Flight Check

Best Airline: ONT to LAS

Ontario to Las Vegas — airline reliability comparison

Southwest Airlines is the most reliable airline on the ONT to LAS route with a 79% on-time rate, compared to Frontier Airlines at 75%. Based on 6,656 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 Airlines79%
Frontier Airlines75%

ONT to LAS Airline Comparison

AirlineOn-Time %Cancel %Avg DelayFlights
Southwest AirlinesWNBest79%0.7%55m6,656
Frontier AirlinesF9Worst75%1.4%95m2,783

Route Overview

78%
Overall On-Time
69m
Avg Delay
0.9%
Cancel Rate
9,439
Total Flights
ONT to LAS Route DetailsReturn: LAS to ONT
ONT AirportLAS Airport

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