Flight Check

Best Airline: DEN to BOS

Denver to Boston — airline reliability comparison

United Airlines is the most reliable airline on the DEN to BOS route with a 78% on-time rate, compared to Southwest Airlines at 61%. Based on 6,809 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 Airlines78%
Delta Air Lines76%
JetBlue Airways66%
Southwest Airlines61%

DEN to BOS Airline Comparison

AirlineOn-Time %Cancel %Avg DelayFlights
United AirlinesUABest78%1.2%66m6,809
Delta Air LinesDL76%0.8%55m1,454
JetBlue AirwaysB666%1.5%87m2,182
Southwest AirlinesWNWorst61%0.6%55m2,825

Route Overview

71%
Overall On-Time
68m
Avg Delay
1.1%
Cancel Rate
13,270
Total Flights
DEN to BOS Route DetailsReturn: BOS to DEN
DEN AirportBOS Airport

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