WN4422
WN4422 (Southwest Airlines) is a multi-stop service on 20 routes, busiest St Louis to Chicago. Of 439 departures recorded from October 2024 to July 2026, 78.4% left on time, according to the US BTS.
- On-time departures78.4%of 439 flights
- Average delay11.7 min
- July 202623▼ 20.7%vs July 2025
- Cancelled0.9%
- Legs flown under this number20
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 | 4 | 27 | ▲ 575.0% |
| February | 8 | 17 | ▲ 112.5% |
| March | 21 | 30 | ▲ 42.9% |
| April | 28 | 15 | ▼ 46.4% |
| May | 31 | 14 | ▼ 54.8% |
| June | 32 | 19 | ▼ 40.6% |
| July | 29 | 23 | ▼ 20.7% |
| August | 25 | – | – |
| September | 21 | – | – |
| October | – | – | in progress |
| November | 23 | – | – |
| December | 28 | – | – |
| Year to date (Jan–Jul) | 153 | 145 | ▼ 5.2% |
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 | 100.0% | 63.0% | ▼ 37.0% |
| February | 62.5% | 62.5% | 0.0% |
| March | 61.9% | 50.0% | ▼ 19.2% |
| April | 75.0% | 60.0% | ▼ 20.0% |
| May | 60.0% | 71.4% | ▲ 19.1% |
| June | 93.8% | 94.7% | ▲ 1.1% |
| July | 86.2% | 100.0% | ▲ 16.0% |
| August | 92.0% | – | – |
| September | 100.0% | – | – |
| October | – | – | in progress |
| November | 90.9% | – | – |
| December | 89.3% | – | – |
| Year-to-date average (Jan–Jul) | 77.1% | 71.7% | ▼ 7.0% |
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 | 0 | – |
| February | 0 | 1 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 1 | 0 | ▼ 100.0% |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | – | – | in progress |
| November | 1 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 1 | 1 | 0.0% |
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 99.1% 435
- Cancelled 0.9% 4
Share of all recorded flights in the period, all legs. · Oct 15, 2024 → Jul 31, 2026
On time, leg by leg
Departures within 15 minutes of schedule; small figure = departures recorded.
Legs flown under this number
8| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| STL MDW St. Louis Lambert International Airport – Chicago Midway International Airport | 404 | 12.2 min | 71.9% | 58 |
| SBA LAS Santa Barbara Municipal Airport – Harry Reid International Airport | 464 | -2.2 min | 97.6% | 42 |
| BWI BOS Baltimore/Washington International Thurgood Marshall Airport – Boston Logan International Airport | 594 | 19.3 min | 60.0% | 41 |
| STL BWI St. Louis Lambert International Airport – Baltimore/Washington International Thurgood Marshall Airport | 1,185 | 0.9 min | 95.0% | 40 |
| DAL PHX Dallas Love Field – Phoenix Sky Harbor International Airport | 1,412 | -2.0 min | 100.0% | 40 |
| STL BOS St. Louis Lambert International Airport – Boston Logan International Airport | 1,680 | 12.2 min | 74.3% | 36 |
| SAN STL San Diego International Airport – St. Louis Lambert International Airport | 2,501 | 14.3 min | 86.1% | 36 |
| SEA SAN Seattle–Tacoma International Airport – San Diego International Airport | 1,692 | 29.6 min | 48.5% | 33 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 6 | 6 | 100.0% | 0 |
| November 2024 | 19 | 19 | 84.2% | 0 |
| December 2024 | 19 | 18 | 66.7% | 1 |
| January 2025 | 4 | 4 | 100.0% | 0 |
| February 2025 | 8 | 8 | 62.5% | 0 |
| March 2025 | 21 | 21 | 61.9% | 0 |
| April 2025 | 28 | 28 | 75.0% | 0 |
| May 2025 | 31 | 30 | 60.0% | 1 |
| June 2025 | 32 | 32 | 93.8% | 0 |
| July 2025 | 29 | 29 | 86.2% | 0 |
| August 2025 | 25 | 25 | 92.0% | 0 |
| September 2025 | 21 | 21 | 100.0% | 0 |
| November 2025 | 23 | 22 | 90.9% | 1 |
| December 2025 | 28 | 28 | 89.3% | 0 |
| January 2026 | 27 | 27 | 63.0% | 0 |
| February 2026 | 17 | 16 | 62.5% | 1 |
| March 2026 | 30 | 30 | 50.0% | 0 |
| April 2026 | 15 | 15 | 60.0% | 0 |
| May 2026 | 14 | 14 | 71.4% | 0 |
| June 2026 | 19 | 19 | 94.7% | 0 |
| July 2026 | 23 | 23 | 100.0% | 0 |