Southwest Airlines is the most reliable airline on the ISP to MIA route with a 80% on-time rate. Based on 241 flights tracked.
Source: Bureau of Transportation Statistics. Updated October 2026.Best Airline: ISP to MIA
Islip to Miami — airline reliability comparison
On-Time Rate by Airline
Southwest Airlines80%
ISP to MIA Airline Comparison
| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| Southwest AirlinesWNBest | 80% | 0.7% | 61m | 241 |
Route Overview
79%
Overall On-Time
67m
Avg Delay
0.4%
Cancel Rate
241
Total Flights
Flying out of ISP? We'll brief you.
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Data last updated October 2026. Source: Bureau of Transportation Statistics.