Flight Check

Best Airline: BOS to IAD

Boston to Washington — airline reliability comparison

United Airlines is the most reliable airline on the BOS to IAD route with a 84% on-time rate, compared to Republic Airways at 80%. Based on 5,268 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

United Airlines84%
Republic Airways80%

BOS to IAD Airline Comparison

AirlineOn-Time %Cancel %Avg DelayFlights
United AirlinesUABest84%1.5%73m5,268
Republic AirwaysYXWorst80%14.8%184m54

Route Overview

84%
Overall On-Time
74m
Avg Delay
1.6%
Cancel Rate
5,337
Total Flights
BOS to IAD Route DetailsReturn: IAD to BOS
BOS AirportIAD Airport

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