How far is Thornton, NH from Merrimack, NH?
The driving distance from Thornton, NH to Merrimack, NH is about 79.2 miles (127.5 km), with a travel time of about 01h 18m by car.
- The straight-line flight distance is about 71.6 miles (115.2 km).
- For a round trip, plan for roughly 02h 37m 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 18m.
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.
Human settlement in United States of America
Route Weather Snapshot
Check the forecast at both ends before you head out.
Slight Chance Snow Showers then Mostly Cloudy
Slight Chance Rain Showers
Driving Route Map
The map below follows the saved road route between Thornton and Merrimack.
Turn-by-Turn Driving Directions
Step-by-step road directions between Thornton and Merrimack.
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1
Start on Daniel Webster Highway
1.9 mi · 3 min · Daniel Webster Highway
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2
Take the ramp slight right toward I 93 South
2000 ft · 49 sec
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3
Merge slight left onto Styles Bridges Highway
34.1 mi · 37 min · Styles Bridges Highway
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4
Continue on Senator Styles Bridges Highway
15.4 mi · 18 min · Senator Styles Bridges Highway
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5
Continue on Styles Bridges Highway
1.2 km · 1 min · Styles Bridges Highway
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6
Continue on Everett Turnpike
8.9 mi · 11 min · Everett Turnpike
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7
Keep slight left to continue on Everett Turnpike
2 mi · 2 min · Everett Turnpike
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8
Keep slight left to continue on Everett Turnpike
8.2 mi · 11 min · Everett Turnpike
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9
Keep slight left to continue on Everett Turnpike
2.4 mi · 3 min · Everett Turnpike
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10
Take the exit slight right toward Airport
1.3 km · 1 min
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11
Keep slight right to continue on Merrimack
1425 ft · 38 sec
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12
Turn right onto South River Road
704 ft · 13 sec · South River Road
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13
Continue on Daniel Webster Highway
3.8 mi · 9 min · Daniel Webster Highway
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14
Turn slight left onto Loop Road
25 m · 4 sec · Loop Road
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15
Arrive at your destination
0 m · 1 sec · Loop Road
Car Route Details
A richer read on the saved driving route between Thornton and Merrimack.
Highway-focused drive
Most of the mileage stays on named highways, so the important moments are ramps, exits, merges, and the final local approach.
Styles Bridges Highway
Merge slight left onto Styles Bridges Highway
34.1 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.
Slight Chance Snow Showers then Mostly Cloudy leaving Thornton and Slight Chance Rain Showers near Merrimack.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Thornton to Merrimack?
The road trip is about 79.2 miles (127.5 km) and usually takes 01h 18m 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?
Canterbury is a useful midpoint, sitting about 39.6 miles from Thornton and 39.6 miles from Merrimack.
How much longer is the road route than the straight-line distance?
The direct path is about 71.6 miles (115.2 km), while the road route adds roughly 7.6 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 3:52 PM EDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $11.01 one way or $22.01 round trip. Estimated CO2 is about 24.8 kg one way.
What should you check before leaving?
Before you leave, expect Slight Chance Snow Showers then Mostly Cloudy around Thornton and Slight Chance Rain Showers near Merrimack.
Stop Ideas Near Canterbury
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 Canterbury.
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Flight Path Map
This map shows the direct air route between Thornton and Merrimack. Straight-line distance: 71.6 mi (115.23 km).
#1 Thornton
Town in Grafton County, New Hampshire, United States
| Population | 2,553 |
| Coordinates | 43.8928500, -71.6759100 |
| Altitude | 184 |
| 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: 127 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 02h 38m |
| 40 mph (64.37 km/h) | 01h 58m |
| 50 mph (80.47 km/h) | 01h 35m |
| 60 mph (96.56 km/h) | 01h 19m |
| 70 mph (112.65 km/h) | 01h 07m |
| 80 mph (129 km/h) | 00h 59m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.95 | $11.01 | $22.01 |
| Mid-grade | $4.46 | $12.44 | $24.87 |
| Premium | $4.86 | $13.55 | $27.11 |
| Diesel | $6.00 | $16.73 | $33.46 |
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 · Apr 23, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.