Seattle, WA → Washington, DC flight delays
SEA → IAD · all airlines · 202 flights · May 2026 · source: US BTS
This route is delayed
14%of the time, by +37 min on average when it does.
This is history, not a promise — your specific flight could well be on time.
On-time rate
86%
Delayed 3h+
0%
Cancelled
0%
Avg when late
+37m
Best & worst day to fly
Most on-time
Tuesday
delayed 5%
Worst
Sunday
delayed 24%
Which airline is most punctual on SEA → IAD?
Alaskadelayed 13%
Deltadelayed 13%
Uniteddelayed 15%
Frequently asked
How often is the Seattle, WA to Washington, DC flight delayed?
About 14% of SEA → IAD flights arrive late (15+ minutes), by an average of 37 minutes when they do, based on 202 flights in May 2026.
Which airline is most punctual on SEA → IAD?
Alaska, delayed 13% of the time — the best of the 3 airlines flying this route.
What is the best day to fly SEA → IAD?
Tuesday is the most on-time (delayed 5%), while Sunday is the worst (delayed 24%).
Airport overviews