Flight Check

Best Airline: ATL to STL

Atlanta to St. Louis — airline reliability comparison

Delta Air Lines is the most reliable airline on the ATL to STL route with a 84% on-time rate, compared to Frontier Airlines at 70%. 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 Lines84%
Southwest Airlines79%
Frontier Airlines70%

ATL to STL Airline Comparison

AirlineOn-Time %Cancel %Avg DelayFlights
Delta Air LinesDLBest84%1.2%56m8,071
Southwest AirlinesWN79%0.7%52m4,280
Frontier AirlinesF9Worst70%1.5%60m236

Route Overview

82%
Overall On-Time
54m
Avg Delay
1%
Cancel Rate
12,596
Total Flights
ATL to STL Route DetailsReturn: STL to ATL
ATL AirportSTL Airport

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