This 357.8-mile journey from Williamson, NY, to Islip, NY, is designed as a single-day adventure, estimated to take around 7 hours and 30 minutes. You'll primarily navigate via I-81 and the Southern State Parkway, with a significant portion of the drive, 69%, on highways. With an estimated fuel cost of $59 and two planned stops, this route offers a straightforward path through the Northeast region. It's a solid option for getting from point A to point B efficiently within New York State.
Trip Pace
Same-day drive is realistic
A same-day return is possible, but it will make for a full day on the road.
Break Rhythm
2 planned breaks
Plan on a short reset every 3 to 4 hours to stay fresh behind the wheel.
Midpoint
178.9 miles from Williamson, NY
A natural place for your longest stop of the day
, about 3h 45m into the drive
.
Who Is This Route For?
Weekend Trip
Doable as a same-day drive at 7h 30m. Total distance: 357.8 miles.
Family Friendly
Moderate complexity with 2 natural rest stops along the way.
Solo Traveler
7h 30m drive, plan rest stops for pacing.
Drive Character
Expect a predominantly highway-focused drive, with 69% of the 357.8 miles spent on major roadways. You'll encounter a substantial uninterrupted stretch of 128.7 miles on I-81, offering a consistent pace for a significant portion of your trip. While the Keystone Shortway and Southern State Parkway will also feature, the overall character leans towards efficient travel rather than winding scenic byways. This highway-centric profile means you can anticipate relatively high average speeds for most of the journey.
Most of the miles stay on highways, which makes pacing and fuel planning easier than turn-by-turn city driving.
There are about 61 navigation steps in the underlying route data, so the final approach matters more than the middle miles.
I 81 is the longest continuous segment at about 128.7 miles.
How Hard Is This Drive?
This is a straightforward highway drive that stays mostly on I 81 and Keystone Shortway. This route has several spots where lane changes, forks, or exits need your full attention. The trickiest moment comes around 190.7 miles in near US 6.
Driving Effort10/10
High effort - long or complex enough to need steady focus all day
Balances navigation complexity with total wheel time.
This is a demanding drive. With 34 significant decision points across 357.8 miles, you will need to stay alert - especially through interchange areas and urban stretches. Consider splitting it into segments if you are not comfortable with fast highway navigation.
Where does it get tricky?
The main spots that need attention: at 190.7 miles (US 6): Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one; at 305.3 miles: Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one; at 305.6 miles: Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one.
Critical Maneuvers
5 of 34 key points
These are the spots where you need to pay the most attention. Preview them before you drive.
9
190.7 mi into trip|~3h 59m in|US 6
Keep slight right at fork onto US 6 toward I 84 East, I 380 South, US 6 East: Carbondale, Mt Pocono
Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one
Use the slight left / slight right lanes.
Exit 187
Toward I 84 East, I 380 South, US 6 East: Carbo...
8
305.3 mi into trip|~6h 15m in
Keep slight left at fork toward I 95 North: George Washington Bridge, New York City
Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one
Use the straight / slight right lanes.
Toward I 95 North: George Washington Bridge, Ne...
9
305.6 mi into trip|~6h 15m in
Keep slight right at fork toward Leonia, Teaneck
Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one
Use the slight right lane.
Exit 70A-B
Toward Leonia, Teaneck
8
315 mi into trip|~6h 29m in|I 295 / Cross Bronx Expressway
Keep slight right at fork onto I 295 / Cross Bronx Expressway toward I 295 South: Throgs Neck Bridge
Highway fork - watch signs carefully. Lane positioning matters here
Use the straight / slight left lanes.
Exit 6B
Toward I 295 South: Throgs Neck Bridge
9
353.1 mi into trip|~7h 21m in
Take the exit toward Bay Shore Road South, Bay Shore
Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one
Use the slight right lane.
Exit 41S
Toward Bay Shore Road South, Bay Shore
Towns Mentioned on Route Signs
Based on OSRM destination-sign hints, not a full list of every settlement the road passes.
