Delta Air Lines SFO to SEA on-time performance
Delta Air Lines nonstop flights from San Francisco to Seattle · Aug 2025 – Jul 2026
On-time arrivals
81%
arrived < 15 min late
Cancelled
1.7%
16 flights
Avg arrival delay
15 min
79 min when late
Rank on route
#2 of 5
route average 73% on time
Key facts
- Delta Air Lines flights on SFO to SEA arrived on time 81% of the time in Aug 2025 – Jul 2026.
- 1.7% were cancelled, and 8% arrived an hour or more late.
- That ranks #2 of 5 airlines on this route, which averaged 73% on time overall.
- The largest source of delay minutes was late-arriving aircraft (62%).
On-time trend by month
Why this airline's flights were late
- Late-arriving aircraft62%
- Airline (crew, maintenance, cleaning, fueling)29%
- Air traffic control & airport congestion9%
- Extreme weather0%
- Security0%
Other airlines on SFO to SEA
- Alaska Airlines70% on time · 18 min avg delay
- United Airlines75% on time · 15 min avg delay
- SkyWest Airlines70% on time · 16 min avg delay
- Southwest Airlines100% on time · 3 min avg delay
Full SFO to SEA comparison →
Delta Air Lines on-time record across all routes →
955 Delta Air Lines flights tracked on this route; 16 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.