Flight Check

Best Airline: ORD to ONT

Chicago to Ontario — airline reliability comparison

United Airlines is the most reliable airline on the ORD to ONT route with a 61% on-time rate. Based on 356 flights tracked.

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

Source: Bureau of Transportation Statistics. Updated October 2026.

On-Time Rate by Airline

United Airlines61%

ORD to ONT Airline Comparison

AirlineOn-Time %Cancel %Avg DelayFlights
United AirlinesUABest61%1.3%73m356

Route Overview

60%
Overall On-Time
75m
Avg Delay
1.4%
Cancel Rate
356
Total Flights
ORD to ONT Route DetailsReturn: ONT to ORD
ORD AirportONT Airport

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