Smithville, NY to Islip, NY is 361.1 miles and takes about 7h 27m via I 81 and Southern State Parkway, with a fuel budget near $59 and enough daylight to finish in a day. This highway-focused drive primarily traverses the Northeast region, staying within New York. Given its 7.5-hour estimated drive time, it’s a solid option for a single-day trip, though you could certainly break it up if you prefer a more leisurely pace. The majority of the route utilizes major highways, so expect consistent travel speeds and readily available services.
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
180.5 miles from Smithville, NY
A natural place for your longest stop of the day
, about 3h 40m into the drive
.
Islip (pronounced "ICE-lip") is a town on Long Island in the state of New York. Located within Suffolk County, the Town of Islip includes the villages of Brightwaters, Islandia, Ocean Beach and Saltaire. It also includes numerous hamlets including Bay Shore and Sayville which are ferry terminals for Fire Island. Other prominent communities are Bayport, Brentwood, Central Islip, Hauppauge, Islip village (the town seat), and Ronkonkoma.
Top landmarks
•Bayport Aerodrome — airport in Suffolk County, New York, United States
•Connetquot River State Park Preserve — state park in New York
•Modesty — oyster-dredging sloop built in Long Island
Doable as a same-day drive at 7h 27m. Total distance: 361.1 miles.
Family Friendly
Moderate complexity with 2 natural rest stops along the way.
Solo Traveler
7h 27m drive, plan rest stops for pacing.
Drive Character
This trip is predominantly a highway-focused drive, with 71% of the route on major roadways like I 81 and the Southern State Parkway. You'll encounter a substantial uninterrupted stretch of 187.7 miles on I 81, offering a consistent pace for a significant portion of your journey. While the main roads are efficient, be prepared for the typical highway environment with multiple lanes and higher speeds. The transition onto the Southern State Parkway will signal your approach to the destination region, potentially introducing more varied traffic patterns as you near Islip.
Most of the miles stay on highways, which makes pacing and fuel planning easier than turn-by-turn city driving.
There are about 53 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 187.7 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 194.1 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 32 significant decision points across 361.1 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 194.1 miles (US 6): Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one; at 308.6 miles: Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one; at 308.9 miles: Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one.
Critical Maneuvers
5 of 32 key points
These are the spots where you need to pay the most attention. Preview them before you drive.
9
194.1 mi into trip|~3h 56m 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
308.6 mi into trip|~6h 12m 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
308.9 mi into trip|~6h 12m 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
318.3 mi into trip|~6h 27m 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
356.5 mi into trip|~7h 18m 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 Smithville, 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
194.1 mi in|~3h 56m|via US 6
Milford
194.8 mi in|~3h 57m|via I 84; I 380
New York City
308.6 mi in|~6h 12m
Leonia
308.9 mi in|~6h 12m
Teaneck
308.9 mi in|~6h 12m
George Washington Bridge Upper Level
311.1 mi in|~6h 17m
Cross Island Parkway South
329.8 mi in|~6h 43m
Southern State Parkway East
331.3 mi in|~6h 45m
Eastern Long Island
331.3 mi in|~6h 45m
Main Roads
Road
Distance
Duration
I 81
187.7 mi
3h 41m
Keystone Shortway
80 mi
1h 37m
Southern State Parkway
24.7 mi
31m
I 380
23.6 mi
25m
Cross Bronx Expressway
6.6 mi
8m
Christopher Columbus Highway
5.5 mi
5m
Clearview Expressway
5 mi
5m
I 84
3.7 mi
4m
Longest stretch:
I 81
— 187.7 mi, about 3h 41m
Turn-by-Turn Driving Directions
Step-by-step road directions between Smithville, NY and Islip, NY.
1
Start on CR 63
2.0 mi·7 min·Massey Street Road
2
Turn right onto South Harbor Road
2.9 mi·5 min·South Harbor Road
3
Take the ramp
0.3 mi·34 sec
Toward I 81 South
4
Merge onto I 81
51 mi·58 min·I 81
Use the straight / slight right lanes.
