San Juan to Boston — airline reliability comparison
Delta Air Lines is the most reliable airline on the SJU to BOS route with a 85% on-time rate, compared to JetBlue Airways at 70%. Based on 1,385 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 |
|---|---|---|---|---|
| Delta Air LinesDLBest | 85% | 0.7% | 74m | 1,385 |
| Spirit AirlinesNK | 78% | 3.3% | 65m | 892 |
| Frontier AirlinesF9 | 73% | 1.8% | 46m | 214 |
| JetBlue AirwaysB6Worst | 70% | 1.8% | 89m | 4,858 |
Delays, TSA, weather, gates — we'll let you know if something matters.
Data last updated October 2026. Source: Bureau of Transportation Statistics.