedgwick Bridge
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12
Continue on Byards Point Road
1.3 mi · 2 min · Byards Point Road
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13
Turn left onto Caterpillar Hill Road
2.9 mi · 5 min · Caterpillar Hill Road
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14
Continue on Snows Cove Road
2.9 mi · 5 min · Snows Cove Road
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15
Continue on Graytown Road
2.6 mi · 5 min · Graytown Road
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16
Continue on Southern Bay Road
4.6 mi · 8 min · Southern Bay Road
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17
Turn right onto North Penobscot Road
5 mi · 9 min · North Penobscot Road
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18
At the end of the road, turn left onto Front Ridge Road
3.7 mi · 6 min · Front Ridge Road
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19
At the end of the road, turn left onto Acadia Highway
3.4 mi · 4 min · Acadia Highway
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20
Continue on Route 1
1.6 km · 1 min · Route 1
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21
Continue on Main Street
41 m · 9 sec · Main Street
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22
Turn left onto Route 1
682 ft · 17 sec · Route 1
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23
Continue on US Highway 1
1.2 mi · 3 min · US Highway 1
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24
Continue on Route 1
13.4 mi · 16 min · Route 1
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25
Continue on Searsport Avenue
2.7 mi · 5 min · Searsport Avenue
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26
Continue on Route 1
1.1 km · 1 min · Route 1
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27
Take the exit slight right
1414 ft · 39 sec
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28
Keep slight right
114 m · 12 sec
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29
Merge slight left onto Belmont Avenue
3.9 mi · 5 min · Belmont Avenue
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30
Continue on Augusta Road
4.8 mi · 5 min · Augusta Road
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31
Continue on Belfast Augusta Road East
3.4 mi · 4 min · Belfast Augusta Road East
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32
Continue on Acadia Highway
4 mi · 4 min · Acadia Highway
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33
Continue on Belfast Augusta Road
17.6 mi · 21 min · Belfast Augusta Road
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34
Continue on Belfast Road
1077 ft · 17 sec · Belfast Road
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35
Continue on North Belfast Avenue
8.1 mi · 12 min · North Belfast Avenue
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36
Turn left onto North Belfast Avenue
1.6 km · 2 min · North Belfast Avenue
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37
At the end of the road, turn left onto Bangor Street
2936 ft · 53 sec · Bangor Street
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38
Enter the roundabout and take exit 2 toward Cony Circle
49 m · 3 sec · Memorial Drive
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39
Exit the rotary onto Memorial Drive
1.1 km · 2 min · Memorial Drive
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40
Enter the roundabout and take exit 3 toward Memorial Circle
122 m · 7 sec · State Street
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41
Exit the rotary onto State Street
1007 ft · 19 sec · State Street
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42
Turn right onto Capitol Street
1.3 km · 1 min · Capitol Street
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43
Turn straight onto Armory Street
915 ft · 20 sec · Armory Street
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44
Turn left onto Western Avenue
1.1 km · 1 min · Western Avenue
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45
Take the exit slight right toward I 95: Portland, Waterville, Bangor
1829 ft · 44 sec
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46
Keep slight left to continue on I-95 South: Portland, Kittery
3262 ft · 1 min
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47
Merge slight left onto Maine Turnpike
5.9 mi · 6 min · Maine Turnpike
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48
Keep slight right to continue on I 295 South, ME 9, ME 126: Gardiner, Brunswick
46.5 mi · 53 min
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49
Take the exit slight right toward US 1A
2130 ft · 1 min
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50
Turn right onto Marginal Way
2795 ft · 1 min · Marginal Way
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51
Continue on State Street
1.6 km · 2 min · State Street
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52
Continue on Casco Bay Bridge
1.1 mi · 2 min · Casco Bay Bridge
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53
Continue on Broadway
1.6 km · 2 min · Broadway
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54
Turn sharp right onto Pine Street
18 m · 3 sec · Pine Street
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55
Arrive at your destination
0 m · 1 sec · Pine Street
Car Route Details
A richer read on the saved driving route between Stonington and South Portland.
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.
I 295 South
Keep slight right to continue on I 295 South, ME 9, ME 126: Gardiner, Brunswick
46.5 mi · 00h 53m
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.
Patchy Fog then Partly Sunny leaving Stonington and Mostly Cloudy near South Portland.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Stonington to South Portland?
The road trip is about 163.7 miles (263.4 km) and usually takes 03h 12m 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?
Palermo is a useful midpoint, sitting about 80.5 miles from Stonington and 83.1 miles from South Portland.
How much longer is the road route than the straight-line distance?
The direct path is about 86.1 miles (138.5 km), while the road route adds roughly 77.6 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 10:34 AM EDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $22.76 one way or $45.53 round trip. Estimated CO2 is about 51.3 kg one way.
What should you check before leaving?
Before you leave, expect Patchy Fog then Partly Sunny around Stonington and Mostly Cloudy near South Portland.
Stop Ideas Near Palermo
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 Palermo.
Augusta, ME
Waldoboro, Maine
Belfast, Maine
Camden/Rockport, Maine
Flight Path Map
This map shows the direct air route between Stonington and South Portland. Straight-line distance: 86.06 mi (138.5 km).
#1 Stonington
Town in New London County, Connecticut, United States
| Population | 1,033 |
| Coordinates | 44.1561900, -68.6666900 |
| Altitude | 22 |
| 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: 263 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 05h 27m |
| 40 mph (64.37 km/h) | 04h 05m |
| 50 mph (80.47 km/h) | 03h 16m |
| 60 mph (96.56 km/h) | 02h 43m |
| 70 mph (112.65 km/h) | 02h 20m |
| 80 mph (129 km/h) | 02h 02m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.95 | $22.76 | $45.53 |
| Mid-grade | $4.46 | $25.72 | $51.43 |
| Premium | $4.86 | $28.03 | $56.06 |
| Diesel | $6.00 | $34.60 | $69.21 |
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 · Apr 18, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.