How far is Watertown, NY from Islip, NY?
The driving distance from Watertown, NY to Islip, NY is about 369.5 miles (594.6 km), with a travel time of about 06h 16m by car.
- The straight-line flight distance is about 263.2 miles (423.5 km).
- For a round trip, plan for roughly 12h 33m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 6:00 AM to 7:30 AM EDT.
Reverse, save, or send this route
This drive is better planned with a longer stop or an overnight stay. Copy the route link, send it to another device, or print a clean version before you head out.
This drive is better planned with a longer stop or an overnight stay.
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 06h 16m.
Starting early still helps, but most travelers will want a longer stop or an overnight stay on a route this long.
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.
Town in Rockland County, New York, United States
Route Weather Snapshot
Check the forecast at both ends before you head out.
Partly Sunny then Chance Rain Showers
Partly Sunny
Driving Route Map
The map below follows the saved road route between Watertown and Islip.
Turn-by-Turn Driving Directions
Step-by-step road directions between Watertown and Islip.
-
1
Start on Public Square
1004 ft · 34 sec · Public Square
-
2
Continue on State Street
1.7 mi · 4 min · State Street
-
3
Turn right onto Gifford Street
2.4 mi · 3 min · Gifford Street
-
4
Continue on Van Allen Road
8.4 mi · 10 min · Van Allen Road
-
5
Continue on State Highway 12
1.4 mi · 2 min · State Highway 12
-
6
Continue on Main Street
3048 ft · 41 sec · Main Street
-
7
Continue on High Street
2991 ft · 39 sec · High Street
-
8
Continue on County Road 14
1772 ft · 23 sec · County Road 14
-
9
Continue on State Highway 12
10.9 mi · 13 min · State Highway 12
-
10
Continue on Dayan Street
2636 ft · 1 min · Dayan Street
-
11
Turn right onto South State Street
3100 ft · 2 min · South State Street
-
12
Continue on Utica Boulevard
2768 ft · 1 min · Utica Boulevard
-
13
Continue on Bea Luck Road
19.8 mi · 23 min · Bea Luck Road
-
14
Continue on State Highway 12
1.2 km · 52 sec · State Highway 12
-
15
Continue on Erwin Parkway
9.7 mi · 11 min · Erwin Parkway
-
16
Continue on State Highway 12
22 mi · 31 min · State Highway 12
-
17
Take the exit slight right
1572 ft · 38 sec
-
18
Merge slight left onto State Route 49
2039 ft · 27 sec · State Route 49
-
19
Continue straight
998 ft · 13 sec
-
20
Take the exit slight right toward Genesee Street South
840 ft · 18 sec
-
21
Keep slight left to continue on I 90
1.2 km · 2 min
-
22
Keep slight right to continue on I 90 East
1766 ft · 43 sec
-
23
Merge slight left onto New York State Thruway
83.7 mi · 1 hr 37 min · New York State Thruway
-
24
Keep slight right to continue on New York State Thruway
118.2 mi · 2 hr 16 min · New York State Thruway
-
25
Keep slight right to continue on I 287 South, NJ 17 South: New Jersey
1.5 km · 60 sec
-
26
Continue straight
2496 ft · 39 sec
-
27
Keep slight left to continue on NJ 17 South: Mahwah
14.1 mi · 19 min
-
28
Take the exit slight right toward NJ 4, GSP South: Paterson, Fort Lee, New York
566 ft · 19 sec
-
29
Keep slight left to continue on NJ 4 East: Fort Lee, New York
2455 ft · 1 min
-
30
Merge slight left
1417 ft · 24 sec
-
31
Continue straight
6.4 mi · 9 min
-
32
Take the exit slight left toward I 95 North: George Washington Bridge
1124 ft · 18 sec
-
33
Merge slight left
1.2 km · 55 sec
-
34
Keep slight left
1.3 km · 1 min
-
35
Continue on George Washington Bridge (upper level)
3174 ft · 1 min · George Washington Bridge (upper level)
-
36
Continue on Trans-Manhattan Expressway
1.2 km · 1 min · Trans-Manhattan Expressway
-
37
Continue on Cross Bronx Expressway
4.7 mi · 6 min · Cross Bronx Expressway
-
38
Keep slight right to continue on Cross Bronx Expressway
2 mi · 3 min · Cross Bronx Expressway
-
39
Merge slight left onto Throgs Neck Expressway
3271 ft · 58 sec · Throgs Neck Expressway
-
40
Continue on Throgs Neck Bridge
2 mi · 3 min · Throgs Neck Bridge
-
41
Continue on Clearview Expressway
5 mi · 5 min · Clearview Expressway
-
42
Continue on Hollis Court Boulevard
1.2 km · 1 min · Hollis Court Boulevard
-
43
At the end of the road, turn left onto Jamaica Avenue
