DL840
DL840 (Delta Air Lines) is a multi-stop service on 6 routes, busiest Denver to Atlanta. Of 645 departures recorded from October 2024 to July 2026, 73.9% left on time, according to the US BTS.
- On-time departures73.9%of 645 flights
- Average delay21.6 min
- July 202631▲ 0.0%vs July 2025
- Cancelled0.9%
- Legs flown under this number6
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 | 19 | 31 | ▲ 63.2% |
| February | 16 | 45 | ▲ 181.3% |
| March | 18 | 62 | ▲ 244.4% |
| April | 24 | 42 | ▲ 75.0% |
| May | 31 | 31 | 0.0% |
| June | 30 | 30 | 0.0% |
| July | 31 | 31 | 0.0% |
| August | 31 | – | – |
| September | 30 | – | – |
| October | 31 | – | in progress |
| November | 29 | – | – |
| December | 31 | – | – |
| Year to date (Jan–Jul) | 169 | 272 | ▲ 60.9% |
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 | 68.4% | 93.3% | ▲ 36.4% |
| February | 68.8% | 77.8% | ▲ 13.1% |
| March | 72.2% | 81.7% | ▲ 13.1% |
| April | 66.7% | 81.0% | ▲ 21.4% |
| May | 54.8% | 86.7% | ▲ 58.0% |
| June | 60.0% | 76.7% | ▲ 27.8% |
| July | 51.6% | 66.7% | ▲ 29.2% |
| August | 80.7% | – | – |
| September | 73.3% | – | – |
| October | 87.1% | – | in progress |
| November | 75.9% | – | – |
| December | 73.3% | – | – |
| Year-to-date average (Jan–Jul) | 63.2% | 80.5% | ▲ 27.4% |
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 | 0 | 1 | – |
| February | 0 | 0 | – |
| March | 0 | 2 | – |
| April | 0 | 0 | – |
| May | 0 | 1 | – |
| June | 0 | 0 | – |
| July | 0 | 1 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 1 | – | – |
| Year to date (Jan–Jul) | 0 | 5 |
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% 639
- Cancelled 0.9% 6
Share of all recorded flights in the period, all legs. · Oct 13, 2024 → Jul 31, 2026
On time, leg by leg
Departures within 15 minutes of schedule; small figure = departures recorded.
Legs flown under this number
3| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| DEN ATL Denver International Airport – Hartsfield Jackson Atlanta International Airport | 1,927 | 23.9 min | 72.8% | 487 |
| ATL DEN Hartsfield Jackson Atlanta International Airport – Denver International Airport | 1,927 | 7.5 min | 83.5% | 91 |
| FLL JFK Fort Lauderdale Hollywood International Airport – John F. Kennedy International Airport | 1,723 | 28.1 min | 65.7% | 35 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 14 | 14 | 78.6% | 0 |
| November 2024 | 19 | 19 | 68.4% | 0 |
| December 2024 | 19 | 19 | 57.9% | 0 |
| January 2025 | 19 | 19 | 68.4% | 0 |
| February 2025 | 16 | 16 | 68.8% | 0 |
| March 2025 | 18 | 18 | 72.2% | 0 |
| April 2025 | 24 | 24 | 66.7% | 0 |
| May 2025 | 31 | 31 | 54.8% | 0 |
| June 2025 | 30 | 30 | 60.0% | 0 |
| July 2025 | 31 | 31 | 51.6% | 0 |
| August 2025 | 31 | 31 | 80.7% | 0 |
| September 2025 | 30 | 30 | 73.3% | 0 |
| October 2025 | 31 | 31 | 87.1% | 0 |
| November 2025 | 29 | 29 | 75.9% | 0 |
| December 2025 | 31 | 30 | 73.3% | 1 |
| January 2026 | 31 | 30 | 93.3% | 1 |
| February 2026 | 45 | 45 | 77.8% | 0 |
| March 2026 | 62 | 60 | 81.7% | 2 |
| April 2026 | 42 | 42 | 81.0% | 0 |
| May 2026 | 31 | 30 | 86.7% | 1 |
| June 2026 | 30 | 30 | 76.7% | 0 |
| July 2026 | 31 | 30 | 66.7% | 1 |