Flight Check

Best Airline: DEN to MIA

Denver to Miami — airline reliability comparison

Spirit Airlines is the most reliable airline on the DEN to MIA route with a 81% on-time rate, compared to Southwest Airlines at 67%. Based on 336 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

Spirit Airlines81%
American Airlines76%
United Airlines72%
Frontier Airlines68%
Southwest Airlines67%

DEN to MIA Airline Comparison

AirlineOn-Time %Cancel %Avg DelayFlights
Spirit AirlinesNKBest81%1.8%73m336
American AirlinesAA76%0.9%95m3,071
United AirlinesUA72%0.6%59m3,071
Frontier AirlinesF968%0.9%63m1,360
Southwest AirlinesWNWorst67%0.6%58m966

Route Overview

72%
Overall On-Time
73m
Avg Delay
0.8%
Cancel Rate
8,877
Total Flights
DEN to MIA Route DetailsReturn: MIA to DEN
DEN AirportMIA Airport

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