Flight Reliability
NK 257 · Spirit Airlines
Raleigh–Durham → Newark (RDU–EWR)81% of its flights flew this route. The rest (FLL–ATL) are included in these numbers.
- 50%
- Arrive within 15 minutes
- 34 min
- Average arrival delay
- 9.1%
- Cancelled
- 12 min
- Median arrival delay
Based on 77 historical flights. Data through May 2026.
What the data says
Morning flights do better here.
NK 257 departing between 6–9 AM arrived on time 87% of the time, versus 40% between 6–9 PM.
Saturdays have been rough.
NK 257 arrived on time 80% of the time on Thursdays and just 40% on Saturdays. That gap is worth planning around.
Well behind the RDU–EWR route.
NK 257 arrived on time 50% of the time, versus 75% across the RDU–EWR route.
Well behind the Spirit Airlines network.
NK 257 arrived on time 50% of the time, versus 74% across the Spirit Airlines network.
The breakdown
- Mon40%(10 flights)
- Tue—(9 flights)
- Wed50%(10 flights)
- Thu80%(10 flights)
- Fri42%(12 flights)
- Sat40%(10 flights)
- Sun—(9 flights)
- 6–9 AM87%(15 flights)
- 6–9 PM40%(55 flights)
Feb 67% → Apr 63% on time
| Month | On-time percentage | Flights |
|---|---|---|
| February 2026 | 67% | 15 |
| March 2026 | 30% | 30 |
| April 2026 | 63% | 24 |
- Departures on time
- 47%
- Diverted
- 0%
- Flights flown
- 70
- Months covered
- 4
Same route, other flights
Keep nerding
Based on 77 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.