Between Williamson, NY and Islip, NY, road signs point toward Mt Pocono, Milford, New York City, Leonia, Teaneck and George Washington Bridge Upper Level - among others.
Mt Pocono
190.7 mi in|~3h 59m|via US 6
Milford
191.5 mi in|~4h|via I 84; I 380
New York City
305.3 mi in|~6h 15m
Leonia
305.6 mi in|~6h 15m
Teaneck
305.6 mi in|~6h 15m
George Washington Bridge Upper Level
307.8 mi in|~6h 19m
Cross Island Parkway South
326.4 mi in|~6h 46m
Southern State Parkway East
327.9 mi in|~6h 48m
Eastern Long Island
327.9 mi in|~6h 48m
Main Roads
Road
Distance
Duration
I 81
128.7 mi
2h 32m
Keystone Shortway
80 mi
1h 37m
Southern State Parkway
24.7 mi
31m
I 380
23.6 mi
25m
NY 104
22 mi
30m
I 690
8.7 mi
10m
State Highway 370
7.9 mi
10m
Cross Bronx Expressway
6.6 mi
8m
Longest stretch:
I 81
— 128.7 mi, about 2h 32m
Turn-by-Turn Driving Directions
Step-by-step road directions between Williamson, NY and Islip, NY.
1
Start on CR 103
7 ft·4 sec·Main Street
2
Turn right onto NY 21
0.6 mi·58 sec·Lake Avenue
3
Turn right onto NY 104
22 mi·30 min·NY 104
4
Turn right onto CR 163
2.2 mi·2 min·Ridge Road
5
Turn slight right onto NY 370
2.1 mi·2 min·State Route 370
6
Continue on NY 370
7.9 mi·10 min·State Highway 370
7
Continue on NY 370
3.6 mi·7 min·West Main Street
8
Continue on NY 370
1.7 mi·2 min·State Route 370
9
Continue on NY 370
0.7 mi·53 sec·Main Street
10
Continue on NY 370
5.7 mi·8 min·West Genesee Road
Use the left / straight lanes.
11
Take the exit onto NY 31
5.9 mi·7 min·NY 31
Use the left lane.
12
Continue on I 690
8.7 mi·10 min·I 690
Use the straight / slight right lanes.
13
Take the exit
0.2 mi·30 sec
Toward I 81 South: BinghamtonUse the straight / slight right lanes.
14
Merge onto I 81
2.8 mi·4 min·I 81
Use the straight / slight right lanes.
15
Continue on I-81
0.8 mi·48 sec·I-81
16
Continue on I 81
73 mi·1 hr 25 min·I 81
Use the straight / slight right lanes.
17
Keep slight right at fork onto I 81
53 mi·1 hr 3 min·I 81
Toward I 81 South: ScrantonUse the straight lane.
18
Keep slight right at fork onto US 6
0.8 mi·1 min·US 6
Exit 187Toward I 84 East, I 380 South, US 6 East: Carbondale, Mt PoconoUse the slight left / slight right lanes.
19
Continue on I 84; I 380
3.7 mi·4 min·I 84; I 380
Toward I 84 East, I 380 South: Mount Pocono, MilfordUse the straight lane.
20
Keep slight right at fork onto I 380
24 mi·25 min·I 380
Exit 4Toward I 380 South: Mount Pocono
21
Keep slight left at fork
1.0 mi·1 min
Exit 1BToward I 80 East: Stroudsburg
22
Merge onto I 80
80 mi·1 hr 37 min·Keystone Shortway
Use the straight / right lanes.
23
Keep slight right at fork onto I 80
5.5 mi·5 min·Christopher Columbus Highway
Toward I 95: George Washington Bridge Lower LevelUse the slight right lane.
24
Keep slight left at fork
0.3 mi·23 sec
Toward I 95 North: George Washington Bridge, New York CityUse the straight / slight right lanes.
25
Keep slight right at fork
0.4 mi·38 sec
Exit 70A-BToward Leonia, TeaneckUse the slight right lane.
26
Turn right
0.2 mi·35 sec
Exit 70AToward LeoniaUse the straight / slight right lanes.
