The Reward of ‘Umrah in Ramadaan is equivalent to the reward of Hajj.
It is narrated from Ibn ‘Abbaas (radiyAllaahu anhu) that The Messenger of Allaah (salallaahu ‘alaihi wa salam) said to a woman among the Ansaar, “What kept you from doing Hajj with us?” She said, “We only had two camels that we used for bringing water.” So her husband and son had gone for Hajj on one camel, and he left the other for them to use for bringing water.”
He (salallaahu ‘alaihi wa salam) said, “When Ramadaan comes, go for ‘Umrah, for ‘Umrah in Ramadaan is equivalent to Hajj.”
According to a report narrated by Muslim, “… is equivalent to doing Hajj with me.”
[Al-Bukhaari (1782) and Muslim (1256)]