Flight Check

Best Airline: ONT to ATL

Ontario to Atlanta — airline reliability comparison

Delta Air Lines is the most reliable airline on the ONT to ATL route with a 91% on-time rate, compared to Frontier Airlines at 84%. Based on 3,321 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

Delta Air Lines91%
Frontier Airlines84%

ONT to ATL Airline Comparison

AirlineOn-Time %Cancel %Avg DelayFlights
Delta Air LinesDLBest91%1.5%77m3,321
Frontier AirlinesF9Worst84%1.6%29m113

Route Overview

91%
Overall On-Time
75m
Avg Delay
1.5%
Cancel Rate
3,439
Total Flights
ONT to ATL Route DetailsReturn: ATL to ONT
ONT AirportATL Airport

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