How far is Mount Sinai, NY from Islip, NY?
The driving distance from Mount Sinai, NY to Islip, NY is about 20.3 miles (32.7 km), with a travel time of about 00h 33m by car.
- The straight-line flight distance is about 17.7 miles (28.5 km).
- For a round trip, plan for roughly 01h 07m 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 33m.
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.
Census-designated place in Suffolk County, New York
Route Weather Snapshot
Check the forecast at both ends before you head out.
Partly Sunny
Partly Sunny
Driving Route Map
The map below follows the saved road route between Mount Sinai and Islip.
Turn-by-Turn Driving Directions
Step-by-step road directions between Mount Sinai and Islip.
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1
Start on Shore Road
1.1 km · 2 min · Shore Road
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2
Turn right onto North Country Road
948 ft · 24 sec · North Country Road
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3
Turn left onto Crystal Brook Hollow Road
2458 ft · 54 sec · Crystal Brook Hollow Road
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4
Turn right onto Nesconset Highway
6.7 mi · 10 min · Nesconset Highway
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5
Continue on Smithtown Bypass
4.5 mi · 7 min · Smithtown Bypass
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6
Take the exit straight toward Route 111, Islip, Smithtown
116 m · 17 sec
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7
Turn left onto Hauppauge Boulevard
2424 ft · 46 sec · Hauppauge Boulevard
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8
At the end of the road, turn right onto Townline Road
128 m · 9 sec · Townline Road
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9
Keep slight left to continue on Wheeler Road
1.6 mi · 3 min · Wheeler Road
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10
Keep slight right to continue on Joshuas Path
1.5 mi · 2 min · Joshuas Path
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11
Continue on Islip Avenue
4 mi · 7 min · Islip Avenue
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12
At the end of the road, turn right onto Main Street
865 ft · 15 sec · Main Street
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13
Arrive at your destination
0 m · 1 sec · Main Street
Car Route Details
A richer read on the saved driving route between Mount Sinai and Islip.
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.
Nesconset Highway
Turn right onto Nesconset Highway
6.66 mi · 00h 10m
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.
Partly Sunny leaving Mount Sinai 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 Mount Sinai to Islip?
The road trip is about 20.3 miles (32.7 km) and usually takes 00h 33m 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?
Nesconset is a useful midpoint, sitting about 10.2 miles from Mount Sinai and 10.2 miles from Islip.
How much longer is the road route than the straight-line distance?
The direct path is about 17.7 miles (28.5 km), while the road route adds roughly 2.6 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 7:22 PM EDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $2.89 one way or $5.77 round trip. Estimated CO2 is about 6.4 kg one way.
What should you check before leaving?
Before you leave, expect Partly Sunny around Mount Sinai and Partly Sunny near Islip.
Stop Ideas Near Nesconset
Useful break, food, and waypoint ideas within about 15 miles of the route midpoint.
Town of Babylon History Museum at Old Town Hall
Brookhaven Town Hall
Transit and Meeting Points
Useful pickup, handoff, or rendezvous points close to Nesconset.
Bridgeport
Stamford Transportation Center
New Rochelle station
Union Station
Flight Path Map
This map shows the direct air route between Mount Sinai and Islip. Straight-line distance: 17.74 mi (28.55 km).
#1 Mount Sinai
Hamlet located within the Town of Brookhaven in Suffolk County, New York
| Population | 12,118 |
| Coordinates | 40.9470400, -73.0295500 |
| Altitude | 10 |
| 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: 33 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 00h 40m |
| 40 mph (64.37 km/h) | 00h 30m |
| 50 mph (80.47 km/h) | 00h 24m |
| 60 mph (96.56 km/h) | 00h 20m |
| 70 mph (112.65 km/h) | 00h 17m |
| 80 mph (129 km/h) | 00h 15m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $4.01 | $2.89 | $5.77 |
| Mid-grade | $4.48 | $3.23 | $6.45 |
| Premium | $4.86 | $3.50 | $7.00 |
| Diesel | $4.69 | $3.38 | $6.76 |
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.