Flight Reliability
NK 577 · Spirit Airlines
Fort Lauderdale → Detroit (FLL–DTW)
10
Bring Snacks
WanderNerd Reliability Score
- 39%
- Arrive within 15 minutes
- 47 min
- Average arrival delay
- 3.4%
- Cancelled
- 33 min
- Median arrival delay
Based on 87 historical flights. Data through May 2026.
What the data says
The 3–6 PM departure wins.
NK 577 departing between 3–6 PM arrived on time 52% of the time, versus 32% between 6–9 PM.
Saturdays have been rough.
NK 577 arrived on time 50% of the time on Thursdays and just 15% on Saturdays. That gap is worth planning around.
Well behind the FLL–DTW route.
NK 577 arrived on time 39% of the time, versus 74% across the FLL–DTW route.
Well behind the Spirit Airlines network.
NK 577 arrived on time 39% of the time, versus 74% across the Spirit Airlines network.
The breakdown
- Mon39%(13 flights)
- Tue—(8 flights)
- Wed—(8 flights)
- Thu50%(14 flights)
- Fri50%(14 flights)
- Sat15%(13 flights)
- Sun23%(13 flights)
- 3–6 PM52%(27 flights)
- 6–9 PM32%(56 flights)
39%
Apr
Jan 39% → Apr 39% on time
| Month | On-time percentage | Flights |
|---|---|---|
| January 2026 | 39% | 18 |
| February 2026 | 46% | 22 |
| March 2026 | 33% | 30 |
| April 2026 | 39% | 13 |
- Departures on time
- 38%
- Diverted
- 1.1%
- Flights flown
- 83
- Months covered
- 4
Same route, other flights
Keep nerding
Based on 87 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.