Delta Air Lines PHL to SEA on-time performance
Delta Air Lines nonstop flights from Philadelphia to Seattle · Aug 2025 – Jul 2026
On-time arrivals
69%
arrived < 15 min late
Cancelled
0.0%
0 flights
Avg arrival delay
26 min
77 min when late
Rank on route
#2 of 3
route average 70% on time
Key facts
- Delta Air Lines flights on PHL to SEA arrived on time 69% of the time in Aug 2025 – Jul 2026.
- 0% were cancelled, and 7% arrived an hour or more late.
- That ranks #2 of 3 airlines on this route, which averaged 70% on time overall.
- The largest source of delay minutes was extreme weather (45%).
On-time trend by month
Why this airline's flights were late
- Extreme weather45%
- Air traffic control & airport congestion32%
- Airline (crew, maintenance, cleaning, fueling)16%
- Late-arriving aircraft7%
- Security0%
Other airlines on PHL to SEA
- Alaska Airlines68% on time · 17 min avg delay
- American Airlines72% on time · 15 min avg delay
Full PHL to SEA comparison →
Delta Air Lines on-time record across all routes →
82 Delta Air Lines flights tracked on this route; 0 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.