TSA Security Wait Times at ATL can vary based on passenger traffic, time of day, and travel seasons. Hartsfield-Jackson Atlanta International Airport is one of the busiest airports in the world, so peak hours such as early mornings, evenings, and holidays often see longer lines. Travelers are advised to arrive at least two hours before domestic flights and three hours before international departures. The airport offers multiple security checkpoints and TSA PreCheck lanes to help speed up screening. Planning ahead and checking real-time updates can ensure a smoother travel experience.