SEA to IAD flight delays
Seattle, WA (SEA) Washington, VA (IAD) · 2,305 miles
198 flights · March 2025 – August 2026 · US Bureau of Transportation Statistics
83.16%
Arrived on time
Within 15 minutes of schedule
1.01%
Cancelled
Share of scheduled flights
41 min
When late, late by
Average across delayed arrivals
8 min
Delay per flight
Averaged over every flight flown
What the record says about this route
This route does better than its own airport. Departures from SEA overall run 8.8 points less punctual than this particular one — so whatever congestion SEA has, this route is largely escaping it.
Flights from Seattle to Washington keep to schedule more reliably than most. On a route this punctual the day you fly matters more than the airline you pick.
Every airline on SEA to IAD
Ranked by how many flights each one operated. A carrier with fewer than 100 flights in the period is listed but not graded.
| Airline | Flights | On time | Cancelled | Avg delay | Grade |
|---|---|---|---|---|---|
| Alaska Airlines | 90 | 80% | 0% | 40 min | — |
| United Airlines | 78 | 92.11% | 2.56% | 49 min | — |
| Delta Air Lines | 30 | 70% | 0% | 35 min | — |
The return leg
IAD to SEA Washington back to Seattle 78.46% on time COther routes from Seattle
Common questions
Are flights from Seattle to Washington usually delayed?
83.16% of flights on the SEA to IAD route arrived within 15 minutes of schedule, so roughly 2 in every ten arrived late. That is better than the average route in this record.
How often are SEA to IAD flights cancelled?
1.01% of scheduled flights did not operate — about 10 in every thousand. That is in the normal range.
When SEA to IAD flights are late, how late are they?
About 41 minutes on average across the flights that arrived more than 15 minutes behind schedule.
What these figures do and do not tell you
Everything on this page is counted from the flights that actually operated on SEA to IAD during March 2025 – August 2026, as reported by the airlines to the US Bureau of Transportation Statistics. "On time" is the federal definition: arriving at the gate within 15 minutes of the scheduled time.
A route's record is a description of the past, not a forecast. Weather, air traffic control and the aircraft's earlier flights that day drive most delays, and none of them are predictable from a historical rate. What the record does tell you is whether this route runs late more often than others, and which carrier on it has the better history — which is the part you can actually act on when you book.
Cancellations are counted separately from delays because they are a different problem for a traveller: a late flight still gets you there. How the grade is calculated →