Flight Check

Best Airline: EWR to SEA

Newark to Seattle — airline reliability comparison

United Airlines is the most reliable airline on the EWR to SEA route with a 77% on-time rate, compared to Alaska Airlines at 75%. Based on 3,563 flights tracked.

This route involves weather-prone airports and high-congestion airports, which can affect reliability regardless of airline.

Source: Bureau of Transportation Statistics. Updated October 2026.

On-Time Rate by Airline

United Airlines77%
Alaska Airlines75%

EWR to SEA Airline Comparison

AirlineOn-Time %Cancel %Avg DelayFlights
United AirlinesUABest77%1.3%67m3,563
Alaska AirlinesASWorst75%2.6%70m3,816

Route Overview

75%
Overall On-Time
71m
Avg Delay
2%
Cancel Rate
7,379
Total Flights
EWR to SEA Route DetailsReturn: SEA to EWR
EWR AirportSEA Airport

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