WN4789
WN4789 (Southwest Airlines) is a multi-stop service on 16 routes, busiest Denver to San Francisco. Of 400 departures recorded from October 2024 to July 2026, 52.4% left on time, according to the US BTS.
- On-time departures52.4%of 400 flights
- Average delay25.4 min
- July 202627
- Cancelled0.3%
- Legs flown under this number16
Recorded departures by month
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods15 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 25 | 30 | ▲ 20.0% |
| February | 24 | 28 | ▲ 16.7% |
| March | 20 | 8 | ▼ 60.0% |
| April | 50 | 1 | ▼ 98.0% |
| May | 62 | – | – |
| June | 8 | 23 | ▲ 187.5% |
| July | – | 27 | – |
| August | – | – | – |
| September | – | – | – |
| October | 26 | – | in progress |
| November | 5 | – | – |
| December | 13 | – | – |
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 periods15 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 68.0% | 70.0% | ▲ 2.9% |
| February | 54.2% | 92.9% | ▲ 71.4% |
| March | 65.0% | 75.0% | ▲ 15.4% |
| April | 44.0% | 100.0% | ▲ 127.3% |
| May | 25.8% | – | – |
| June | 37.5% | 13.0% | ▼ 65.2% |
| July | – | 14.8% | – |
| August | – | – | – |
| September | – | – | – |
| October | 96.2% | – | in progress |
| November | 20.0% | – | – |
| December | 25.0% | – | – |
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 periods15 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 | – |
| August | – | – | – |
| September | – | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 1 | – | – |
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% 399
- Cancelled 0.3% 1
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 |
|---|---|---|---|---|
| DEN SFO Denver International Airport – San Francisco International Airport | 1,553 | 22.3 min | 65.2% | 92 |
| LAS SMF Harry Reid International Airport – Sacramento International Airport | 639 | 28.8 min | 36.2% | 58 |
| DCA LAS Ronald Reagan Washington National Airport – Harry Reid International Airport | 3,354 | 30.8 min | 31.0% | 58 |
| DTW MDW Detroit Metropolitan Wayne County Airport – Chicago Midway International Airport | 367 | 15.1 min | 86.0% | 57 |
| DAL LBB Dallas Love Field – Lubbock Preston Smith International Airport | 472 | 47.7 min | 14.0% | 50 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 10 | 10 | 70.0% | 0 |
| November 2024 | 22 | 22 | 59.1% | 0 |
| December 2024 | 18 | 18 | 83.3% | 0 |
| January 2025 | 25 | 25 | 68.0% | 0 |
| February 2025 | 24 | 24 | 54.2% | 0 |
| March 2025 | 20 | 20 | 65.0% | 0 |
| April 2025 | 50 | 50 | 44.0% | 0 |
| May 2025 | 62 | 62 | 25.8% | 0 |
| June 2025 | 8 | 8 | 37.5% | 0 |
| October 2025 | 26 | 26 | 96.2% | 0 |
| November 2025 | 5 | 5 | 20.0% | 0 |
| December 2025 | 13 | 12 | 25.0% | 1 |
| January 2026 | 30 | 30 | 70.0% | 0 |
| February 2026 | 28 | 28 | 92.9% | 0 |
| March 2026 | 8 | 8 | 75.0% | 0 |
| April 2026 | 1 | 1 | 100.0% | 0 |
| June 2026 | 23 | 23 | 13.0% | 0 |
| July 2026 | 27 | 27 | 14.8% | 0 |