Satan thought he had defeated God's plan when Jesus died on the cross. 

     He was unable to realize that the Cross, which appeared to represent Christ's defeat, ultimately won salvation for all who would trust in Jesus.

Satan's access to the heavenlies will end half-way through the seven-year treaty [of the Great Tribulation period] when he and his angels are cast out of heaven by Michael, the archangel.

       When he is thrown from heaven to the earth, he will totally possess the soul of the wicked dictator who will take  over the revived Roman Empire.

            Then this man will become the Antichrist, satan possessed. At that time he will force the people to worship him as god.

Since his fall, satan has kept his access to some parts of the heavenlies and also the earth.

     He doesn't rule in hell as some mediaeval mythology tells us. He will not descend into hell until Jesus casts him into the Lake of Fire after his final rebellion at the end of the Millennium [the 1000 year reign of Jesus Christ].

Jesus referred to satan as a king of an evil kingdom in Matthew 12:24-30.

      Daniel 10:13 refers to demonic fallen angels that are associated with particular kingdoms. It suggests the extent of the spiritual warfare in the heavens that will eventually end with the Battle of Armageddon.

Isaiah the prophet tells us about the fall of satan in chapter 14:12-13.

       He was created as a "son of the morning" or "morning star" without sin. But, because of his pride in his beauty and wisdom, he rose in rebellion against God. 

             The Bible calls satan "the prince of the power of the air" in Ephesian 2:2 because he had power over the earth since the fall of Adam and Eve.