Is there a minimum number of AAdvantage® miles that I must purchase? orderAAmiles Admin April 24, 2012 22:21 Updated Yes, the minimum number of miles that must be purchased is 250,000 miles. Related articles How much do AAdvantage® miles cost? What happens when my campaign has expired? If I wish to purchase a larger block of miles who can I contact about discounted pricing? Can international companies purchase AAdvantage miles? Comments 0 comments Article is closed for comments.