He wants to leave Makkah then come back to do the farewell tawaaf when the crowding is less severe
Question

                Is it permissible for those who live in Jeddah to omit the farewell tawaaf and then come back to Makkah and do it after the crowding is less severe?.
Praise be to Allah.
    It is not permissible for any pilgrim to leave Makkah before 
    performing the farewell tawaaf. 

    Shaykh Ibn ‘Uthaymeen (may Allaah have mercy on him) was 
    asked: Is it acceptable for those who live in Jeddah to leave Mina and go to 
    Jeddah without performing the farewell tawaaf, then come back a few days 
    later to perform the farewell tawaaf? 

    He replied: 

    It is not permissible for the people of Jeddah or anyone else 
    to go back to their cities before performing the farewell tawaaf, then come 
    back to Makkah when the crowding has become less severe. They should not 
    leave Makkah until they have performed the farewell tawaaf, because the 
    Prophet  (peace and blessings of Allaah be upon him) said: “No one of 
    you should leave until the last thing he has done is to circumambulate the 
    House.” And Ibn ‘Abbaas said: The people used to depart from many locations 
    (within Makkah), but the Prophet  (peace and blessings of Allaah be upon 
    him) said: “No one of you should leave until the last thing he has done is 
    to circumambulate the House.” 

    Majmoo’ Fataawa Ibn ‘Uthaymeen, 
    23/353. 

    Even if he comes back after that to perform the farewell 
    tawaaf, it will be of no benefit to him. Shaykh Ibn ‘Uthaymeen said: 
If he leaves Makkah 
    heading for Jeddah, and reaches Jeddah, then even if he performs it (the 
    farewell tawaaf) it will be of no benefit to him, because he left, so how 
    can it benefit him after he has left? 

    Majmoo’ Fataawa Ibn ‘Uthaymeen,  23/353.