Flight OddsUA4559 ORD → SDF
United Airlines · Chicago, IL to Louisville, KY · 104 flights observed, 2025-07-05 to 2026-06-30 · 286 mi
UA4559 covers more than one route in the data window — the stats below are for ORD → SDF, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
82%
Median delay
-9 min
90th percentile
+78 min
Cancellation rate
1%
How often is UA4559 on time?
Across 104 flights on ORD → SDF from 2025-07-05 to 2026-06-30, UA4559 arrived within 15 minutes of schedule 82% of the time. The median arrival delay was -9 min, and the worst 10% of flights arrived +78 min or later. 1% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 84 | 82% |
| 16-30 min | 4 | 4% |
| 31-60 min | 1 | 1% |
| 61-120 min | 5 | 5% |
| 2+ hrs | 9 | 9% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 1 | 100% | -7 min |
| 2025-08 | 30 | 90% | -6 min |
| 2025-09 | 24 | 92% | -3 min |
| 2025-10 | 6 | 100% | -16 min |
| 2025-12 | 30 | 63% | +58 min |
| 2026-01 | 5 | 60% | +37 min |
| 2026-05 | 1 | 100% | +6 min |
| 2026-06 | 6 | 83% | +2 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 15 | 87% |
| Tue | 15 | 93% |
| Wed | 14 | 64% |
| Thu | 14 | 79% |
| Fri | 15 | 80% |
| Sat | 15 | 93% |
| Sun | 15 | 73% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…