Flight Reliability
NK 1139 · Spirit Airlines
Houston → Las Vegas (IAH–LAS)
94
Nerd Approved
WanderNerd Reliability Score
- 93%
- Arrive within 15 minutes
- 7 min early
- Average arrival delay
- 1.8%
- Cancelled
- 15 min early
- Median arrival delay
Based on 56 historical flights. Data through May 2026.
What the data says
Mornings have a slight edge.
Departures between 6–9 AM arrived on time 94% of the time, against 90% between 6–9 PM.
Better than the IAH–LAS route average.
NK 1139 arrived on time 93% of the time, versus 83% across the IAH–LAS route.
Well ahead of the Spirit Airlines network.
NK 1139 arrived on time 93% of the time, versus 74% across the Spirit Airlines network.
The breakdown
- Mon—(8 flights)
- Tue—(8 flights)
- Wed—(8 flights)
- Thu—(8 flights)
- Fri—(7 flights)
- Sat—(8 flights)
- Sun—(8 flights)
- 6–9 AM94%(35 flights)
- 6–9 PM90%(20 flights)
- Departures on time
- 86%
- Diverted
- 0%
- Flights flown
- 55
- Months covered
- 3
Same route, other flights
Keep nerding
Based on 56 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.