27
Turn straight onto CR 56
454 ft·9 sec·Degraw Avenue
28
Continue on CR 56
1.1 mi·2 min·Fort Lee Road
Use the straight / right lanes.
29
Continue on CR 56
469 ft·13 sec·Main Street
30
Take the ramp
472 ft·12 sec
Toward George Washington Bridge
31
Merge onto US 1; US 9; US 46
0.3 mi·28 sec·Bergen Boulevard
Use the straight / slight right lanes.
32
Take the exit
312 ft·4 sec
Toward George Washington Bridge Upper Level
33
Merge onto I 95 EXPR
0.3 mi·20 sec·I 95 EXPR
Use the straight / slight right lanes.
34
Keep slight left at fork onto I 95 EXPR
0.8 mi·1 min·I 95 EXPR
35
Continue on I 95; US 1; US 9
0.6 mi·1 min·George Washington Bridge (upper level)
Use the straight / slight right lanes.
36
Continue on I 95; US 1
0.7 mi·1 min·Trans-Manhattan Expressway
37
Continue on I 95; US 1
4.7 mi·6 min·Cross Bronx Expressway
Use the straight / slight right lanes.
38
Keep slight right at fork onto I 295
2.0 mi·2 min·Cross Bronx Expressway
Exit 6BToward I 295 South: Throgs Neck BridgeUse the straight / slight left lanes.
39
Merge onto I 295
0.6 mi·58 sec·Throgs Neck Expressway
40
Continue on I 295
2.0 mi·3 min·Throgs Neck Bridge
Use the straight / slight right lanes.
41
Continue on I 295
5.0 mi·5 min·Clearview Expressway
Use the straight / slight right lanes.
42
Continue on NY 24
0.7 mi·1 min·Hollis Court Boulevard
Use the straight lane.
43
At end of road, turn left onto NY 24
0.2 mi·35 sec·Jamaica Avenue
Use the left lane.
44
Turn right onto Hempstead Avenue
0.9 mi·2 min·Hempstead Avenue
45
Turn right onto 225th Street
228 ft·9 sec·225th Street
Use the right lane.
46
Take the ramp
0.2 mi·28 sec
Toward Cross Island Parkway South, Verrazano Bridge
47
Merge onto CI
1.3 mi·1 min·Cross Island Parkway
Use the straight / slight right lanes.
48
Take the exit
0.5 mi·1 min
Exit 25AToward Southern State Parkway East, Eastern Long IslandUse the slight left / straight lanes.
49
Merge onto SO
25 mi·31 min·Southern State Parkway
Use the straight / slight right lanes.
50
Keep slight left at fork onto SO
0.2 mi·16 sec·Southern State Parkway
Use the straight / slight right lanes.
51
Take the exit
0.2 mi·31 sec
Exit 41SToward Bay Shore Road South, Bay ShoreUse the slight right lane.
52
Turn straight onto CR 57
0.5 mi·1 min·Bay Shore Road
53
Continue on CR 57
0.3 mi·43 sec·Howells Road
54
Turn straight onto CR 57
341 ft·6 sec·Sunrise Highway
55
Keep slight right at fork onto CR 57
0.6 mi·1 min·Howells Road
Toward Howells Road SouthUse the right lane.
56
Continue on CR 57
0.2 mi·24 sec·Roosevelt Street
57
Continue on CR 57
0.7 mi·1 min·3rd Avenue
58
At end of road, turn left onto NY 27A
1.1 mi·1 min·East Main Street
59
Continue on Montauk Highway
0.2 mi·17 sec·Montauk Highway
60
Continue on NY 27A
0.8 mi·1 min·Main Street
61
Arrive at destination
NY 27A
Trip Plan
To make the most of this 7-hour, 30-minute drive, consider an early morning departure to maximize daylight and minimize traffic, especially as you approach the Long Island area. With only two recommended stops, plan them strategically to break up the 357.8 miles effectively. Given the longest stretch is 128.7 miles on I-81, ensure you have adequate fuel before embarking on that segment. The $59 fuel cost is a good estimate, but always keep an eye on your gauge, particularly when transitioning between different highway systems.
