Washington Dulles International (IAD) has an on-time arrival rate of about 78%. When flights are delayed, the average wait is around 49 minutes. The most common reason for delays here is air traffic and busy airspace. Roughly 2% of flights are cancelled. The typical taxi-out time from gate to takeoff is about 14 minutes. TSA security wait is currently About 13-19 minutes right now. The fastest time through security is 4 AM (about 3 min). The busiest period is 6 PM (19-25 minutes).
Source: Bureau of Transportation Statistics, FAA NASSTATUS. Updated March 2026.Last updated: March 2026