Flight Reliability
UA 4373 · United Airlines
GSO → Washington (GSO–IAD)88% of its flights flew this route. The rest (CRP–IAH, IAD–CVG) are included in these numbers.
- 88%
- Arrive within 15 minutes
- 12 min
- Average arrival delay
- 1.1%
- Cancelled
- 10 min early
- Median arrival delay
Based on 175 historical flights. Data through May 2026.
What the data says
3–6 PM has a slight edge.
Departures between 3–6 PM arrived on time 94% of the time, against 87% between 9 AM–12 PM.
Mondays have been rough.
UA 4373 arrived on time 100% of the time on Fridays and just 75% on Mondays. That gap is worth planning around.
A bit ahead of the GSO–IAD route.
UA 4373 arrived on time 88% of the time, versus 84% across the GSO–IAD route.
Better than the United Airlines network average.
UA 4373 arrived on time 88% of the time, versus 79% across the United Airlines network.
The breakdown
- Mon75%(24 flights)
- Tue89%(26 flights)
- Wed78%(23 flights)
- Thu92%(26 flights)
- Fri100%(24 flights)
- Sat89%(27 flights)
- Sun91%(23 flights)
- 9 AM–12 PM87%(157 flights)
- 3–6 PM94%(16 flights)
Jun 83% → May 91% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 83% | 29 |
| July 2025 | 90% | 31 |
| August 2025 | 86% | 28 |
| September 2025 | 92% | 24 |
| October 2025 | 92% | 25 |
| December 2025 | 79% | 14 |
| May 2026 | 91% | 11 |
- Departures on time
- 86%
- Diverted
- 0%
- Flights flown
- 173
- Months covered
- 10
Same route, other flights
Keep nerding
Based on 175 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.