Flight Check

Best Airline: STL to LAS

St. Louis to Las Vegas — airline reliability comparison

Southwest Airlines is the most reliable airline on the STL to LAS route with a 78% on-time rate, compared to Spirit Airlines at 71%. Based on 6,045 flights tracked.

This route involves high-congestion airports, which can affect reliability regardless of airline.

Source: Bureau of Transportation Statistics. Updated October 2026.

On-Time Rate by Airline

Southwest Airlines78%
Frontier Airlines74%
Spirit Airlines71%

STL to LAS Airline Comparison

AirlineOn-Time %Cancel %Avg DelayFlights
Southwest AirlinesWNBest78%0.6%54m6,045
Frontier AirlinesF974%2.5%101m1,060
Spirit AirlinesNKWorst71%2.6%73m240

Route Overview

78%
Overall On-Time
62m
Avg Delay
0.9%
Cancel Rate
7,379
Total Flights
STL to LAS Route DetailsReturn: LAS to STL
STL AirportLAS Airport

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Data last updated October 2026. Source: Bureau of Transportation Statistics.