DL634
DL634 (Delta Air Lines) is a multi-stop service on 7 routes, busiest Detroit to Los Angeles. Of 630 departures recorded from October 2024 to July 2026, 82.4% left on time, according to the US BTS.
- On-time departures82.4%of 630 flights
- Average delay8.7 min
- July 202631▲ 0.0%vs July 2025
- Cancelled0.6%
- Legs flown under this number7
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 | 24 | 32 | ▲ 33.3% |
| February | 28 | 28 | 0.0% |
| March | 31 | 31 | 0.0% |
| April | 30 | 30 | 0.0% |
| May | 31 | 31 | 0.0% |
| June | 30 | 30 | 0.0% |
| July | 31 | 31 | 0.0% |
| August | 31 | – | – |
| September | 30 | – | – |
| October | 31 | – | in progress |
| November | 30 | – | – |
| December | 40 | – | – |
| Year to date (Jan–Jul) | 205 | 213 | ▲ 3.9% |
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 | 75.0% | 73.3% | ▼ 2.2% |
| February | 85.7% | 82.1% | ▼ 4.2% |
| March | 80.7% | 76.7% | ▼ 4.9% |
| April | 86.7% | 93.3% | ▲ 7.7% |
| May | 83.9% | 90.3% | ▲ 7.7% |
| June | 86.7% | 76.7% | ▼ 11.5% |
| July | 87.1% | 83.9% | ▼ 3.7% |
| August | 96.7% | – | – |
| September | 83.3% | – | – |
| October | 90.3% | – | in progress |
| November | 86.7% | – | – |
| December | 72.5% | – | – |
| Year-to-date average (Jan–Jul) | 83.7% | 82.3% | ▼ 1.6% |
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 | 2 | – |
| February | 0 | 0 | – |
| March | 0 | 1 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 1 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 0 | 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 99.4% 626
- Cancelled 0.6% 4
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
2| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| DTW LAX Detroit Metropolitan Wayne County Airport – Los Angeles International Airport | 3,178 | 8.2 min | 83.6% | 531 |
| DCA ATL Ronald Reagan Washington National Airport – Hartsfield Jackson Atlanta International Airport | 880 | 19.9 min | 63.2% | 38 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 12 | 12 | 83.3% | 0 |
| November 2024 | 20 | 20 | 70.0% | 0 |
| December 2024 | 18 | 18 | 55.6% | 0 |
| January 2025 | 24 | 24 | 75.0% | 0 |
| February 2025 | 28 | 28 | 85.7% | 0 |
| March 2025 | 31 | 31 | 80.7% | 0 |
| April 2025 | 30 | 30 | 86.7% | 0 |
| May 2025 | 31 | 31 | 83.9% | 0 |
| June 2025 | 30 | 30 | 86.7% | 0 |
| July 2025 | 31 | 31 | 87.1% | 0 |
| August 2025 | 31 | 30 | 96.7% | 1 |
| September 2025 | 30 | 30 | 83.3% | 0 |
| October 2025 | 31 | 31 | 90.3% | 0 |
| November 2025 | 30 | 30 | 86.7% | 0 |
| December 2025 | 40 | 40 | 72.5% | 0 |
| January 2026 | 32 | 30 | 73.3% | 2 |
| February 2026 | 28 | 28 | 82.1% | 0 |
| March 2026 | 31 | 30 | 76.7% | 1 |
| April 2026 | 30 | 30 | 93.3% | 0 |
| May 2026 | 31 | 31 | 90.3% | 0 |
| June 2026 | 30 | 30 | 76.7% | 0 |
| July 2026 | 31 | 31 | 83.9% | 0 |