How far is Smithfield, RI from Portsmouth, NH?
The driving distance from Smithfield, RI to Portsmouth, NH is about 109.1 miles (175.5 km), with a travel time of about 02h 20m by car.
- The straight-line flight distance is about 89.4 miles (143.9 km).
- For a round trip, plan for roughly 04h 41m 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 20m.
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 Middlesex County, Massachusetts, United States
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 Smithfield and Portsmouth.
Turn-by-Turn Driving Directions
Step-by-step road directions between Smithfield and Portsmouth.
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1
Start on Brayton Road
7 m · 5 sec · Brayton Road
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2
Turn right onto Farnum Pike
1.3 mi · 2 min · Farnum Pike
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3
At the end of the road, turn left onto Douglas Pike
44 m · 3 sec · Douglas Pike
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4
Continue on Douglas Turnpike
1052 ft · 18 sec · Douglas Turnpike
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5
Turn straight onto Greenville Road
4 mi · 8 min · Greenville Road
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6
Continue on Providence Street
1.2 km · 1 min · Providence Street
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7
At the end of the road, turn right onto South Main Street
2131 ft · 43 sec · South Main Street
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8
Turn right onto Bernon Street
113 m · 7 sec · Bernon Street
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9
Enter the roundabout and take exit 2 toward Truman Drive
42 m · 3 sec · Truman Drive
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10
Exit the roundabout onto Truman Drive
2414 ft · 51 sec · Truman Drive
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11
Turn right onto Clinton Street
3173 ft · 54 sec · Clinton Street
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12
Turn straight onto Social Street
2954 ft · 1 min · Social Street
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13
Continue on Pulaski Boulevard
1.2 km · 2 min · Pulaski Boulevard
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14
Turn left onto South Main Street
4.6 mi · 8 min · South Main Street
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15
Turn left onto Mechanic Street
49 m · 3 sec · Mechanic Street
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16
Continue on North Main Street
1.9 mi · 4 min · North Main Street
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17
Turn right onto Hartford Avenue
2459 ft · 1 min · Hartford Avenue
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18
Take the ramp slight right
1318 ft · 32 sec
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19
Merge slight left
75 mi · 1 hr 27 min
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20
Merge slight left
6.7 mi · 8 min
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21
Keep slight left to continue on Blue Star Turnpike
7.8 mi · 9 min · Blue Star Turnpike
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22
Keep slight right to continue on Blue Star Turnpike
1.9 mi · 3 min · Blue Star Turnpike
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23
Take the exit slight right
1313 ft · 35 sec
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24
Turn right onto Market Street
1 mi · 3 min · Market Street
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25
At the end of the road, turn right onto Congress Street
16 m · 1 sec · Congress Street
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26
Arrive at your destination
0 m · 1 sec · Congress Street
Car Route Details
A richer read on the saved driving route between Smithfield and Portsmouth.
Interchange-aware route
The drive includes several ramps, exits, or merges, so checking the next few maneuvers before busy interchanges is useful.
Hartford Avenue
Merge slight left
75 mi · 01h 27m
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 Smithfield and Sunny near Portsmouth.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Smithfield to Portsmouth?
The road trip is about 109.1 miles (175.5 km) and usually takes 02h 20m 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?
Westford is a useful midpoint, sitting about 54.5 miles from Smithfield and 54.6 miles from Portsmouth.
How much longer is the road route than the straight-line distance?
The direct path is about 89.4 miles (143.9 km), while the road route adds roughly 19.7 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 1:48 PM EDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $15.19 one way or $30.38 round trip. Estimated CO2 is about 34.2 kg one way.
What should you check before leaving?
Before you leave, expect Mostly Sunny around Smithfield and Sunny near Portsmouth.
Stop Ideas Near Westford
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 Westford.
Nashua, NH
Anderson Regional Transportation Center
Framingham station
Haverhill station
Flight Path Map
This map shows the direct air route between Smithfield and Portsmouth. Straight-line distance: 89.42 mi (143.9 km).
#1 Smithfield
County seat of Johnston County, North Carolina
| Population | 21,842 |
| Coordinates | 41.9220400, -71.5495100 |
| Altitude | 84 |
| 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: Portsmouth (-70.75766, 43.07704)
Estimated Travel Time
Distance: 175 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 03h 38m |
| 40 mph (64.37 km/h) | 02h 43m |
| 50 mph (80.47 km/h) | 02h 10m |
| 60 mph (96.56 km/h) | 01h 49m |
| 70 mph (112.65 km/h) | 01h 33m |
| 80 mph (129 km/h) | 01h 21m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.95 | $15.19 | $30.38 |
| Mid-grade | $4.46 | $17.16 | $34.32 |
| Premium | $4.86 | $18.70 | $37.41 |
| Diesel | $6.00 | $23.09 | $46.18 |
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 Rhode Island · Jul 17, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.