Luke 21: 24: And they shall fall by the edge of the sword, and shall be led away captive into all nations: and Jerusalem shall be trodden down of the Gentiles, until the times of the Gentiles be fulfilled.
Romans 11: 25: For I would not, brethren, that ye should be ignorant of this mystery, lest ye should be wise in your own conceits; that blindness in part is happened to Israel, until the fulness of the Gentiles be come in.
There is a distinct difference between the Times of the Gentiles and the Fulness of the Gentiles in the Bible. The Times of the Gentiles refers to the Gentile occupation of Jerusalem, beginning with the conquest of Jerusalem by the Babylonians. Since that time, Jerusalem has been occupied by numerous world powers throughout the pages of history, and this will continue into the Tribulation where it is written in Revelation 11: 1 – 2: And there was given me a reed like unto a rod: and the angel stood, saying, Rise, and measure the temple of God, and the altar, and them that worship therein. But the court which is without the temple leave out, and measure it not; for it is given unto the Gentiles: and the holy city shall they tread under foot forty and two months. It is not until Jesus returns at Armageddon to crush the Gentile powers and set up His Kingdom over the earth that the Times of the Gentiles or foreign occupation of Jerusalem will come to an end.
The Fulness of the Gentiles on the other hand refers to the Dispensation of Grace (or seven church ages) for the Gentiles after the Jews rejected Jesus as their Messiah, and will end with the California earthquake that sinks Los Angeles into the Pacific (the Rapture or translation of the New Testament Bride happening shortly afterward), whereby salvation will no longer be available to the Gentiles anymore. Paul confirms this to us when he stated that Israel’s spiritual blindness will only last until the Fulness of the Gentiles be come in, because after the Bride is raptured into Glory, then the Gospel will go back to Israel, and 144,000 Jews will be sealed by the Holy Ghost under the ministry of Moses and Elijah (Revelation 11: 3; Revelation 7: 4).