Flight Check

Best Airline: SEA to BOS

Seattle to Boston — airline reliability comparison

Delta Air Lines is the most reliable airline on the SEA to BOS route with a 83% on-time rate, compared to JetBlue Airways at 63%. 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 Lines83%
Alaska Airlines74%
JetBlue Airways63%

SEA to BOS Airline Comparison

AirlineOn-Time %Cancel %Avg DelayFlights
Delta Air LinesDLBest83%1.0%66m3,454
Alaska AirlinesAS74%0.9%50m4,288
JetBlue AirwaysB6Worst63%1.2%83m1,405

Route Overview

75%
Overall On-Time
62m
Avg Delay
0.9%
Cancel Rate
9,147
Total Flights
SEA to BOS Route DetailsReturn: BOS to SEA
SEA AirportBOS Airport

Flying out of SEA? We'll brief you.

Delays, TSA, weather, gates — we'll let you know if something matters.

Free. No account needed.

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