Flight Check

Best Airline: DTW to SJU

Detroit to San Juan — airline reliability comparison

Spirit Airlines is the most reliable airline on the DTW to SJU route with a 85% on-time rate, compared to Frontier Airlines at 47%. Based on 190 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

Spirit Airlines85%
Delta Air Lines81%
Frontier Airlines47%

DTW to SJU Airline Comparison

AirlineOn-Time %Cancel %Avg DelayFlights
Spirit AirlinesNKBest85%0.0%49m190
Delta Air LinesDL81%0.2%47m1,106
Frontier AirlinesF9Worst47%0.0%59m32

Route Overview

81%
Overall On-Time
49m
Avg Delay
0.2%
Cancel Rate
1,336
Total Flights
DTW to SJU Route DetailsReturn: SJU to DTW
DTW AirportSJU Airport

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