Smithtown, NY to Northumberland, NY is 231.9 miles and takes about 4h 55m via NY 17 and the Adirondack Northway, with a fuel budget near $38 and enough daylight to finish in a day. This trip stays within New York State, beginning on Long Island and heading north through the Northeast region. The majority of this route is on major highways, making it a straightforward drive. It's a good option if you're looking for a relatively quick trip between these two points without extensive planning.
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
1 planned break
Plan on a short reset every 3 to 4 hours to stay fresh behind the wheel.
Midpoint
115.9 miles from Smithtown, NY
A natural place for your longest stop of the day
, about 2h 30m into the drive
.
Main Roads
Road
Distance
Duration
NY 17
111.7 mi
2h 8m
Long Island Expressway
24.8 mi
33m
Adirondack Northway
22.2 mi
26m
NJ 17
14.7 mi
18m
I 787
9 mi
12m
NJ 4
6.7 mi
9m
Cross Bronx Expressway
6.6 mi
8m
Route 29
6.1 mi
8m
Longest stretch:
NY 17
— 111.7 mi, about 2h 8m
Traffic on I-495
Hour-of-day weekday pattern from 32 FHWA count stations on your route.
Peak
3 PM
~4,892 veh/hr typical
Quietest
2 AM
~524 veh/hr
Peak-to-quiet ratio
9.3×
busier at peak than in the quiet hours
12a6anoon6p11p
Averaged across 74 weeks of 2023 FHWA Travel Monitoring Analysis System data. Weekday hours only (Mon–Fri).
Turn-by-Turn Driving Directions
Step-by-step road directions between Smithtown, NY and Northumberland, NY.
1
Start on NY 25; NY 25A
0.6 mi·51 sec·West Main Street
2
Keep slight left at fork onto NY 25; NY 25A
179 ft·5 sec·West Main Street
3
Continue on NY 25
4.0 mi·6 min·Jericho Turnpike
4
Take the ramp
0.2 mi·27 sec
Toward SM South: Bay Shore
5
Merge onto SM
1.9 mi·2 min·Sunken Meadow State Parkway
6
Continue on SA
0.8 mi·49 sec·Sagtikos State Parkway
7
Take the exit
0.1 mi·16 sec
Exit S1WToward I 495 West: New YorkUse the slight right lane.
8
Keep slight left at fork
0.2 mi·23 sec
Toward I 495 West: New YorkUse the straight / slight right lanes.
9
Turn straight onto LIE North Service Road
0.4 mi·33 sec·LIE North Service Road
10
Turn straight onto North Service Road
0.1 mi·14 sec·North Service Road
11
Take the ramp
0.2 mi·21 sec
Toward I 495 West: New York
12
Merge onto I 495
25 mi·33 min·Long Island Expressway
Use the straight / slight right lanes.
13
Take the exit
0.2 mi·27 sec
Exit 31N-SToward Cross Island Parkway, Whitestone Bridge, Kennedy AirportUse the straight / slight right lanes.
14
Keep slight right at fork
0.3 mi·38 sec
Exit 31NToward Cross Island Parkway North, Whitestone BridgeUse the slight left / slight right lanes.
15
Merge onto CI
3.1 mi·4 min·Cross Island Parkway
Use the straight / slight right lanes.
16
Take the exit
0.6 mi·1 min
Exit 33Toward I 295 North: Throgs Neck Bridge, Bronx, New EnglandUse the straight / slight right lanes.
17
Merge onto I 295
1.8 mi·3 min·Throgs Neck Bridge
18
Continue on I 295
0.7 mi·1 min·Throgs Neck Expressway
Use the straight / slight right lanes.
19
Keep slight left at fork onto I 295
6.6 mi·8 min·Cross Bronx Expressway
Use the straight / slight right lanes.
20
Keep slight left at fork onto I 95; US 1
0.7 mi·1 min·Trans-Manhattan Expressway
Toward Upper Level
21
Continue on I 95; US 1
0.6 mi·59 sec·George Washington Bridge (upper level)
22
Continue on I 95 EXPR; US 1 EXPR; US 9 EXPR
0.5 mi·48 sec·I 95 EXPR; US 1 EXPR; US 9 EXPR
23
Keep slight left at fork onto I 95 EXPR; US 1 EXPR; US 9 EXPR
0.6 mi·39 sec·I 95 EXPR; US 1 EXPR; US 9 EXPR
Use the straight / slight right lanes.
