WN639
WN639 (Southwest Airlines) is a multi-stop service on 20 routes, busiest Atlanta to New York. Of 635 departures recorded from October 2024 to July 2026, 74.9% left on time, according to the US BTS.
- On-time departures74.9%of 635 flights
- Average delay10.7 min
- July 202631▼ 6.1%vs July 2025
- Cancelled0.2%
- Legs flown under this number20
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 | 28 | 25 | ▼ 10.7% |
| February | 26 | 20 | ▼ 23.1% |
| March | 19 | 30 | ▲ 57.9% |
| April | 27 | 30 | ▲ 11.1% |
| May | 31 | 31 | 0.0% |
| June | 36 | 30 | ▼ 16.7% |
| July | 33 | 31 | ▼ 6.1% |
| August | 40 | – | – |
| September | 39 | – | – |
| October | 27 | – | in progress |
| November | 28 | – | – |
| December | 29 | – | – |
| Year to date (Jan–Jul) | 200 | 197 | ▼ 1.5% |
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 | 89.3% | 64.0% | ▼ 28.3% |
| February | 80.8% | 70.0% | ▼ 13.3% |
| March | 84.2% | 80.0% | ▼ 5.0% |
| April | 88.9% | 86.7% | ▼ 2.5% |
| May | 100.0% | 74.2% | ▼ 25.8% |
| June | 66.7% | 53.3% | ▼ 20.0% |
| July | 45.5% | 32.3% | ▼ 29.0% |
| August | 69.2% | – | – |
| September | 71.8% | – | – |
| October | 100.0% | – | in progress |
| November | 78.6% | – | – |
| December | 72.4% | – | – |
| Year-to-date average (Jan–Jul) | 79.3% | 65.8% | ▼ 17.1% |
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 | 0 | – |
| 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 | 0 |
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 99.8% 634
- Cancelled 0.2% 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
88 of 8
| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| ATL LGA Hartsfield Jackson Atlanta International Airport – LaGuardia Airport | 1,225 | 3.0 min | 87.0% | 115 |
| BNA PHX Nashville International Airport – Phoenix Sky Harbor International Airport | 2,326 | 23.9 min | 41.4% | 58 |
| BNA FLL Nashville International Airport – Fort Lauderdale Hollywood International Airport | 1,278 | 8.7 min | 79.3% | 58 |
| ALB BWI Albany International Airport – Baltimore/Washington International Thurgood Marshall Airport | 464 | -4.1 min | 98.3% | 58 |
| AUS BOS Austin Bergstrom International Airport – Boston Logan International Airport | 2,729 | 12.6 min | 76.0% | 50 |
| MCO PIT Orlando International Airport – Pittsburgh International Airport | 1,345 | 11.3 min | 65.9% | 44 |
| BWI LAX Baltimore/Washington International Thurgood Marshall Airport – Los Angeles International Airport | 3,740 | 8.2 min | 81.8% | 33 |
| AUS LGB Austin Bergstrom International Airport – Long Beach International Airport | 1,970 | 6.2 min | 80.7% | 31 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 14 | 14 | 85.7% | 0 |
| November 2024 | 30 | 30 | 90.0% | 0 |
| December 2024 | 31 | 31 | 83.9% | 0 |
| January 2025 | 28 | 28 | 89.3% | 0 |
| February 2025 | 26 | 26 | 80.8% | 0 |
| March 2025 | 19 | 19 | 84.2% | 0 |
| April 2025 | 27 | 27 | 88.9% | 0 |
| May 2025 | 31 | 31 | 100.0% | 0 |
| June 2025 | 36 | 36 | 66.7% | 0 |
| July 2025 | 33 | 33 | 45.5% | 0 |
| August 2025 | 40 | 39 | 69.2% | 1 |
| September 2025 | 39 | 39 | 71.8% | 0 |
| October 2025 | 27 | 27 | 100.0% | 0 |
| November 2025 | 28 | 28 | 78.6% | 0 |
| December 2025 | 29 | 29 | 72.4% | 0 |
| January 2026 | 25 | 25 | 64.0% | 0 |
| February 2026 | 20 | 20 | 70.0% | 0 |
| March 2026 | 30 | 30 | 80.0% | 0 |
| April 2026 | 30 | 30 | 86.7% | 0 |
| May 2026 | 31 | 31 | 74.2% | 0 |
| June 2026 | 30 | 30 | 53.3% | 0 |
| July 2026 | 31 | 31 | 32.3% | 0 |