basically: llegar=arrive venir=come LLEGAR --change from position a place from another place: cuando lleguemos a casa, cenaremos.=when we arrive at home, we'll eat dinner.(we are not there so we "lleguaremos") --- Achieve a particular goal, especially a position or profession:: ese chico llegará a presidente.=that boy will become the president. -- to achieve or manage to do something: el llegó a reunir más de cien obras de arte.=he managed to gather more than one hundred works of art. VENIR --Go or move to where the speaker is: When will you come and see us? Maybe I'll go next month.= ¿Cuándo vendrás a vernos? A lo mejor iré el mes que viene. ---Getting to the place where the speaker is,to stay in it::The carpenter hasn't come yet= todavía no ha venido el carpintero. ---Come from a place: This chocolate comes from Switzerland=este chocolate viene de Suiza. there are more examples but I can't remeber now....XD

When you say ¿Ya vienes? = Are you on your way here? ¿Ya vas llegando? = Are you almost here? Answers: Ya voy = I'm coming Ya estoy llegando = I'm almost there It's not a replacement but both of them can be used for the same purpous sometimes. -Venir = To come -Llegar = To be getting there Venir es el traslado, llegar es el punto final del traslado.

La pregunta debería escribir: ¿Cuál es la diferencia entre...y ...? Saludos!!