Las Vegas to Seattle — airline reliability comparison
Delta Air Lines is the most reliable airline on the LAS to SEA route with a 87% on-time rate, compared to Southwest Airlines at 72%. Based on 6,280 flights tracked.
This route involves high-congestion airports, which can affect reliability regardless of airline.
Source: Bureau of Transportation Statistics. Updated October 2026.| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| Delta Air LinesDLBest | 87% | 0.6% | 78m | 6,280 |
| Spirit AirlinesNK | 81% | 0.9% | 60m | 2,086 |
| Alaska AirlinesAS | 80% | 1.2% | 66m | 9,685 |
| Frontier AirlinesF9 | 78% | 1.4% | 57m | 1,066 |
| SkyWest AirlinesOO | 77% | 0.0% | 62m | 31 |
| Southwest AirlinesWNWorst | 72% | 0.3% | 47m | 3,458 |
Delays, TSA, weather, gates — we'll let you know if something matters.
Data last updated October 2026. Source: Bureau of Transportation Statistics.