Alaska Airlines PHL to SEA on-time performance
Alaska Airlines nonstop flights from Philadelphia to Seattle · Aug 2025 – Jul 2026
On-time arrivals
68%
arrived < 15 min late
Cancelled
1.7%
11 flights
Avg arrival delay
17 min
50 min when late
Rank on route
#3 of 3
route average 70% on time
Key facts
- Alaska Airlines flights on PHL to SEA arrived on time 68% of the time in Aug 2025 – Jul 2026.
- 1.7% were cancelled, and 7% arrived an hour or more late.
- That ranks #3 of 3 airlines on this route, which averaged 70% on time overall.
- The largest source of delay minutes was air traffic control & airport congestion (50%).
On-time trend by month
Why this airline's flights were late
- Air traffic control & airport congestion50%
- Late-arriving aircraft28%
- Airline (crew, maintenance, cleaning, fueling)19%
- Extreme weather3%
- Security0%
Other airlines on PHL to SEA
- American Airlines72% on time · 15 min avg delay
- Delta Air Lines69% on time · 26 min avg delay
Full PHL to SEA comparison →
Alaska Airlines on-time record across all routes →
657 Alaska Airlines flights tracked on this route; 11 cancelled, 0 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.