How far is Union, NJ from Mendham, NJ?
The driving distance from Union, NJ to Mendham, NJ is about 22.4 miles (36.1 km), with a travel time of about 00h 35m by car.
- The straight-line flight distance is about 18.5 miles (29.7 km).
- For a round trip, plan for roughly 01h 11m 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 35m.
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.
Borough in Morris County, New Jersey
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 Mendham.
Turn-by-Turn Driving Directions
Step-by-step road directions between Union and Mendham.
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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
2 mi · 5 min · Vauxhall Road
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3
Turn left onto Springfield Avenue
3245 ft · 1 min · Springfield Avenue
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4
Take the ramp straight toward NJ 24 West: Morristown
1875 ft · 1 min
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5
Merge slight left onto Phillipsburg-Newark Expressway
1.5 km · 1 min · Phillipsburg-Newark Expressway
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6
Keep slight right to continue on NJ 24 West: Springfield, Morristown
1798 ft · 34 sec
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7
Continue straight
7.4 mi · 9 min
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8
Take the exit slight right toward CR 510: Florham Park, Morristown
1349 ft · 18 sec
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9
Keep slight left to continue on CR 510 West: Morristown
1458 ft · 19 sec
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10
Keep slight right to continue on CR 510 West: Morristown
1611 ft · 1 min
-
11
Turn straight onto Columbia Turnpike
3012 ft · 55 sec · Columbia Turnpike
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12
Continue on Columbia Road
1.1 mi · 2 min · Columbia Road
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13
Turn left onto Lafayette Avenue
1.1 mi · 2 min · Lafayette Avenue
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14
Turn right onto Morris Street
673 ft · 19 sec · Morris Street
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15
Enter the roundabout and take exit 2 toward Morris Street
56 m · 3 sec · Morris Street
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16
Exit the roundabout onto Morris Street
535 ft · 11 sec · Morris Street
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17
Turn slight right onto East Park Place
69 m · 4 sec · East Park Place
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18
Keep slight left to continue on East Park Place
148 m · 11 sec · East Park Place
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19
Continue on North Park Place
36 m · 6 sec · North Park Place
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20
Turn right onto Washington Street
1.1 km · 2 min · Washington Street
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21
Continue on Mendham Avenue (Old Rt. 24)
1737 ft · 29 sec · Mendham Avenue (Old Rt. 24)
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22
Continue on Washington-Mendham Road E. (Old Rt. 24)
1.6 mi · 2 min · Washington-Mendham Road E. (Old Rt. 24)
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23
Continue on Mendham Road East
3.2 mi · 5 min · Mendham Road East
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24
Continue on Mendham Road (Old Rt. 24)
1.5 km · 1 min · Mendham Road (Old Rt. 24)
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25
Arrive at your destination
0 m · 1 sec · Mendham Road
Car Route Details
A richer read on the saved driving route between Union and Mendham.
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.
NJ 24 West
Continue straight
7.36 mi · 00h 09m
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 Mendham.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Union to Mendham?
The road trip is about 22.4 miles (36.1 km) and usually takes 00h 35m 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?
Florham Park is a useful midpoint, sitting about 11.2 miles from Union and 11.2 miles from Mendham.
How much longer is the road route than the straight-line distance?
The direct path is about 18.5 miles (29.7 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 7:00 AM to 7:00 PM EDT. If you want a more comfortable same-day return, try to leave by 7:18 PM EDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $3.23 one way or $6.46 round trip. Estimated CO2 is about 7 kg one way.
What should you check before leaving?
Before you leave, expect Mostly Sunny around Union and Mostly Sunny near Mendham.
Stop Ideas Near Florham 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 Florham Park.
Newark Liberty International Airport
Pennsylvania Station
Metropark station
New Brunswick station
Flight Path Map
This map shows the direct air route between Union and Mendham. Straight-line distance: 18.48 mi (29.74 km).
#1 Union
A city in Union County, New Jersey.
| Population | 67,137 |
| Coordinates | 40.6976000, -74.2632000 |
| Altitude | 30 |
| Country | United States |
#2 Mendham
Borough in Morris County, New Jersey
| Population | 4,836 |
| Coordinates | 40.7759300, -74.6007100 |
| Altitude | 187 |
| Country | United States |
End: Mendham (-74.60071, 40.77593)
Estimated Travel Time
Distance: 36 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 00h 44m |
| 40 mph (64.37 km/h) | 00h 33m |
| 50 mph (80.47 km/h) | 00h 26m |
| 60 mph (96.56 km/h) | 00h 22m |
| 70 mph (112.65 km/h) | 00h 19m |
| 80 mph (129 km/h) | 00h 16m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $4.09 | $3.23 | $6.46 |
| Mid-grade | $4.60 | $3.63 | $7.27 |
| Premium | $4.95 | $3.91 | $7.83 |
| Diesel | $5.98 | $4.72 | $9.45 |
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.