WN4533
WN4533 (Southwest Airlines) is a multi-stop service on 25 routes, busiest Nashville to Philadelphia. Of 479 departures recorded from October 2024 to July 2026, 75.3% left on time, according to the US BTS.
- On-time departures75.3%of 479 flights
- Average delay11.5 min
- July 202627▼ 12.9%vs July 2025
- Cancelled0.2%
- Legs flown under this number25
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 | 28 | 3 | ▼ 89.3% |
| February | 24 | 10 | ▼ 58.3% |
| March | 24 | 17 | ▼ 29.2% |
| April | 5 | 27 | ▲ 440.0% |
| May | – | 30 | – |
| June | 26 | 26 | 0.0% |
| July | 31 | 27 | ▼ 12.9% |
| August | 47 | – | – |
| September | 46 | – | – |
| October | 15 | – | in progress |
| November | 5 | – | – |
| December | 11 | – | – |
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 | 85.7% | 66.7% | ▼ 22.2% |
| February | 75.0% | 50.0% | ▼ 33.3% |
| March | 66.7% | 70.6% | ▲ 5.9% |
| April | 40.0% | 85.2% | ▲ 113.0% |
| May | – | 76.7% | – |
| June | 69.2% | 57.7% | ▼ 16.7% |
| July | 74.2% | 76.9% | ▲ 3.7% |
| August | 66.0% | – | – |
| September | 93.5% | – | – |
| October | 73.3% | – | in progress |
| November | 100.0% | – | – |
| December | 45.5% | – | – |
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 | 0 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | – | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 1 | – |
| 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% 478
- 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 |
|---|---|---|---|---|
| BNA PHL Nashville International Airport – Philadelphia International Airport | 1,084 | 10.0 min | 78.2% | 110 |
| SJU TPA Luis Munoz Marin International Airport – Tampa International Airport | 1,991 | 16.4 min | 68.9% | 61 |
| LAS SMF Harry Reid International Airport – Sacramento International Airport | 639 | 15.8 min | 64.7% | 34 |
| CMH MDW John Glenn Columbus International Airport – Chicago Midway International Airport | 454 | 3.4 min | 84.4% | 32 |
| TPA AUS Tampa International Airport – Austin Bergstrom International Airport | 1,490 | 16.3 min | 67.7% | 31 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 19 | 19 | 94.7% | 0 |
| November 2024 | 27 | 27 | 81.5% | 0 |
| December 2024 | 31 | 31 | 77.4% | 0 |
| January 2025 | 28 | 28 | 85.7% | 0 |
| February 2025 | 24 | 24 | 75.0% | 0 |
| March 2025 | 24 | 24 | 66.7% | 0 |
| April 2025 | 5 | 5 | 40.0% | 0 |
| June 2025 | 26 | 26 | 69.2% | 0 |
| July 2025 | 31 | 31 | 74.2% | 0 |
| August 2025 | 47 | 47 | 66.0% | 0 |
| September 2025 | 46 | 46 | 93.5% | 0 |
| October 2025 | 15 | 15 | 73.3% | 0 |
| November 2025 | 5 | 5 | 100.0% | 0 |
| December 2025 | 11 | 11 | 45.5% | 0 |
| January 2026 | 3 | 3 | 66.7% | 0 |
| February 2026 | 10 | 10 | 50.0% | 0 |
| March 2026 | 17 | 17 | 70.6% | 0 |
| April 2026 | 27 | 27 | 85.2% | 0 |
| May 2026 | 30 | 30 | 76.7% | 0 |
| June 2026 | 26 | 26 | 57.7% | 0 |
| July 2026 | 27 | 26 | 76.9% | 1 |