About 1 in 4 UA 4959 flights from Greer arrived 15+ minutes late, diverted or cancelled over the past year (22%); 2.1% were cancelled. The typical flight landed 7 minutes early.
UA 4959: GSP → IAD
Scheduled to leave Greer at 2:55 p.m. local time, operated by CommutAir as C5 4959. Over the past year it arrived on time 78% of the time (286 flights), in line with other UA flights on the route at that hour (77%). Last seen in the data Aug 10, 2026.
Usually United Airlines's last flight of the day from Greer to Washington (59% of days). United Airlines's last GSP–IAD flight was cancelled 2.6% of the time, against 1.0% for its earlier ones. If it's cancelled, the next United Airlines flight is usually around 10:30 a.m. the next morning.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 46 | 70% |
| Tuesday | 47 | 87% |
| Wednesday | 47 | 81% |
| Thursday | 45 | 82% |
| Friday | 46 | 80% |
| Saturday | 12 | — |
| Sunday | 43 | 65% |
Why it was late
All flights GSP → IAD · Connecting off UA 4959? Check the risk
Questions
How often is UA 4959 from GSP to IAD late?
United Airlines 4959 from Greer, SC to Washington, DC arrived 15 or more minutes late, was diverted or was cancelled on 22% of 286 scheduled flights between September 2025 and August 2026. 2.1% were cancelled.
Flight numbers change. Figures cover flights with this airline, number and route only. "Likely range" is the 95% interval for the true on-time rate given the number of flights. This is history, not live status: check United Airlines for today's flight. Method.