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
In 1875, traveling from London to New York typically took around 7 to 10 days by transatlantic steamship. The journey duration could vary depending on weather conditions and the specific route taken. Ocean liners of that era, while faster than sailing ships, still required significant time for such crossings.
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.
2-3 days
Between two and two and a half hours
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.