SEA → IAD: cancellations & delays
Over Jan 2023 - Apr 2026, 1.1% of Seattle–Tacoma International Airport (SEA) to Washington Dulles International Airport (IAD) flights were cancelled and 19.2% arrived at least 15 minutes late, across 6,889 flights, flown by AS, UA, DL. Cancellations peak in January.
Check today's live SEA departures →Airport pages: Seattle–Tacoma International Airport (SEA) · Washington Dulles International Airport (IAD)
Rates are historical averages from U.S. DOT (BTS) on-time records; a specific flight's live estimate can differ with weather and the day's disruptions.