Flight Reliability
NK 1147 · Spirit Airlines
Houston → Miami (IAH–MIA)
67
Usually Fine
WanderNerd Reliability Score
- 69%
- Arrive within 15 minutes
- 15 min
- Average arrival delay
- 2.0%
- Cancelled
- 1 min
- Median arrival delay
Based on 50 historical flights. Data through May 2026.
What the data says
Morning-you made the right choice.
NK 1147 departing between 6–9 AM arrived on time 79% of the time, versus 60% between 6–9 PM.
Lagging the IAH–MIA route.
NK 1147 arrived on time 69% of the time, versus 78% across the IAH–MIA route.
A bit behind the Spirit Airlines network.
NK 1147 arrived on time 69% of the time, versus 74% across the Spirit Airlines network.
The breakdown
- Mon—(8 flights)
- Tue—(5 flights)
- Wed—(5 flights)
- Thu—(7 flights)
- Fri—(8 flights)
- Sat—(8 flights)
- Sun—(8 flights)
- 6–9 AM79%(29 flights)
- 12–3 PM—(5 flights)
- 6–9 PM60%(15 flights)
- Departures on time
- 67%
- Diverted
- 0%
- Flights flown
- 49
- Months covered
- 3
Same route, other flights
Keep nerding
Based on 50 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.