Flight OddsUA4539 ROA → ORD
United Airlines · Roanoke, VA to Chicago, IL · 113 flights observed, 2026-01-06 to 2026-04-29 · 530 mi
UA4539 covers more than one route in the data window — the stats below are for ROA → ORD, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
82%
Median delay
-12 min
90th percentile
+83 min
Cancellation rate
3%
How often is UA4539 on time?
Across 113 flights on ROA → ORD from 2026-01-06 to 2026-04-29, UA4539 arrived within 15 minutes of schedule 82% of the time. The median arrival delay was -12 min, and the worst 10% of flights arrived +83 min or later. 3% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 88 | 82% |
| 16-30 min | 2 | 2% |
| 31-60 min | 5 | 5% |
| 61-120 min | 5 | 5% |
| 2+ hrs | 7 | 7% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2026-01 | 23 | 78% | +32 min |
| 2026-02 | 26 | 92% | +11 min |
| 2026-03 | 30 | 67% | +28 min |
| 2026-04 | 28 | 93% | -1 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 15 | 93% |
| Tue | 17 | 88% |
| Wed | 16 | 88% |
| Thu | 15 | 87% |
| Fri | 14 | 71% |
| Sat | 15 | 67% |
| Sun | 15 | 80% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…