DL851
DL851 (Delta Air Lines) is a multi-stop service on 10 routes, busiest Las Vegas to Detroit. Of 535 departures recorded from October 2024 to July 2026, 82.9% left on time, according to the US BTS.
- On-time departures82.9%of 535 flights
- Average delay10.1 min
- July 202629▼ 6.5%vs July 2025
- Cancelled1.9%
- Legs flown under this number10
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 | 4 | 30 | ▲ 650.0% |
| February | 2 | 40 | ▲ 1,900.0% |
| March | 40 | 60 | ▲ 50.0% |
| April | 22 | 42 | ▲ 90.9% |
| May | 25 | 27 | ▲ 8.0% |
| June | 30 | 5 | ▼ 83.3% |
| July | 31 | 29 | ▼ 6.5% |
| August | 22 | – | – |
| September | 15 | – | – |
| October | 22 | – | in progress |
| November | 18 | – | – |
| December | 20 | – | – |
| Year to date (Jan–Jul) | 154 | 233 | ▲ 51.3% |
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 | 100.0% | 75.9% | ▼ 24.1% |
| February | 50.0% | 80.6% | ▲ 61.1% |
| March | 81.6% | 86.4% | ▲ 6.0% |
| April | 90.9% | 83.3% | ▼ 8.3% |
| May | 88.0% | 88.5% | ▲ 0.5% |
| June | 76.7% | 60.0% | ▼ 21.7% |
| July | 80.0% | 89.7% | ▲ 12.1% |
| August | 68.2% | – | – |
| September | 86.7% | – | – |
| October | 95.5% | – | in progress |
| November | 83.3% | – | – |
| December | 75.0% | – | – |
| Year-to-date average (Jan–Jul) | 81.0% | 80.6% | ▼ 0.5% |
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 | 4 | – |
| March | 2 | 1 | ▼ 50.0% |
| April | 0 | 0 | – |
| May | 0 | 1 | – |
| June | 0 | 0 | – |
| July | 1 | 0 | ▼ 100.0% |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 3 | 7 | ▲ 133.3% |
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 98.1% 525
- Cancelled 1.9% 10
Share of all recorded flights in the period, all legs. · Oct 12, 2024 → Jul 30, 2026
On time, leg by leg
Departures within 15 minutes of schedule; small figure = departures recorded.
Legs flown under this number
5| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| LAS DTW Harry Reid International Airport – Detroit Metropolitan Wayne County Airport | 2,808 | 10.6 min | 83.5% | 274 |
| IAH LGA George Bush Intercontinental Airport – LaGuardia Airport | 2,277 | 17.7 min | 77.6% | 62 |
| DTW LAS Detroit Metropolitan Wayne County Airport – Harry Reid International Airport | 2,808 | 3.8 min | 86.1% | 36 |
| DAY ATL James M. Cox Dayton International Airport – Hartsfield Jackson Atlanta International Airport | 697 | 2.2 min | 83.3% | 31 |
| ATL DAY Hartsfield Jackson Atlanta International Airport – James M. Cox Dayton International Airport | 697 | 2.4 min | 86.7% | 31 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 14 | 14 | 100.0% | 0 |
| November 2024 | 14 | 14 | 64.3% | 0 |
| December 2024 | 23 | 23 | 82.6% | 0 |
| January 2025 | 4 | 4 | 100.0% | 0 |
| February 2025 | 2 | 2 | 50.0% | 0 |
| March 2025 | 40 | 38 | 81.6% | 2 |
| April 2025 | 22 | 22 | 90.9% | 0 |
| May 2025 | 25 | 25 | 88.0% | 0 |
| June 2025 | 30 | 30 | 76.7% | 0 |
| July 2025 | 31 | 30 | 80.0% | 1 |
| August 2025 | 22 | 22 | 68.2% | 0 |
| September 2025 | 15 | 15 | 86.7% | 0 |
| October 2025 | 22 | 22 | 95.5% | 0 |
| November 2025 | 18 | 18 | 83.3% | 0 |
| December 2025 | 20 | 20 | 75.0% | 0 |
| January 2026 | 30 | 29 | 75.9% | 1 |
| February 2026 | 40 | 36 | 80.6% | 4 |
| March 2026 | 60 | 59 | 86.4% | 1 |
| April 2026 | 42 | 42 | 83.3% | 0 |
| May 2026 | 27 | 26 | 88.5% | 1 |
| June 2026 | 5 | 5 | 60.0% | 0 |
| July 2026 | 29 | 29 | 89.7% | 0 |