How long would it take on an airplane to get to the moon?

Air Planes are not acceptable for flight to the moon due to gravity and etc. If you mean Space Shuttles it would take about 7 weeks minimum if a human was inside the space shuttle. Or it could take about a day or two to get there on machine speed.

Air Planes - if they were capable - Are much slower than space shuttles. And would probably take double those times.

Hope I helped!