DL421
DL421 (Delta Air Lines) is a multi-stop service on 2 routes, busiest Detroit to Las Vegas. Of 916 departures recorded from October 2024 to July 2026, 81.8% left on time, according to the US BTS.
- On-time departures81.8%of 916 flights
- Average delay10.0 min
- July 202631▲ 0.0%vs July 2025
- Cancelled0.1%
- 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 | 56 | 57 | ▲ 1.8% |
| February | 56 | 56 | 0.0% |
| March | 62 | 62 | 0.0% |
| April | 43 | 42 | ▼ 2.3% |
| May | 56 | 31 | ▼ 44.6% |
| June | 37 | 30 | ▼ 18.9% |
| July | 31 | 31 | 0.0% |
| August | 31 | – | – |
| September | 30 | – | – |
| October | 31 | – | in progress |
| November | 30 | – | – |
| December | 28 | – | – |
| Year to date (Jan–Jul) | 341 | 309 | ▼ 9.4% |
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 | 75.0% | 87.7% | ▲ 17.0% |
| February | 71.4% | 80.4% | ▲ 12.5% |
| March | 85.5% | 83.9% | ▼ 1.9% |
| April | 74.4% | 97.6% | ▲ 31.2% |
| May | 83.9% | 71.0% | ▼ 15.4% |
| June | 67.6% | 80.0% | ▲ 18.4% |
| July | 74.2% | 53.3% | ▼ 28.1% |
| August | 90.3% | – | – |
| September | 80.0% | – | – |
| October | 87.1% | – | in progress |
| November | 90.0% | – | – |
| December | 71.4% | – | – |
| Year-to-date average (Jan–Jul) | 76.0% | 79.1% | ▲ 4.1% |
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 | 0 | 0 | – |
| February | 0 | 0 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 1 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 0 | 1 |
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 99.9% 915
- Cancelled 0.1% 1
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 |
|---|---|---|---|---|
| DTW LAS Detroit Metropolitan Wayne County Airport – Harry Reid International Airport | 2,808 | 9.8 min | 81.5% | 650 |
| LAS DTW Harry Reid International Airport – Detroit Metropolitan Wayne County Airport | 2,808 | 10.5 min | 82.3% | 266 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 90.0% | 0 |
| November 2024 | 50 | 50 | 94.0% | 0 |
| December 2024 | 46 | 46 | 97.8% | 0 |
| January 2025 | 56 | 56 | 75.0% | 0 |
| February 2025 | 56 | 56 | 71.4% | 0 |
| March 2025 | 62 | 62 | 85.5% | 0 |
| April 2025 | 43 | 43 | 74.4% | 0 |
| May 2025 | 56 | 56 | 83.9% | 0 |
| June 2025 | 37 | 37 | 67.6% | 0 |
| July 2025 | 31 | 31 | 74.2% | 0 |
| August 2025 | 31 | 31 | 90.3% | 0 |
| September 2025 | 30 | 30 | 80.0% | 0 |
| October 2025 | 31 | 31 | 87.1% | 0 |
| November 2025 | 30 | 30 | 90.0% | 0 |
| December 2025 | 28 | 28 | 71.4% | 0 |
| January 2026 | 57 | 57 | 87.7% | 0 |
| February 2026 | 56 | 56 | 80.4% | 0 |
| March 2026 | 62 | 62 | 83.9% | 0 |
| April 2026 | 42 | 42 | 97.6% | 0 |
| May 2026 | 31 | 31 | 71.0% | 0 |
| June 2026 | 30 | 30 | 80.0% | 0 |
| July 2026 | 31 | 30 | 53.3% | 1 |