DL1521
DL1521 (Delta Air Lines) is a multi-stop service on 13 routes, busiest Santa Ana to Atlanta. Of 432 departures recorded from October 2024 to July 2026, 79.7% left on time, according to the US BTS.
- On-time departures79.7%of 432 flights
- Average delay10.1 min
- July 202631
- Cancelled0.9%
- Legs flown under this number13
Recorded departures by month
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods16 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | – | 15 | – |
| February | – | 22 | – |
| March | 14 | 28 | ▲ 100.0% |
| April | 30 | 20 | ▼ 33.3% |
| May | 31 | 3 | ▼ 90.3% |
| June | 7 | 24 | ▲ 242.9% |
| July | – | 31 | – |
| August | 20 | – | – |
| September | 50 | – | – |
| October | 14 | – | in progress |
| November | 30 | – | – |
| December | 22 | – | – |
according to the US BTS · October 2024 → July 2026
On-time departures by month
Months without data are left blank.
On time = departure within 15 minutes of schedule. Non-cancelled flights with a recorded delay only.
The most recent periods16 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | – | 93.3% | – |
| February | – | 100.0% | – |
| March | 78.6% | 76.9% | ▼ 2.1% |
| April | 83.3% | 95.0% | ▲ 14.0% |
| May | 74.2% | 100.0% | ▲ 34.8% |
| June | 85.7% | 60.9% | ▼ 29.0% |
| July | – | 77.4% | – |
| August | 65.0% | – | – |
| September | 80.0% | – | – |
| October | 78.6% | – | in progress |
| November | 73.3% | – | – |
| December | 68.2% | – | – |
according to the US BTS · October 2024 → July 2026
Average departure delay by month
Months without data are left blank.
according to the US BTS · October 2024 → July 2026
Cancelled departures by month
Months without data are left blank.
The most recent periods16 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | – | 0 | – |
| February | – | 1 | – |
| March | 0 | 2 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 1 | – |
| July | – | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
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 99.1% 428
- Cancelled 0.9% 4
Share of all recorded flights in the period, all legs. · Oct 12, 2024 → Jul 31, 2026
On time, leg by leg
Departures within 15 minutes of schedule; small figure = departures recorded.
Legs flown under this number
7| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| SNA ATL John Wayne Orange County International Airport – Hartsfield Jackson Atlanta International Airport | 3,081 | 10.2 min | 80.2% | 87 |
| SLC ABQ Salt Lake City International Airport – Albuquerque International Sunport | 794 | -0.9 min | 83.6% | 67 |
| SLC JAC Salt Lake City International Airport – Jackson Hole Airport | 330 | 3.3 min | 82.9% | 41 |
| ATL RSW Hartsfield Jackson Atlanta International Airport – Southwest Florida International Airport | 831 | 23.0 min | 73.2% | 41 |
| FLL JFK Fort Lauderdale Hollywood International Airport – John F. Kennedy International Airport | 1,723 | 11.3 min | 71.9% | 32 |
| LAS SEA Harry Reid International Airport – Seattle–Tacoma International Airport | 1,395 | 30.1 min | 80.0% | 31 |
| BOS BNA Boston Logan International Airport – Nashville International Airport | 1,514 | 29.7 min | 56.7% | 30 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 90.0% | 0 |
| November 2024 | 30 | 30 | 80.0% | 0 |
| December 2024 | 21 | 21 | 85.7% | 0 |
| March 2025 | 14 | 14 | 78.6% | 0 |
| April 2025 | 30 | 30 | 83.3% | 0 |
| May 2025 | 31 | 31 | 74.2% | 0 |
| June 2025 | 7 | 7 | 85.7% | 0 |
| August 2025 | 20 | 20 | 65.0% | 0 |
| September 2025 | 50 | 50 | 80.0% | 0 |
| October 2025 | 14 | 14 | 78.6% | 0 |
| November 2025 | 30 | 30 | 73.3% | 0 |
| December 2025 | 22 | 22 | 68.2% | 0 |
| January 2026 | 15 | 15 | 93.3% | 0 |
| February 2026 | 22 | 21 | 100.0% | 1 |
| March 2026 | 28 | 26 | 76.9% | 2 |
| April 2026 | 20 | 20 | 95.0% | 0 |
| May 2026 | 3 | 3 | 100.0% | 0 |
| June 2026 | 24 | 23 | 60.9% | 1 |
| July 2026 | 31 | 31 | 77.4% | 0 |