WN4037
WN4037 (Southwest Airlines) is a multi-stop service on 16 routes, busiest New York to St Louis. Of 357 departures recorded from October 2024 to July 2026, 64.8% left on time, according to the US BTS.
- On-time departures64.8%of 357 flights
- Average delay21.9 min
- July 202614
- Cancelled0.6%
- Legs flown under this number16
Recorded departures by month
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods18 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 26 | 4 | ▼ 84.6% |
| February | 26 | 2 | ▼ 92.3% |
| March | 5 | 1 | ▼ 80.0% |
| April | 12 | 32 | ▲ 166.7% |
| May | 19 | 38 | ▲ 100.0% |
| June | 1 | 17 | ▲ 1,600.0% |
| July | – | 14 | – |
| August | 26 | – | – |
| September | 30 | – | – |
| October | 20 | – | in progress |
| November | 6 | – | – |
| December | 13 | – | – |
according to the US BTS · October 2024 → July 2026
On-time departures by month
Months without data are left blank.
On time = departure within 15 minutes of schedule. Non-cancelled flights with a recorded delay only.
The most recent periods18 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 72.0% | 50.0% | ▼ 30.6% |
| February | 84.6% | 50.0% | ▼ 40.9% |
| March | 80.0% | 0.0% | ▼ 100.0% |
| April | 66.7% | 71.9% | ▲ 7.8% |
| May | 63.2% | 57.9% | ▼ 8.3% |
| June | 0.0% | 62.5% | – |
| July | – | 71.4% | – |
| August | 50.0% | – | – |
| September | 56.7% | – | – |
| October | 95.0% | – | in progress |
| November | 83.3% | – | – |
| December | 30.8% | – | – |
according to the US BTS · October 2024 → July 2026
Average departure delay by month
Months without data are left blank.
according to the US BTS · October 2024 → July 2026
Cancelled departures by month
Months without data are left blank.
The most recent periods18 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 1 | 0 | ▼ 100.0% |
| February | 0 | 0 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 1 | – |
| July | – | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
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% 355
- Cancelled 0.6% 2
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
3| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| LGA STL LaGuardia Airport – St. Louis Lambert International Airport | 1,426 | 18.7 min | 67.7% | 97 |
| PHX DEN Phoenix Sky Harbor International Airport – Denver International Airport | 968 | 43.4 min | 54.4% | 57 |
| RSW CMH Southwest Florida International Airport – John Glenn Columbus International Airport | 1,501 | 19.2 min | 68.0% | 50 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 75.0% | 0 |
| November 2024 | 25 | 25 | 60.0% | 0 |
| December 2024 | 20 | 20 | 50.0% | 0 |
| January 2025 | 26 | 25 | 72.0% | 1 |
| February 2025 | 26 | 26 | 84.6% | 0 |
| March 2025 | 5 | 5 | 80.0% | 0 |
| April 2025 | 12 | 12 | 66.7% | 0 |
| May 2025 | 19 | 19 | 63.2% | 0 |
| June 2025 | 1 | 1 | 0.0% | 0 |
| August 2025 | 26 | 26 | 50.0% | 0 |
| September 2025 | 30 | 30 | 56.7% | 0 |
| October 2025 | 20 | 20 | 95.0% | 0 |
| November 2025 | 6 | 6 | 83.3% | 0 |
| December 2025 | 13 | 13 | 30.8% | 0 |
| January 2026 | 4 | 4 | 50.0% | 0 |
| February 2026 | 2 | 2 | 50.0% | 0 |
| March 2026 | 1 | 1 | 0.0% | 0 |
| April 2026 | 32 | 32 | 71.9% | 0 |
| May 2026 | 38 | 38 | 57.9% | 0 |
| June 2026 | 17 | 16 | 62.5% | 1 |
| July 2026 | 14 | 14 | 71.4% | 0 |