Flight Check

Best Airline: IAD to ATL

Washington to Atlanta — airline reliability comparison

Southwest Airlines is the most reliable airline on the IAD to ATL route with a 86% on-time rate, compared to Frontier Airlines at 65%. Based on 350 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

Southwest Airlines86%
Delta Air Lines84%
United Airlines80%
Republic Airways77%
Frontier Airlines65%

IAD to ATL Airline Comparison

AirlineOn-Time %Cancel %Avg DelayFlights
Southwest AirlinesWNBest86%0.6%47m350
Delta Air LinesDL84%1.6%97m7,545
United AirlinesUA80%0.9%73m3,986
Republic AirwaysYX77%3.3%37m69
Frontier AirlinesF9Worst65%2.9%86m961

Route Overview

81%
Overall On-Time
85m
Avg Delay
1.5%
Cancel Rate
12,980
Total Flights
IAD to ATL Route DetailsReturn: ATL to IAD
IAD AirportATL Airport

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