Here’s What Our Popes have said:
"Pope Palagius II ( A,D, 578-590) "Consider the fact that whoever has not been in the peace and unity of the Church cannot have the Lord… Although given over to flames and fires, they burn, or, thrown to wild beasts, they lay down their lives, there will not be for them that crown of faith but the punishment of faithlessness… such a one can be slain, he cannot be crowned…
if slain outside the Church, he cannot attain the rewards of the Church."
Note: Denzinger or Enchiridion Symbolorum contains all the major pronouncements of the Popes-either defining alone or at the head of their bishops in Council-and all the ex cathedra
definitions.
Pope Saint Gregory the Great ( A.D. 590-604 ) : " Now the Holy Church proclaims that God cannot be truly worshipped saving within herself, asserting that all they that are without her shall never be saved."
( Moralia )
Pope Sylvester II ( A.D. 991 ) " I profess that outside the Catholic Church no one is saved."
Profession of faith made as Archbishop of Reims
Pope Innocent III ( A.D. 1198-1216 ) " With our hearts we believe and with our lips we confess but one Church, not that of the heretics, but the Holy Roman Catholic and Apostolic Church, outside of which we believe no one is saved."
Denzinger 423
Pope Boniface VIII ( A.D. 1302 ) " There is only one Catholic Church; this we firmly believe and profess without qualification. Outside this Church there is no salvation and no remission of sins. For at the time of the Deluge there existed only one Ark, the figure of the one Church. And all things outside this Ark perished."
" Unam Sanctum" Denzinger 468
Pope Leo XIII ( A.D.1878-1903 ) " This is our last lesson to you; receive it, engrave it in your minds, all of you: by God’s commandment salvation is to be found nowhere but in the Church."
Encyclical “Annum Ingressi Sumus”
Pope Paul VI " The Catholic Church alone is the Body of Christ, of which He is Head and Savior. The people of God and the Mystical Body of Christ are one and the same thing, both of them designating the Church. Membership in the Church requires conditions other than Baptism alone; it requires identical faith and unity of communion, so that by means of the Catholic Church alone, which is the unrestricted instrument of salvation, is it possible to obtain the fullness of the means of salvation. Indeed, the Church is both a sure and exclusive means of attaining salvation. We must always remember the unity of the Mystical Body outside which there is no salvation, for there is no entering into salvation outside the Church. Outside this Body, the Holy Spirit gives life to no one: those who are enemies to unity do not participate in the charity of Divine life; those outside the Church do not possess the Holy Spirit.
The entrance to salvation is open to no one outside the Church!"
Code:
General Audiences May 15 and June 12 1974
The Wanderer May 30 and July 4, 1975
Losservatore Romano June 8, 1972
Seems Pretty clear.