Morning Departure
Start early — leave by 6-7 AM to arrive at a reasonable hour.
Evening Departure
This is a long drive — plan for a morning departure or consider splitting it into two days.
You can normally do this drive in one day.
Plan roughly 2 meaningful breaks for fuel, food, and rest.
The halfway point lands around 178.9 miles from Williamson, NY, or about 3h 45m into the drive.
The longest continuous stretch on this route runs about 128.7 miles.
This is a comfortable same-day trip.
Departure
Before you leave
Start with fuel, water, and navigation already sorted so the first hour feels easy.
First stop
Around 79 miles or 1h 47m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 178.9 miles or 3h 45m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Final approach
Final hour starts around 6h 6m
Traffic, exits, and arrival timing usually matter more near Islip, NY than in the middle of the route.
Before You Leave
+
Open the route before leaving Williamson, NY so your first major turns are already loaded.
+
Leave with enough water and a charging cable within reach, not packed away.
+
Check your fuel range against the first long segment, especially if you are starting outside city service areas.
+
Pick one backup stop option before the midpoint in case traffic changes your pacing.
Day 1
Settle into the route from Williamson, NY
This is one driving day of about 357.8 miles and 7h 30m.
Your first comfortable stop window is around 79 miles from Williamson, NY.
This route can stay practical as a one-day drive if traffic stays reasonable.
Plan about 2 real breaks rather than only quick fuel stops.
The longest stretch is on I 81 for about 128.7 miles.
Where to Stop
Rest stops, refuel points, and overnight suggestions along this route.
Halfway Point
Midpoint
About 178.9 mi from Williamson, NY
· 3h 45m into the drive
The midpoint is around 178.9 miles from Williamson, NY, which is a good place for a longer meal and fuel stop.
Before the longest stretch
Fuel check
Top up before I 81 if your tank is already low. That segment runs about 128.7 miles.
Arriving in Islip, NY
The final approach into Islip, NY usually feels slower than the middle of the drive, so avoid planning your tightest schedule at the very end.
Try to arrive with enough fuel left to skip an immediate station stop unless you already know the area around Islip, NY.
After long uninterrupted mileage, take five minutes before the last urban segment to reset and refocus on exits, merges, and city traffic.
These stop ideas are pacing suggestions — the exact town or exit can change with traffic, hotel plans, and fuel range.
National Parks Near This Route
Worth a detour if your schedule allows.
General Grant National Memorial
National Memorial
The final resting place of President Ulysses S. Grant and his wife, Julia, is the largest mausoleum in North America. It testifies to a people’s gratitude for the man who ended the bloodiest conflict...
3 mi from route
~7 min detour
Free
near mile 308.4
Merchant’s clerk, Revolutionary War soldier, first Secretary Treasury of the United States: Alexander Hamilton’s life is memorialized at The Grange, the home he built on a country estate in uptown Man...
3 mi from route
~6 min detour
Free
near mile 308.4
Before the 1960s, almost everything about living authentically as a lesbian, a bisexual person or a gay man was illegal. The Stonewall Uprising on June 28, 1969 is a milestone in the quest for civil r...
9 mi from route
~21 min detour
Free
near mile 308.4
The African Burial Ground stands as the oldest and largest known excavated burial site in North America for both free and enslaved Africans. It offers a profound testament to the enduring legacy of Af...
10 mi from route
~25 min detour
Free
near mile 308.4
Here at Federal Hall, George Washington took the oath of office as the first President of the United States, marking the beginning of the American constitutional republic. This historic site served as...
10 mi from route
~26 min detour
Free
near mile 308.4
Located at the southern tip of Manhattan, Castle Clinton marks the place where New York City began and reflects the growth of both the city and the nation. Built to defend the harbor during the War of...
11 mi from route
~27 min detour
Free
near mile 308.4
Park data from the National Park Service API. Alerts update every 2 hours.
