How far is Hillsborough, NJ from Union, NJ?
The driving distance from Hillsborough, NJ to Union, NJ is about 37.9 miles (61 km), with a travel time of about 00h 48m by car.
- The straight-line flight distance is about 24.4 miles (39.3 km).
- For a round trip, plan for roughly 01h 36m 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 48m.
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.
Borough in Middlesex County, New Jersey
Route Weather Snapshot
Check the forecast at both ends before you head out.
Chance Rain Showers
Chance Rain Showers
Driving Route Map
The map below follows the saved road route between Hillsborough and Union.
Turn-by-Turn Driving Directions
Step-by-step road directions between Hillsborough and Union.
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1
Start on Willow Road
1.4 mi · 3 min · Willow Road
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2
Turn right onto Amwell Road
1 mi · 2 min · Amwell Road
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3
Continue on Millstone Bypass
3022 ft · 1 min · Millstone Bypass
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4
Turn left onto Somerset Courthouse Road
2379 ft · 50 sec · Somerset Courthouse Road
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5
Continue on Millstone River Road
1.4 mi · 2 min · Millstone River Road
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6
Continue on South Main Street
1.8 mi · 4 min · South Main Street
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7
Continue on Finderne Avenue
1.6 mi · 3 min · Finderne Avenue
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8
Merge slight left
1.5 mi · 2 min
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9
Continue straight
2 mi · 3 min
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10
Continue straight
8.6 mi · 13 min
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11
Continue straight
5.4 mi · 9 min
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12
Continue straight
3162 ft · 60 sec
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13
Take the exit slight right toward Fairway Drive South
68 m · 16 sec
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14
Turn straight onto Fairway Drive East
1915 ft · 1 min · Fairway Drive East
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15
At the end of the road, turn left onto Chestnut Street
88 m · 19 sec · Chestnut Street
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16
Keep slight right to continue on Stuyvesant Avenue
3231 ft · 2 min · Stuyvesant Avenue
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17
Turn right onto Vauxhall Road
1087 ft · 41 sec · Vauxhall Road
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18
Turn left onto Harding Avenue
74 m · 11 sec · Harding Avenue
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19
Arrive at your destination
0 m · 1 sec · Harding Avenue
Car Route Details
A richer read on the saved driving route between Hillsborough and Union.
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.
Finderne Avenue
Continue straight
8.63 mi · 00h 13m
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.
Chance Rain Showers leaving Hillsborough and Chance Rain Showers near Union.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Hillsborough to Union?
The road trip is about 37.9 miles (61 km) and usually takes 00h 48m 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?
Dunellen is a useful midpoint, sitting about 13.9 miles from Hillsborough and 24 miles from Union.
How much longer is the road route than the straight-line distance?
The direct path is about 24.4 miles (39.3 km), while the road route adds roughly 13.5 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 4:54 PM EDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $5.48 one way or $10.95 round trip. Estimated CO2 is about 11.9 kg one way.
What should you check before leaving?
Before you leave, expect Chance Rain Showers around Hillsborough and Chance Rain Showers near Union.
Stop Ideas Near Dunellen
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 Dunellen.
New Brunswick station
Metropark station
Newark Liberty International Airport
Pennsylvania Station
Flight Path Map
This map shows the direct air route between Hillsborough and Union. Straight-line distance: 24.4 mi (39.26 km).
#1 Hillsborough
Township in Somerset county, New Jersey
| Population | 40,105 |
| Coordinates | 40.4776000, -74.6268200 |
| Altitude | 26 |
| Country | United States |
#2 Union
A city in Union County, New Jersey.
| Population | 67,137 |
| Coordinates | 40.6976000, -74.2632000 |
| Altitude | 30 |
| Country | United States |
End: Harding Avenue (-74.26348, 40.697581)
Estimated Travel Time
Distance: 61 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 01h 15m |
| 40 mph (64.37 km/h) | 00h 56m |
| 50 mph (80.47 km/h) | 00h 45m |
| 60 mph (96.56 km/h) | 00h 37m |
| 70 mph (112.65 km/h) | 00h 32m |
| 80 mph (129 km/h) | 00h 28m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $4.09 | $5.48 | $10.95 |
| Mid-grade | $4.60 | $6.16 | $12.33 |
| Premium | $4.95 | $6.64 | $13.28 |
| Diesel | $5.98 | $8.01 | $16.03 |
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 Jersey · 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.