Flight Check

Best Airline: BUF to DEN

Buffalo to Denver — airline reliability comparison

United Airlines is the most reliable airline on the BUF to DEN route with a 85% on-time rate, compared to Frontier Airlines at 71%. Based on 363 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 Airlines85%
Southwest Airlines78%
Frontier Airlines71%

BUF to DEN Airline Comparison

AirlineOn-Time %Cancel %Avg DelayFlights
United AirlinesUABest85%0.3%76m363
Southwest AirlinesWN78%0.8%41m974
Frontier AirlinesF9Worst71%1.2%64m217

Route Overview

79%
Overall On-Time
55m
Avg Delay
0.7%
Cancel Rate
1,623
Total Flights
BUF to DEN Route DetailsReturn: DEN to BUF
BUF AirportDEN Airport

Flying out of BUF? 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.