DL665
DL665 (Delta Air Lines) is a multi-stop service on 2 routes, busiest Ontario to Atlanta. Of 1,316 departures recorded from October 2024 to July 2026, 86.7% left on time, according to the US BTS.
- On-time departures86.7%of 1,316 flights
- Average delay5.7 min
- July 202662▲ 0.0%vs July 2025
- Cancelled1.4%
- Legs flown under this number2
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 | 62 | 0.0% |
| February | 56 | 56 | 0.0% |
| March | 62 | 62 | 0.0% |
| April | 60 | 60 | 0.0% |
| May | 62 | 62 | 0.0% |
| June | 60 | 60 | 0.0% |
| July | 62 | 62 | 0.0% |
| August | 62 | – | – |
| September | 60 | – | – |
| October | 62 | – | in progress |
| November | 60 | – | – |
| December | 62 | – | – |
| Year to date (Jan–Jul) | 424 | 424 | 0.0% |
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 | 84.5% | 74.1% | ▼ 12.2% |
| February | 91.1% | 85.7% | ▼ 5.9% |
| March | 85.5% | 83.1% | ▼ 2.8% |
| April | 93.3% | 86.7% | ▼ 7.1% |
| May | 83.9% | 80.3% | ▼ 4.2% |
| June | 85.0% | 79.3% | ▼ 6.7% |
| July | 96.8% | 80.7% | ▼ 16.7% |
| August | 88.7% | – | – |
| September | 90.0% | – | – |
| October | 87.1% | – | in progress |
| November | 81.4% | – | – |
| December | 89.7% | – | – |
| Year-to-date average (Jan–Jul) | 88.6% | 81.4% | ▼ 8.1% |
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 | 4 | 4 | 0.0% |
| February | 0 | 0 | – |
| March | 0 | 3 | – |
| April | 0 | 0 | – |
| May | 0 | 1 | – |
| June | 0 | 2 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 1 | – | – |
| December | 4 | – | – |
| Year to date (Jan–Jul) | 4 | 10 | ▲ 150.0% |
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 98.6% 1,297
- Cancelled 1.4% 19
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
2| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| ONT ATL Ontario International Airport – Hartsfield Jackson Atlanta International Airport | 3,050 | 7.5 min | 84.3% | 658 |
| ATL ONT Hartsfield Jackson Atlanta International Airport – Ontario International Airport | 3,050 | 3.9 min | 89.2% | 658 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 40 | 40 | 92.5% | 0 |
| November 2024 | 60 | 60 | 98.3% | 0 |
| December 2024 | 62 | 62 | 91.9% | 0 |
| January 2025 | 62 | 58 | 84.5% | 4 |
| February 2025 | 56 | 56 | 91.1% | 0 |
| March 2025 | 62 | 62 | 85.5% | 0 |
| April 2025 | 60 | 60 | 93.3% | 0 |
| May 2025 | 62 | 62 | 83.9% | 0 |
| June 2025 | 60 | 60 | 85.0% | 0 |
| July 2025 | 62 | 62 | 96.8% | 0 |
| August 2025 | 62 | 62 | 88.7% | 0 |
| September 2025 | 60 | 60 | 90.0% | 0 |
| October 2025 | 62 | 62 | 87.1% | 0 |
| November 2025 | 60 | 59 | 81.4% | 1 |
| December 2025 | 62 | 58 | 89.7% | 4 |
| January 2026 | 62 | 58 | 74.1% | 4 |
| February 2026 | 56 | 56 | 85.7% | 0 |
| March 2026 | 62 | 59 | 83.1% | 3 |
| April 2026 | 60 | 60 | 86.7% | 0 |
| May 2026 | 62 | 61 | 80.3% | 1 |
| June 2026 | 60 | 58 | 79.3% | 2 |
| July 2026 | 62 | 62 | 80.7% | 0 |