Flight Check

Best Airline: LAS to ONT

Las Vegas to Ontario — airline reliability comparison

Frontier Airlines is the most reliable airline on the LAS to ONT route with a 80% on-time rate, compared to Southwest Airlines at 76%. Based on 2,783 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

Frontier Airlines80%
Southwest Airlines76%

LAS to ONT Airline Comparison

AirlineOn-Time %Cancel %Avg DelayFlights
Frontier AirlinesF9Best80%1.0%72m2,783
Southwest AirlinesWNWorst76%0.7%50m6,623

Route Overview

77%
Overall On-Time
56m
Avg Delay
0.8%
Cancel Rate
9,406
Total Flights
LAS to ONT Route DetailsReturn: ONT to LAS
LAS AirportONT Airport

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