Flight Reliability
UA 4320 · United Airlines
Houston → JAN (IAH–JAN)94% of its flights flew this route. The rest (IAH–GPT, IAD–CMH) are included in these numbers.
78
Usually Fine
WanderNerd Reliability Score
- 80%
- Arrive within 15 minutes
- 7 min
- Average arrival delay
- 2.2%
- Cancelled
- 9 min early
- Median arrival delay
Based on 318 historical flights. Data through May 2026.
What the data says
Sunday scaries are real for this one.
UA 4320 arrived on time 85% of the time on Tuesdays. On Sundays: 72%.
The breakdown
- Mon83%(47 flights)
- Tue85%(39 flights)
- Wed78%(46 flights)
- Thu84%(49 flights)
- Fri76%(41 flights)
- Sat82%(45 flights)
- Sun72%(43 flights)
- 6–9 AM—(5 flights)
- 9 AM–12 PM—(9 flights)
- 3–6 PM—(5 flights)
- 6–9 PM80%(291 flights)
87%
May
Jun 65% → May 87% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 65% | 26 |
| July 2025 | 79% | 28 |
| August 2025 | 76% | 29 |
| September 2025 | 91% | 22 |
| October 2025 | 77% | 13 |
| November 2025 | 72% | 29 |
| December 2025 | 67% | 18 |
| January 2026 | 89% | 27 |
| February 2026 | 89% | 28 |
| March 2026 | 86% | 29 |
| April 2026 | 77% | 30 |
| May 2026 | 87% | 31 |
- Departures on time
- 81%
- Diverted
- 0.3%
- Flights flown
- 310
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 318 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.