How far is Smithtown, NY from Port Jefferson, NY?
The driving distance from Smithtown, NY to Port Jefferson, NY is about 12.2 miles (19.7 km), with a travel time of about 00h 17m by car.
- The straight-line flight distance is about 9.3 miles (14.9 km).
- For a round trip, plan for roughly 00h 35m 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 17m.
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 Smithtown and Port Jefferson.
Turn-by-Turn Driving Directions
Step-by-step road directions between Smithtown and Port Jefferson.
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1
Start on West Main Street
1.3 mi · 2 min · West Main Street
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2
Continue on Middle Country Road
2 mi · 3 min · Middle Country Road
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3
Turn left onto Nesconset Highway
2.3 mi · 3 min · Nesconset Highway
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4
Turn left onto Nicolls Road
3.2 mi · 5 min · Nicolls Road
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5
Take the exit slight right
68 m · 7 sec
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6
Turn straight onto North Country Road
1700 ft · 31 sec · North Country Road
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7
Continue on Route 25A
1.6 km · 2 min · Route 25A
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8
Continue on Main Street
1.2 mi · 2 min · Main Street
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9
Continue on West Broadway
1.4 km · 1 min · West Broadway
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10
Turn right onto Main Street
25 m · 2 sec · Main Street
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11
Arrive at your destination
0 m · 1 sec · Main Street
Car Route Details
A richer read on the saved driving route between Smithtown and Port Jefferson.
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
3.18 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 Smithtown and Partly Cloudy near Port Jefferson.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Smithtown to Port Jefferson?
The road trip is about 12.2 miles (19.7 km) and usually takes 00h 17m 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 Smithtown and 6.2 miles from Port Jefferson.
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 2.9 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 7:54 PM EDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $1.91 one way or $3.83 round trip. Estimated CO2 is about 3.8 kg one way.
What should you check before leaving?
Before you leave, expect Partly Cloudy around Smithtown and Partly Cloudy near Port Jefferson.
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 Smithtown and Port Jefferson. Straight-line distance: 9.29 mi (14.95 km).
#1 Smithtown
Census-designated place in Suffolk County, New York
| Population | 110,876 |
| Coordinates | 40.8559300, -73.2006700 |
| Altitude | 18 |
| Country | United States |
#2 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 |
End: Port Jefferson (-73.06927, 40.94649)
Estimated Travel Time
Distance: 20 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 00h 24m |
| 40 mph (64.37 km/h) | 00h 18m |
| 50 mph (80.47 km/h) | 00h 14m |
| 60 mph (96.56 km/h) | 00h 12m |
| 70 mph (112.65 km/h) | 00h 10m |
| 80 mph (129 km/h) | 00h 09m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $4.45 | $1.91 | $3.83 |
| Mid-grade | $4.98 | $2.14 | $4.28 |
| Premium | $5.38 | $2.31 | $4.63 |
| Diesel | $6.51 | $2.80 | $5.60 |
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