United Airlines SEA to SFO on-time performance
United Airlines nonstop flights from Seattle to San Francisco · Aug 2025 – Jul 2026
On-time arrivals
62%
arrived < 15 min late
Cancelled
0.8%
16 flights
Avg arrival delay
27 min
69 min when late
Rank on route
#4 of 5
route average 62% on time
Key facts
- United Airlines flights on SEA to SFO arrived on time 62% of the time in Aug 2025 – Jul 2026.
- 0.8% were cancelled, and 14% arrived an hour or more late.
- That ranks #4 of 5 airlines on this route, which averaged 62% on time overall.
- The largest source of delay minutes was air traffic control & airport congestion (61%).
On-time trend by month
Why this airline's flights were late
- Air traffic control & airport congestion61%
- Late-arriving aircraft21%
- Airline (crew, maintenance, cleaning, fueling)17%
- Extreme weather1%
- Security0%
Other airlines on SEA to SFO
- Alaska Airlines58% on time · 24 min avg delay
- SkyWest Airlines72% on time · 16 min avg delay
- Delta Air Lines63% on time · 23 min avg delay
- Southwest Airlines100% on time · 0 min avg delay
Full SEA to SFO comparison →
United Airlines on-time record across all routes →
2,052 United Airlines flights tracked on this route; 16 cancelled, 3 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.