Flight Check

Best Airline: SEA to ATL

Seattle to Atlanta — airline reliability comparison

Delta Air Lines is the most reliable airline on the SEA to ATL route with a 84% on-time rate, compared to Alaska Airlines at 78%. Based on 8,533 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%
Alaska Airlines78%

SEA to ATL Airline Comparison

AirlineOn-Time %Cancel %Avg DelayFlights
Delta Air LinesDLBest84%0.7%80m8,533
Alaska AirlinesASWorst78%0.9%42m3,637

Route Overview

82%
Overall On-Time
69m
Avg Delay
0.7%
Cancel Rate
12,170
Total Flights
SEA to ATL Route DetailsReturn: ATL to SEA
SEA AirportATL Airport

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