Flight Reliability
UA 4856 · United Airlines
Houston → CRP (IAH–CRP)86% of its flights flew this route. The rest (PHL–IAD, ORF–IAD) are included in these numbers.
82
Pretty Reliable
WanderNerd Reliability Score
- 82%
- Arrive within 15 minutes
- 6 min
- Average arrival delay
- 1.3%
- Cancelled
- 9 min early
- Median arrival delay
Based on 156 historical flights. Data through May 2026.
What the data says
The late departure is the smart one here.
UA 4856 departing between 9 PM–12 AM arrived on time 87% of the time, versus 67% between 6–9 PM.
Wednesdays have been rough.
UA 4856 arrived on time 100% of the time on Tuesdays and just 73% on Wednesdays. That gap is worth planning around.
The breakdown
- Mon74%(23 flights)
- Tue100%(12 flights)
- Wed73%(22 flights)
- Thu88%(24 flights)
- Fri74%(23 flights)
- Sat96%(22 flights)
- Sun78%(27 flights)
- 12–3 PM—(6 flights)
- 3–6 PM—(6 flights)
- 6–9 PM67%(30 flights)
- 9 PM–12 AM87%(111 flights)
91%
May
Jun 54% → May 91% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 54% | 28 |
| July 2025 | 87% | 30 |
| August 2025 | 83% | 18 |
| February 2026 | 100% | 10 |
| March 2026 | 88% | 24 |
| April 2026 | 91% | 21 |
| May 2026 | 91% | 11 |
- Departures on time
- 81%
- Diverted
- 0.6%
- Flights flown
- 153
- Months covered
- 9
Same route, other flights
Keep nerding
Based on 156 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.