24
Keep slight left at fork onto I 95 EXPR; NJTP
0.1 mi·8 sec·I 95 EXPR; NJTP
25
Take the exit
0.2 mi·22 sec
Toward I 95 South, NJTP South: HackensackUse the straight / slight right lanes.
26
Keep slight right at fork
0.2 mi·23 sec
Exit 72AToward NJ 4 West: ParamusUse the slight left / slight right lanes.
27
Merge onto NJ 4
6.7 mi·9 min·NJ 4
Use the slight right lane.
28
Take the exit
0.2 mi·26 sec
Toward GSP South, NJ 17 South, GSP North, NJ 17 North: Grand State Plaza, Newark, MahwahUse the straight lane.
29
Keep slight right at fork
0.2 mi·36 sec
Toward NJ 17 North: MahwahUse the straight / slight right lanes.
30
Merge onto NJ 17
3.3 mi·4 min·NJ 17
Use the straight / slight right lanes.
31
Continue on NJ 17
7.3 mi·9 min·NJ 17
Use the straight / right lanes.
32
Continue on NJ 17
0.7 mi·50 sec·NJ 17
33
Continue on NJ 17
3.3 mi·4 min·NJ 17
34
Continue on I 287; NY 17
0.2 mi·10 sec·I 287; NY 17
35
Keep slight left at fork onto NY 17
112 mi·2 hr 8 min·NY 17
Toward I 87 North, NY 17 North, New York State Thruway North: AlbanyUse the straight / slight right lanes.
36
Take the exit
0.3 mi·50 sec
Exit 23Toward I 787, US 9W: Albany, TroyUse the slight right lane.
37
Continue on I 787
9.0 mi·12 min·I 787
Use the straight / slight right lanes.
38
Keep slight left at fork onto NY 787
0.4 mi·29 sec·NY 787
39
Take the exit
0.3 mi·50 sec
Exit 9WToward NY 7 West: Schenectady, Saratoga SpringsUse the right lane.
40
Merge onto NY 7
3.1 mi·3 min·NY 7
41
Take the exit
0.8 mi·1 min
Toward I 87 North: Saratoga Springs, Glens Falls
42
Merge onto I 87
22 mi·26 min·Adirondack Northway
43
Take the exit
0.3 mi·39 sec
Exit 14Toward NY 9P, NY 29: Saratoga Springs, Schuylerville
44
Keep slight right at fork
0.2 mi·24 sec
45
Turn straight onto NY 9P
0.4 mi·42 sec·Union Avenue
46
Turn right onto Henning Road
0.9 mi·1 min·Henning Road
47
Turn right onto NY 29
0.7 mi·1 min·Lake Avenue
48
Continue on NY 29
6.1 mi·8 min·Route 29
49
Continue on NY 29
2.1 mi·3 min·Lake Avenue
50
Continue on NY 29
0.3 mi·57 sec·Spring Street
51
Turn left onto US 4; NY 32
1.8 mi·3 min·Broad Street
52
Keep slight right at fork onto US 4
42 ft·0 sec·US 4
53
Arrive at destination
US 4
Trip Plan
Given the 4h 55m estimated drive time and 231.9 miles, this trip is easily achievable in a single day. To make the most of your daylight, aim to depart Smithtown in the morning. Consider a brief stop around the halfway point, perhaps after the 111.7-mile stretch on NY 17, to stretch your legs. Keep an eye on your fuel gauge, as the estimated cost is $38, and plan your refueling stops accordingly, especially since most of the drive is on the highway. This relatively short distance means you have flexibility to depart later if needed.
Morning Departure
An early start around 7-8 AM gets you there with plenty of daylight left.
Evening Departure
A late afternoon start means arriving after dark. Morning is better.
You can normally do this drive in one day.
Plan roughly 1 meaningful break for fuel, food, and rest.
The halfway point lands around 115.9 miles from Smithtown, NY, or about 2h 30m into the drive.
