How far is Fort Montgomery, NY from Islip, NY?
The driving distance from Fort Montgomery, NY to Islip, NY is about 87.6 miles (141 km), with a travel time of about 01h 58m by car.
- The straight-line flight distance is about 58 miles (93.4 km).
- For a round trip, plan for roughly 03h 57m 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 58m.
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.
The fourth most populous borough of New York City.
Route Weather Snapshot
Check the forecast at both ends before you head out.
Mostly Sunny
Partly Sunny
Driving Route Map
The map below follows the saved road route between Fort Montgomery and Islip.
Turn-by-Turn Driving Directions
Step-by-step road directions between Fort Montgomery and Islip.
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1
Start on United States Route 9W
1.1 km · 60 sec · United States Route 9W
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2
Take the exit slight right
1128 ft · 19 sec
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3
Merge slight left onto Palisades Interstate Parkway
2.3 mi · 3 min · Palisades Interstate Parkway
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4
Keep slight left to continue on Palisades Interstate Parkway
35.1 mi · 45 min · Palisades Interstate Parkway
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5
Merge slight left
2776 ft · 53 sec
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6
Continue on George Washington Bridge (upper level)
3174 ft · 1 min · George Washington Bridge (upper level)
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7
Continue on Trans-Manhattan Expressway
1.2 km · 1 min · Trans-Manhattan Expressway
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8
Continue on Cross Bronx Expressway
4.7 mi · 6 min · Cross Bronx Expressway
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9
Keep slight right to continue on Cross Bronx Expressway
2 mi · 3 min · Cross Bronx Expressway
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10
Merge slight left onto Throgs Neck Expressway
3271 ft · 58 sec · Throgs Neck Expressway
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11
Continue on Throgs Neck Bridge
2 mi · 3 min · Throgs Neck Bridge
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12
Continue on Clearview Expressway
5 mi · 5 min · Clearview Expressway
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13
Continue on Hollis Court Boulevard
1.2 km · 1 min · Hollis Court Boulevard
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14
At the end of the road, turn left onto Jamaica Avenue
1117 ft · 35 sec · Jamaica Avenue
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15
Turn right onto Hempstead Avenue
1.4 km · 2 min · Hempstead Avenue
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16
Turn right onto 225th Street
69 m · 10 sec · 225th Street
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17
Take the ramp straight toward Cross Island Parkway South, Verrazano Bridge
1171 ft · 29 sec
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18
Merge slight left onto Cross Island Parkway
1.3 mi · 2 min · Cross Island Parkway
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19
Take the exit slight left toward Southern State Parkway East, Eastern Long Island
2383 ft · 1 min
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20
Merge slight left onto Southern State Parkway
24.5 mi · 31 min · Southern State Parkway
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21
Keep slight left to continue on Southern State Parkway
1072 ft · 16 sec · Southern State Parkway
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22
Take the exit slight right toward Bay Shore Road South, Bay Shore
1044 ft · 32 sec
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23
Turn straight onto Bay Shore Road
2667 ft · 1 min · Bay Shore Road
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24
Continue on Howells Road
1845 ft · 44 sec · Howells Road
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25
Turn straight onto Sunrise Highway
104 m · 7 sec · Sunrise Highway
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26
Keep slight right to continue on Howells Road
3115 ft · 2 min · Howells Road
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27
Continue on Roosevelt Street
1248 ft · 25 sec · Roosevelt Street
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28
Continue on 3rd Avenue
1 km · 1 min · 3rd Avenue
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29
At the end of the road, turn left onto East Main Street
1.1 mi · 2 min · East Main Street
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30
Continue on Montauk Highway
1014 ft · 17 sec · Montauk Highway
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31
Continue on Main Street
1.2 km · 1 min · Main Street
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32
Arrive at your destination
0 m · 1 sec · Main Street
Car Route Details
A richer read on the saved driving route between Fort Montgomery and Islip.
Highway-focused drive
Most of the mileage stays on named highways, so the important moments are ramps, exits, merges, and the final local approach.
Palisades Interstate Parkway
Keep slight left to continue on Palisades Interstate Parkway
35.1 mi · 00h 45m
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 Fort Montgomery and Partly Sunny near Islip.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Fort Montgomery to Islip?
The road trip is about 87.6 miles (141 km) and usually takes 01h 58m 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?
The Bronx is a useful midpoint, sitting about 43.8 miles from Fort Montgomery and 43.9 miles from Islip.
How much longer is the road route than the straight-line distance?
The direct path is about 58 miles (93.4 km), while the road route adds roughly 29.6 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 2:32 PM EDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $12.39 one way or $24.78 round trip. Estimated CO2 is about 27.5 kg one way.
What should you check before leaving?
Before you leave, expect Mostly Sunny around Fort Montgomery and Partly Sunny near Islip.
Stop Ideas Near The Bronx
Useful break, food, and waypoint ideas within about 15 miles of the route midpoint.
Radio City Music Hall
The Yard: City Hall Park NYC
CITY HALL LOBBY
Diamond City Hall Photography
Transit and Meeting Points
Useful pickup, handoff, or rendezvous points close to The Bronx.
Yonkers station
New Rochelle station
Pennsylvania Station
Pennsylvania Station
Flight Path Map
This map shows the direct air route between Fort Montgomery and Islip. Straight-line distance: 58.02 mi (93.37 km).
#1 Fort Montgomery
Census-designated place in Orange County, New York
| Population | 1,571 |
| Coordinates | 41.3314800, -73.9868100 |
| Altitude | 49 |
| Country | United States |
#2 Islip
This Long Island community is situated on the south shore of Suffolk County, New York, at an elevation of 13 feet.
| Population | 322,328 |
| Coordinates | 40.7298200, -73.2103900 |
| Altitude | 4 |
| Country | United States |
End: Islip (-73.21039, 40.72982)
Estimated Travel Time
Distance: 141 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 02h 55m |
| 40 mph (64.37 km/h) | 02h 11m |
| 50 mph (80.47 km/h) | 01h 45m |
| 60 mph (96.56 km/h) | 01h 27m |
| 70 mph (112.65 km/h) | 01h 15m |
| 80 mph (129 km/h) | 01h 05m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $4.01 | $12.39 | $24.78 |
| Mid-grade | $4.48 | $13.85 | $27.69 |
| Premium | $4.86 | $15.02 | $30.04 |
| Diesel | $4.69 | $14.50 | $29.01 |
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 York · Apr 19, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.