Flight Reliability
UA 4839 · United Airlines
Houston → AMA (IAH–AMA)
87
Pretty Reliable
WanderNerd Reliability Score
- 83%
- Arrive within 15 minutes
- 8 min
- Average arrival delay
- 0.8%
- Cancelled
- 10 min early
- Median arrival delay
Based on 360 historical flights. Data through May 2026.
What the data says
Sunday scaries are real for this one.
UA 4839 arrived on time 90% of the time on Mondays and just 73% on Sundays. That gap is worth planning around.
A bit ahead of the United Airlines network.
UA 4839 arrived on time 83% of the time, versus 79% across the United Airlines network.
Recent months have been rougher.
UA 4839 arrived on time 78% of the time over the last three months in the data, compared with 91% in the three months before that.
The breakdown
- Mon90%(52 flights)
- Tue83%(52 flights)
- Wed90%(50 flights)
- Thu80%(50 flights)
- Fri76%(49 flights)
- Sat87%(52 flights)
- Sun73%(52 flights)
77%
May
Jun 52% → May 77% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 52% | 29 |
| July 2025 | 80% | 30 |
| August 2025 | 84% | 31 |
| September 2025 | 100% | 30 |
| October 2025 | 87% | 31 |
| November 2025 | 83% | 29 |
| December 2025 | 93% | 28 |
| January 2026 | 83% | 30 |
| February 2026 | 96% | 28 |
| March 2026 | 77% | 31 |
| April 2026 | 80% | 30 |
| May 2026 | 77% | 30 |
- Departures on time
- 81%
- Diverted
- 0%
- Flights flown
- 357
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 360 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.