Note 6 at Lu 13:35: This same prophecy by Jesus is recorded in Mt 23:39. There are two possible fulfillments of this prophecy. First, Jesus was not in Jerusalem at this time but was journeying toward it (Lu 13:22). Jerusalem did not see Him again until His triumphant entry (Mt 21:1-11, Mr 11:1-11, Lu 19:29-38, and Joh 12:12-19). At that time the multitudes met Him as He entered the city and cried out word for word, "Blessed is he that cometh in the name of the Lord" (Mt 21:9 and Mr 11:9).

It could also possibly be referring to the second coming of the Lord when every knee shall bow and every tongue confess that Jesus Christ is Lord to the glory of God the Father (Php 2:10-11). That would also fulfill every detail of our Lord's prophecy. It's also possible that both of these are the fulfillment of this prophecy. Other prophecies were fulfilled in more than one way (ex. Lu 4:18).