When to arrive at the airport

The TSA does not publish a single “arrive X hours early” rule. Its own guidance is to check with your airline, because the right cushion varies by airport and date, and to leave time for parking or the shuttle, check-in and bag drop, and the security line.

That familiar guidance comes from the airlines, not the TSA. United, for example, recommends checking in at least two hours before a domestic flight and three hours before an international one. Treat it as a sensible default, then adjust for a big hub, a busy travel day, or checked bags.

With TSA PreCheck you generally keep your shoes, belt, and a light jacket on, and leave your laptop and compliant liquids in your bag. TSA targets under 10 minutes for PreCheck lanes, versus under 30 minutes for standard screening — though actual waits depend on the airport and time of day.

Security lines tend to peak in the early morning and again in the mid-afternoon, and around holidays — Thanksgiving (the Tuesday and Wednesday before, and the Sunday after), the winter holidays, summer, and spring break. The myTSA app and TSA’s published passenger-volume data can show you expected crowds for your airport and day.

Being inside the terminal is not the same as making your flight. Airlines set their own bag-drop and boarding cutoff times, and they vary by airport and destination — commonly tens of minutes before departure. Miss the cutoff and you can lose the seat even if you are standing at the gate. Confirm your airline’s specific cutoffs before you cut it close.