Delta Air Lines SEA to SFO on-time performance
Delta Air Lines nonstop flights from Seattle to San Francisco · Aug 2025 – Jul 2026
On-time arrivals
63%
arrived < 15 min late
Cancelled
1.7%
16 flights
Avg arrival delay
23 min
57 min when late
Rank on route
#3 of 5
route average 62% on time
Key facts
- Delta Air Lines flights on SEA to SFO arrived on time 63% of the time in Aug 2025 – Jul 2026.
- 1.7% were cancelled, and 11% arrived an hour or more late.
- That ranks #3 of 5 airlines on this route, which averaged 62% on time overall.
- The largest source of delay minutes was air traffic control & airport congestion (45%).
On-time trend by month
Why this airline's flights were late
- Air traffic control & airport congestion45%
- Airline (crew, maintenance, cleaning, fueling)38%
- Late-arriving aircraft15%
- Extreme weather2%
- Security0%
Other airlines on SEA to SFO
- Alaska Airlines58% on time · 24 min avg delay
- United Airlines62% on time · 27 min avg delay
- SkyWest Airlines72% on time · 16 min avg delay
- Southwest Airlines100% on time · 0 min avg delay
Full SEA to SFO comparison →
Delta Air Lines on-time record across all routes →
954 Delta Air Lines flights tracked on this route; 16 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.