DL1539
DL1539 (Delta Air Lines) is a multi-stop service on 7 routes, busiest Atlanta to Tulsa. Of 844 departures recorded from October 2024 to July 2026, 75.7% left on time, according to the US BTS.
- On-time departures75.7%of 844 flights
- Average delay14.8 min
- July 202614▼ 74.1%vs July 2025
- Cancelled2.1%
- Legs flown under this number7
Recorded departures by month
All legs under this number combined; see the leg table.
The most recent periods19 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 32 | 26 | ▼ 18.8% |
| February | 36 | 20 | ▼ 44.4% |
| March | 52 | 29 | ▼ 44.2% |
| April | 52 | 30 | ▼ 42.3% |
| May | 50 | 31 | ▼ 38.0% |
| June | 58 | 18 | ▼ 69.0% |
| July | 54 | 14 | ▼ 74.1% |
| August | 40 | – | – |
| September | 36 | – | – |
| October | 46 | – | in progress |
| November | 36 | – | – |
| December | 58 | – | – |
| Year to date (Jan–Jul) | 334 | 168 | ▼ 49.7% |
according to the US BTS · October 2024 → July 2026
On-time departures by month
On time = departure within 15 minutes of schedule. Non-cancelled flights with a recorded delay only.
The most recent periods19 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 71.0% | 73.1% | ▲ 3.0% |
| February | 78.8% | 85.0% | ▲ 7.9% |
| March | 73.1% | 88.9% | ▲ 21.6% |
| April | 71.2% | 70.0% | ▼ 1.6% |
| May | 66.7% | 90.3% | ▲ 35.5% |
| June | 47.3% | 94.4% | ▲ 99.8% |
| July | 69.2% | 71.4% | ▲ 3.2% |
| August | 85.0% | – | – |
| September | 88.9% | – | – |
| October | 65.2% | – | in progress |
| November | 76.5% | – | – |
| December | 83.6% | – | – |
| Year-to-date average (Jan–Jul) | 68.2% | 81.9% | ▲ 20.1% |
according to the US BTS · October 2024 → July 2026
Average departure delay by month
according to the US BTS · October 2024 → July 2026
Cancelled departures by month
The most recent periods19 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 1 | 0 | ▼ 100.0% |
| February | 3 | 0 | ▼ 100.0% |
| March | 0 | 2 | – |
| April | 0 | 0 | – |
| May | 2 | 0 | ▼ 100.0% |
| June | 3 | 0 | ▼ 100.0% |
| July | 2 | 0 | ▼ 100.0% |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 2 | – | – |
| December | 3 | – | – |
| Year to date (Jan–Jul) | 11 | 2 | ▼ 81.8% |
according to the US BTS · October 2024 → July 2026
This is a historical record of departures already flown, not a forecast for your flight.
Several legs: the headline figure averages all of them. See the leg table.
Cancellation share
- Not cancelled 97.9% 826
- Cancelled 2.1% 18
Share of all recorded flights in the period, all legs. · Oct 12, 2024 → Jul 25, 2026
On time, leg by leg
Departures within 15 minutes of schedule; small figure = departures recorded.
Legs flown under this number
4| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| TUL ATL Tulsa International Airport – Hartsfield Jackson Atlanta International Airport | 1,082 | 16.0 min | 72.5% | 341 |
| ATL TUL Hartsfield Jackson Atlanta International Airport – Tulsa International Airport | 1,082 | 13.9 min | 75.5% | 341 |
| SLC KOA Salt Lake City International Airport – Ellison Onizuka Kona International Airport at Keāhole | 4,769 | 17.4 min | 83.3% | 80 |
| SFO LAX San Francisco International Airport – Los Angeles International Airport | 543 | 0.7 min | 90.3% | 31 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 40 | 40 | 95.0% | 0 |
| November 2024 | 44 | 44 | 84.1% | 0 |
| December 2024 | 42 | 42 | 69.1% | 0 |
| January 2025 | 32 | 31 | 71.0% | 1 |
| February 2025 | 36 | 33 | 78.8% | 3 |
| March 2025 | 52 | 52 | 73.1% | 0 |
| April 2025 | 52 | 52 | 71.2% | 0 |
| May 2025 | 50 | 48 | 66.7% | 2 |
| June 2025 | 58 | 55 | 47.3% | 3 |
| July 2025 | 54 | 52 | 69.2% | 2 |
| August 2025 | 40 | 40 | 85.0% | 0 |
| September 2025 | 36 | 36 | 88.9% | 0 |
| October 2025 | 46 | 46 | 65.2% | 0 |
| November 2025 | 36 | 34 | 76.5% | 2 |
| December 2025 | 58 | 55 | 83.6% | 3 |
| January 2026 | 26 | 26 | 73.1% | 0 |
| February 2026 | 20 | 20 | 85.0% | 0 |
| March 2026 | 29 | 27 | 88.9% | 2 |
| April 2026 | 30 | 30 | 70.0% | 0 |
| May 2026 | 31 | 31 | 90.3% | 0 |
| June 2026 | 18 | 18 | 94.4% | 0 |
| July 2026 | 14 | 14 | 71.4% | 0 |