Flight Check

Best Airline: ATL to SEA

Atlanta to Seattle — airline reliability comparison

Delta Air Lines is the most reliable airline on the ATL to SEA route with a 83% on-time rate, compared to Alaska Airlines at 77%. Based on 8,535 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 Lines83%
Alaska Airlines77%

ATL to SEA Airline Comparison

AirlineOn-Time %Cancel %Avg DelayFlights
Delta Air LinesDLBest83%0.6%55m8,535
Alaska AirlinesASWorst77%1.3%57m3,637

Route Overview

81%
Overall On-Time
57m
Avg Delay
0.8%
Cancel Rate
12,172
Total Flights
ATL to SEA Route DetailsReturn: SEA to ATL
ATL AirportSEA Airport

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