Alaska Airlines IAD to SEA on-time performance
Alaska Airlines nonstop flights from Washington to Seattle · Aug 2025 – Jul 2026
On-time arrivals
75%
arrived < 15 min late
Cancelled
1.2%
10 flights
Avg arrival delay
13 min
49 min when late
Rank on route
#3 of 3
route average 78% on time
Key facts
- Alaska Airlines flights on IAD to SEA arrived on time 75% of the time in Aug 2025 – Jul 2026.
- 1.2% were cancelled, and 6% arrived an hour or more late.
- That ranks #3 of 3 airlines on this route, which averaged 78% on time overall.
- The largest source of delay minutes was air traffic control & airport congestion (37%).
On-time trend by month
Why this airline's flights were late
- Air traffic control & airport congestion37%
- Late-arriving aircraft26%
- Airline (crew, maintenance, cleaning, fueling)24%
- Extreme weather11%
- Security2%
Other airlines on IAD to SEA
- United Airlines81% on time · 13 min avg delay
- Delta Air Lines77% on time · 23 min avg delay
Full IAD to SEA comparison →
Alaska Airlines on-time record across all routes →
835 Alaska Airlines flights tracked on this route; 10 cancelled, 1 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.