Flight Check

Best Airline: DFW to SEA

Dallas to Seattle — airline reliability comparison

Delta Air Lines is the most reliable airline on the DFW to SEA route with a 82% on-time rate, compared to Frontier Airlines at 66%. Based on 1,453 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 Lines82%
Alaska Airlines74%
American Airlines72%
Frontier Airlines66%

DFW to SEA Airline Comparison

AirlineOn-Time %Cancel %Avg DelayFlights
Delta Air LinesDLBest82%1.5%91m1,453
Alaska AirlinesAS74%1.7%56m6,323
American AirlinesAA72%2.0%69m9,485
Frontier AirlinesF9Worst66%1.7%39m138

Route Overview

73%
Overall On-Time
66m
Avg Delay
1.8%
Cancel Rate
17,450
Total Flights
DFW to SEA Route DetailsReturn: SEA to DFW
DFW AirportSEA Airport

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