Flight Check

Best Airline: SEA to SFO

Seattle to San Francisco — airline reliability comparison

SkyWest Airlines is the most reliable airline on the SEA to SFO route with a 75% on-time rate, compared to Alaska Airlines at 67%. Based on 3,784 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

SkyWest Airlines75%
Delta Air Lines74%
United Airlines73%
Alaska Airlines67%

SEA to SFO Airline Comparison

AirlineOn-Time %Cancel %Avg DelayFlights
SkyWest AirlinesOOBest75%0.6%54m3,784
Delta Air LinesDL74%1.1%64m3,274
United AirlinesUA73%0.8%75m6,740
Alaska AirlinesASWorst67%1.4%52m10,255

Route Overview

70%
Overall On-Time
59m
Avg Delay
1%
Cancel Rate
24,057
Total Flights
SEA to SFO Route DetailsReturn: SFO to SEA
SEA AirportSFO Airport

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