SEA → LAS Southwest Airlines

Southwest Airlines · Seattle, WA to Las Vegas, NV · 976 flights, 2025-07-01 to 2026-06-30 · aggregated across 64 flight numbers

This route runs much more reliably at some times of day than others — 97% on-time departing 3–6am vs. 39% departing 6–9pm.
On-time arrival
70%
Median delay
+1 min
90th percentile
+46 min
Cancellation rate
1%

How on-time is Southwest Airlines from SEA to LAS?

Across every Southwest Airlines flight number on SEA → LAS (976 flights, 2025-07-01 to 2026-06-30), 70% arrived within 15 minutes of schedule. Median arrival delay +1 min; the worst 10% ran +46 min or later. 1% were cancelled.

Delay distribution

Arrival delay for completed flights (excludes cancellations and diversions).

ArrivalFlightsShare
Early / on-time68170%
16-30 min12713%
31-60 min10010%
61-120 min465%
2+ hrs172%

Performance by month

MonthFlightsOn-timeAvg delay
2025-079258%+20 min
2025-089258%+15 min
2025-098964%+11 min
2025-107971%+13 min
2025-117267%+16 min
2025-127580%+7 min
2026-016588%-2 min
2026-025784%+1 min
2026-038068%+11 min
2026-048878%+6 min
2026-059271%+13 min
2026-069068%+11 min

Performance by day of week

DayFlightsOn-time
Mon14370%
Tue14177%
Wed13475%
Thu14163%
Fri14464%
Sat12177%
Sun14767%

Based on US DOT Bureau of Transportation Statistics on-time data. Loading the full breakdown…