How far is Union, NJ from South River, NJ?
The driving distance from Union, NJ to South River, NJ is about 23.1 miles (37.1 km), with a travel time of about 00h 37m by car.
- The straight-line flight distance is about 18.5 miles (29.8 km).
- For a round trip, plan for roughly 01h 15m 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 37m.
This is a short drive, so your comfort window is wide. Traffic and current weather matter more than the clock.
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.
Township in Middlesex County, New Jersey, United States
Route Weather Snapshot
Check the forecast at both ends before you head out.
Mostly Sunny
Mostly Sunny
Driving Route Map
The map below follows the saved road route between Union and South River.
Turn-by-Turn Driving Directions
Step-by-step road directions between Union and South River.
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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
1087 ft · 42 sec · Vauxhall Road
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3
Turn left onto Stuyvesant Avenue
3120 ft · 2 min · Stuyvesant Avenue
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4
Continue on Chestnut Street
708 ft · 28 sec · Chestnut Street
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5
Take the ramp slight right toward GSP Toll South
1588 ft · 39 sec
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6
Merge slight left onto Garden State Parkway
8.6 mi · 12 min · Garden State Parkway
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7
Continue on Garden State Parkway Southbound
1.3 mi · 2 min · Garden State Parkway Southbound
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8
Take the exit slight right toward US 1: Newark, Trenton
1110 ft · 27 sec
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9
Keep slight right to continue on US 1 South: Trenton
1453 ft · 35 sec
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10
Merge slight left
636 ft · 13 sec
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11
Continue straight
2.1 mi · 3 min
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12
Continue straight
4.7 mi · 7 min
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13
Take the exit straight toward NJ 18: New Brunswick, East Brunswick
643 ft · 18 sec
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14
Keep slight left to continue on NJ 18 South: East Brunswick, Old Bridge
724 ft · 21 sec
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15
Merge slight right onto State Route 18
3.3 mi · 6 min · State Route 18
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16
Take the exit slight right
152 m · 14 sec
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17
Take the ramp right
1113 ft · 31 sec
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18
Keep slight left
1087 ft · 35 sec
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19
Turn left onto Main Street
2013 ft · 34 sec · Main Street
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20
Arrive at your destination
0 m · 1 sec · Main Street
Car Route Details
A richer read on the saved driving route between Union and South River.
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.
Garden State Parkway
Merge slight left onto Garden State Parkway
8.63 mi · 00h 12m
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.
Mostly Sunny leaving Union and Mostly Sunny near South River.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Union to South River?
The road trip is about 23.1 miles (37.1 km) and usually takes 00h 37m 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?
Menlo Park is a useful midpoint, sitting about 11.5 miles from Union and 11.5 miles from South River.
How much longer is the road route than the straight-line distance?
The direct path is about 18.5 miles (29.8 km), while the road route adds roughly 4.6 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 7:00 AM to 7:00 PM EDT. If you want a more comfortable same-day return, try to leave by 7:14 PM EDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $3.31 one way or $6.62 round trip. Estimated CO2 is about 7.2 kg one way.
What should you check before leaving?
Before you leave, expect Mostly Sunny around Union and Mostly Sunny near South River.
Stop Ideas Near Menlo Park
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 Menlo Park.
Metropark station
New Brunswick station
Newark Liberty International Airport
Pennsylvania Station
Flight Path Map
This map shows the direct air route between Union and South River. Straight-line distance: 18.51 mi (29.79 km).
#1 Union
A city in Union County, New Jersey.
| Population | 67,137 |
| Coordinates | 40.6976000, -74.2632000 |
| Altitude | 30 |
| Country | United States |
#2 South River
Borough in Middlesex County, New Jersey
| Population | 15,624 |
| Coordinates | 40.4464900, -74.3859800 |
| Altitude | 25 |
| Country | United States |
End: South River (-74.38598, 40.44649)
Estimated Travel Time
Distance: 37 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 00h 46m |
| 40 mph (64.37 km/h) | 00h 34m |
| 50 mph (80.47 km/h) | 00h 27m |
| 60 mph (96.56 km/h) | 00h 23m |
| 70 mph (112.65 km/h) | 00h 19m |
| 80 mph (129 km/h) | 00h 17m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $4.09 | $3.31 | $6.62 |
| Mid-grade | $4.60 | $3.73 | $7.45 |
| Premium | $4.95 | $4.01 | $8.03 |
| Diesel | $5.98 | $4.84 | $9.69 |
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.