It depends if you're starting from SW like San Diego, Ca. heading NE to New York. Or if you're starting from The west like San Francisco heading East to NY. Or you're starting from Seattle Wa.,heading SE to Miami, FL. Best website to know mileage is "Mapquest.com."
This question could be answered in several different ways. One way of answering the question would be to find the easternmost and westernmost points in the contiguous 48 states and find the distance between them on a great circle route (which is the shortest distance between two points on a globe). Another way would be to find the longest great circle route between any two points within the contiguous US. A third way would involve eliminating any answers from the second way where the route leaves US territory.
The longest great circle route distance from West Quoddy Head to the West Coast is 2,897 miles (4,662 km), ending at the Sea Lion Rocks in California. Some of this path is over Canada. All great circle routes between extreme points of Maine and the West Coast go outside the US.
The greatest distance (on a great circle route) entirely within the 48 contiguous US states is 2,802 miles (4,509 km), between Florida and the state of Washington.
Distances as great as 2,877 miles (4,630 km) can be found between southeast Florida and northwest Washington by leaving the 48 contiguous states to go over the Gulf of Mexico.
Now, if you don't take a great circle route but instead use the roads (e.g. planning a road movie-like trip), a good candidate is West Quoddy Head, ME, to Sea Lion Rocks CA, All without leaving the US territory.
An even further distance would be Madawaska, ME, to Sea Lion Rocks CA, but the exact distance without leaving the U.S. territory is harder to compute.
Note 1: To avoid confusion, this answer considered distances within the 48 contiguous states rather than the "continental US" - which may or may not include Alaska.
Note 2: The tool used to find distances across the US on great circle routes was GoogleEarth.
Note3: Commonly, the answer to this question is rounded off to 3,000 miles or 4,800 km.
The longest distance that travels entirely across the United States is from northwest Washington to southeast Florida and is about 2800 miles, or 4500 kilometers. The distance between northeast Maine and the West Coast is greater, but much of this route passes through Canada.
Yes, the diameter of the moon is about 3474 km, while the distance across the US (continental) is approximately 4500 km. So, the moon's diameter is indeed a little less than the distance across the US.
Calafornia
Florida.
The Continental Divide Trail. It follows the continental divide in the Rocky Mountains for approximately 3,000 miles from Canada to Mexico.
Alaska has the longest coastline among the continental U.S. states. Its coastline stretches for over 6,600 miles along the Pacific Ocean to the south and west and the Arctic Ocean to the north, due to its unique geography with numerous bays, fjords, and islands.
The US tapers from about 3200 miles across in the north to about 2500 miles across in the south.
The distance between California and New York is probably across the US. It is about 2,973 miles and it takes about 1 day 21 hours.
The widest distance across the US is between West Quoddy Head, Maine, and Cape Alava, Washington. The distance is 14,232,648.413 feet. This is equal to 3,481,811,123.62824 cm.
40 degrees north
not sure of the distance but I believe it would be Barrow, AK to Key west, FL
around 3,000 miles