Flight Reliability
UA 4870 · United Airlines
HRL → Houston (HRL–IAH)
72
Usually Fine
WanderNerd Reliability Score
- 78%
- Arrive within 15 minutes
- 12 min
- Average arrival delay
- 3.1%
- Cancelled
- 5 min early
- Median arrival delay
Based on 290 historical flights. Data through May 2026.
What the data says
Saturday is the weak spot.
UA 4870 arrived on time 85% of the time on Tuesdays. On Saturdays: 73%.
A bit behind the HRL–IAH route.
UA 4870 arrived on time 78% of the time, versus 83% across the HRL–IAH route.
Keep a backup plan handy.
UA 4870 was cancelled 3.1% of the time. Typical for U.S. flights is around 1–2%.
Recent months have been rougher.
UA 4870 arrived on time 76% of the time over the last three months in the data, compared with 92% in the three months before that.
The breakdown
- Mon73%(41 flights)
- Tue85%(39 flights)
- Wed76%(38 flights)
- Thu83%(40 flights)
- Fri75%(40 flights)
- Sat73%(40 flights)
- Sun79%(43 flights)
80%
May
Jun 68% → May 80% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 68% | 28 |
| July 2025 | 80% | 30 |
| August 2025 | 61% | 18 |
| November 2025 | 56% | 27 |
| December 2025 | 89% | 28 |
| January 2026 | 100% | 30 |
| February 2026 | 88% | 25 |
| March 2026 | 76% | 29 |
| April 2026 | 73% | 30 |
| May 2026 | 80% | 30 |
- Departures on time
- 85%
- Diverted
- 0%
- Flights flown
- 281
- Months covered
- 11
Same route, other flights
Keep nerding
Based on 290 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.