Chris Brown -- I May Miss My D.C. Hearing ... Con Air Sucks!

Chris Brown learned a lesson this week ... what it must have been like travelling across the country by stagecoach ... because four days into his journey he is still not in Washington D.C.

TMZ broke the story ... Brown was taken from his L.A. County jail cell Thursday by U.S. Marshals for the cross country trip.

We're told he made several stops along the way and typically when a prisoner lands he is taken to a nearby jail to wait for the next available flight.

Brown's lawyer Mark Geragos will be in a D.C. courtroom Monday trying to get his client's case dismissed on grounds of grand jury misconduct. It's unclear if Chris will make it to the hearing.

Brown will stand trial April 17th for allegedly assaulting a man outside a D.C. hotel.

A typical commercial flight from L.A. to D.C. takes 4 hours and 40 minutes.