1117 ft · 35 sec · Jamaica Avenue
-
44
Turn right onto Hempstead Avenue
1.4 km · 2 min · Hempstead Avenue
-
45
Turn right onto 225th Street
69 m · 10 sec · 225th Street
-
46
Take the ramp straight toward Cross Island Parkway South, Verrazano Bridge
1171 ft · 29 sec
-
47
Merge slight left onto Cross Island Parkway
1.3 mi · 2 min · Cross Island Parkway
-
48
Take the exit slight left toward Southern State Parkway East, Eastern Long Island
2383 ft · 1 min
-
49
Merge slight left onto Southern State Parkway
24.5 mi · 31 min · Southern State Parkway
-
50
Keep slight left to continue on Southern State Parkway
1072 ft · 16 sec · Southern State Parkway
-
51
Take the exit slight right toward Bay Shore Road South, Bay Shore
1044 ft · 32 sec
-
52
Turn straight onto Bay Shore Road
2667 ft · 1 min · Bay Shore Road
-
53
Continue on Howells Road
1845 ft · 44 sec · Howells Road
-
54
Turn straight onto Sunrise Highway
104 m · 7 sec · Sunrise Highway
-
55
Keep slight right to continue on Howells Road
3115 ft · 2 min · Howells Road
-
56
Continue on Roosevelt Street
1248 ft · 25 sec · Roosevelt Street
-
57
Continue on 3rd Avenue
1 km · 1 min · 3rd Avenue
-
58
At the end of the road, turn left onto East Main Street
1.1 mi · 2 min · East Main Street
-
59
Continue on Montauk Highway
1014 ft · 17 sec · Montauk Highway
-
60
Continue on Main Street
1.2 km · 1 min · Main Street
-
61
Arrive at your destination
0 m · 1 sec · Main Street
Car Route Details
A richer read on the saved driving route between Watertown and Islip.
Long-distance drive
This route is long enough that fuel, rest stops, weather, and timing matter more than any single maneuver.
New York State Thruway
Keep slight right to continue on New York State Thruway
118 mi · 02h 16m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
Better with a longer stop
This route is long enough that most travelers will be better off planning an overnight stay or a more deliberate stop window.
Partly Sunny then Chance Rain Showers leaving Watertown 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 Watertown to Islip?
The road trip is about 369.5 miles (594.6 km) and usually takes 06h 16m in normal driving conditions.
Is this a same-day trip or an overnight route?
This route is long enough that most travelers will be better off planning an overnight stay or a more deliberate stop window.
What is the halfway point on this route?
Stony Point is a useful midpoint, sitting about 178.6 miles from Watertown and 190.8 miles from Islip.
How much longer is the road route than the straight-line distance?
The direct path is about 263.2 miles (423.5 km), while the road route adds roughly 106.3 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 6:00 AM to 7:30 AM EDT. Starting early still helps, but most travelers will want a longer stop or an overnight stay on a route this long.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $52.28 one way or $104.55 round trip. Estimated CO2 is about 115.9 kg one way.
What should you check before leaving?
Before you leave, expect Partly Sunny then Chance Rain Showers around Watertown and Partly Sunny near Islip.
Stop Ideas Near Stony Point
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 Stony Point.
Albany–Rensselaer
Hudson
Schenectady
Joseph Scelsi Intermodal Transportation Center
Flight Path Map
This map shows the direct air route between Watertown and Islip. Straight-line distance: 263.18 mi (423.54 km).
#1 Watertown
Town in Jefferson County, New York
| Population | 4,426 |
| Coordinates | 43.9747800, -75.9107600 |
| Altitude | 142 |
| 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: Main Street (-73.210382, 40.729789)
Estimated Travel Time
Distance: 595 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 12h 18m |
| 40 mph (64.37 km/h) | 09h 14m |
| 50 mph (80.47 km/h) | 07h 23m |
| 60 mph (96.56 km/h) | 06h 09m |
| 70 mph (112.65 km/h) | 05h 16m |
| 80 mph (129 km/h) | 04h 36m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $4.01 | $52.28 | $104.55 |
| Mid-grade | $4.48 | $58.43 | $116.86 |
| Premium | $4.86 | $63.39 | $126.77 |
| Diesel | $4.69 | $61.21 | $122.42 |
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.