Well, in July of 1840 Samuel Cunard crossed his ship, the Brittania, in 11 days and 4 hours. And by 1901, the German liner the Deutschland, could cross the Atlantic in under 5 days.
I'm sorry this answer is not exact, but I hope you get the main idea.
Sources: BBC - History - British History in depth: Victorian Technology
2 years...give or take 2 years
New York - London 7:00 London - New York 8:00
flight time from London to yonkers, New York
There were no trans-Atlantic flights in 1875. Flight didn't happen until 1903.
It is about six hours flying time from New York to London.
It take's about 9 hours !
It takes about 3 h 50 min to drive from York to London. The trip is 215 miles.
Between two and two and a half hours
2-3 days
15minutes
2014 - 1875 = 139 years
About 7 hours JFK to London Heathrow. It is about 30-40 minutes longer London to New York as you are flying into the prevailing wind.
The time on Long Island in New York is always 5 hours earlier than the time in London.