San Juan to Detroit — airline reliability comparison
Spirit Airlines is the most reliable airline on the SJU to DTW route with a 87% on-time rate, compared to Frontier Airlines at 59%. Based on 181 flights tracked.
This route involves weather-prone airports, which can affect reliability regardless of airline.
Source: Bureau of Transportation Statistics. Updated October 2026.| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| Spirit AirlinesNKBest | 87% | 0.5% | 66m | 181 |
| Delta Air LinesDL | 84% | 0.6% | 60m | 1,106 |
| Frontier AirlinesF9Worst | 59% | 2.9% | 62m | 32 |
Delays, TSA, weather, gates — we'll let you know if something matters.
Data last updated October 2026. Source: Bureau of Transportation Statistics.