WN4503
WN4503 (Southwest Airlines) is a multi-stop service on 24 routes, busiest San Jose to Los Angeles. Of 509 departures recorded from October 2024 to July 2026, 66.5% left on time, according to the US BTS.
- On-time departures66.5%of 509 flights
- Average delay19.6 min
- July 202630▼ 3.2%vs July 2025
- Cancelled1.4%
- Legs flown under this number24
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 | 16 | 47 | ▲ 193.8% |
| February | 29 | 37 | ▲ 27.6% |
| March | 40 | 26 | ▼ 35.0% |
| April | 24 | 15 | ▼ 37.5% |
| May | 17 | 12 | ▼ 29.4% |
| June | 29 | 29 | 0.0% |
| July | 31 | 30 | ▼ 3.2% |
| August | 4 | – | – |
| September | – | – | – |
| October | 17 | – | in progress |
| November | 6 | – | – |
| December | 19 | – | – |
| Year to date (Jan–Jul) | 186 | 196 | ▲ 5.4% |
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 periods18 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 87.5% | 93.6% | ▲ 7.0% |
| February | 75.9% | 97.3% | ▲ 28.3% |
| March | 64.1% | 56.0% | ▼ 12.6% |
| April | 75.0% | 50.0% | ▼ 33.3% |
| May | 94.1% | 54.6% | ▼ 42.0% |
| June | 75.9% | 20.7% | ▼ 72.7% |
| July | 77.4% | 30.0% | ▼ 61.3% |
| August | 100.0% | – | – |
| September | – | – | – |
| October | 70.6% | – | in progress |
| November | 75.0% | – | – |
| December | 47.4% | – | – |
| Year-to-date average (Jan–Jul) | 78.6% | 57.5% | ▼ 26.9% |
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 | 1 | 1 | 0.0% |
| April | 0 | 1 | – |
| May | 0 | 1 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | – | – | – |
| October | 0 | – | in progress |
| November | 2 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 1 | 3 | ▲ 200.0% |
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 98.6% 502
- Cancelled 1.4% 7
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
6| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| SJC LAX Mineta San Jose International Airport – Los Angeles International Airport | 496 | 12.9 min | 78.7% | 61 |
| STL LAS St. Louis Lambert International Airport – Harry Reid International Airport | 2,202 | 1.3 min | 96.6% | 58 |
| OAK LAS Oakland San Francisco Bay Airport – Harry Reid International Airport | 654 | 41.2 min | 26.3% | 57 |
| SAN ABQ San Diego International Airport – Albuquerque International Sunport | 1,009 | 23.1 min | 70.9% | 56 |
| LGA HOU LaGuardia Airport – William P. Hobby Airport | 2,295 | 1.5 min | 94.1% | 34 |
| MDW MSY Chicago Midway International Airport – Louis Armstrong New Orleans International Airport | 1,331 | 30.3 min | 57.6% | 33 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 12 | 12 | 58.3% | 0 |
| November 2024 | 42 | 42 | 59.5% | 0 |
| December 2024 | 27 | 26 | 42.3% | 1 |
| January 2025 | 16 | 16 | 87.5% | 0 |
| February 2025 | 29 | 29 | 75.9% | 0 |
| March 2025 | 40 | 39 | 64.1% | 1 |
| April 2025 | 24 | 24 | 75.0% | 0 |
| May 2025 | 17 | 17 | 94.1% | 0 |
| June 2025 | 29 | 29 | 75.9% | 0 |
| July 2025 | 31 | 31 | 77.4% | 0 |
| August 2025 | 4 | 4 | 100.0% | 0 |
| October 2025 | 17 | 17 | 70.6% | 0 |
| November 2025 | 6 | 4 | 75.0% | 2 |
| December 2025 | 19 | 19 | 47.4% | 0 |
| January 2026 | 47 | 47 | 93.6% | 0 |
| February 2026 | 37 | 37 | 97.3% | 0 |
| March 2026 | 26 | 25 | 56.0% | 1 |
| April 2026 | 15 | 14 | 50.0% | 1 |
| May 2026 | 12 | 11 | 54.6% | 1 |
| June 2026 | 29 | 29 | 20.7% | 0 |
| July 2026 | 30 | 30 | 30.0% | 0 |