The longest continuous stretch on this route runs about 111.7 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 51 miles or 1h 12m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 115.9 miles or 2h 30m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Final approach
Final hour starts around 3h 58m
Traffic, exits, and arrival timing usually matter more near Northumberland, NY than in the middle of the route.
Before You Leave
+
Open the route before leaving Smithtown, 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.
Day 1
Settle into the route from Smithtown, NY
This is one driving day of about 231.9 miles and 4h 55m.
Your first comfortable stop window is around 51 miles from Smithtown, NY.
This route can stay practical as a one-day drive if traffic stays reasonable.
Plan about 1 real break rather than only quick fuel stops.
The longest stretch is on NY 17 for about 111.7 miles.
Where to Stop
Rest stops, refuel points, and overnight suggestions along this route.
Place data sourced from public business listings. Hours and availability may vary.
Heads-up: tricky spots
5 of 35
5 decision points cluster between mile 7.6 and 49.3 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
8
7.6 mi into trip|~10m in
Keep slight left at fork toward I 495 West: New York
Highway fork - watch signs carefully. Lane positioning matters here
Use the straight / slight right lanes.
Toward I 495 West: New York
8
33.3 mi into trip|~46m in
Take the exit toward Cross Island Parkway, Whitestone Bridge, Kennedy Airport
Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one
Use the straight / slight right lanes.
Exit 31N-S
Toward Cross Island Parkway, Whitestone Bridge,...
10
33.5 mi into trip|~46m in
Keep slight right at fork toward Cross Island Parkway North, Whitestone Bridge
Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one
Use the slight left / slight right lanes.
Exit 31N
Toward Cross Island Parkway North, Whitestone B...
8
36.9 mi into trip|~51m in
Take the exit toward I 295 North: Throgs Neck Bridge, Bronx, New England
Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one
Use the straight / slight right lanes.
Exit 33
Toward I 295 North: Throgs Neck Bridge, Bronx,...
9
49.3 mi into trip|~1h 10m in
Keep slight right at fork toward NJ 4 West: Paramus
Highway fork - watch signs carefully. Lane positioning matters here
Use the slight left / slight right lanes.
Exit 72A
Toward NJ 4 West: Paramus
Fuel & Cost
Regular Gas
$40.55 one way
$81.09 round trip
$4.44/gal25.4 MPG avg81 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.97
$45.39
$90.79
premium
$5.38
$49.11
$98.22
diesel
$6.51
$59.41
$118.82
Estimated Tolls: $22.83
George Washington Bridge
$16.00
Throgs Neck Bridge
$6.55
Jericho Turnpike
(4 mi)$0.28
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
$41
Tolls
$23
Meals
$25–$50
Total
$88–$113
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 81.1 kg one way.
Driving Electric?
About $24 in charging
· 0 stops
· 67% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
69.6
0
$24.35
$11.13
Efficient EV
58
0
$20.29
$9.28
EV Truck/SUV
92.8
1
$32.47
$14.84
Gas CO2
81 kg
EV CO2
27 kg (67% less)
Plan for 0 charging stops, roughly every 270 miles. Allow 25-40 minutes per stop at a DC fast charger.
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 Oct 16, 2026
Origin
Smithtown, NY
Morning
in Smithtown on Saturday
Local time
8:45 AM
EDT
Current temp
71°F
Rain Showers
S 13 mph96% chanceLive forecast
Wind Advisory
Wind Advisory issued October 16 at 8:26AM EDT until October 16 at 4:00PM EDT by NWS Burlington VT
Destination
Northumberland, NY
Morning
in Northumberland on Saturday
Local time
8:45 AM
EDT
Current temp
69°F
Rain Showers
S 9 to 13 mph98% chanceLive forecast
Wind Advisory
Wind Advisory issued October 16 at 8:26AM EDT until October 16 at 4:00PM EDT by NWS Burlington VT
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
2 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
4h 55m on the road
An early start around 7-8 AM gets you there with plenty of daylight left.
Weather data from the National Weather Service. Conditions may change; check closer to your travel date.
National Parks Near This Route
Worth a detour if your schedule allows.
Hamilton Grange National Memorial
National Memorial
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...
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...
