Flight Reliability
NK 581 · Spirit Airlines
Fort Lauderdale → Chicago (FLL–ORD)
0
Bring Snacks
WanderNerd Reliability Score
- 38%
- Arrive within 15 minutes
- 45 min
- Average arrival delay
- 9.4%
- Cancelled
- 27 min
- Median arrival delay
Based on 96 historical flights. Data through May 2026.
What the data says
The late departure is the smart one here.
NK 581 departing between 9 PM–12 AM arrived on time 55% of the time, versus 23% between 3–6 PM.
Sunday scaries are real for this one.
NK 581 arrived on time 54% of the time on Wednesdays and just 10% on Sundays. That gap is worth planning around.
Well behind the FLL–ORD route.
NK 581 arrived on time 38% of the time, versus 70% across the FLL–ORD route.
Well behind the Spirit Airlines network.
NK 581 arrived on time 38% of the time, versus 74% across the Spirit Airlines network.
The breakdown
- Mon31%(13 flights)
- Tue46%(13 flights)
- Wed54%(13 flights)
- Thu43%(14 flights)
- Fri46%(11 flights)
- Sat31%(13 flights)
- Sun10%(10 flights)
- 3–6 PM23%(30 flights)
- 6–9 PM35%(26 flights)
- 9 PM–12 AM55%(31 flights)
33%
Apr
Jan 55% → Apr 33% on time
| Month | On-time percentage | Flights |
|---|---|---|
| January 2026 | 55% | 22 |
| February 2026 | 44% | 27 |
| March 2026 | 19% | 26 |
| April 2026 | 33% | 12 |
- Departures on time
- 52%
- Diverted
- 0%
- Flights flown
- 87
- Months covered
- 4
Same route, other flights
Keep nerding
Based on 96 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.