WN4204
WN4204 (Southwest Airlines) is a multi-stop service on 19 routes, busiest Seattle to Sacramento. Of 264 departures recorded from October 2024 to July 2026, 64.3% left on time, according to the US BTS.
- On-time departures64.3%of 264 flights
- Average delay16.2 min
- July 202612▲ 200.0%vs July 2025
- Cancelled0.4%
- Legs flown under this number19
Recorded departures by month
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods16 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 2 | 5 | ▲ 150.0% |
| February | – | 5 | – |
| March | – | 2 | – |
| April | 23 | 45 | ▲ 95.7% |
| May | 15 | 58 | ▲ 286.7% |
| June | 7 | 17 | ▲ 142.9% |
| July | 4 | 12 | ▲ 200.0% |
| August | 4 | – | – |
| September | 4 | – | – |
| October | – | – | in progress |
| November | 6 | – | – |
| December | 20 | – | – |
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 periods16 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 100.0% | 20.0% | ▼ 80.0% |
| February | – | 80.0% | – |
| March | – | 100.0% | – |
| April | 87.0% | 55.6% | ▼ 36.1% |
| May | 73.3% | 39.7% | ▼ 45.9% |
| June | 57.1% | 94.1% | ▲ 64.7% |
| July | 25.0% | 100.0% | ▲ 300.0% |
| August | 75.0% | – | – |
| September | 50.0% | – | – |
| October | – | – | in progress |
| November | 50.0% | – | – |
| December | 65.0% | – | – |
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 periods16 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 0 | – |
| February | – | 0 | – |
| March | – | 1 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | – | – | 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 99.6% 263
- Cancelled 0.4% 1
Share of all recorded flights in the period, all legs. · Oct 13, 2024 → Jul 29, 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 |
|---|---|---|---|---|
| SEA SMF Seattle–Tacoma International Airport – Sacramento International Airport | 975 | 25.1 min | 39.2% | 51 |
| FLL BWI Fort Lauderdale Hollywood International Airport – Baltimore/Washington International Thurgood Marshall Airport | 1,493 | 9.5 min | 80.5% | 41 |
| DEN SEA Denver International Airport – Seattle–Tacoma International Airport | 1,645 | 13.0 min | 67.7% | 34 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 12 | 12 | 83.3% | 0 |
| November 2024 | 17 | 17 | 76.5% | 0 |
| December 2024 | 6 | 6 | 83.3% | 0 |
| January 2025 | 2 | 2 | 100.0% | 0 |
| April 2025 | 23 | 23 | 87.0% | 0 |
| May 2025 | 15 | 15 | 73.3% | 0 |
| June 2025 | 7 | 7 | 57.1% | 0 |
| July 2025 | 4 | 4 | 25.0% | 0 |
| August 2025 | 4 | 4 | 75.0% | 0 |
| September 2025 | 4 | 4 | 50.0% | 0 |
| November 2025 | 6 | 6 | 50.0% | 0 |
| December 2025 | 20 | 20 | 65.0% | 0 |
| January 2026 | 5 | 5 | 20.0% | 0 |
| February 2026 | 5 | 5 | 80.0% | 0 |
| March 2026 | 2 | 1 | 100.0% | 1 |
| April 2026 | 45 | 45 | 55.6% | 0 |
| May 2026 | 58 | 58 | 39.7% | 0 |
| June 2026 | 17 | 17 | 94.1% | 0 |
| July 2026 | 12 | 12 | 100.0% | 0 |