How far is Smithtown, NY from Mamaroneck, NY?
The driving distance from Smithtown, NY to Mamaroneck, NY is about 52.1 miles (83.8 km), with a travel time of about 01h 16m by car.
- The straight-line flight distance is about 28.5 miles (45.9 km).
- For a round trip, plan for roughly 02h 32m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 8:00 AM to 10:00 AM EDT.
Reverse, save, or send this route
This route works well as a day trip with time at the destination. Copy the route link, send it to another device, or print a clean version before you head out.
This route works well as a day trip with time at the destination.
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 01h 16m.
A morning start gives you useful time at the destination and keeps the return out of the late evening.
You are leaving earlier than the recommended window, which gives you extra margin for breaks and traffic.
Halfway Point
A useful midpoint for breaks, coffee, or meeting in the middle.
Village in Nassau County, New York, United States of America
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 Mamaroneck.
Turn-by-Turn Driving Directions
Step-by-step road directions between Smithtown and Mamaroneck.
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1
Start on West Main Street
2964 ft · 52 sec · West Main Street
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2
Keep slight left to continue on West Main Street
55 m · 5 sec · West Main Street
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3
Continue on Jericho Turnpike
4 mi · 6 min · Jericho Turnpike
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4
Take the ramp slight right toward SM South: Bay Shore
1110 ft · 27 sec
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5
Merge slight left onto Sunken Meadow State Parkway
1.9 mi · 2 min · Sunken Meadow State Parkway
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6
Continue on Sagtikos State Parkway
1.2 km · 50 sec · Sagtikos State Parkway
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7
Take the exit slight right toward I 495 West: New York
688 ft · 17 sec
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8
Keep slight left to continue on I 495 West: New York
955 ft · 23 sec
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9
Turn straight onto LIE North Service Road
1987 ft · 34 sec · LIE North Service Road
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10
Turn straight onto North Service Road
770 ft · 14 sec · North Service Road
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11
Take the ramp slight left toward I 495 West: New York
879 ft · 22 sec
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12
Merge slight left onto Long Island Expressway
24.8 mi · 34 min · Long Island Expressway
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13
Take the exit slight right toward Cross Island Parkway, Whitestone Bridge, Kennedy Airport
1267 ft · 27 sec
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14
Keep slight right to continue on Cross Island Parkway North, Whitestone Bridge
1604 ft · 38 sec
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15
Merge slight left onto Cross Island Parkway
3.1 mi · 5 min · Cross Island Parkway
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16
Take the exit slight right toward I 295 North: Throgs Neck Bridge, Bronx, New England
2905 ft · 1 min
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17
Merge slight left onto Throgs Neck Bridge
1.8 mi · 3 min · Throgs Neck Bridge
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18
Continue on Throgs Neck Expressway
1.1 km · 1 min · Throgs Neck Expressway
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19
Keep slight right to continue on Throgs Neck Expressway
1.8 mi · 3 min · Throgs Neck Expressway
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20
Merge slight right onto Bruckner Expressway
1 mi · 2 min · Bruckner Expressway
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21
Continue on New England Thruway
1074 ft · 18 sec · New England Thruway
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22
Take the exit slight right toward Hutchinson Parkway North
131 m · 15 sec
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23
Keep slight left to continue on Hutchinson River Parkway North
912 ft · 31 sec
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24
Merge slight left onto Hutchinson River Parkway
1.5 mi · 2 min · Hutchinson River Parkway
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25
Take the exit slight right toward I 95 North: New Haven
1570 ft · 44 sec
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26
Merge slight left onto New England Thruway
5.9 mi · 8 min · New England Thruway
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27
Take the exit slight right toward Fenimore Road, Mamaroneck
1118 ft · 26 sec
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28
Turn right onto Fenimore Road
1.1 km · 2 min · Fenimore Road
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29
At the end of the road, turn left onto West Boston Post Road
1596 ft · 29 sec · West Boston Post Road
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30
Arrive at your destination
0 m · 1 sec · East Boston Post Road
Car Route Details
A richer read on the saved driving route between Smithtown and Mamaroneck.
Highway-focused drive
Most of the mileage stays on named highways, so the important moments are ramps, exits, merges, and the final local approach.
Long Island Expressway
Merge slight left onto Long Island Expressway
24.8 mi · 00h 34m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A comfortable day-trip route
This route works well as a day trip. You can leave in the morning, spend meaningful time at the destination, and still return the same day.
Partly Cloudy leaving Smithtown and Partly Cloudy near Mamaroneck.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Smithtown to Mamaroneck?
The road trip is about 52.1 miles (83.8 km) and usually takes 01h 16m in normal driving conditions.
Is this a same-day trip or an overnight route?
This route works well as a day trip. You can leave in the morning, spend meaningful time at the destination, and still return the same day.
What is the halfway point on this route?
Old Westbury is a useful midpoint, sitting about 26 miles from Smithtown and 26.1 miles from Mamaroneck.
How much longer is the road route than the straight-line distance?
The direct path is about 28.5 miles (45.9 km), while the road route adds roughly 23.6 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 8:00 AM to 10:00 AM EDT. If you want a more comfortable same-day return, try to leave by 3:58 PM EDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $8.18 one way or $16.37 round trip. Estimated CO2 is about 16.4 kg one way.
What should you check before leaving?
Before you leave, expect Partly Cloudy around Smithtown and Partly Cloudy near Mamaroneck.
Stop Ideas Near Old Westbury
Useful break, food, and waypoint ideas within about 15 miles of the route midpoint.
Flushing Town Hall
Queens City Clerk
New Rochelle City Court
Transit and Meeting Points
Useful pickup, handoff, or rendezvous points close to Old Westbury.
New Rochelle station
Stamford Transportation Center
Yonkers station
Pennsylvania Station
Flight Path Map
This map shows the direct air route between Smithtown and Mamaroneck. Straight-line distance: 28.51 mi (45.88 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 Mamaroneck
Town in Westchester County, New York
| Population | 29,343 |
| Coordinates | 40.9487100, -73.7326300 |
| Altitude | 0 |
| Country | United States |
End: Mamaroneck (-73.73263, 40.94871)
Estimated Travel Time
Distance: 84 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 01h 44m |
| 40 mph (64.37 km/h) | 01h 18m |
| 50 mph (80.47 km/h) | 01h 02m |
| 60 mph (96.56 km/h) | 00h 52m |
| 70 mph (112.65 km/h) | 00h 44m |
| 80 mph (129 km/h) | 00h 38m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $4.45 | $8.18 | $16.37 |
| Mid-grade | $4.98 | $9.17 | $18.33 |
| Premium | $5.38 | $9.90 | $19.81 |
| Diesel | $6.51 | $11.98 | $23.95 |
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