DL1223
DL1223 (Delta Air Lines) is a multi-stop service on 4 routes, busiest Atlanta to Houston. Of 995 departures recorded from October 2024 to July 2026, 75.1% left on time, according to the US BTS.
- On-time departures75.1%of 995 flights
- Average delay14.4 min
- July 202648▲ 54.8%vs July 2025
- Cancelled1.7%
- Legs flown under this number4
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 | 62 | 56 | ▼ 9.7% |
| February | 56 | 53 | ▼ 5.4% |
| March | 62 | 37 | ▼ 40.3% |
| April | 60 | 48 | ▼ 20.0% |
| May | 62 | 33 | ▼ 46.8% |
| June | 37 | 29 | ▼ 21.6% |
| July | 31 | 48 | ▲ 54.8% |
| August | 31 | – | – |
| September | 30 | – | – |
| October | 31 | – | in progress |
| November | 30 | – | – |
| December | 43 | – | – |
| Year to date (Jan–Jul) | 370 | 304 | ▼ 17.8% |
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 | 79.3% | 58.0% | ▼ 26.9% |
| February | 76.8% | 73.6% | ▼ 4.2% |
| March | 77.4% | 77.8% | ▲ 0.5% |
| April | 77.6% | 87.5% | ▲ 12.8% |
| May | 67.7% | 81.8% | ▲ 20.8% |
| June | 83.8% | 51.7% | ▼ 38.3% |
| July | 87.1% | 45.8% | ▼ 47.4% |
| August | 93.6% | – | – |
| September | 66.7% | – | – |
| October | 67.7% | – | in progress |
| November | 86.7% | – | – |
| December | 67.5% | – | – |
| Year-to-date average (Jan–Jul) | 78.5% | 68.0% | ▼ 13.4% |
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 | 4 | 6 | ▲ 50.0% |
| February | 0 | 0 | – |
| March | 0 | 1 | – |
| April | 2 | 0 | ▼ 100.0% |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 3 | – | – |
| Year to date (Jan–Jul) | 6 | 7 | ▲ 16.7% |
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 98.3% 978
- Cancelled 1.7% 17
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
4| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| ATL IAH Hartsfield Jackson Atlanta International Airport – George Bush Intercontinental Airport | 1,108 | 11.8 min | 76.3% | 395 |
| IAH ATL George Bush Intercontinental Airport – Hartsfield Jackson Atlanta International Airport | 1,108 | 17.5 min | 70.6% | 369 |
| RSW BOS Southwest Florida International Airport – Boston Logan International Airport | 2,013 | 14.4 min | 79.4% | 195 |
| SEA GEG Seattle–Tacoma International Airport – Spokane International Airport | 359 | 11.3 min | 83.3% | 36 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 40 | 40 | 87.5% | 0 |
| November 2024 | 59 | 58 | 91.4% | 1 |
| December 2024 | 57 | 57 | 68.4% | 0 |
| January 2025 | 62 | 58 | 79.3% | 4 |
| February 2025 | 56 | 56 | 76.8% | 0 |
| March 2025 | 62 | 62 | 77.4% | 0 |
| April 2025 | 60 | 58 | 77.6% | 2 |
| May 2025 | 62 | 62 | 67.7% | 0 |
| June 2025 | 37 | 37 | 83.8% | 0 |
| July 2025 | 31 | 31 | 87.1% | 0 |
| August 2025 | 31 | 31 | 93.6% | 0 |
| September 2025 | 30 | 30 | 66.7% | 0 |
| October 2025 | 31 | 31 | 67.7% | 0 |
| November 2025 | 30 | 30 | 86.7% | 0 |
| December 2025 | 43 | 40 | 67.5% | 3 |
| January 2026 | 56 | 50 | 58.0% | 6 |
| February 2026 | 53 | 53 | 73.6% | 0 |
| March 2026 | 37 | 36 | 77.8% | 1 |
| April 2026 | 48 | 48 | 87.5% | 0 |
| May 2026 | 33 | 33 | 81.8% | 0 |
| June 2026 | 29 | 29 | 51.7% | 0 |
| July 2026 | 48 | 48 | 45.8% | 0 |