United Airlines SFO to SEA on-time performance
United Airlines nonstop flights from San Francisco to Seattle · Aug 2025 – Jul 2026
On-time arrivals
75%
arrived < 15 min late
Cancelled
0.4%
8 flights
Avg arrival delay
15 min
58 min when late
Rank on route
#3 of 5
route average 73% on time
Key facts
- United Airlines flights on SFO to SEA arrived on time 75% of the time in Aug 2025 – Jul 2026.
- 0.4% were cancelled, and 7% arrived an hour or more late.
- That ranks #3 of 5 airlines on this route, which averaged 73% on time overall.
- The largest source of delay minutes was late-arriving aircraft (53%).
On-time trend by month
Why this airline's flights were late
- Late-arriving aircraft53%
- Airline (crew, maintenance, cleaning, fueling)28%
- Air traffic control & airport congestion18%
- Extreme weather1%
- Security0%
Other airlines on SFO to SEA
- Alaska Airlines70% on time · 18 min avg delay
- SkyWest Airlines70% on time · 16 min avg delay
- Delta Air Lines81% on time · 15 min avg delay
- Southwest Airlines100% on time · 3 min avg delay
Full SFO to SEA comparison →
United Airlines on-time record across all routes →
2,053 United Airlines flights tracked on this route; 8 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.