How far is Swanzey, NH from Portsmouth, NH?
The driving distance from Swanzey, NH to Portsmouth, NH is about 113.8 miles (183.2 km), with a travel time of about 02h 00m by car.
- The straight-line flight distance is about 78.4 miles (126.1 km).
- For a round trip, plan for roughly 04h 00m 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 02h 00m.
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.
Route Weather Snapshot
Check the forecast at both ends before you head out.
Mostly Sunny
Sunny
Driving Route Map
The map below follows the saved road route between Swanzey and Portsmouth.
Turn-by-Turn Driving Directions
Step-by-step road directions between Swanzey and Portsmouth.
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1
Start on Old Homestead Highway
1578 ft · 32 sec · Old Homestead Highway
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2
Enter the roundabout and take exit 1 toward Old Homestead Highway
15 m · 1 sec · Old Homestead Highway
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3
Exit the roundabout onto Old Homestead Highway
2.5 mi · 4 min · Old Homestead Highway
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4
Turn right onto Lake Street
1975 ft · 54 sec · Lake Street
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5
Enter the roundabout and take exit 1 toward Monadnock Highway
8 m · 1 sec · Monadnock Highway
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6
Exit the roundabout onto Monadnock Highway
3.1 mi · 4 min · Monadnock Highway
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7
Continue on NH Route 12
1.5 mi · 2 min · NH Route 12
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8
Continue on North Main Street
2.6 mi · 3 min · North Main Street
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9
Merge slight left onto Central Square
578 ft · 8 sec · Central Square
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10
Keep slight right to continue on South Main Street
1106 ft · 14 sec · South Main Street
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11
Turn straight onto Fitzwilliam Road
1.2 mi · 1 min · Fitzwilliam Road
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12
Continue on NH Route 12 North
5.1 mi · 6 min · NH Route 12 North
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13
Continue on State Route 12
2.9 mi · 3 min · State Route 12
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14
Continue on School Street
3 mi · 3 min · School Street
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15
Turn left onto Front Street
1048 ft · 21 sec · Front Street
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16
Turn slight left onto Spring Street
2.3 mi · 3 min · Spring Street
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17
Continue on Gardner Road
3.4 mi · 4 min · Gardner Road
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18
Continue on Green Street
6.2 mi · 8 min · Green Street
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19
Take the exit slight right
11.7 mi · 17 min
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20
Keep slight left to continue on Concord Turnpike
12.3 mi · 17 min · Concord Turnpike
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21
Take the exit slight right toward I 495 North: Lowell
2445 ft · 59 sec
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22
Keep slight left to continue on I 495 North: Lowell, Lawrence
974 ft · 24 sec
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23
Merge slight left
42.9 mi · 50 min
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24
Merge slight left
6.7 mi · 8 min
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25
Keep slight left to continue on Blue Star Turnpike
7.8 mi · 9 min · Blue Star Turnpike
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26
Keep slight right to continue on Blue Star Turnpike
1.9 mi · 3 min · Blue Star Turnpike
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27
Take the exit slight right
1313 ft · 35 sec
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28
Turn right onto Market Street
1 mi · 3 min · Market Street
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29
At the end of the road, turn right onto Congress Street
16 m · 1 sec · Congress Street
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30
Arrive at your destination
0 m · 1 sec · Congress Street
Car Route Details
A richer read on the saved driving route between Swanzey and Portsmouth.
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 495 North
Merge slight left
42.9 mi · 00h 50m
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.
Mostly Sunny leaving Swanzey and Sunny near Portsmouth.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Swanzey to Portsmouth?
The road trip is about 113.8 miles (183.2 km) and usually takes 02h 00m 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?
Hollis is a useful midpoint, sitting about 60 miles from Swanzey and 53.8 miles from Portsmouth.
How much longer is the road route than the straight-line distance?
The direct path is about 78.4 miles (126.1 km), while the road route adds roughly 35.4 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 2:30 PM EDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $17.26 one way or $34.52 round trip. Estimated CO2 is about 35.7 kg one way.
What should you check before leaving?
Before you leave, expect Mostly Sunny around Swanzey and Sunny near Portsmouth.
Stop Ideas Near Hollis
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 Hollis.
Nashua, NH
Manchester, New Hampshire
Haverhill station
Anderson Regional Transportation Center
Flight Path Map
This map shows the direct air route between Swanzey and Portsmouth. Straight-line distance: 78.37 mi (126.12 km).
#1 Swanzey
City in Cheshire County, New Hampshire, United States of America
| Population | 7,271 |
| Coordinates | 42.8698000, -72.2817500 |
| Altitude | 149 |
| Country | United States |
#2 Portsmouth
City in Rockingham County, New Hampshire, United States
| Population | 21,557 |
| Coordinates | 43.0770400, -70.7576600 |
| Altitude | 6 |
| Country | United States |
End: Congress Street (-70.757617, 43.077054)
Estimated Travel Time
Distance: 183 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 03h 47m |
| 40 mph (64.37 km/h) | 02h 50m |
| 50 mph (80.47 km/h) | 02h 16m |
| 60 mph (96.56 km/h) | 01h 53m |
| 70 mph (112.65 km/h) | 01h 37m |
| 80 mph (129 km/h) | 01h 25m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $4.29 | $17.26 | $34.52 |
| Mid-grade | $4.88 | $19.63 | $39.27 |
| Premium | $5.34 | $21.45 | $42.91 |
| Diesel | $6.35 | $25.54 | $51.07 |
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 New Hampshire · Oct 15, 2026