Origin
Mount Sinai, NY
Afternoon in Mount Sinai on Friday
Local time
3:37 PM
EDT
Current temp
54°F
Unavailable
Live forecast
Trip from Mount Sinai, NY to Islip, NY
Compiled and reviewed by the Trip.ovh planning team at COD Solutions Oy · Last reviewed Apr 17, 2026 · Editorial standards
Drive Time
33m
Distance
20.3 mi
33 km
Drive Score
6/10
Good drive
Same Day?
Yes, doable
Fuel Cost
$3
one way
EV Charging
Unknown
Best Time to Leave
4 AM
0h 31m
★
6 AM
0h 34m
8 AM
0h 39m
10 AM
0h 36m
12 PM
0h 35m
3 PM
0h 36m
5 PM
0h 39m
8 PM
0h 32m
Estimated drive times based on typical traffic patterns. Actual times may vary with weather, construction, and real-time conditions.
Mount Sinai, NY
Wikimedia Commons
Islip, NY
Wikimedia Commons
Trip Overview
The drive from Mount Sinai, NY to Islip, NY covers 20.3 miles and takes about 33m behind the wheel. This route is realistic as a one-day drive if you keep your stops efficient.
The route leans on Nesconset Highway, Smithtown Bypass, Islip Avenue for much of the mileage, and the overall profile is turn-heavy local drive. The longest uninterrupted segment is about 6.7 miles on Nesconset Highway. At current regular gas prices, budget about $3.34 one way before food or hotel costs.
Who Is This Route For?
Weekend Trip
Doable as a same-day drive at 33m. Total distance: 20.3 miles.
Family Friendly
Moderate complexity with 0 natural rest stops along the way.
Solo Traveler
33m drive, comfortable solo distance.
EV Driver
0 DC fast chargers along the route. Coverage: unknown.
Scenic Drive
Turn-heavy local drive route profile with national parks nearby.
Drive Character
Expect a 33m drive with frequent turns across 20.3 miles of local and secondary roads.
This route has more turning and local-road decision points than a simple highway run.
There are about 13 navigation steps in the underlying route data, so the final approach matters more than the middle miles.
Nesconset Highway is the longest continuous segment at about 6.7 miles.
How Hard Is This Drive?
Expect a hands-on drive with frequent turns and local roads rather than long highway stretches. This route has several spots where lane changes, forks, or exits need your full attention. The trickiest moment comes around 1.3 miles in near NY 347 / Nesconset Highway.
Driving Effort
7/10
Focused - busy navigation packed into a short drive
Balances navigation complexity with total wheel time.
This is a short but busy drive. With 9 decision points packed into just 20.3 miles, you will need to pay attention to lane changes and exits — but the whole thing is over in 33m.
Where does it get tricky?
The main spots that need attention: at 1.3 miles (NY 347 / Nesconset Highway): Lane positioning matters here; at 12.4 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one; at 12.5 miles (NY 111 / Hauppauge Boulevard): Navigation decision point.
Critical Maneuvers
5 of 9 key pointsThese are the spots where you need to pay the most attention. Preview them before you drive.
5
1.3 mi into trip
|
~2m in
|
NY 347 / Nesconset Highway
Turn right onto NY 347 / Nesconset Highway
Lane positioning matters here
Use the right lane.
7
12.4 mi into trip
|
~20m in
Take the exit toward Route 111, Islip, Smithtown
Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one
Use the right lane.
Toward Route 111, Islip, Smithtown
4
12.5 mi into trip
|
~20m in
|
NY 111 / Hauppauge Boulevard
Turn left onto NY 111 / Hauppauge Boulevard
Navigation decision point
6
13 mi into trip
|
~21m in
|
NY 111 / Wheeler Road
Keep slight left at fork onto NY 111 / Wheeler Road
Highway fork - watch signs carefully. Lane positioning matters here
Use the straight lane.
6
20.2 mi into trip
|
~33m in
|
NY 27A / Main Street
At end of road, turn right onto NY 27A / Main Street
Lane positioning matters here
Use the right lane.
Towns Mentioned on Route Signs
Based on OSRM destination-sign hints, not a full list of every settlement the road passes.
On the drive from Mount Sinai, NY to Islip, NY, road signs begin pointing toward Smithtown along the way.
Smithtown
12.4 mi in
|
~20m
Main Roads
| Road | Distance | Duration |
|---|---|---|
| Nesconset Highway | 6.7 mi | 10m |
| Smithtown Bypass | 4.5 mi | 7m |
| Islip Avenue | 4 mi | 7m |
| Wheeler Road | 1.6 mi | 2m |
| Joshuas Path | 1.5 mi | 2m |
| Shore Road | 0.7 mi | 1m |
| Crystal Brook Hollow Road | 0.5 mi | <1m |
| Hauppauge Boulevard | 0.5 mi | <1m |
Longest stretch:
Nesconset Highway
— 6.7 mi, about 10m
Turn-by-Turn Driving Directions
Step-by-step road directions between Mount Sinai, NY and Islip, NY.
