Flight Reliability
UA 4963 · United Airlines
Washington → Greenville (IAD–GSP)100% of its flights flew this route. The rest (IAH–BTR) are included in these numbers.
- 75%
- Arrive within 15 minutes
- 24 min
- Average arrival delay
- 3.0%
- Cancelled
- 6 min early
- Median arrival delay
Based on 335 historical flights. Data through May 2026.
What the data says
Sunday scaries are real for this one.
UA 4963 arrived on time 81% of the time on Thursdays and just 66% on Sundays. That gap is worth planning around.
A bit behind the United Airlines network.
UA 4963 arrived on time 75% of the time, versus 79% across the United Airlines network.
Keep a backup plan handy.
UA 4963 was cancelled 3.0% of the time. Typical for U.S. flights is around 1–2%.
Trending in the right direction.
UA 4963 arrived on time 82% of the time over the last three months in the data, compared with 71% in the three months before that.
The breakdown
- Mon73%(48 flights)
- Tue75%(47 flights)
- Wed79%(47 flights)
- Thu81%(47 flights)
- Fri77%(48 flights)
- Sat74%(46 flights)
- Sun66%(41 flights)
- 12–3 PM—(1 flights)
- 3–6 PM75%(323 flights)
Jun 56% → May 70% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 56% | 27 |
| July 2025 | 42% | 24 |
| August 2025 | 89% | 27 |
| September 2025 | 86% | 29 |
| October 2025 | 74% | 31 |
| November 2025 | 83% | 30 |
| December 2025 | 65% | 31 |
| January 2026 | 78% | 27 |
| February 2026 | 71% | 28 |
| March 2026 | 84% | 31 |
| April 2026 | 93% | 29 |
| May 2026 | 70% | 10 |
- Departures on time
- 78%
- Diverted
- 0.3%
- Flights flown
- 324
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 335 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.