Flight OddsUA4021 SDF → IAD
United Airlines · Louisville, KY to Washington, DC · 24 flights observed, 2026-03-05 to 2026-03-28 · 451 mi
UA4021 covers more than one route in the data window — the stats below are for SDF → IAD, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
96%
Median delay
-13 min
90th percentile
-2 min
Cancellation rate
0%
How often is UA4021 on time?
Across 24 flights on SDF → IAD from 2026-03-05 to 2026-03-28, UA4021 arrived within 15 minutes of schedule 96% of the time. The median arrival delay was -13 min, and the worst 10% of flights arrived -2 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 | 22 | 96% |
| 16-30 min | 1 | 4% |
| 31-60 min | 0 | 0% |
| 61-120 min | 0 | 0% |
| 2+ hrs | 0 | 0% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2026-03 | 23 | 96% | -14 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 2 | 100% |
| Tue | 3 | 67% |
| Wed | 3 | 100% |
| Thu | 4 | 100% |
| Fri | 4 | 100% |
| Sat | 4 | 100% |
| Sun | 3 | 100% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…