WN4455
WN4455 (Southwest Airlines) is a multi-stop service on 17 routes, busiest Seattle to Nashville. Of 309 departures recorded from October 2024 to July 2026, 70.2% left on time, according to the US BTS.
- On-time departures70.2%of 309 flights
- Average delay14.2 min
- July 202618▼ 41.9%vs July 2025
- Cancelled1.3%
- Legs flown under this number17
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 | 1 | 1 | 0.0% |
| February | 8 | 14 | ▲ 75.0% |
| March | 27 | 33 | ▲ 22.2% |
| April | 33 | 10 | ▼ 69.7% |
| May | 34 | 4 | ▼ 88.2% |
| June | 31 | 16 | ▼ 48.4% |
| July | 31 | 18 | ▼ 41.9% |
| August | 4 | – | – |
| September | – | – | – |
| October | 4 | – | in progress |
| November | 4 | – | – |
| December | 2 | – | – |
| Year to date (Jan–Jul) | 165 | 96 | ▼ 41.8% |
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 | 0.0% | 100.0% | – |
| February | 75.0% | 84.6% | ▲ 12.8% |
| March | 88.9% | 100.0% | ▲ 12.5% |
| April | 72.7% | 80.0% | ▲ 10.0% |
| May | 67.7% | 66.7% | ▼ 1.4% |
| June | 58.1% | 31.3% | ▼ 46.2% |
| July | 58.1% | 44.4% | ▼ 23.5% |
| August | 50.0% | – | – |
| September | – | – | – |
| October | 75.0% | – | in progress |
| November | 75.0% | – | – |
| December | 50.0% | – | – |
| Year-to-date average (Jan–Jul) | 60.1% | 72.4% | ▲ 20.6% |
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 | 2 | – |
| April | 0 | 0 | – |
| May | 0 | 1 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | – | – | – |
| 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% 305
- Cancelled 1.3% 4
Share of all recorded flights in the period, all legs. · Oct 13, 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 |
|---|---|---|---|---|
| SEA BNA Seattle–Tacoma International Airport – Nashville International Airport | 3,176 | 25.1 min | 55.7% | 61 |
| BNA MDW Nashville International Airport – Chicago Midway International Airport | 636 | 8.6 min | 74.1% | 58 |
| MCI DAL Kansas City International Airport – Dallas Love Field | 743 | 35.2 min | 38.2% | 34 |
| SJC SNA Mineta San Jose International Airport – John Wayne Orange County International Airport | 550 | -5.1 min | 100.0% | 33 |
| BNA PHL Nashville International Airport – Philadelphia International Airport | 1,084 | 9.6 min | 78.8% | 33 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 16 | 16 | 81.3% | 0 |
| November 2024 | 14 | 14 | 71.4% | 0 |
| December 2024 | 4 | 4 | 75.0% | 0 |
| January 2025 | 1 | 1 | 0.0% | 0 |
| February 2025 | 8 | 8 | 75.0% | 0 |
| March 2025 | 27 | 27 | 88.9% | 0 |
| April 2025 | 33 | 33 | 72.7% | 0 |
| May 2025 | 34 | 34 | 67.7% | 0 |
| June 2025 | 31 | 31 | 58.1% | 0 |
| July 2025 | 31 | 31 | 58.1% | 0 |
| August 2025 | 4 | 4 | 50.0% | 0 |
| October 2025 | 4 | 4 | 75.0% | 0 |
| November 2025 | 4 | 4 | 75.0% | 0 |
| December 2025 | 2 | 2 | 50.0% | 0 |
| January 2026 | 1 | 1 | 100.0% | 0 |
| February 2026 | 14 | 13 | 84.6% | 1 |
| March 2026 | 33 | 31 | 100.0% | 2 |
| April 2026 | 10 | 10 | 80.0% | 0 |
| May 2026 | 4 | 3 | 66.7% | 1 |
| June 2026 | 16 | 16 | 31.3% | 0 |
| July 2026 | 18 | 18 | 44.4% | 0 |