How far is Islip, NY from Knox, NY?
The driving distance from Islip, NY to Knox, NY is about 192.6 miles (309.9 km), with a travel time of about 04h 23m by car.
- The straight-line flight distance is about 142 miles (228.6 km).
- For a round trip, plan for roughly 08h 46m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 6:00 AM to 8:00 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 04h 23m.
An early departure helps you fit a real stop into the day without turning the return into a late-night drive.
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.
Census-designated place in Orange County, New York
Route Weather Snapshot
Check the forecast at both ends before you head out.
Chance Rain Showers
Chance Rain Showers
Driving Route Map
The map below follows the saved road route between Islip and Knox.
Turn-by-Turn Driving Directions
Step-by-step road directions between Islip and Knox.
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1
Start on Main Street
1.2 km · 1 min · Main Street
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2
Continue on Montauk Highway
1014 ft · 19 sec · Montauk Highway
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3
Continue on Main Street
1.1 mi · 2 min · Main Street
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4
Turn right onto 3rd Avenue
2920 ft · 1 min · 3rd Avenue
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5
Continue on Rossevelt Street
1821 ft · 37 sec · Rossevelt Street
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6
Continue on Howells Road
1.1 km · 2 min · Howells Road
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7
Turn straight onto Sunrise Highway
50 m · 3 sec · Sunrise Highway
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8
Keep slight right to continue on Howells Road
1588 ft · 36 sec · Howells Road
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9
Continue on Bay Shore Road
3165 ft · 1 min · Bay Shore Road
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10
Take the ramp slight right toward SO West: New York
736 ft · 19 sec
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11
Continue straight
111 m · 9 sec
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12
Merge slight left onto Southern State Parkway
24.7 mi · 32 min · Southern State Parkway
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13
Take the exit slight right toward Cross Island Parkway North, Whitestone Bridge
1780 ft · 43 sec
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14
Merge slight left onto Cross Island Parkway
1.3 mi · 2 min · Cross Island Parkway
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15
Take the exit slight right toward NY 24: UBS Arena-Belmont Park
97 m · 9 sec
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16
Keep slight left to continue on NY 24 West: Hempstead Avenue
133 m · 12 sec
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17
Keep slight right to continue on Cross Island Parkway North, Hempstead Avenue West
532 ft · 15 sec
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18
Keep slight right to continue on Hempstead Avenue West
81 m · 8 sec
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19
Continue on Grandstand, Hempstead Avenue West
549 ft · 14 sec
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20
Keep slight left to continue on Hempstead Avenue
31 m · 5 sec
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21
Turn right onto Hempstead Avenue
1.6 km · 2 min · Hempstead Avenue
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22
Turn left onto Jamaica Avenue
553 ft · 17 sec · Jamaica Avenue
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23
Turn right onto 212th Street
1.2 km · 1 min · 212th Street
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24
Continue on Clearview Expressway
5 mi · 5 min · Clearview Expressway
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25
Continue on Throgs Neck Bridge
2 mi · 3 min · Throgs Neck Bridge
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26
Continue on Throgs Neck Expressway
1.1 km · 1 min · Throgs Neck Expressway
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27
Keep slight left to continue on Cross Bronx Expressway
6.6 mi · 9 min · Cross Bronx Expressway
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28
Keep slight left to continue on Trans-Manhattan Expressway
1.1 km · 1 min · Trans-Manhattan Expressway
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29
Continue on George Washington Bridge (upper level)
3167 ft · 60 sec · George Washington Bridge (upper level)
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30
Continue straight
2659 ft · 48 sec
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31
Keep slight left
3214 ft · 39 sec
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32
Keep slight left
559 ft · 9 sec
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33
Take the exit slight right toward I 95 South, NJTP South: Hackensack
1270 ft · 23 sec
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34
Keep slight right to continue on NJ 4 West: Paramus
970 ft · 24 sec
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35
Merge slight right
6.7 mi · 9 min
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36
Take the exit straight toward GSP South, NJ 17 South, GSP North, NJ 17 North: Grand State Plaza, Newark, Mahwah
