There is an executive shuttle (Pullman de Morelos) service from the Mexico City airport to Cuernavaca that leaves every hour until 11:30PM.

For those arriving in Terminal 1:

Turn left as you leave customs, go up the electric ramp, follow the “Autobuses” sign and buy your tickets to Cuernavaca with Pullman de Morelos, the cost is about $18 dls.

For those arriving in Terminal 2:

Exit customs, turn right and go to the end of the terminal where the bus station of Pullman de Morelos is located.

Also a private driver can be arranged to pick you up at the airport for around $120 dls.