Atlanta to San Juan — airline reliability comparison
Delta Air Lines is the most reliable airline on the ATL to SJU route with a 80% on-time rate, compared to Frontier Airlines at 56%. Based on 5,664 flights tracked.
This route involves high-congestion airports, which can affect reliability regardless of airline.
Source: Bureau of Transportation Statistics. Updated October 2026.| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| Delta Air LinesDLBest | 80% | 0.5% | 53m | 5,664 |
| Spirit AirlinesNK | 70% | 0.7% | 63m | 754 |
| Frontier AirlinesF9Worst | 56% | 2.0% | 82m | 1,072 |
Delays, TSA, weather, gates — we'll let you know if something matters.
Data last updated October 2026. Source: Bureau of Transportation Statistics.