DC Airports: security waits over the last four weeks
This page tracks the TSA checkpoints at Ronald Reagan Washington National and Washington Dulles International. The board above is live. Below is what the last 28 days of readings say about each airport, so you can judge whether today is normal. Of the airports with enough data, IAD has had the shortest standard-lane waits (5 minutes on average) and DCA the longest (5 minutes).
From October 13 to November 9 we logged 350,637 security checkpoint readings at Ronald Reagan Washington National. The standard lane averaged 5 minutes, and TSA PreCheck averaged 5 minutes. 98% of standard-lane readings were 10 minutes or less, and none were over half an hour.
Busiest around 6 AM (6 minutes), quietest around midnight (4 minutes). See each of its 3 terminals on the airport page.
From October 13 to November 9 we logged 27,415 security checkpoint readings at Washington Dulles International. The standard lane averaged 5 minutes. 100% of standard-lane readings were 10 minutes or less, and none were over half an hour.
Busiest around 9 PM (5 minutes), quietest around 1 AM (5 minutes).
Where these numbers come from
Each airport publishes its own checkpoint wait estimates. This site reads them every minute and keeps every reading. Closed lanes are left out of the averages, and times are local to the airport. The averages above cover the last 28 days and are recalculated every hour. The posted wait is the airport's estimate, not a timed measurement, so treat it as a guide.
The full archive is free to download as an open dataset, and the about page explains who runs the site and why.