How long does it take to fly from Las Vegas to Paris?

You would have to do a connection flight most likely with American Airlines or British Airways. It is impossible to this date to fly Directly to Paris from Las Vegas.

It takes about 5-6hours to fly from Las Vegas to New York on jetBlue.

It takes another 6-7 1/2 hours to fly New York to Paris, France on American Airlines.

Or you could do Las Vegas to Dallas, Texas on American Airlines which may be 2- 2 1/2 hours long.

Then do Dallas to Paris on American Airline's Boeing 777-200 jet which can take 9-10 hours long.

In total it should take 11- 13 and a half hours long. I'm a pilot in training who flies these routes on a training simulator and this is how long it takes me to do it from point A to B. These times have also been double-checked.