How far is Merrimack, NH from Portsmouth, NH?
The driving distance from Merrimack, NH to Portsmouth, NH is about 55.1 miles (88.6 km), with a travel time of about 00h 58m by car.
- The straight-line flight distance is about 40 miles (64.3 km).
- For a round trip, plan for roughly 01h 57m 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 00h 58m.
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 New Hampshire
Route Weather Snapshot
Check the forecast at both ends before you head out.
Mostly Cloudy
Chance Rain Showers then Partly Sunny
Driving Route Map
The map below follows the saved road route between Merrimack and Portsmouth.
Turn-by-Turn Driving Directions
Step-by-step road directions between Merrimack and Portsmouth.
-
1
Start on Loop Road
25 m · 6 sec · Loop Road
-
2
Turn straight onto Daniel Webster Highway
3.8 mi · 8 min · Daniel Webster Highway
-
3
Continue on South River Road
2135 ft · 46 sec · South River Road
-
4
Take the ramp right toward Concord, Nashua
2141 ft · 52 sec
-
5
Merge slight left onto Raymond Wieczorek Drive
653 ft · 11 sec · Raymond Wieczorek Drive
-
6
Keep slight right to continue on Bedford, Manchester
1.3 km · 2 min
-
7
Merge slight left onto Everett Turnpike
1.3 mi · 2 min · Everett Turnpike
-
8
Take the exit slight right toward I 293 South, NH 101 East: Exeter, Portsmouth
2925 ft · 1 min
-
9
Merge slight left
4.6 mi · 6 min
-
10
Keep slight right to continue on NH 101 East: Portsmouth, Seacoast
31.3 mi · 37 min
-
11
Take the exit slight right toward I 95: Portsmouth, Boston
1.3 km · 2 min
-
12
Keep slight left to continue on I 95 North: Portsmouth, Maine, Pease International Tradeport
2454 ft · 1 min
-
13
Continue straight
1816 ft · 44 sec
-
14
Merge slight left onto Blue Star Turnpike
7 mi · 8 min · Blue Star Turnpike
-
15
Keep slight right to continue on Blue Star Turnpike
1.9 mi · 3 min · Blue Star Turnpike
-
16
Take the exit slight right
1313 ft · 35 sec
-
17
Turn right onto Market Street
1 mi · 3 min · Market Street
-
18
At the end of the road, turn right onto Congress Street
16 m · 1 sec · Congress Street
-
19
Arrive at your destination
0 m · 1 sec · Congress Street
Car Route Details
A richer read on the saved driving route between Merrimack and Portsmouth.
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.
NH 101 East
Keep slight right to continue on NH 101 East: Portsmouth, Seacoast
31.3 mi · 00h 37m
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 Cloudy leaving Merrimack and Chance Rain Showers then Partly Sunny near Portsmouth.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Merrimack to Portsmouth?
The road trip is about 55.1 miles (88.6 km) and usually takes 00h 58m 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?
Raymond is a useful midpoint, sitting about 27.5 miles from Merrimack and 27.5 miles from Portsmouth.
How much longer is the road route than the straight-line distance?
The direct path is about 40 miles (64.3 km), while the road route adds roughly 15.1 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 4:32 PM EDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $7.65 one way or $15.31 round trip. Estimated CO2 is about 17.2 kg one way.
What should you check before leaving?
Before you leave, expect Mostly Cloudy around Merrimack and Chance Rain Showers then Partly Sunny near Portsmouth.
Stop Ideas Near Raymond
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 Raymond.
Exeter station
Durham–UNH station
Manchester, New Hampshire
Haverhill station
Flight Path Map
This map shows the direct air route between Merrimack and Portsmouth. Straight-line distance: 39.97 mi (64.33 km).
#1 Merrimack
River in New Hampshire and Massachusetts, United States
| Population | 27,452 |
| Coordinates | 42.8650900, -71.4934000 |
| Altitude | 47 |
| 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: 89 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 01h 50m |
| 40 mph (64.37 km/h) | 01h 22m |
| 50 mph (80.47 km/h) | 01h 06m |
| 60 mph (96.56 km/h) | 00h 55m |
| 70 mph (112.65 km/h) | 00h 47m |
| 80 mph (129 km/h) | 00h 41m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.95 | $7.65 | $15.31 |
| Mid-grade | $4.46 | $8.65 | $17.29 |
| Premium | $4.86 | $9.42 | $18.85 |
| Diesel | $6.00 | $11.63 | $23.27 |
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 · May 03, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.