Southwest Airlines MCI to SEA on-time performance
Southwest Airlines nonstop flights from Kansas City to Seattle · Aug 2025 – Jul 2026
On-time arrivals
72%
arrived < 15 min late
Cancelled
0.0%
0 flights
Avg arrival delay
14 min
38 min when late
Rank on route
#3 of 3
route average 85% on time
Key facts
- Southwest Airlines flights on MCI to SEA arrived on time 72% of the time in Aug 2025 – Jul 2026.
- 0% were cancelled, and 6% arrived an hour or more late.
- That ranks #3 of 3 airlines on this route, which averaged 85% on time overall.
- The largest source of delay minutes was late-arriving aircraft (38%).
On-time trend by month
Why this airline's flights were late
- Late-arriving aircraft38%
- Air traffic control & airport congestion35%
- Airline (crew, maintenance, cleaning, fueling)27%
- Extreme weather0%
- Security0%
Other airlines on MCI to SEA
- Alaska Airlines85% on time · 11 min avg delay
- Delta Air Lines86% on time · 11 min avg delay
Full MCI to SEA comparison →
Southwest Airlines on-time record across all routes →
18 Southwest Airlines flights tracked on this route; 0 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.