Alaska Airlines SEA to STL on-time performance
Alaska Airlines nonstop flights from Seattle to St. Louis · Aug 2025 – Jul 2026
On-time arrivals
84%
arrived < 15 min late
Cancelled
0.3%
2 flights
Avg arrival delay
8 min
47 min when late
Rank on route
#1 of 2
route average 83% on time
Key facts
- Alaska Airlines flights on SEA to STL arrived on time 84% of the time in Aug 2025 – Jul 2026.
- 0.3% were cancelled, and 3% arrived an hour or more late.
- That ranks #1 of 2 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 aircraft37%
- Air traffic control & airport congestion16%
- Extreme weather4%
- Security0%
Other airlines on SEA to STL
- Southwest Airlines73% on time · 14 min avg delay
Full SEA to STL comparison →
Alaska Airlines on-time record across all routes →
780 Alaska Airlines flights tracked on this route; 2 cancelled, 2 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.