WN4019
WN4019 (Southwest Airlines) is a multi-stop service on 25 routes, busiest San Diego to Sacramento. Of 478 departures recorded from October 2024 to July 2026, 76.3% left on time, according to the US BTS.
- On-time departures76.3%of 478 flights
- Average delay10.9 min
- July 202626▼ 57.4%vs July 2025
- Cancelled0.4%
- 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 | 2 | 4 | ▲ 100.0% |
| February | 8 | 1 | ▼ 87.5% |
| March | 27 | 27 | 0.0% |
| April | 32 | 19 | ▼ 40.6% |
| May | 31 | 17 | ▼ 45.2% |
| June | 57 | 20 | ▼ 64.9% |
| July | 61 | 26 | ▼ 57.4% |
| August | 8 | – | – |
| September | – | – | – |
| October | 52 | – | in progress |
| November | 30 | – | – |
| December | 17 | – | – |
| Year to date (Jan–Jul) | 218 | 114 | ▼ 47.7% |
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 | 100.0% | 50.0% | ▼ 50.0% |
| February | 87.5% | 100.0% | ▲ 14.3% |
| March | 85.2% | 85.2% | 0.0% |
| April | 84.4% | 42.1% | ▼ 50.1% |
| May | 67.7% | 23.5% | ▼ 65.3% |
| June | 86.0% | 80.0% | ▼ 6.9% |
| July | 77.1% | 96.2% | ▲ 24.8% |
| August | 87.5% | – | – |
| September | – | – | – |
| October | 70.0% | – | in progress |
| November | 63.3% | – | – |
| December | 64.7% | – | – |
| Year-to-date average (Jan–Jul) | 84.0% | 68.1% | ▼ 18.9% |
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 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | – | – | – |
| October | 2 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 0 | 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% 476
- Cancelled 0.4% 2
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
8| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| SAN SMF San Diego International Airport – Sacramento International Airport | 773 | 10.0 min | 73.1% | 52 |
| PHX SAN Phoenix Sky Harbor International Airport – San Diego International Airport | 489 | -0.0 min | 93.2% | 44 |
| TPA DEN Tampa International Airport – Denver International Airport | 2,423 | 6.3 min | 90.5% | 42 |
| BWI CVG Baltimore/Washington International Thurgood Marshall Airport – Cincinnati Northern Kentucky International Airport | 690 | 17.7 min | 66.7% | 42 |
| MHT BWI Manchester-Boston Regional Airport – Baltimore/Washington International Thurgood Marshall Airport | 606 | 3.5 min | 87.9% | 33 |
| SAN SJC San Diego International Airport – Mineta San Jose International Airport | 671 | 18.2 min | 64.5% | 31 |
| RNO LGB Reno Tahoe International Airport – Long Beach International Airport | 648 | 35.1 min | 19.4% | 31 |
| MSY DAL Louis Armstrong New Orleans International Airport – Dallas Love Field | 700 | 12.3 min | 73.3% | 31 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 17 | 17 | 88.2% | 0 |
| November 2024 | 16 | 16 | 100.0% | 0 |
| December 2024 | 6 | 6 | 83.3% | 0 |
| January 2025 | 2 | 2 | 100.0% | 0 |
| February 2025 | 8 | 8 | 87.5% | 0 |
| March 2025 | 27 | 27 | 85.2% | 0 |
| April 2025 | 32 | 32 | 84.4% | 0 |
| May 2025 | 31 | 31 | 67.7% | 0 |
| June 2025 | 57 | 57 | 86.0% | 0 |
| July 2025 | 61 | 61 | 77.1% | 0 |
| August 2025 | 8 | 8 | 87.5% | 0 |
| October 2025 | 52 | 50 | 70.0% | 2 |
| November 2025 | 30 | 30 | 63.3% | 0 |
| December 2025 | 17 | 17 | 64.7% | 0 |
| January 2026 | 4 | 4 | 50.0% | 0 |
| February 2026 | 1 | 1 | 100.0% | 0 |
| March 2026 | 27 | 27 | 85.2% | 0 |
| April 2026 | 19 | 19 | 42.1% | 0 |
| May 2026 | 17 | 17 | 23.5% | 0 |
| June 2026 | 20 | 20 | 80.0% | 0 |
| July 2026 | 26 | 26 | 96.2% | 0 |