DL637
DL637 (Delta Air Lines) is a multi-stop service on 11 routes, busiest West Palm Beach to Boston. Of 641 departures recorded from October 2024 to July 2026, 77.2% left on time, according to the US BTS.
- On-time departures77.2%of 641 flights
- Average delay15.8 min
- July 202656▲ 833.3%vs July 2025
- Cancelled0.9%
- Legs flown under this number11
according to the US BTS · Oct 12, 2024 → Jul 31, 2026 domestic flights only
Recorded departures by month
Partial coverage: domestic flights only · 22 of 22 periods have data
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 | 22 | 13 | ▼ 40.9% |
| February | 22 | 10 | ▼ 54.5% |
| March | 26 | 44 | ▲ 69.2% |
| April | 26 | 56 | ▲ 115.4% |
| May | 30 | 60 | ▲ 100.0% |
| June | 13 | 57 | ▲ 338.5% |
| July | 6 | 56 | ▲ 833.3% |
| August | 25 | – | – |
| September | 30 | – | – |
| October | 31 | – | in progress |
| November | 29 | – | – |
| December | 19 | – | – |
| Year to date (Jan–Jul) | 145 | 296 | ▲ 104.1% |
according to the US BTS · October 2024 → July 2026
On-time departures by month
Partial coverage: domestic flights only · 22 of 22 periods have data
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 | 86.4% | 92.3% | ▲ 6.9% |
| February | 95.5% | 100.0% | ▲ 4.8% |
| March | 96.2% | 73.8% | ▼ 23.2% |
| April | 65.4% | 78.6% | ▲ 20.2% |
| May | 93.3% | 80.0% | ▼ 14.3% |
| June | 61.5% | 96.2% | ▲ 56.4% |
| July | 100.0% | 73.2% | ▼ 26.8% |
| August | 72.0% | – | – |
| September | 50.0% | – | – |
| October | 48.4% | – | in progress |
| November | 55.2% | – | – |
| December | 52.6% | – | – |
| Year-to-date average (Jan–Jul) | 85.5% | 84.9% | ▼ 0.7% |
according to the US BTS · October 2024 → July 2026
Average departure delay by month
Partial coverage: domestic flights only · 22 of 22 periods have data
according to the US BTS · October 2024 → July 2026
Cancelled departures by month
Partial coverage: domestic flights only · 22 of 22 periods have data
The most recent periods19 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 0 | – |
| February | 0 | 0 | – |
| March | 0 | 2 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 4 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 0 | 6 |
according to the US BTS · October 2024 → July 2026
This is not a forecast
This is a historical record of departures already flown, not a forecast for your flight.
This number flies several legs
Several legs: the headline figure averages all of them. See the leg table.
Cancellation share
- Not cancelled 99.1% 635
- Cancelled 0.9% 6
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
88 of 8
| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| DJT BOS President Donald J. Trump International Airport – Boston Logan International Airport | 1,929 | 45.6 min | 54.6% | 130 |
| SEA ORD Seattle–Tacoma International Airport – Chicago O'Hare International Airport | 2,762 | 8.5 min | 84.8% | 107 |
| SEA SNA Seattle–Tacoma International Airport – John Wayne Orange County International Airport | 1,576 | 7.0 min | 86.1% | 101 |
| ORD SEA Chicago O'Hare International Airport – Seattle–Tacoma International Airport | 2,762 | 12.7 min | 79.2% | 98 |
| ATL DCA Hartsfield Jackson Atlanta International Airport – Ronald Reagan Washington National Airport | 880 | 2.7 min | 83.3% | 66 |
| CHA ATL Chattanooga Metropolitan Airport (Lovell Field) – Hartsfield Jackson Atlanta International Airport | 171 | 23.8 min | 66.7% | 34 |
| ATL CHA Hartsfield Jackson Atlanta International Airport – Chattanooga Metropolitan Airport (Lovell Field) | 171 | 7.8 min | 84.9% | 34 |
| SFO JFK San Francisco International Airport – John F. Kennedy International Airport | 4,152 | 2.8 min | 87.5% | 32 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 19 | 19 | 100.0% | 0 |
| November 2024 | 29 | 29 | 69.0% | 0 |
| December 2024 | 18 | 18 | 88.9% | 0 |
| January 2025 | 22 | 22 | 86.4% | 0 |
| February 2025 | 22 | 22 | 95.5% | 0 |
| March 2025 | 26 | 26 | 96.2% | 0 |
| April 2025 | 26 | 26 | 65.4% | 0 |
| May 2025 | 30 | 30 | 93.3% | 0 |
| June 2025 | 13 | 13 | 61.5% | 0 |
| July 2025 | 6 | 6 | 100.0% | 0 |
| August 2025 | 25 | 25 | 72.0% | 0 |
| September 2025 | 30 | 30 | 50.0% | 0 |
| October 2025 | 31 | 31 | 48.4% | 0 |
| November 2025 | 29 | 29 | 55.2% | 0 |
| December 2025 | 19 | 19 | 52.6% | 0 |
| January 2026 | 13 | 13 | 92.3% | 0 |
| February 2026 | 10 | 10 | 100.0% | 0 |
| March 2026 | 44 | 42 | 73.8% | 2 |
| April 2026 | 56 | 56 | 78.6% | 0 |
| May 2026 | 60 | 60 | 80.0% | 0 |
| June 2026 | 57 | 53 | 96.2% | 4 |
| July 2026 | 56 | 56 | 73.2% | 0 |