Southwest Airlines FLL to ISP on-time performance
Southwest Airlines nonstop flights from Fort Lauderdale to Islip · Aug 2025 – Jul 2026
On-time arrivals
33%
arrived < 15 min late
Cancelled
0.0%
0 flights
Avg arrival delay
12 min
19 min when late
Rank on route
#3 of 3
route average 71% on time
Key facts
- Southwest Airlines flights on FLL to ISP arrived on time 33% of the time in Aug 2025 – Jul 2026.
- 0% were cancelled, and 0% arrived an hour or more late.
- That ranks #3 of 3 airlines on this route, which averaged 71% on time overall.
- The largest source of delay minutes was airline (crew, maintenance, cleaning, fueling) (57%).
On-time trend by month
Monthly trend appears once two or more months of data are available.
Why this airline's flights were late
- Airline (crew, maintenance, cleaning, fueling)57%
- Late-arriving aircraft32%
- Air traffic control & airport congestion11%
- Extreme weather0%
- Security0%
Other airlines on FLL to ISP
- JetBlue73% on time · 19 min avg delay
- Frontier Airlines44% on time · 50 min avg delay
Full FLL to ISP comparison →
Southwest Airlines on-time record across all routes →
3 Southwest Airlines flights tracked on this route; 0 cancelled, 0 diverted.
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. How we calculate this.