It is permissible
to give Zakah so that the poor Muslims can travel to perform the obligatory Hajj (Pilgrimage) because this generally comes under the purport of Allah's (Exalted be He) Saying:
...and for Allâh’s Cause
in the Ayah (Qur'anic verse) which specifies the categories of Zakah recipients.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.