How far is Port Jefferson, NY from Smithtown, NY?
The driving distance from Port Jefferson, NY to Smithtown, NY is about 10.7 miles (17.3 km), with a travel time of about 00h 22m by car.
- The straight-line flight distance is about 9.3 miles (14.9 km).
- For a round trip, plan for roughly 00h 45m 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 22m.
This is a short drive, so your comfort window is wide. Traffic and current weather matter more than the clock.
This departure sits inside the recommended comfort window for the route.
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 Cloudy
Partly Cloudy
Driving Route Map
The map below follows the saved road route between Port Jefferson and Smithtown.
Turn-by-Turn Driving Directions
Step-by-step road directions between Port Jefferson and Smithtown.
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1
Start on Main Street
25 m · 11 sec · Main Street
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2
Turn left onto West Broadway
1.4 km · 1 min · West Broadway
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3
Continue on Main Street
1.2 mi · 2 min · Main Street
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4
Continue on Route 25A
1.6 km · 2 min · Route 25A
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5
Continue on North Country Road
1853 ft · 33 sec · North Country Road
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6
Turn left onto Nicolls Road
3.1 mi · 5 min · Nicolls Road
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7
Take the exit right toward Route 347, Nesconset Highway WEST, Hauppauge, Smithtown
124 m · 11 sec
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8
Merge slight left onto Nesconset Highway
1.6 mi · 2 min · Nesconset Highway
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9
Continue on Smithtown Bypass
3194 ft · 52 sec · Smithtown Bypass
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10
Take the exit slight right toward Route 25, Middle Country Road WEST, Smithtown
648 ft · 10 sec
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11
Turn slight right onto Middle Country Road
1.9 mi · 3 min · Middle Country Road
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12
Continue on East Main Street
1.3 mi · 2 min · East Main Street
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13
Arrive at your destination
0 m · 1 sec · West Main Street
Car Route Details
A richer read on the saved driving route between Port Jefferson and Smithtown.
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.
Nicolls Road
Turn left onto Nicolls Road
3.14 mi · 00h 05m
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 Cloudy leaving Port Jefferson and Partly Cloudy near Smithtown.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Port Jefferson to Smithtown?
The road trip is about 10.7 miles (17.3 km) and usually takes 00h 22m 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?
Centereach is a useful midpoint, sitting about 6.1 miles from Port Jefferson and 4.7 miles from Smithtown.
How much longer is the road route than the straight-line distance?
The direct path is about 9.3 miles (14.9 km), while the road route adds roughly 1.4 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 7:44 PM EDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $1.69 one way or $3.38 round trip. Estimated CO2 is about 3.4 kg one way.
What should you check before leaving?
Before you leave, expect Partly Cloudy around Port Jefferson and Partly Cloudy near Smithtown.
Stop Ideas Near Centereach
Useful break, food, and waypoint ideas within about 15 miles of the route midpoint.
Transit and Meeting Points
Useful pickup, handoff, or rendezvous points close to Centereach.
Bridgeport
Stamford Transportation Center
Union Station
New Rochelle station
Flight Path Map
This map shows the direct air route between Port Jefferson and Smithtown. Straight-line distance: 9.29 mi (14.95 km).
#1 Port Jefferson
Incorporated village in the Town of Brookhaven in Suffolk County, New York
| Population | 8,127 |
| Coordinates | 40.9464900, -73.0692700 |
| Altitude | 1 |
| Country | United States |
#2 Smithtown
Census-designated place in Suffolk County, New York
| Population | 110,876 |
| Coordinates | 40.8559300, -73.2006700 |
| Altitude | 18 |
| Country | United States |
End: West Main Street (-73.200729, 40.855811)
Estimated Travel Time
Distance: 17 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 00h 21m |
| 40 mph (64.37 km/h) | 00h 16m |
| 50 mph (80.47 km/h) | 00h 12m |
| 60 mph (96.56 km/h) | 00h 10m |
| 70 mph (112.65 km/h) | 00h 09m |
| 80 mph (129 km/h) | 00h 08m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $4.45 | $1.69 | $3.38 |
| Mid-grade | $4.98 | $1.89 | $3.79 |
| Premium | $5.38 | $2.05 | $4.09 |
| Diesel | $6.51 | $2.47 | $4.95 |
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 · Oct 15, 2026