Flight Check

Best Airline: BOS to SEA

Boston to Seattle — airline reliability comparison

Delta Air Lines is the most reliable airline on the BOS to SEA route with a 80% on-time rate, compared to JetBlue Airways at 74%. Based on 3,454 flights tracked.

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

Source: Bureau of Transportation Statistics. Updated October 2026.

On-Time Rate by Airline

Delta Air Lines80%
Alaska Airlines77%
JetBlue Airways74%

BOS to SEA Airline Comparison

AirlineOn-Time %Cancel %Avg DelayFlights
Delta Air LinesDLBest80%1.1%67m3,454
Alaska AirlinesAS77%1.1%53m4,291
JetBlue AirwaysB6Worst74%0.6%71m1,405

Route Overview

77%
Overall On-Time
64m
Avg Delay
0.9%
Cancel Rate
9,150
Total Flights
BOS to SEA Route DetailsReturn: SEA to BOS
BOS AirportSEA Airport

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