WN4510
WN4510 (Southwest Airlines) is a multi-stop service on 20 routes, busiest Oakland to Long Beach. Of 405 departures recorded from October 2024 to July 2026, 74.2% left on time, according to the US BTS.
- On-time departures74.2%of 405 flights
- Average delay11.6 min
- July 202626▼ 49.0%vs July 2025
- Cancelled0.5%
- Legs flown under this number20
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 | – | 7 | – |
| February | – | – | – |
| March | 16 | 34 | ▲ 112.5% |
| April | 24 | 10 | ▼ 58.3% |
| May | 27 | 4 | ▼ 85.2% |
| June | 41 | 24 | ▼ 41.5% |
| July | 51 | 26 | ▼ 49.0% |
| August | 16 | – | – |
| September | 13 | – | – |
| October | 19 | – | in progress |
| November | 30 | – | – |
| December | 40 | – | – |
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 | – | 71.4% | – |
| February | – | – | – |
| March | 93.8% | 67.7% | ▼ 27.8% |
| April | 87.5% | 100.0% | ▲ 14.3% |
| May | 96.3% | 25.0% | ▼ 74.0% |
| June | 85.4% | 37.5% | ▼ 56.1% |
| July | 86.3% | 19.2% | ▼ 77.7% |
| August | 81.3% | – | – |
| September | 92.3% | – | – |
| October | 50.0% | – | in progress |
| November | 86.7% | – | – |
| 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 | – |
| February | – | – | – |
| March | 0 | 0 | – |
| April | 0 | 1 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 1 | – | 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 99.5% 403
- Cancelled 0.5% 2
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
5| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| OAK LGB Oakland San Francisco Bay Airport – Long Beach International Airport | 569 | 9.6 min | 81.0% | 63 |
| SJC ONT Mineta San Jose International Airport – Ontario International Airport | 536 | -1.9 min | 91.8% | 61 |
| PHX BWI Phoenix Sky Harbor International Airport – Baltimore/Washington International Thurgood Marshall Airport | 3,209 | 5.2 min | 90.0% | 50 |
| PHX SNA Phoenix Sky Harbor International Airport – John Wayne Orange County International Airport | 544 | 34.7 min | 31.0% | 42 |
| SNA OAK John Wayne Orange County International Airport – Oakland San Francisco Bay Airport | 597 | 15.9 min | 75.0% | 33 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 90.0% | 0 |
| November 2024 | 2 | 2 | 100.0% | 0 |
| December 2024 | 1 | 1 | 0.0% | 0 |
| March 2025 | 16 | 16 | 93.8% | 0 |
| April 2025 | 24 | 24 | 87.5% | 0 |
| May 2025 | 27 | 27 | 96.3% | 0 |
| June 2025 | 41 | 41 | 85.4% | 0 |
| July 2025 | 51 | 51 | 86.3% | 0 |
| August 2025 | 16 | 16 | 81.3% | 0 |
| September 2025 | 13 | 13 | 92.3% | 0 |
| October 2025 | 19 | 18 | 50.0% | 1 |
| November 2025 | 30 | 30 | 86.7% | 0 |
| December 2025 | 40 | 40 | 65.0% | 0 |
| January 2026 | 7 | 7 | 71.4% | 0 |
| March 2026 | 34 | 34 | 67.7% | 0 |
| April 2026 | 10 | 9 | 100.0% | 1 |
| May 2026 | 4 | 4 | 25.0% | 0 |
| June 2026 | 24 | 24 | 37.5% | 0 |
| July 2026 | 26 | 26 | 19.2% | 0 |