Flight Check

Best Airline: IAD to BOS

Washington to Boston — airline reliability comparison

United Airlines is the most reliable airline on the IAD to BOS route with a 79% on-time rate, compared to Republic Airways at 76%. Based on 5,272 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 Airlines79%
Republic Airways76%

IAD to BOS Airline Comparison

AirlineOn-Time %Cancel %Avg DelayFlights
United AirlinesUABest79%1.6%71m5,272
Republic AirwaysYXWorst76%14.8%64m54

Route Overview

79%
Overall On-Time
71m
Avg Delay
1.7%
Cancel Rate
5,338
Total Flights
IAD to BOS Route DetailsReturn: BOS to IAD
IAD AirportBOS Airport

Flying out of IAD? 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.