WN4429
WN4429 (Southwest Airlines) is a multi-stop service on 21 routes, busiest New York to Chicago. Of 447 departures recorded from October 2024 to July 2026, 70.2% left on time, according to the US BTS.
- On-time departures70.2%of 447 flights
- Average delay17.2 min
- July 202626▼ 16.1%vs July 2025
- Cancelled0.2%
- Legs flown under this number21
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 | 8 | 27 | ▲ 237.5% |
| February | 39 | 25 | ▼ 35.9% |
| March | 27 | 21 | ▼ 22.2% |
| April | 6 | 15 | ▲ 150.0% |
| May | – | 14 | – |
| June | 26 | 25 | ▼ 3.8% |
| July | 31 | 26 | ▼ 16.1% |
| August | 42 | – | – |
| September | 43 | – | – |
| October | 5 | – | in progress |
| November | 4 | – | – |
| December | 2 | – | – |
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 | 87.5% | 76.9% | ▼ 12.1% |
| February | 89.7% | 56.0% | ▼ 37.6% |
| March | 88.9% | 38.1% | ▼ 57.1% |
| April | 83.3% | 46.7% | ▼ 44.0% |
| May | – | 50.0% | – |
| June | 61.5% | 20.0% | ▼ 67.5% |
| July | 71.0% | 34.6% | ▼ 51.2% |
| August | 90.5% | – | – |
| September | 90.7% | – | – |
| October | 60.0% | – | in progress |
| November | 75.0% | – | – |
| December | 50.0% | – | – |
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 | 0 | 1 | – |
| February | 0 | 0 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | – | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 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 99.8% 446
- 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
5| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| LGA MDW LaGuardia Airport – Chicago Midway International Airport | 1,164 | 2.8 min | 96.6% | 58 |
| DEN DSM Denver International Airport – Des Moines International Airport | 947 | 12.9 min | 65.5% | 55 |
| STL SAT St. Louis Lambert International Airport – San Antonio International Airport | 1,266 | 25.2 min | 65.4% | 52 |
| DEN BNA Denver International Airport – Nashville International Airport | 1,628 | 52.6 min | 28.6% | 49 |
| BOI DEN Boise Air Terminal/Gowen Field – Denver International Airport | 1,042 | 5.4 min | 89.1% | 46 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 60.0% | 0 |
| November 2024 | 23 | 23 | 91.3% | 0 |
| December 2024 | 18 | 18 | 94.4% | 0 |
| January 2025 | 8 | 8 | 87.5% | 0 |
| February 2025 | 39 | 39 | 89.7% | 0 |
| March 2025 | 27 | 27 | 88.9% | 0 |
| April 2025 | 6 | 6 | 83.3% | 0 |
| June 2025 | 26 | 26 | 61.5% | 0 |
| July 2025 | 31 | 31 | 71.0% | 0 |
| August 2025 | 42 | 42 | 90.5% | 0 |
| September 2025 | 43 | 43 | 90.7% | 0 |
| October 2025 | 5 | 5 | 60.0% | 0 |
| November 2025 | 4 | 4 | 75.0% | 0 |
| December 2025 | 2 | 2 | 50.0% | 0 |
| January 2026 | 27 | 26 | 76.9% | 1 |
| February 2026 | 25 | 25 | 56.0% | 0 |
| March 2026 | 21 | 21 | 38.1% | 0 |
| April 2026 | 15 | 15 | 46.7% | 0 |
| May 2026 | 14 | 14 | 50.0% | 0 |
| June 2026 | 25 | 25 | 20.0% | 0 |
| July 2026 | 26 | 26 | 34.6% | 0 |