Flight Reliability
UA 4955 · United Airlines
Greenville → Washington (GSP–IAD)
96
Nerd Approved
WanderNerd Reliability Score
- 92%
- Arrive within 15 minutes
- 8 min
- Average arrival delay
- 1.0%
- Cancelled
- 5 min early
- Median arrival delay
Based on 104 historical flights. Data through May 2026.
What the data says
Tuesdays have been rough.
UA 4955 arrived on time 100% of the time on Wednesdays and just 73% on Tuesdays. That gap is worth planning around.
Better than the GSP–IAD route average.
UA 4955 arrived on time 92% of the time, versus 83% across the GSP–IAD route.
Better than the United Airlines network average.
UA 4955 arrived on time 92% of the time, versus 79% across the United Airlines network.
The breakdown
- Mon94%(17 flights)
- Tue73%(11 flights)
- Wed100%(11 flights)
- Thu100%(15 flights)
- Fri100%(16 flights)
- Sat88%(16 flights)
- Sun88%(17 flights)
88%
Sep
Jun 93% → Sep 88% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 93% | 30 |
| July 2025 | 93% | 30 |
| August 2025 | 93% | 27 |
| September 2025 | 88% | 16 |
- Departures on time
- 92%
- Diverted
- 0%
- Flights flown
- 103
- Months covered
- 4
Same route, other flights
Keep nerding
Based on 104 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.