Flight Reliability
NK 1181 · Spirit Airlines
Houston → Chicago (IAH–ORD)
91
Nerd Approved
WanderNerd Reliability Score
- 94%
- Arrive within 15 minutes
- 3 min early
- Average arrival delay
- 2.9%
- Cancelled
- 6 min early
- Median arrival delay
Based on 35 historical flights. Data through May 2026.
What the data says
Well ahead of the IAH–ORD route.
NK 1181 arrived on time 94% of the time, versus 75% across the IAH–ORD route.
Well ahead of the Spirit Airlines network.
NK 1181 arrived on time 94% of the time, versus 74% across the Spirit Airlines network.
The breakdown
- Mon—(5 flights)
- Tue—(5 flights)
- Wed—(5 flights)
- Thu—(5 flights)
- Fri—(5 flights)
- Sat—(4 flights)
- Sun—(5 flights)
- 3–6 AM97%(29 flights)
- 9 AM–12 PM—(5 flights)
- Departures on time
- 91%
- Diverted
- 0%
- Flights flown
- 34
- Months covered
- 2
Same route, other flights
Keep nerding
Based on 35 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.