Southwest Airlines LAS to SEA on-time performance
Southwest Airlines nonstop flights from Las Vegas to Seattle · Aug 2025 – Jul 2026
On-time arrivals
72%
arrived < 15 min late
Cancelled
0.2%
2 flights
Avg arrival delay
14 min
44 min when late
Rank on route
#6 of 6
route average 82% on time
Key facts
- Southwest Airlines flights on LAS to SEA arrived on time 72% of the time in Aug 2025 – Jul 2026.
- 0.2% were cancelled, and 6% arrived an hour or more late.
- That ranks #6 of 6 airlines on this route, which averaged 82% 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)35%
- Air traffic control & airport congestion10%
- Extreme weather2%
- Security0%
Other airlines on LAS to SEA
- Alaska Airlines83% on time · 12 min avg delay
- Delta Air Lines88% on time · 12 min avg delay
- Frontier Airlines82% on time · 10 min avg delay
- Spirit Airlines75% on time · 16 min avg delay
- SkyWest Airlines86% on time · 9 min avg delay
Full LAS to SEA comparison →
Southwest Airlines on-time record across all routes →
977 Southwest Airlines flights tracked on this route; 2 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.