Flight OddsDL4939 JFK → ORD
Delta Air Lines · New York, NY to Chicago, IL · 12 flights observed, 2025-12-20 to 2026-01-04 · 740 mi
DL4939 covers more than one route in the data window — the stats below are for JFK → ORD, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
82%
Median delay
-1 min
90th percentile
+30 min
Cancellation rate
0%
How often is DL4939 on time?
Across 12 flights on JFK → ORD from 2025-12-20 to 2026-01-04, DL4939 arrived within 15 minutes of schedule 82% of the time. The median arrival delay was -1 min, and the worst 10% of flights arrived +30 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 | 9 | 82% |
| 16-30 min | 1 | 9% |
| 31-60 min | 0 | 0% |
| 61-120 min | 0 | 0% |
| 2+ hrs | 1 | 9% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-12 | 8 | 75% | +20 min |
| 2026-01 | 3 | 100% | -10 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 2 | 100% |
| Tue | 2 | 50% |
| Wed | No data | — |
| Thu | No data | — |
| Fri | 2 | 50% |
| Sat | 3 | 100% |
| Sun | 2 | 100% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…