How far is Union, NJ from Hillsborough, NJ?
The driving distance from Union, NJ to Hillsborough, NJ is about 28.3 miles (45.5 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 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 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.
Mostly Sunny
Sunny
Driving Route Map
The map below follows the saved road route between Union and Hillsborough.
Turn-by-Turn Driving Directions
Step-by-step road directions between Union and Hillsborough.
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1
Start on Harding Avenue
74 m · 12 sec · Harding Avenue
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2
Turn right onto Vauxhall Road
86 m · 16 sec · Vauxhall Road
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3
Turn left onto Adams Avenue
617 ft · 29 sec · Adams Avenue
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4
Turn right onto Morris Avenue
560 ft · 23 sec · Morris Avenue
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5
Turn left onto Burke Parkway
150 m · 24 sec · Burke Parkway
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6
Keep slight left to continue on Burke Parkway
137 m · 20 sec · Burke Parkway
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7
Turn right onto Legion Drive
94 m · 21 sec · Legion Drive
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8
At the end of the road, turn left onto Rosemont Avenue North
100 m · 15 sec · Rosemont Avenue North
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9
Take the ramp right
44 m · 6 sec
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10
Merge slight left
18.9 mi · 29 min
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11
Take the exit slight right toward Foothill Road, Finderne Avenue, Manville
134 m · 14 sec
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12
Turn slight right
45 m · 5 sec
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13
Turn slight right onto Foothill Road
2218 ft · 1 min · Foothill Road
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14
Turn right onto Finderne Avenue
1.5 mi · 3 min · Finderne Avenue
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15
Continue on North Main Street
1.3 mi · 3 min · North Main Street
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16
Continue on South Main Street
2720 ft · 60 sec · South Main Street
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17
Continue on Millstone River Road
1.4 mi · 2 min · Millstone River Road
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18
Turn straight onto Somerset Courthouse Road
2379 ft · 54 sec · Somerset Courthouse Road
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19
At the end of the road, turn right onto Millstone Bypass
3022 ft · 1 min · Millstone Bypass
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20
Continue on Amwell Road
1 mi · 2 min · Amwell Road
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21
Turn left onto Willow Road
1.4 mi · 3 min · Willow Road
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22
Arrive at your destination
0 m · 1 sec · Willow Road
Car Route Details
A richer read on the saved driving route between Union and Hillsborough.
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.
Rosemont Avenue North
Merge slight left
18.9 mi · 00h 29m
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 Union and Sunny near Hillsborough.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Union to Hillsborough?
The road trip is about 28.3 miles (45.5 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 14.1 miles from Union and 14.2 miles from Hillsborough.
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 3.9 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 4:52 PM EDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $4.09 one way or $8.17 round trip. Estimated CO2 is about 8.9 kg one way.
What should you check before leaving?
Before you leave, expect Mostly Sunny around Union and Sunny near Hillsborough.
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 Union and Hillsborough. Straight-line distance: 24.4 mi (39.26 km).
#1 Union
A city in Union County, New Jersey.
| Population | 67,137 |
| Coordinates | 40.6976000, -74.2632000 |
| Altitude | 30 |
| Country | United States |
#2 Hillsborough
Township in Somerset county, New Jersey
| Population | 40,105 |
| Coordinates | 40.4776000, -74.6268200 |
| Altitude | 26 |
| Country | United States |
End: Hillsborough (-74.62682, 40.4776)
Estimated Travel Time
Distance: 46 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 00h 56m |
| 40 mph (64.37 km/h) | 00h 42m |
| 50 mph (80.47 km/h) | 00h 33m |
| 60 mph (96.56 km/h) | 00h 28m |
| 70 mph (112.65 km/h) | 00h 24m |
| 80 mph (129 km/h) | 00h 21m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $4.09 | $4.09 | $8.17 |
| Mid-grade | $4.60 | $4.60 | $9.20 |
| Premium | $4.95 | $4.95 | $9.91 |
| Diesel | $5.98 | $5.98 | $11.96 |
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 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.