Flight OddsUA4304 IAD → TYS
United Airlines · Washington, DC to Knoxville, TN · 179 flights observed, 2025-07-01 to 2026-06-30 · 420 mi
UA4304 covers more than one route in the data window — the stats below are for IAD → TYS, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
78%
Median delay
-3 min
90th percentile
+41 min
Cancellation rate
1%
How often is UA4304 on time?
Across 179 flights on IAD → TYS from 2025-07-01 to 2026-06-30, UA4304 arrived within 15 minutes of schedule 78% of the time. The median arrival delay was -3 min, and the worst 10% of flights arrived +41 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 | 137 | 78% |
| 16-30 min | 16 | 9% |
| 31-60 min | 10 | 6% |
| 61-120 min | 11 | 6% |
| 2+ hrs | 2 | 1% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 28 | 75% | +5 min |
| 2025-08 | 31 | 87% | -3 min |
| 2025-09 | 23 | 91% | -10 min |
| 2025-10 | 6 | 67% | +10 min |
| 2025-11 | 29 | 83% | +11 min |
| 2025-12 | 13 | 54% | +31 min |
| 2026-01 | 5 | 80% | -2 min |
| 2026-05 | 11 | 55% | +10 min |
| 2026-06 | 30 | 77% | +12 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 27 | 89% |
| Tue | 25 | 92% |
| Wed | 22 | 68% |
| Thu | 24 | 71% |
| Fri | 25 | 64% |
| Sat | 26 | 73% |
| Sun | 27 | 85% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…