In 1777, a large British invasion force met an equally large American army here at Saratoga. After two intense battles, an eight-mile retreat, and a three-day siege, British General John Burgoyne surr...
7 mi from route
~18 min detour
Free
near mile 223.9
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...
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...
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...
Park data from the National Park Service API. Alerts update every 2 hours.
More Details
What kind of drive is this?
With 84% of this route on highways, expect a lot of time on major roads like the Long Island Expressway and the Adirondack Northway. You'll encounter the longest continuous stretch of highway driving for 111.7 miles on NY 17. The transition from primarily highway to surface roads will likely occur as you approach your destination in Northumberland. Be prepared for a high volume of exits and entrances for a significant portion of the drive.
84% highway — fuel and pacing are the main things to plan.
53 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 111.7 mi on NY 17.
How Hard Is This Drive?
10/10
This is a straightforward highway drive that stays mostly on NY 17 and Long Island Expressway. This route has several spots where lane changes, forks, or exits need your full attention. The trickiest moment comes around 7.6 miles in.
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 35 significant decision points across 231.9 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 7.6 miles: Highway fork - watch signs carefully. Lane positioning matters here; at 33.3 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one; at 33.5 miles: Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one.
Elevation Profile
Mostly flat terrain
523 ft54 ft
Total Climb
729 ft
Total Descent
672 ft
Highest Point
523 ft
~82.8 mi in
Elevation Range
469 ft
Towns Mentioned on Route Signs
Based on OSRM destination-sign hints, not a full list of every settlement the road passes.
Between Smithtown, NY and Northumberland, NY, road signs point toward Kennedy Airport, Cross Island Parkway North, Bronx, New England, Upper Level and Njtp South: Hackensack - among others.
Smithtown is a town of 117,000 people (2016) in Suffolk County, on Long Island, in New York. Smithtown is comprised of the villages and hamlets of Commack (in part, with the Town of Huntington), Fort Salonga (in part, with the Town of Huntington), Hauppauge (in part, with the Town of Islip), Head of the Harbor, Kings Park, Lake Ronkonkoma (in part with the Town of Brookhaven and Town of Islip), Nesconset, Nissequogue, Smithtown, St. James, & Village of the Branch.
Doable as a same-day drive at 4h 55m. Total distance: 231.9 miles.
Family Friendly
Moderate complexity with 1 natural rest stops along the way.
Solo Traveler
4h 55m drive, comfortable solo distance.
First-Time Driver
Mostly highway driving (84%). Some complex stretches to watch for.
Frequently Asked Questions
The longest stretch is about 111.7 miles on NY 17. The full list of main roads is in the Roads section above.
Expect about $22.83 in tolls one way, starting with George Washington Bridge. Most Northeast and Midwest toll agencies accept E-ZPass; in the West and Texas, transponders like TxTag or FasTrak apply. If you do not have a transponder, cashless tolling plates will mail a bill to the vehicle's registered address — usually with a surcharge, so a rental-car toll pass is often cheaper than paying by mail.
Yes — we found about 17 rest areas or service plazas within a short detour of the route (from OpenStreetMap). See the Rest Stops tab under Nearby Places for locations and mile markers. Plan to stretch, use the bathroom, and top off fluids every 2–3 hours on longer drives.
It helps. This route has a higher-than-average number of complex decision points, which get harder in the dark. If the last hour of the trip is on surface roads or mountain grades, aim to arrive at Northumberland, NY before sunset when you can. Check the Trip Plan for departure windows that land you in daylight.
Only with planning. This is a long drive for kids — consider splitting it into two days rather than pushing through. Plan at least 1 meaningful breaks. There are 17 rest areas along the route for bathroom stops.
The main spots that need attention: at 7.6 miles: Highway fork - watch signs carefully. Lane positioning matters here; at 33.3 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one; at 33.5 miles: Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one.
Yes — Hamilton Grange National Memorial, General Grant National Memorial and Saratoga National Historical Park (6 total within detour distance). See the National Parks section for detour distances and tips on detours.
Possible but tiring. At 4.9 hours each way, an in-and-out day trip would put you behind the wheel for 9.8 hours — manageable with a long break at Northumberland, NY, but most travelers stay overnight.