Fuel & Cost
Regular Gas
$58.90 one way
$117.79 round trip
$4.18/gal25.4 MPG avg125 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.52
$63.69
$127.37
premium
$4.92
$69.35
$138.70
diesel
$5.61
$79.00
$158.00
Estimated Tolls: $22.55
George Washington Bridge
$16.00
Throgs Neck Bridge
$6.55
Toll estimates based on average 2024-2025 rates. EZ-Pass/SunPass discounts may lower the actual cost.
Estimated Trip Cost (one way, 1 person)
Fuel
$59
Tolls
$23
Meals
$25–$50
Total
$106–$131
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 125.2 kg one way.
Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $38 in charging
· 1 stop
· 66% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
107.3
1
$37.57
$17.17
Efficient EV
89.5
1
$31.31
$14.31
EV Truck/SUV
143.1
1
$50.09
$22.90
Gas CO2
125 kg
EV CO2
42 kg (66% less)
Plan for 1 charging stop. A 30-minute DC fast charge mid-route should be enough to complete the trip comfortably.
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.
Forecast as of Apr 16, 2026
Origin
Williamson, NY
Late night
in Williamson on Friday
Local time
3:39 AM
EDT
Current temp
42°F
Unavailable
Live forecast
Destination
Islip, NY
Late night
in Islip on Friday
Local time
3:39 AM
EDT
Current temp
78°F
Mostly Sunny
SW 7 to 10 mph3% chanceLive forecast
Flood Warning
Flood Warning issued April 15 at 11:57PM EDT by NWS Binghamton NY
57°F
Ramapo, NY
179 mi in
Seasonal Notes
Summer travel usually means heavier construction, hotter rest stops, and busier weekend traffic around major cities.
Winter travel shortens daylight, so a route that looks manageable on paper can feel much longer after dark.
Holiday weekends tend to make both departure and arrival windows slower than the raw route time suggests.
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
36 degrees warmer at arrival
A meaningful temperature swing is a good cue to rethink layers, water, and how soon you want to arrive.
Road read
7h 30m on the road
Start early — leave by 6-7 AM to arrive at a reasonable hour.
Weather data from the National Weather Service. Conditions may change; check closer to your travel date.
Frequently Asked Questions
The drive from Williamson, NY to Islip, NY covers 357.8 miles and takes about 7h 30m without stops. Add 15-30 minutes for a fuel or rest stop on longer drives.
The main roads are I 81, Keystone Shortway, Southern State Parkway. Most of the drive stays on highways, so watch for ramps and exits.
This is a comfortable same-day trip.
The midpoint is about 178.9 miles from Williamson, NY. Look for rest areas, gas stations, or food options near the halfway mark.
At current regular gas prices, expect to spend about $58.90 one way. This estimate uses 25.4 MPG — your actual cost will vary with your vehicle's fuel efficiency and current gas prices.
Start early — leave by 6-7 AM to arrive at a reasonable hour. This is a long drive — plan for a morning departure or consider splitting it into two days.
Plan about 2 meaningful breaks for fuel, food, or rest. Plan on a short reset every 3 to 4 hours to stay fresh behind the wheel.
This is a demanding drive. With 34 significant decision points across 357.8 miles, you will need to stay alert - especially through interchange areas and urban stretches. Consider splitting it into segments if you are not comfortable with fast highway navigation.
The main spots that need attention: at 190.7 miles (US 6): Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one; at 305.3 miles: Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one; at 305.6 miles: Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one.
Between Williamson, NY and Islip, NY, road signs point toward Mt Pocono, Milford, New York City, Leonia, Teaneck and George Washington Bridge Upper Level - among others.
Yes. Nearby national parks include General Grant National Memorial, Hamilton Grange National Memorial and Stonewall National Monument. There are 6 parks within detour distance of this route.
Data sources
The figures on this page are computed from open government and mapping datasets, not crowdsourced reviews. Distances and geometry come from
OSRM
over
OpenStreetMap.
Fuel cost uses
EIA
weekly regional averages.
National park proximity is from the
NPS API.
Full methodology, refresh cadence, and limitations are documented on the
methodology page.
