Flight Check

Best Airline: SFO to SEA

San Francisco to Seattle — airline reliability comparison

Delta Air Lines is the most reliable airline on the SFO to SEA route with a 86% on-time rate, compared to Alaska Airlines at 74%. Based on 3,277 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 Lines86%
United Airlines79%
SkyWest Airlines77%
Alaska Airlines74%

SFO to SEA Airline Comparison

AirlineOn-Time %Cancel %Avg DelayFlights
Delta Air LinesDLBest86%1.0%89m3,277
United AirlinesUA79%0.8%61m6,739
SkyWest AirlinesOO77%0.7%58m3,792
Alaska AirlinesASWorst74%1.7%56m10,241

Route Overview

77%
Overall On-Time
60m
Avg Delay
1.1%
Cancel Rate
24,052
Total Flights
SFO to SEA Route DetailsReturn: SEA to SFO
SFO AirportSEA Airport

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