Flight Reliability
UA 4009 · United Airlines
Houston → El Paso (IAH–ELP)87% of its flights flew this route. The rest (SAT–IAH, IAH–BHM) are included in these numbers.
- 82%
- Arrive within 15 minutes
- 8 min
- Average arrival delay
- 0%
- Cancelled
- 8 min early
- Median arrival delay
Based on 249 historical flights. Data through May 2026.
What the data says
Tuesdays have been rough.
UA 4009 arrived on time 91% of the time on Wednesdays and just 74% on Tuesdays. That gap is worth planning around.
A bit ahead of the United Airlines network.
UA 4009 arrived on time 82% of the time, versus 79% across the United Airlines network.
It basically never cancels.
Out of 249 scheduled flights, only 0.0% were cancelled.
Recent months have been rougher.
UA 4009 arrived on time 75% of the time over the last three months in the data, compared with 87% in the three months before that.
The breakdown
- Mon80%(35 flights)
- Tue74%(35 flights)
- Wed91%(35 flights)
- Thu86%(36 flights)
- Fri83%(36 flights)
- Sat83%(36 flights)
- Sun78%(36 flights)
- 9 AM–12 PM—(1 flights)
- 12–3 PM—(4 flights)
- 6–9 PM82%(244 flights)
Oct 94% → May 77% on time
| Month | On-time percentage | Flights |
|---|---|---|
| October 2025 | 94% | 31 |
| November 2025 | 80% | 30 |
| December 2025 | 77% | 31 |
| January 2026 | 94% | 31 |
| February 2026 | 89% | 28 |
| March 2026 | 74% | 31 |
| April 2026 | 73% | 30 |
| May 2026 | 77% | 31 |
- Departures on time
- 77%
- Diverted
- 0%
- Flights flown
- 249
- Months covered
- 9
Same route, other flights
Keep nerding
Based on 249 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.