How far is South Portland, ME from Deer Isle, ME?
The driving distance from South Portland, ME to Deer Isle, ME is about 156.6 miles (252.1 km), with a travel time of about 03h 27m by car.
- The straight-line flight distance is about 87.6 miles (140.9 km).
- For a round trip, plan for roughly 06h 55m 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 27m.
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.
Mostly Sunny then Showers And Thunderstorms Likely
Mostly Sunny
Driving Route Map
The map below follows the saved road route between South Portland and Deer Isle.
Turn-by-Turn Driving Directions
Step-by-step road directions between South Portland and Deer Isle.
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1
Start on Pine Street
18 m · 10 sec · Pine Street
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2
Turn sharp left onto Broadway
1.6 km · 2 min · Broadway
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3
Continue on Casco Bay Bridge
1.1 mi · 2 min · Casco Bay Bridge
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4
Turn straight onto York Street
785 ft · 19 sec · York Street
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5
Turn left onto High Street
1.4 km · 2 min · High Street
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6
Take the ramp slight right toward I 295 North, US 1 North: Falmouth
1360 ft · 33 sec
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7
Merge slight left
46.8 mi · 53 min
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8
Merge slight left onto Maine Turnpike
9.8 mi · 11 min · Maine Turnpike
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9
Take the exit slight right toward ME 3: Augusta, Belfast
767 ft · 26 sec
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10
Keep slight right
834 ft · 20 sec
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11
Merge slight left onto Augusta Bypass
2.5 mi · 4 min · Augusta Bypass
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12
Continue on North Belfast Avenue
8.1 mi · 12 min · North Belfast Avenue
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13
Continue on Belfast Road
1077 ft · 17 sec · Belfast Road
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14
Continue on Route 3
17.6 mi · 21 min · Route 3
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15
Continue on Acadia Highway
4 mi · 4 min · Acadia Highway
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16
Continue on Belfast Augusta Road West
3.4 mi · 4 min · Belfast Augusta Road West
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17
Continue on Augusta Road
4.8 mi · 5 min · Augusta Road
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18
Continue on Belmont Avenue
4 mi · 5 min · Belmont Avenue
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19
Take the exit left
1586 ft · 44 sec
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20
Merge slight left onto Route 1
1.1 km · 1 min · Route 1
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21
Continue on Searsport Avenue
2.7 mi · 5 min · Searsport Avenue
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22
Continue on West Main Street
7 mi · 8 min · West Main Street
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23
Keep slight right to continue on East Main Street
6.3 mi · 8 min · East Main Street
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24
Continue on US Highway 1
1.2 mi · 3 min · US Highway 1
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25
Continue on Route 1
155 m · 12 sec · Route 1
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26
Continue on Route 1
1 mi · 1 min · Route 1
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27
Continue on Acadia Highway
3.4 mi · 4 min · Acadia Highway
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28
Turn right onto Front Ridge Road
3.7 mi · 6 min · Front Ridge Road
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29
Turn right onto North Penobscot Road
5 mi · 9 min · North Penobscot Road
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30
At the end of the road, turn left onto Southern Bay Road
4.6 mi · 8 min · Southern Bay Road
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31
Continue on Graytown Road
2.6 mi · 5 min · Graytown Road
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32
Continue on Snows Cove Road
2.9 mi · 5 min · Snows Cove Road
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33
Continue on Caterpillar Hill Road
2.9 mi · 5 min · Caterpillar Hill Road
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34
At the end of the road, turn right onto Byards Point Road
1.3 mi · 2 min · Byards Point Road
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35
Continue on Deer Isle Sedgwick Bridge
2510 ft · 50 sec · Deer Isle Sedgwick Bridge
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36
Continue on Little Deer Isle Road
1.5 km · 2 min · Little Deer Isle Road
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37
Continue on North Deer Isle Road
4.6 mi · 8 min · North Deer Isle Road
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38
Turn left onto King Row
41 m · 6 sec · King Row
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39
Arrive at your destination
0 m · 1 sec · King Row
Car Route Details
A richer read on the saved driving route between South Portland and Deer Isle.
Interchange-aware route
The drive includes several ramps, exits, or merges, so checking the next few maneuvers before busy interchanges is useful.
I 295 North
Merge slight left
46.8 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.
Mostly Sunny then Showers And Thunderstorms Likely leaving South Portland and Mostly Sunny near Deer Isle.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from South Portland to Deer Isle?
The road trip is about 156.6 miles (252.1 km) and usually takes 03h 27m 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 78.2 miles from South Portland and 78.4 miles from Deer Isle.
How much longer is the road route than the straight-line distance?
The direct path is about 87.6 miles (140.9 km), while the road route adds roughly 69 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 10:04 AM EDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $21.82 one way or $43.63 round trip. Estimated CO2 is about 49.1 kg one way.
What should you check before leaving?
Before you leave, expect Mostly Sunny then Showers And Thunderstorms Likely around South Portland and Mostly Sunny near Deer Isle.
Stop Ideas Near Palermo
Useful break, food, and waypoint ideas within about 15 miles of the route midpoint.
Waterville Opera House
Sidney Town Hall
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 South Portland and Deer Isle. Straight-line distance: 87.58 mi (140.95 km).
#1 South Portland
City in Cumberland County, Maine, USA
| Population | 25,950 |
| Coordinates | 43.6414700, -70.2408800 |
| Altitude | 7 |
| Country | United States |
#2 Deer Isle
Town in Hancock County, Maine, United States
| Population | 1,911 |
| Coordinates | 44.2239700, -68.6775300 |
| Altitude | 12 |
| Country | United States |
End: Deer Isle (-68.67753, 44.22397)
Estimated Travel Time
Distance: 252 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 05h 13m |
| 40 mph (64.37 km/h) | 03h 54m |
| 50 mph (80.47 km/h) | 03h 07m |
| 60 mph (96.56 km/h) | 02h 36m |
| 70 mph (112.65 km/h) | 02h 14m |
| 80 mph (129 km/h) | 01h 57m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.95 | $21.82 | $43.63 |
| Mid-grade | $4.46 | $24.65 | $49.29 |
| Premium | $4.86 | $26.86 | $53.73 |
| Diesel | $6.00 | $33.16 | $66.33 |
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 31, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.