WN4478
WN4478 (Southwest Airlines) is a multi-stop service on 16 routes, busiest Chicago to Charlotte. Of 456 departures recorded from October 2024 to July 2026, 64.2% left on time, according to the US BTS.
- On-time departures64.2%of 456 flights
- Average delay20.7 min
- July 202630▲ 11.1%vs July 2025
- Cancelled1.3%
- Legs flown under this number16
Recorded departures by month
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 | 30 | 3 | ▼ 90.0% |
| February | 24 | 1 | ▼ 95.8% |
| March | 30 | 4 | ▼ 86.7% |
| April | 10 | 35 | ▲ 250.0% |
| May | 3 | 44 | ▲ 1,366.7% |
| June | 23 | 31 | ▲ 34.8% |
| July | 27 | 30 | ▲ 11.1% |
| August | 25 | – | – |
| September | 26 | – | – |
| October | 29 | – | in progress |
| November | 5 | – | – |
| December | 11 | – | – |
| Year to date (Jan–Jul) | 147 | 148 | ▲ 0.7% |
according to the US BTS · October 2024 → July 2026
On-time departures by month
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 | 90.0% | 33.3% | ▼ 63.0% |
| February | 79.2% | 100.0% | ▲ 26.3% |
| March | 73.3% | 33.3% | ▼ 54.5% |
| April | 70.0% | 74.3% | ▲ 6.1% |
| May | 66.7% | 70.5% | ▲ 5.7% |
| June | 39.1% | 38.7% | ▼ 1.1% |
| July | 66.7% | 51.9% | ▼ 22.2% |
| August | 76.0% | – | – |
| September | 41.7% | – | – |
| October | 44.8% | – | in progress |
| November | 100.0% | – | – |
| December | 54.6% | – | – |
| Year-to-date average (Jan–Jul) | 69.3% | 57.4% | ▼ 17.1% |
according to the US BTS · October 2024 → July 2026
Average departure delay by month
according to the US BTS · October 2024 → July 2026
Cancelled departures by month
The most recent periods19 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 0 | – |
| February | 0 | 0 | – |
| March | 0 | 1 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 3 | – |
| August | 0 | – | – |
| September | 2 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 0 | 4 |
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 98.7% 450
- Cancelled 1.3% 6
Share of all recorded flights in the period, all legs. · Oct 31, 2024 → Jul 31, 2026
On time, leg by leg
Departures within 15 minutes of schedule; small figure = departures recorded.
Legs flown under this number
6| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| MDW CLT Chicago Midway International Airport – Charlotte Douglas International Airport | 940 | 13.8 min | 75.5% | 110 |
| MCO DAL Orlando International Airport – Dallas Love Field | 1,564 | 8.7 min | 75.9% | 58 |
| DAL LGA Dallas Love Field – LaGuardia Airport | 2,219 | 49.7 min | 39.6% | 56 |
| SFO DEN San Francisco International Airport – Denver International Airport | 1,553 | 33.3 min | 51.9% | 52 |
| MDW STL Chicago Midway International Airport – St. Louis Lambert International Airport | 404 | 13.0 min | 72.7% | 33 |
| SJC LGB Mineta San Jose International Airport – Long Beach International Airport | 522 | 23.1 min | 46.7% | 30 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 1 | 1 | 100.0% | 0 |
| November 2024 | 27 | 27 | 66.7% | 0 |
| December 2024 | 37 | 37 | 73.0% | 0 |
| January 2025 | 30 | 30 | 90.0% | 0 |
| February 2025 | 24 | 24 | 79.2% | 0 |
| March 2025 | 30 | 30 | 73.3% | 0 |
| April 2025 | 10 | 10 | 70.0% | 0 |
| May 2025 | 3 | 3 | 66.7% | 0 |
| June 2025 | 23 | 23 | 39.1% | 0 |
| July 2025 | 27 | 27 | 66.7% | 0 |
| August 2025 | 25 | 25 | 76.0% | 0 |
| September 2025 | 26 | 24 | 41.7% | 2 |
| October 2025 | 29 | 29 | 44.8% | 0 |
| November 2025 | 5 | 5 | 100.0% | 0 |
| December 2025 | 11 | 11 | 54.6% | 0 |
| January 2026 | 3 | 3 | 33.3% | 0 |
| February 2026 | 1 | 1 | 100.0% | 0 |
| March 2026 | 4 | 3 | 33.3% | 1 |
| April 2026 | 35 | 35 | 74.3% | 0 |
| May 2026 | 44 | 44 | 70.5% | 0 |
| June 2026 | 31 | 31 | 38.7% | 0 |
| July 2026 | 30 | 27 | 51.9% | 3 |