Flight Check

Best Airline: DEN to BUF

Denver to Buffalo — airline reliability comparison

Frontier Airlines is the most reliable airline on the DEN to BUF route with a 76% on-time rate, compared to Southwest Airlines at 57%. Based on 217 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

Frontier Airlines76%
United Airlines67%
Southwest Airlines57%

DEN to BUF Airline Comparison

AirlineOn-Time %Cancel %Avg DelayFlights
Frontier AirlinesF9Best76%0.8%58m217
United AirlinesUA67%0.0%96m364
Southwest AirlinesWNWorst57%0.7%52m949

Route Overview

62%
Overall On-Time
60m
Avg Delay
0.5%
Cancel Rate
1,599
Total Flights
DEN to BUF Route DetailsReturn: BUF to DEN
DEN AirportBUF Airport

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