United Airlines SEA to IAD on-time performance
United Airlines nonstop flights from Seattle to Washington · Aug 2025 – Jul 2026
On-time arrivals
89%
arrived < 15 min late
Cancelled
0.8%
5 flights
Avg arrival delay
10 min
83 min when late
Rank on route
#1 of 3
route average 83% on time
Key facts
- United Airlines flights on SEA to IAD arrived on time 89% of the time in Aug 2025 – Jul 2026.
- 0.8% were cancelled, and 4% arrived an hour or more late.
- That ranks #1 of 3 airlines on this route, which averaged 83% on time overall.
- The largest source of delay minutes was airline (crew, maintenance, cleaning, fueling) (43%).
On-time trend by month
Why this airline's flights were late
- Airline (crew, maintenance, cleaning, fueling)43%
- Late-arriving aircraft40%
- Air traffic control & airport congestion16%
- Extreme weather1%
- Security0%
Other airlines on SEA to IAD
- Alaska Airlines82% on time · 8 min avg delay
- Delta Air Lines76% on time · 19 min avg delay
Full SEA to IAD comparison →
United Airlines on-time record across all routes →
657 United Airlines flights tracked on this route; 5 cancelled, 3 diverted.
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. How we calculate this.