1
Start on Shore Road
0.7 mi
·
1 min
·
Shore Road
2
Turn right onto North Country Road
0.2 mi
·
23 sec
·
North Country Road
3
Turn left onto Crystal Brook Hollow Road
0.5 mi
·
54 sec
·
Crystal Brook Hollow Road
4
Turn right onto NY 347
6.7 mi
·
10 min
·
Nesconset Highway
Use the right lane.
5
Continue on NY 347
4.5 mi
·
7 min
·
Smithtown Bypass
6
Take the exit
380 ft
·
16 sec
Toward Route 111, Islip, Smithtown
Use the right lane.
7
Turn left onto NY 111
0.5 mi
·
46 sec
·
Hauppauge Boulevard
8
At end of road, turn right onto NY 111; CR 76
421 ft
·
8 sec
·
Townline Road
9
Keep slight left at fork onto NY 111
1.6 mi
·
2 min
·
Wheeler Road
Use the straight lane.
10
Keep slight right at fork onto NY 111
1.5 mi
·
2 min
·
Joshuas Path
11
Continue on NY 111
4.0 mi
·
7 min
·
Islip Avenue
12
At end of road, turn right onto NY 27A
0.2 mi
·
14 sec
·
Main Street
Use the right lane.
13
Arrive at destination
NY 27A
Fuel & Cost
Regular Gas
$3.34 one way
$6.68 round trip
$4.18/gal
25.4 MPG avg
7 kg CO2
| Fuel Type | $/gal | One Way | Round Trip |
|---|---|---|---|
| midgrade | $4.52 | $3.61 | $7.23 |
| premium | $4.92 | $3.93 | $7.87 |
| diesel | $5.61 | $4.48 | $8.96 |
No toll roads detected on this route.
Drive Cost (one way)
Fuel
$3
Estimated CO2 emission: 7.1 kg one way. Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $2 in charging · 0 stops · 71% less CO2
| Vehicle Type | kWh | Stops | DC Fast | Home Charge |
|---|---|---|---|---|
| Average EV | 6.1 | 0 | $2.13 | $0.97 |
| Efficient EV | 5.1 | 0 | $1.78 | $0.81 |
| EV Truck/SUV | 8.1 | 0 | $2.84 | $1.30 |
Gas CO2
7 kg
EV CO2
2 kg (71% less)
This trip is well within single-charge range for most EVs. No charging stops needed if you start fully charged.
DC fast charging avg $0.35/kWh. Home charging avg $0.16/kWh. US grid CO2: 0.39 kg/kWh.
Travel Intel
Current conditions at both ends of the drive.
Destination
Islip, NY
Afternoon in Islip on Friday
Local time
3:37 PM
EDT
Current temp
44°F
Unavailable
Live forecast
Time zone
Same local time
Origin and destination are on the same clock, so arrival timing is easier to judge at a glance.
Temperature spread
10 degrees cooler at arrival
A meaningful temperature swing is a good cue to rethink layers, water, and how soon you want to arrive.
Road read
33m on the road
Use the two city cards together: check the sky where you start, then compare it with the local time and temperature at arrival.
Weather data from the National Weather Service. Conditions may change; check closer to your travel date.
Frequently Asked Questions
The drive from Mount Sinai, NY to Islip, NY covers 20.3 miles and takes about 33m without stops. Add 15-30 minutes for a fuel or rest stop on longer drives.
The main roads are Nesconset Highway, Smithtown Bypass, Islip Avenue. Expect a mix of highway and local road driving.
This is a comfortable same-day trip.
The midpoint is about 10.2 miles from Mount Sinai, NY. Look for rest areas, gas stations, or food options near the halfway mark.
At current regular gas prices, expect to spend about $3.34 one way. This estimate uses 25.4 MPG — your actual cost will vary with your vehicle's fuel efficiency and current gas prices.
Leave by 9 AM and you'll arrive before lunch. Even a 4 PM departure gets you there before dark in summer.
This is a short but busy drive. With 9 decision points packed into just 20.3 miles, you will need to pay attention to lane changes and exits — but the whole thing is over in 33m.
The main spots that need attention: at 1.3 miles (NY 347 / Nesconset Highway): Lane positioning matters here; at 12.4 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one; at 12.5 miles (NY 111 / Hauppauge Boulevard): Navigation decision point.
On the drive from Mount Sinai, NY to Islip, NY, road signs begin pointing toward Smithtown along the way.
Yes. Nearby national parks include Fire Island National Seashore.
How this page is built
Compiled by the Trip.ovh planning team at COD Solutions Oy from open government datasets — OSRM over OpenStreetMap for geometry, EIA for fuel prices, and NPS for national parks. See our methodology for refresh cadence and limitations.
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