So AFAIK the orthodox Muslim belief is that Jesus will return and lead the war against Dajjal when end times are near.
However, I've troubles in believing in this due to two reasons.
It is not mentioned in the Qur'an at all. It seems weird to me that God will leave out such an important information out of His book.
In Qur'an 7:137 God says:
They ask you, [O Muhammad], about the Hour: when is its arrival? Say, "Its knowledge is only with my Lord. None will reveal its time except Him. It lays heavily upon the heavens and the earth. It will not come upon you except unexpectedly." They ask you as if you are familiar with it. Say, "Its knowledge is only with Allah , but most of the people do not know."
For me, this verse clearly says that the Qiyamah will come unexpectedly. Now how is that compatible with the 2nd coming of the Jesus ? If it's a sign of the Last Hour, then the Last Hour is not that unexpected right? I've even heard some Muslims say that the Qiyamah will happen after 40 years of Jesus' 2nd coming.
It seems plausible to me that this belief has came into Islam from the Christians that early Muslims have interacted. Though, I might be wrong.
In short, what are the opinions regarding second coming of Jesus in Islam ?