How far is Londonderry, NH from Merrimack, NH?
The driving distance from Londonderry, NH to Merrimack, NH is about 16.3 miles (26.3 km), with a travel time of about 00h 26m by car.
- The straight-line flight distance is about 6 miles (9.7 km).
- For a round trip, plan for roughly 00h 52m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 7:00 AM to 7:00 PM EDT.
Reverse, save, or send this route
This is an easy same-day return drive. Copy the route link, send it to another device, or print a clean version before you head out.
This is an easy same-day return drive.
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 26m.
This is a short drive, so your comfort window is wide. Traffic and current weather matter more than the clock.
This departure sits inside the recommended comfort window for the route.
Halfway Point
A useful midpoint for breaks, coffee, or meeting in the middle.
Census-designated place in Hillsborough County, New Hampshire
Route Weather Snapshot
Check the forecast at both ends before you head out.
Sunny
Driving Route Map
The map below follows the saved road route between Londonderry and Merrimack.
Turn-by-Turn Driving Directions
Step-by-step road directions between Londonderry and Merrimack.
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1
Start on Mammoth Road
2.4 mi · 5 min · Mammoth Road
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2
Turn left onto Litchfield Road
1.4 mi · 3 min · Litchfield Road
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3
Turn right onto High Range Road
1043 ft · 30 sec · High Range Road
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4
Continue on Harvey Road
1.1 mi · 2 min · Harvey Road
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5
At the end of the road, turn left onto Pettengill Road
1.1 mi · 3 min · Pettengill Road
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6
Turn left onto Raymond Wieczorek Drive
3081 ft · 59 sec · Raymond Wieczorek Drive
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7
Take the exit slight right toward Merrimack
2171 ft · 55 sec
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8
Turn left onto South River Road
2219 ft · 49 sec · South River Road
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9
Continue on Daniel Webster Highway
3.8 mi · 8 min · Daniel Webster Highway
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10
Turn slight left onto Loop Road
25 m · 4 sec · Loop Road
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11
Arrive at your destination
0 m · 1 sec · Loop Road
Car Route Details
A richer read on the saved driving route between Londonderry and Merrimack.
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.
Daniel Webster Highway
Continue on Daniel Webster Highway
3.75 mi · 00h 08m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A short regional drive
This route is short enough to handle as a quick errand, commute, or easy same-day return without much planning overhead.
Sunny leaving Londonderry and Sunny near Merrimack.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Londonderry to Merrimack?
The road trip is about 16.3 miles (26.3 km) and usually takes 00h 26m in normal driving conditions.
Is this a same-day trip or an overnight route?
This route is short enough to handle as a quick errand, commute, or easy same-day return without much planning overhead.
What is the halfway point on this route?
East Merrimack is a useful midpoint, sitting about 5.7 miles from Londonderry and 10.6 miles from Merrimack.
How much longer is the road route than the straight-line distance?
The direct path is about 6 miles (9.7 km), while the road route adds roughly 10.3 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 7:00 AM to 7:00 PM EDT. If you want a more comfortable same-day return, try to leave by 7:38 PM EDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $2.29 one way or $4.58 round trip. Estimated CO2 is about 5.2 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around Londonderry and Sunny near Merrimack.
Stop Ideas Near East Merrimack
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 East Merrimack.
Nashua, NH
Manchester, New Hampshire
Haverhill station
Concord, New Hampshire
Flight Path Map
This map shows the direct air route between Londonderry and Merrimack. Straight-line distance: 6.05 mi (9.74 km).
#1 Londonderry
Town in Rockingham County, New Hampshire, United States of America
| Population | 26,646 |
| Coordinates | 42.8650900, -71.3739500 |
| Altitude | 128 |
| Country | United States |
#2 Merrimack
River in New Hampshire and Massachusetts, United States
| Population | 27,452 |
| Coordinates | 42.8650900, -71.4934000 |
| Altitude | 47 |
| Country | United States |
End: (-71.493333, 42.865106)
Estimated Travel Time
Distance: 26 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 00h 32m |
| 40 mph (64.37 km/h) | 00h 24m |
| 50 mph (80.47 km/h) | 00h 19m |
| 60 mph (96.56 km/h) | 00h 16m |
| 70 mph (112.65 km/h) | 00h 14m |
| 80 mph (129 km/h) | 00h 12m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.95 | $2.29 | $4.58 |
| Mid-grade | $4.46 | $2.59 | $5.17 |
| Premium | $4.86 | $2.82 | $5.64 |
| Diesel | $6.00 | $3.48 | $6.96 |
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 12, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.