Flight Check

Best Airline: STL to ATL

St. Louis to Atlanta — airline reliability comparison

Delta Air Lines is the most reliable airline on the STL to ATL route with a 89% on-time rate, compared to Frontier Airlines at 64%. Based on 8,071 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 Lines89%
Southwest Airlines81%
Frontier Airlines64%

STL to ATL Airline Comparison

AirlineOn-Time %Cancel %Avg DelayFlights
Delta Air LinesDLBest89%1.2%75m8,071
Southwest AirlinesWN81%0.9%54m4,338
Frontier AirlinesF9Worst64%1.5%113m235

Route Overview

85%
Overall On-Time
67m
Avg Delay
1.1%
Cancel Rate
12,653
Total Flights
STL to ATL Route DetailsReturn: ATL to STL
STL AirportATL Airport

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