How far is South Portland, ME from Union, ME?
The driving distance from South Portland, ME to Union, ME is about 81.1 miles (130.5 km), with a travel time of about 01h 47m by car.
- The straight-line flight distance is about 62.2 miles (100.1 km).
- For a round trip, plan for roughly 03h 34m 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 47m.
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 in Maine, United States of America
Route Weather Snapshot
Check the forecast at both ends before you head out.
Areas Of Fog
Driving Route Map
The map below follows the saved road route between South Portland and Union.
Turn-by-Turn Driving Directions
Step-by-step road directions between South Portland and Union.
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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
45.6 mi · 51 min
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8
Take the exit slight right toward ME 9, ME 126: Litchfield, Gardiner
1774 ft · 50 sec
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9
Turn right onto Lewiston Road
1.1 mi · 2 min · Lewiston Road
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10
Continue on Cobbossee Avenue
1.1 km · 60 sec · Cobbossee Avenue
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11
Continue on Lewiston Road
642 ft · 11 sec · Lewiston Road
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12
Continue on Central Street
916 ft · 15 sec · Central Street
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13
Turn straight onto Water Street
1.4 km · 1 min · Water Street
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14
Turn left onto Bridge Street
2616 ft · 49 sec · Bridge Street
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15
At the end of the road, turn right onto Water Street
974 ft · 34 sec · Water Street
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16
Turn left onto Windsor Street
1.7 mi · 3 min · Windsor Street
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17
Continue on Togus Road
3.7 mi · 7 min · Togus Road
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18
At the end of the road, turn right onto Augusta Road
3098 ft · 53 sec · Augusta Road
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19
Continue on Eastern Avenue
1.1 mi · 2 min · Eastern Avenue
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20
Continue on Augusta Road
1.5 km · 1 min · Augusta Road
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21
Continue on Augusta-Rockland Road
4.1 mi · 6 min · Augusta-Rockland Road
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22
Continue on Rockland Road
1.3 mi · 2 min · Rockland Road
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23
Continue on Rockland Road
4.9 mi · 7 min · Rockland Road
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24
Continue on Augusta Road
3.5 mi · 5 min · Augusta Road
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25
Continue on Rockland Road
2.2 mi · 3 min · Rockland Road
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26
Continue on Heald Highway
3.3 mi · 5 min · Heald Highway
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27
Turn right onto Common Road
3192 ft · 1 min · Common Road
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28
Arrive at your destination
0 m · 1 sec · Common Road
Car Route Details
A richer read on the saved driving route between South Portland and Union.
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 North
Merge slight left
45.6 mi · 00h 51m
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.
Areas Of Fog leaving South Portland and Areas Of Fog near Union.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from South Portland to Union?
The road trip is about 81.1 miles (130.5 km) and usually takes 01h 47m 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?
Richmond is a useful midpoint, sitting about 40.5 miles from South Portland and 40.6 miles from Union.
How much longer is the road route than the straight-line distance?
The direct path is about 62.2 miles (100.1 km), while the road route adds roughly 18.9 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 2:56 PM EDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $11.28 one way or $22.57 round trip. Estimated CO2 is about 25.4 kg one way.
What should you check before leaving?
Before you leave, expect Areas Of Fog around South Portland and Areas Of Fog near Union.
Stop Ideas Near Richmond
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 Richmond.
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Flight Path Map
This map shows the direct air route between South Portland and Union. Straight-line distance: 62.17 mi (100.05 km).
#1 South Portland
City in Cumberland County, Maine, USA
| Population | 25,950 |
| Coordinates | 43.6414700, -70.2408800 |
| Altitude | 7 |
| Country | United States |
#2 Union
Town in Knox County, Maine, United States
| Population | 2,275 |
| Coordinates | 44.2114700, -69.2742100 |
| Altitude | 28 |
| Country | United States |
End: Union (-69.27421, 44.21147)
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 01m |
| 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 | $11.28 | $22.57 |
| Mid-grade | $4.46 | $12.75 | $25.49 |
| Premium | $4.86 | $13.89 | $27.79 |
| Diesel | $6.00 | $17.15 | $34.30 |
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 15, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.