951 ft · 26 sec
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37
Keep slight right to continue on NJ 17 North: Mahwah
1302 ft · 37 sec
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38
Merge slight left
3.3 mi · 4 min
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39
Continue straight
7.3 mi · 10 min
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40
Continue straight
1.2 km · 50 sec
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41
Continue straight
3.3 mi · 4 min
-
42
Continue straight
877 ft · 11 sec
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43
Keep slight left to continue on I 87 North, NY 17 North, New York State Thruway North: Albany
71 mi · 1 hr 22 min
-
44
Take the exit slight right toward NY 32: Saugerties
2031 ft · 1 min
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45
Turn left
974 ft · 24 sec
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46
Turn straight
6 mi · 8 min
-
47
Continue on King's Highway
1 mi · 1 min · King's Highway
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48
Continue on State Highway 32
9.2 mi · 14 min · State Highway 32
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49
At the end of the road, turn left onto State Highway 23
1.1 mi · 2 min · State Highway 23
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50
Turn right onto State Highway 32
10.7 mi · 16 min · State Highway 32
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51
Turn left onto County Route 405
1.2 km · 2 min · County Route 405
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52
Turn right onto County Route 401
5.2 mi · 10 min · County Route 401
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53
At the end of the road, turn left
57 m · 5 sec
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54
Turn right onto New York State Highway 143
2.7 mi · 5 min · New York State Highway 143
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55
Turn right onto Delaware Turnpike
3.6 mi · 5 min · Delaware Turnpike
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56
Turn left onto Helderberg Trail
3.5 mi · 5 min · Helderberg Trail
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57
Turn right onto Thacher Park Road
2031 ft · 34 sec · Thacher Park Road
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58
Turn left onto Warners Lake Road
1.4 km · 2 min · Warners Lake Road
-
59
Turn straight onto Knox Cave Road
3.6 mi · 9 min · Knox Cave Road
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60
Arrive at your destination
0 m · 1 sec · Knox Cave Road
Car Route Details
A richer read on the saved driving route between Islip and Knox.
Highway-focused drive
Most of the mileage stays on named highways, so the important moments are ramps, exits, merges, and the final local approach.
I 87 North
Keep slight left to continue on I 87 North, NY 17 North, New York State Thruway North: Albany
71 mi · 01h 22m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A longer out-and-back drive
This is still possible in one day, but it becomes a long driving day. Leaving early and planning your stop window matters more here.
Chance Rain Showers leaving Islip and Chance Rain Showers near Knox.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Islip to Knox?
The road trip is about 192.6 miles (309.9 km) and usually takes 04h 23m in normal driving conditions.
Is this a same-day trip or an overnight route?
This is still possible in one day, but it becomes a long driving day. Leaving early and planning your stop window matters more here.
What is the halfway point on this route?
Firthcliffe is a useful midpoint, sitting about 96.3 miles from Islip and 96.3 miles from Knox.
How much longer is the road route than the straight-line distance?
The direct path is about 142 miles (228.6 km), while the road route adds roughly 50.6 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 6:00 AM to 8:00 AM EDT. If you want a more comfortable same-day return, try to leave by 8:14 AM EDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $27.22 one way or $54.44 round trip. Estimated CO2 is about 60.3 kg one way.
What should you check before leaving?
Before you leave, expect Chance Rain Showers around Islip and Chance Rain Showers near Knox.
Stop Ideas Near Firthcliffe
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 Firthcliffe.
Croton–Harmon station
Poughkeepsie station
Rhinecliff–Kingston station
Yonkers station
Flight Path Map
This map shows the direct air route between Islip and Knox. Straight-line distance: 142.03 mi (228.58 km).
#1 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 |
#2 Knox
Town in Albany County, New York, United States
| Population | 2,655 |
| Coordinates | 42.6711900, -74.1156800 |
| Altitude | 376 |
| Country | United States |
End: Knox (-74.11568, 42.67119)
Estimated Travel Time
Distance: 310 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 06h 24m |
| 40 mph (64.37 km/h) | 04h 48m |
| 50 mph (80.47 km/h) | 03h 51m |
| 60 mph (96.56 km/h) | 03h 12m |
| 70 mph (112.65 km/h) | 02h 45m |
| 80 mph (129 km/h) | 02h 24m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $4.01 | $27.22 | $54.44 |
| Mid-grade | $4.48 | $30.43 | $60.85 |
| Premium | $4.86 | $33.01 | $66.01 |
| Diesel | $4.69 | $31.87 | $63.74 |
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 18, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.