What was the commercial speed of Concorde? I work on time-space cartography in a historical perspective and need to establish a commercial speed of Concorde aircraft flights based on timetable data. This issue differs from the issue of the maximum speed of planes, because in a time geography perspective I want to consider speed from the point of view of the user, the traveller, i.e timetable commercial speed, and not maximum aircraft speed.

I found some indicative timetables of London-New York in 3,5 hours for 5 850 km which turns into an approximate value of 1 600 km/h. Could anyone confirm these data and this figure?

A related problem is that time-tables are not symmetric, because of trade winds, so that transatlantic routes take longer from Europe to USA that the contrary. I want to use the longest value since it provides a consistent value for minimum time-distance.
The Concorde cruised at 1350mph (~Mach 2.05 at 55,000Ft.) 

Concorde’s fastest transatlantic crossing was on 7 February 1996 when it completed the New York to London flight in 2 hours 52 minutes and 59 seconds.

When it flew the average flight time (was) around 3 hours 30 minutes, but can be slightly longer if the aircraft (needed) to hold before landing at the local airports.

Wind is a huge factor in flying. A headwind or tail wind can mean a big difference in flight time. The Concorde cruised at a significantly higher altitude than most airplanes ~55,000Ft. which means it was subject to very different wind than its sub sonic lower flying counterparts. At that altitude winds in excess of 100Kt are common place. So you could see a 200Kt difference in speed depending on direction. 

Also of note the speed was often called out using Mach's Number (the Concorde flew a bit over Mach 2). However since Mach's number accounts for air density,  Mach 1 at 55,000Ft. is 660MPH which is significantly lower than the often quoted Mach 1 = 760MPH (which is the speed of sound at sea level).  

One of the best sources of info on flying the Concorde is this podcast interviewing one of the pilots.