Flight OddsDL4990 JFK → IAD
Delta Air Lines · New York, NY to Washington, DC · 171 flights observed, 2025-07-01 to 2025-12-19 · 228 mi
DL4990 covers more than one route in the data window — the stats below are for JFK → IAD, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
84%
Median delay
-10 min
90th percentile
+28 min
Cancellation rate
2%
How often is DL4990 on time?
Across 171 flights on JFK → IAD from 2025-07-01 to 2025-12-19, DL4990 arrived within 15 minutes of schedule 84% of the time. The median arrival delay was -10 min, and the worst 10% of flights arrived +28 min or later. 2% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 141 | 84% |
| 16-30 min | 11 | 7% |
| 31-60 min | 8 | 5% |
| 61-120 min | 5 | 3% |
| 2+ hrs | 2 | 1% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 30 | 93% | -10 min |
| 2025-08 | 31 | 94% | -12 min |
| 2025-09 | 30 | 90% | -8 min |
| 2025-10 | 31 | 81% | +6 min |
| 2025-11 | 28 | 71% | +10 min |
| 2025-12 | 17 | 71% | +5 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 24 | 83% |
| Tue | 24 | 79% |
| Wed | 24 | 92% |
| Thu | 24 | 79% |
| Fri | 24 | 75% |
| Sat | 24 | 92% |
| Sun | 23 | 91% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…