Plan on getting to MIA 3 hours before an international flight and 2 hours for a domestic flight, though it's always worth checking with your airline and current traffic conditions. In a 2018 survey by Upgraded Points the Miami Airport security wait times were ranked as 3rd worst in the country so it might be wise to leave for the airport a little earlier than you might otherwise have done, especially around the weekend and during holidays.
Check above to view the current estimated MIA TSA wait times and PreCheck locations and lane openings. TSA PreCheck membership can lead to much shorter wait times at Miami Airport. To find out more about joining or renewing TSA PreCheck membership visit https://www.tsa.gov/precheck. Please note that CLEAR is also available at Miami Int'l.
As you can imagine there are an awful lot of overseas vacationers arriving at Miami Airport. A large number of flights arriving at the same time is often a big factor in determining how long it will take to get through the security lines. Another big factor is whether you have already been screened at a connecting airport or whether you are arriving in the US at MIA.
For further information on Miami International Airport wait times, TSA security, bag checking, immigration, lost and found and more visit https://www.miami-airport.com/