WN4356
WN4356 (Southwest Airlines) is a multi-stop service on 23 routes, busiest Chicago to Louisville. Of 362 departures recorded from October 2024 to July 2026, 75.9% left on time, according to the US BTS.
- On-time departures75.9%of 362 flights
- Average delay10.6 min
- July 202626▲ 30.0%vs July 2025
- Cancelled0.3%
- Legs flown under this number23
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 | 14 | 29 | ▲ 107.1% |
| February | 12 | 28 | ▲ 133.3% |
| March | 18 | 12 | ▼ 33.3% |
| April | 7 | 5 | ▼ 28.6% |
| May | 3 | 5 | ▲ 66.7% |
| June | 21 | 23 | ▲ 9.5% |
| July | 20 | 26 | ▲ 30.0% |
| August | 19 | – | – |
| September | 17 | – | – |
| October | – | – | in progress |
| November | 9 | – | – |
| December | 13 | – | – |
| Year to date (Jan–Jul) | 95 | 128 | ▲ 34.7% |
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 | 76.9% | 89.7% | ▲ 16.6% |
| February | 66.7% | 75.0% | ▲ 12.5% |
| March | 77.8% | 41.7% | ▼ 46.4% |
| April | 57.1% | 20.0% | ▼ 65.0% |
| May | 66.7% | 60.0% | ▼ 10.0% |
| June | 76.2% | 82.6% | ▲ 8.4% |
| July | 65.0% | 92.3% | ▲ 42.0% |
| August | 79.0% | – | – |
| September | 88.2% | – | – |
| October | – | – | in progress |
| November | 77.8% | – | – |
| December | 53.9% | – | – |
| Year-to-date average (Jan–Jul) | 69.5% | 65.9% | ▼ 5.2% |
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 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | – | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 1 | 0 | ▼ 100.0% |
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 99.7% 361
- Cancelled 0.3% 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
3| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| MDW SDF Chicago Midway International Airport – Louisville Muhammad Ali International Airport | 437 | 9.7 min | 72.7% | 67 |
| PHX MCI Phoenix Sky Harbor International Airport – Kansas City International Airport | 1,677 | 8.9 min | 77.6% | 58 |
| SAN SMF San Diego International Airport – Sacramento International Airport | 773 | 3.0 min | 87.8% | 49 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 23 | 23 | 95.7% | 0 |
| November 2024 | 28 | 28 | 82.1% | 0 |
| December 2024 | 30 | 30 | 63.3% | 0 |
| January 2025 | 14 | 13 | 76.9% | 1 |
| February 2025 | 12 | 12 | 66.7% | 0 |
| March 2025 | 18 | 18 | 77.8% | 0 |
| April 2025 | 7 | 7 | 57.1% | 0 |
| May 2025 | 3 | 3 | 66.7% | 0 |
| June 2025 | 21 | 21 | 76.2% | 0 |
| July 2025 | 20 | 20 | 65.0% | 0 |
| August 2025 | 19 | 19 | 79.0% | 0 |
| September 2025 | 17 | 17 | 88.2% | 0 |
| November 2025 | 9 | 9 | 77.8% | 0 |
| December 2025 | 13 | 13 | 53.9% | 0 |
| January 2026 | 29 | 29 | 89.7% | 0 |
| February 2026 | 28 | 28 | 75.0% | 0 |
| March 2026 | 12 | 12 | 41.7% | 0 |
| April 2026 | 5 | 5 | 20.0% | 0 |
| May 2026 | 5 | 5 | 60.0% | 0 |
| June 2026 | 23 | 23 | 82.6% | 0 |
| July 2026 | 26 | 26 | 92.3% | 0 |