Southwest Airlines SJC to SEA on-time performance
Southwest Airlines nonstop flights from San Jose to Seattle · Aug 2025 – Jul 2026
On-time arrivals
77%
arrived < 15 min late
Cancelled
0.0%
0 flights
Avg arrival delay
11 min
44 min when late
Rank on route
#5 of 5
route average 83% on time
Key facts
- Southwest Airlines flights on SJC to SEA arrived on time 77% of the time in Aug 2025 – Jul 2026.
- 0% were cancelled, and 5% arrived an hour or more late.
- That ranks #5 of 5 airlines on this route, which averaged 83% on time overall.
- The largest source of delay minutes was late-arriving aircraft (52%).
On-time trend by month
Why this airline's flights were late
- Late-arriving aircraft52%
- Airline (crew, maintenance, cleaning, fueling)24%
- Air traffic control & airport congestion23%
- Extreme weather1%
- Security0%
Other airlines on SJC to SEA
- Alaska Airlines81% on time · 10 min avg delay
- SkyWest Airlines89% on time · 8 min avg delay
- American Airlines100% on time · 5 min avg delay
- United Airlines100% on time · 0 min avg delay
Full SJC to SEA comparison →
Southwest Airlines on-time record across all routes →
906 Southwest Airlines 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.