5
Keep slight right at fork onto I-81
0.5 mi·33 sec·I-81
6
Continue on I 81
11 mi·14 min·I 81
Use the straight / slight right lanes.
7
Continue on I-81
0.8 mi·48 sec·I-81
8
Continue on I 81
73 mi·1 hr 25 min·I 81
Use the straight / slight right lanes.
9
Keep slight right at fork onto I 81
53 mi·1 hr 3 min·I 81
Toward I 81 South: ScrantonUse the straight lane.
10
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.
11
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.
12
Keep slight right at fork onto I 380
24 mi·25 min·I 380
Exit 4Toward I 380 South: Mount Pocono
13
Keep slight left at fork
1.0 mi·1 min
Exit 1BToward I 80 East: Stroudsburg
14
Merge onto I 80
80 mi·1 hr 37 min·Keystone Shortway
Use the straight / right lanes.
15
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.
16
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.
17
Keep slight right at fork
0.4 mi·38 sec
Exit 70A-BToward Leonia, TeaneckUse the slight right lane.
18
Turn right
0.2 mi·35 sec
Exit 70AToward LeoniaUse the straight / slight right lanes.
19
Turn straight onto CR 56
454 ft·9 sec·Degraw Avenue
20
Continue on CR 56
1.1 mi·2 min·Fort Lee Road
Use the straight / right lanes.
21
Continue on CR 56
469 ft·13 sec·Main Street
22
Take the ramp
472 ft·12 sec
Toward George Washington Bridge
23
Merge onto US 1; US 9; US 46
0.3 mi·28 sec·Bergen Boulevard
Use the straight / slight right lanes.
24
Take the exit
312 ft·4 sec
Toward George Washington Bridge Upper Level
25
Merge onto I 95 EXPR
0.3 mi·20 sec·I 95 EXPR
Use the straight / slight right lanes.
26
Keep slight left at fork onto I 95 EXPR
0.8 mi·1 min·I 95 EXPR
27
Continue on I 95; US 1; US 9
0.6 mi·1 min·George Washington Bridge (upper level)
Use the straight / slight right lanes.
28
Continue on I 95; US 1
0.7 mi·1 min·Trans-Manhattan Expressway
29
Continue on I 95; US 1
4.7 mi·6 min·Cross Bronx Expressway
Use the straight / slight right lanes.
30
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.
31
Merge onto I 295
0.6 mi·58 sec·Throgs Neck Expressway
32
Continue on I 295
2.0 mi·3 min·Throgs Neck Bridge
Use the straight / slight right lanes.
33
Continue on I 295
5.0 mi·5 min·Clearview Expressway
Use the straight / slight right lanes.
34
Continue on NY 24
0.7 mi·1 min·Hollis Court Boulevard
Use the straight lane.
35
At end of road, turn left onto NY 24
0.2 mi·35 sec·Jamaica Avenue
Use the left lane.
36
Turn right onto Hempstead Avenue
0.9 mi·2 min·Hempstead Avenue
37
Turn right onto 225th Street
228 ft·9 sec·225th Street
Use the right lane.
38
Take the ramp
0.2 mi·28 sec
Toward Cross Island Parkway South, Verrazano Bridge
39
Merge onto CI
1.3 mi·1 min·Cross Island Parkway
Use the straight / slight right lanes.
40
Take the exit
0.5 mi·1 min
Exit 25AToward Southern State Parkway East, Eastern Long IslandUse the slight left / straight lanes.
41
Merge onto SO
25 mi·31 min·Southern State Parkway
Use the straight / slight right lanes.
42
Keep slight left at fork onto SO
0.2 mi·16 sec·Southern State Parkway
Use the straight / slight right lanes.
43
Take the exit
0.2 mi·31 sec
Exit 41SToward Bay Shore Road South, Bay ShoreUse the slight right lane.
