WN4375
WN4375 (Southwest Airlines) is a multi-stop service on 16 routes, busiest Los Angeles to Phoenix. Of 312 departures recorded from October 2024 to July 2026, 72.5% left on time, according to the US BTS.
- On-time departures72.5%of 312 flights
- Average delay12.9 min
- July 202626
- Cancelled1.0%
- 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 periods17 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 3 | 1 | ▼ 66.7% |
| February | 2 | – | – |
| March | 26 | 11 | ▼ 57.7% |
| April | 38 | 23 | ▼ 39.5% |
| May | 39 | 25 | ▼ 35.9% |
| June | 6 | 26 | ▲ 333.3% |
| July | – | 26 | – |
| August | 15 | – | – |
| September | 17 | – | – |
| October | 25 | – | in progress |
| November | 3 | – | – |
| December | 4 | – | – |
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 periods17 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 100.0% | 100.0% | 0.0% |
| February | 100.0% | – | – |
| March | 69.2% | 100.0% | ▲ 44.4% |
| April | 84.2% | 91.3% | ▲ 8.4% |
| May | 66.7% | 92.0% | ▲ 38.0% |
| June | 83.3% | 46.2% | ▼ 44.6% |
| July | – | 33.3% | – |
| August | 100.0% | – | – |
| September | 64.7% | – | – |
| October | 36.0% | – | in progress |
| November | 100.0% | – | – |
| December | 75.0% | – | – |
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 periods17 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 0 | – |
| February | 0 | – | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | – | 2 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 1 | – | – |
| 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 99.0% 309
- Cancelled 1.0% 3
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
4| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| LAX PHX Los Angeles International Airport – Phoenix Sky Harbor International Airport | 595 | 12.3 min | 72.4% | 58 |
| GRR MDW Gerald R. Ford International Airport – Chicago Midway International Airport | 220 | -2.7 min | 91.8% | 49 |
| BWI SAV Baltimore/Washington International Thurgood Marshall Airport – Savannah Hilton Head International Airport | 884 | 47.2 min | 36.2% | 49 |
| SNA SMF John Wayne Orange County International Airport – Sacramento International Airport | 650 | 2.3 min | 81.3% | 32 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 100.0% | 0 |
| November 2024 | 1 | 1 | 100.0% | 0 |
| December 2024 | 1 | 1 | 100.0% | 0 |
| January 2025 | 3 | 3 | 100.0% | 0 |
| February 2025 | 2 | 2 | 100.0% | 0 |
| March 2025 | 26 | 26 | 69.2% | 0 |
| April 2025 | 38 | 38 | 84.2% | 0 |
| May 2025 | 39 | 39 | 66.7% | 0 |
| June 2025 | 6 | 6 | 83.3% | 0 |
| August 2025 | 15 | 15 | 100.0% | 0 |
| September 2025 | 17 | 17 | 64.7% | 0 |
| October 2025 | 25 | 25 | 36.0% | 0 |
| November 2025 | 3 | 2 | 100.0% | 1 |
| December 2025 | 4 | 4 | 75.0% | 0 |
| January 2026 | 1 | 1 | 100.0% | 0 |
| March 2026 | 11 | 11 | 100.0% | 0 |
| April 2026 | 23 | 23 | 91.3% | 0 |
| May 2026 | 25 | 25 | 92.0% | 0 |
| June 2026 | 26 | 26 | 46.2% | 0 |
| July 2026 | 26 | 24 | 33.3% | 2 |