According to TSA peak times: Saturdays between 9am and Noon as well as 3pm to 5am Sundays between 9am and 3pm, and 7pm to 5am Mondays between 9am and 2pm as well as 7pm to 4am Tuesdays between 9am and 2pm, and 6pm to 5am Wednesdays between 9am and 3pm, and 6pm to 5am Thursdays between 9am and 3pm, and 8pm to 4am Fridays between 9am to 2pm as well as 6pm to 4amFind more details on how to avoid long wait times at ATL here: https://patch.com/georgia/atlanta/how-avoid-security-wait-times-atlanta-hartsield-airport