44
Turn straight onto CR 57
0.5 mi·1 min·Bay Shore Road
45
Continue on CR 57
0.3 mi·43 sec·Howells Road
46
Turn straight onto CR 57
341 ft·6 sec·Sunrise Highway
47
Keep slight right at fork onto CR 57
0.6 mi·1 min·Howells Road
Toward Howells Road SouthUse the right lane.
48
Continue on CR 57
0.2 mi·24 sec·Roosevelt Street
49
Continue on CR 57
0.7 mi·1 min·3rd Avenue
50
At end of road, turn left onto NY 27A
1.1 mi·1 min·East Main Street
51
Continue on Montauk Highway
0.2 mi·17 sec·Montauk Highway
52
Continue on NY 27A
0.8 mi·1 min·Main Street
53
Arrive at destination
NY 27A
Trip Plan
For this single-day journey of 361.1 miles, consider an early morning departure from Smithville, NY, to maximize daylight and ensure a comfortable arrival in Islip, NY. With an estimated 7h 27m of driving, you'll have time for about two stops. Keep an eye on your fuel levels, especially during the 187.7-mile stretch on I 81, as services might be less frequent in certain areas. The $59 fuel cost estimate is helpful for budgeting, but it's always wise to have a little extra on hand. This route's highway-centric nature means you can maintain a steady pace, so focus on efficient stops for breaks and refueling.
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 180.5 miles from Smithville, NY, or about 3h 40m into the drive.
The longest continuous stretch on this route runs about 187.7 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 40m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 180.5 miles or 3h 40m 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 3m
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 Smithville, 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 Smithville, NY
This is one driving day of about 361.1 miles and 7h 27m.
Your first comfortable stop window is around 79 miles from Smithville, 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 187.7 miles.
Where to Stop
Rest stops, refuel points, and overnight suggestions along this route.
Halfway Point
Midpoint
About 180.5 mi from Smithville, NY
· 3h 40m into the drive
The midpoint is around 181.9 miles from Smithville, NY, which is a good place for a longer meal and fuel stop.
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 313.6
Caution: Lower Crypt Access Subject to Safe Conditions
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
~7 min detour
Free
near mile 313.6
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 313.6
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 313.6
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 313.6
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 313.6
Park data from the National Park Service API. Alerts update every 2 hours.
Fuel & Cost
Regular Gas
$59.44 one way
$118.88 round trip
$4.18/gal25.4 MPG avg126 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.52
$64.27
$128.55
premium
$4.92
$69.99
$139.98
diesel
$5.61
$79.73
$159.45
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
$107–$132
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 126.3 kg one way.
Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $38 in charging
· 1 stop
· 67% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
108.3
1
$37.92
$17.33
Efficient EV
90.3
1
$31.60
$14.44
EV Truck/SUV
144.4
1
$50.55
$23.11
Gas CO2
126 kg
EV CO2
42 kg (67% 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
Smithville, NY
Morning
in Smithville on Saturday
Local time
8:01 AM
EDT
Current temp
35°F
Unavailable
Live forecast
Destination
Islip, NY
Morning
in Islip on Saturday
Local time
8:01 AM
EDT
Current temp
44°F
Unavailable
Live forecast
57°F
Ramapo, NY
181 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
9 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 27m 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 Smithville, NY to Islip, NY covers 361.1 miles and takes about 7h 27m 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 180.5 miles from Smithville, NY. Look for rest areas, gas stations, or food options near the halfway mark.
At current regular gas prices, expect to spend about $59.44 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 32 significant decision points across 361.1 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 194.1 miles (US 6): Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one; at 308.6 miles: Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one; at 308.9 miles: Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one.
Between Smithville, NY and Islip, NY, road signs point toward Mt Pocono, Milford, New York City, Leonia, Teaneck and George Washington Bridge Upper Level - among others.
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.
