While both الحج and العمرة are الحجs to the Sacred المسجد (al-المسجد الحرام) in مكة involving الطواف and السعي, they differ significantly in their timing, scope, obligation, and spiritual weight. الحج is the 'greater الحج' and can only be performed during the specific days of ذو الحجة — the 8th through the 12th or 13th of the month. It involves a comprehensive set of rites spread across multiple locations: مكة, منى, عرفة, and مزدلفة. العمرة, often called the 'lesser الحج,' can be performed at any time throughout the year and consists of only four acts: entering الإحرام, performing الطواف around the الكعبة, performing السعي between الصفا and المروةh, and shaving or cutting the hair.
In terms of obligation, الحج is unanimously considered one of the five pillars of Islam and is واجب (فرض) once in a lifetime for every able Muslim. العمرة's obligation is debated: the Shafi'i and Hanbali schools consider it واجب once in a lifetime, while the Hanafi and Maliki schools consider it a strongly مستحب السنة (سنة mu'akkadah) but not واجب. Both الحجs begin with entering the state of الإحرام at the designated الميقات points and share the rites of الطواف and السعي, but الحج adds the critical rites of standing at عرفة, spending the night at مزدلفة, stoning the three pillars at منى, offering an animal sacrifice, and performing a farewell الطواف.
Practically, الحج typically requires 5-6 days to complete all rites (some الحجاج stay longer), while العمرة can be completed in as little as 2-4 hours for the actual rituals, though most الحجاج spend several days in مكة. الحج is significantly more expensive (ranging from $5,000 to $15,000+ depending on the country of origin and package) due to the fixed timing creating high demand, while العمرة is more affordable and flexible. Both are deeply rewarding spiritual experiences, and النبي (صلى الله عليه وسلم) said that 'العمرة to العمرة is an expiation for the sins between them, and an accepted الحج has no reward but Paradise.'