DL437
DL437 (Delta Air Lines) is a multi-stop service on 2 routes, busiest Los Angeles to Boston. Of 579 departures recorded from October 2024 to July 2026, 75.8% left on time, according to the US BTS.
- On-time departures75.8%of 579 flights
- Average delay23.3 min
- July 202631▲ 3.3%vs July 2025
- Cancelled0.9%
- 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 | 16 | 30 | ▲ 87.5% |
| February | 20 | 28 | ▲ 40.0% |
| March | 23 | 31 | ▲ 34.8% |
| April | 26 | 28 | ▲ 7.7% |
| May | 31 | 30 | ▼ 3.2% |
| June | 30 | 30 | 0.0% |
| July | 30 | 31 | ▲ 3.3% |
| August | 31 | – | – |
| September | 30 | – | – |
| October | 31 | – | in progress |
| November | 29 | – | – |
| December | 13 | – | – |
| Year to date (Jan–Jul) | 176 | 208 | ▲ 18.2% |
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% | 51.7% | ▼ 31.0% |
| February | 75.0% | 77.8% | ▲ 3.7% |
| March | 82.6% | 83.9% | ▲ 1.5% |
| April | 80.8% | 75.0% | ▼ 7.1% |
| May | 80.7% | 80.0% | ▼ 0.8% |
| June | 73.3% | 76.7% | ▲ 4.6% |
| July | 80.0% | 60.0% | ▼ 25.0% |
| August | 93.6% | – | – |
| September | 80.0% | – | – |
| October | 69.0% | – | in progress |
| November | 62.1% | – | – |
| December | 53.9% | – | – |
| Year-to-date average (Jan–Jul) | 78.2% | 72.1% | ▼ 7.7% |
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 | 1 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 1 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 2 | – | 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 99.1% 574
- Cancelled 0.9% 5
Share of all recorded flights in the period, all legs. · Oct 13, 2024 → Jul 31, 2026
Legs flown under this number
1| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| LAX BOS Los Angeles International Airport – Boston Logan International Airport | 4,193 | 23.5 min | 75.7% | 576 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 17 | 17 | 94.1% | 0 |
| November 2024 | 24 | 24 | 91.7% | 0 |
| December 2024 | 20 | 20 | 65.0% | 0 |
| January 2025 | 16 | 16 | 75.0% | 0 |
| February 2025 | 20 | 20 | 75.0% | 0 |
| March 2025 | 23 | 23 | 82.6% | 0 |
| April 2025 | 26 | 26 | 80.8% | 0 |
| May 2025 | 31 | 31 | 80.7% | 0 |
| June 2025 | 30 | 30 | 73.3% | 0 |
| July 2025 | 30 | 30 | 80.0% | 0 |
| August 2025 | 31 | 31 | 93.6% | 0 |
| September 2025 | 30 | 30 | 80.0% | 0 |
| October 2025 | 31 | 29 | 69.0% | 2 |
| November 2025 | 29 | 29 | 62.1% | 0 |
| December 2025 | 13 | 13 | 53.9% | 0 |
| January 2026 | 30 | 29 | 51.7% | 1 |
| February 2026 | 28 | 27 | 77.8% | 1 |
| March 2026 | 31 | 31 | 83.9% | 0 |
| April 2026 | 28 | 28 | 75.0% | 0 |
| May 2026 | 30 | 30 | 80.0% | 0 |
| June 2026 | 30 | 30 | 76.7% | 0 |
| July 2026 | 31 | 30 | 60.0% | 1 |