Flight Check

Best Airline: ONT to ORD

Ontario to Chicago — airline reliability comparison

United Airlines is the most reliable airline on the ONT to ORD route with a 82% on-time rate. Based on 357 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 Airlines82%

ONT to ORD Airline Comparison

AirlineOn-Time %Cancel %Avg DelayFlights
United AirlinesUABest82%1.0%66m357

Route Overview

82%
Overall On-Time
67m
Avg Delay
1.1%
Cancel Rate
357
Total Flights
ONT to ORD Route DetailsReturn: ORD to ONT
ONT AirportORD Airport

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