Flight OddsUA4521 IAD → GSP
United Airlines · Washington, DC to Greer, SC · 3 flights observed, 2026-05-02 to 2026-05-16 · 384 mi
UA4521 covers more than one route in the data window — the stats below are for IAD → GSP, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
67%
Median delay
-8 min
90th percentile
+14 min
Cancellation rate
0%
How often is UA4521 on time?
Across 3 flights on IAD → GSP from 2026-05-02 to 2026-05-16, UA4521 arrived within 15 minutes of schedule 67% of the time. The median arrival delay was -8 min, and the worst 10% of flights arrived +14 min or later. 0% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 2 | 67% |
| 16-30 min | 1 | 33% |
| 31-60 min | 0 | 0% |
| 61-120 min | 0 | 0% |
| 2+ hrs | 0 | 0% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2026-05 | 3 | 67% | -1 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | No data | — |
| Tue | No data | — |
| Wed | No data | — |
| Thu | No data | — |
| Fri | No data | — |
| Sat | 3 | 67% |
| Sun | No data | — |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…