For small trips, the taxi is the best choice, so I recommend you to read this other section where I explain the routes, prices, stops etc.Let's have a look at all the combinations.
Tangier is approximately 1 hour from Tetouan, and you can come by taxi or bus. There are departures from both transports constantly, especially from taxis. Remember that once you get to the airport you must take a taxi to the center of Tangier and from there take the bus or the collective taxi to Tetuan, that is, there's not direct taxis or buses airport-Tetuan . (Unless you contract it privately) The price of the taxi from the airport to the center of Tangier is 100dh (since it is not shared), the bus to Tetuan is 30dh per room.