Alaska Airlines SEA to PHL on-time performance
Alaska Airlines nonstop flights from Seattle to Philadelphia · Aug 2025 – Jul 2026
On-time arrivals
81%
arrived < 15 min late
Cancelled
0.9%
6 flights
Avg arrival delay
10 min
44 min when late
Rank on route
#3 of 3
route average 82% on time
Key facts
- Alaska Airlines flights on SEA to PHL arrived on time 81% of the time in Aug 2025 – Jul 2026.
- 0.9% were cancelled, and 4% arrived an hour or more late.
- That ranks #3 of 3 airlines on this route, which averaged 82% on time overall.
- The largest source of delay minutes was airline (crew, maintenance, cleaning, fueling) (37%).
On-time trend by month
Why this airline's flights were late
- Airline (crew, maintenance, cleaning, fueling)37%
- Late-arriving aircraft30%
- Air traffic control & airport congestion22%
- Extreme weather11%
- Security0%
Other airlines on SEA to PHL
- American Airlines84% on time · 15 min avg delay
- Delta Air Lines84% on time · 8 min avg delay
Full SEA to PHL comparison →
Alaska Airlines on-time record across all routes →
657 Alaska Airlines flights tracked on this route; 6 cancelled, 4 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.