Alaska Airlines SEA to DEN on-time performance
Alaska Airlines nonstop flights from Seattle to Denver · Aug 2025 – Jul 2026
On-time arrivals
78%
arrived < 15 min late
Cancelled
0.7%
11 flights
Avg arrival delay
12 min
47 min when late
Rank on route
#3 of 6
route average 78% on time
Key facts
- Alaska Airlines flights on SEA to DEN arrived on time 78% of the time in Aug 2025 – Jul 2026.
- 0.7% were cancelled, and 5% arrived an hour or more late.
- That ranks #3 of 6 airlines on this route, which averaged 78% on time overall.
- The largest source of delay minutes was late-arriving aircraft (39%).
On-time trend by month
Why this airline's flights were late
- Late-arriving aircraft39%
- Air traffic control & airport congestion31%
- Airline (crew, maintenance, cleaning, fueling)25%
- Extreme weather6%
- Security0%
Other airlines on SEA to DEN
- United Airlines88% on time · 9 min avg delay
- Southwest Airlines68% on time · 17 min avg delay
- Delta Air Lines73% on time · 17 min avg delay
- Frontier Airlines77% on time · 15 min avg delay
- SkyWest Airlines85% on time · 10 min avg delay
Full SEA to DEN comparison →
Alaska Airlines on-time record across all routes →
1,551 Alaska Airlines flights tracked on this route; 11 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.