WN4504
WN4504 (Southwest Airlines) is a multi-stop service on 20 routes, busiest Austin to Oakland. Of 467 departures recorded from October 2024 to July 2026, 81.6% left on time, according to the US BTS.
- On-time departures81.6%of 467 flights
- Average delay9.2 min
- July 202630▲ 36.4%vs July 2025
- Cancelled0.2%
- Legs flown under this number20
according to the US BTS · Oct 12, 2024 → Jul 31, 2026 domestic flights only
Recorded departures by month
Partial coverage: domestic flights only · 22 of 22 periods have data
All legs under this number combined; see the leg table.
The most recent periods19 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 27 | 12 | ▼ 55.6% |
| February | 32 | 19 | ▼ 40.6% |
| March | 7 | 40 | ▲ 471.4% |
| April | 6 | 21 | ▲ 250.0% |
| May | 6 | 18 | ▲ 200.0% |
| June | 20 | 28 | ▲ 40.0% |
| July | 22 | 30 | ▲ 36.4% |
| August | 29 | – | – |
| September | 30 | – | – |
| October | 15 | – | in progress |
| November | 36 | – | – |
| December | 24 | – | – |
| Year to date (Jan–Jul) | 120 | 168 | ▲ 40.0% |
according to the US BTS · October 2024 → July 2026
On-time departures by month
Partial coverage: domestic flights only · 22 of 22 periods have data
On time = departure within 15 minutes of schedule. Non-cancelled flights with a recorded delay only.
The most recent periods19 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 74.1% | 75.0% | ▲ 1.3% |
| February | 78.1% | 94.7% | ▲ 21.3% |
| March | 71.4% | 67.5% | ▼ 5.5% |
| April | 100.0% | 66.7% | ▼ 33.3% |
| May | 83.3% | 66.7% | ▼ 20.0% |
| June | 90.0% | 89.3% | ▼ 0.8% |
| July | 81.0% | 100.0% | ▲ 23.5% |
| August | 89.7% | – | – |
| September | 96.7% | – | – |
| October | 93.3% | – | in progress |
| November | 72.2% | – | – |
| December | 79.2% | – | – |
| Year-to-date average (Jan–Jul) | 82.6% | 80.0% | ▼ 3.1% |
according to the US BTS · October 2024 → July 2026
Average departure delay by month
Partial coverage: domestic flights only · 22 of 22 periods have data
according to the US BTS · October 2024 → July 2026
Cancelled departures by month
Partial coverage: domestic flights only · 22 of 22 periods have data
The most recent periods19 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 | 1 | 0 | ▼ 100.0% |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 1 | 0 | ▼ 100.0% |
according to the US BTS · October 2024 → July 2026
This is not a forecast
This is a historical record of departures already flown, not a forecast for your flight.
This number flies several legs
Several legs: the headline figure averages all of them. See the leg table.
Cancellation share
- Not cancelled 99.8% 466
- Cancelled 0.2% 1
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
88 of 8
| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| AUS OAK Austin Bergstrom International Airport – Oakland San Francisco Bay Airport | 2,406 | 10.5 min | 73.7% | 76 |
| MCI STL Kansas City International Airport – St. Louis Lambert International Airport | 380 | -0.5 min | 94.8% | 58 |
| OMA MDW Eppley Airfield – Chicago Midway International Airport | 679 | 1.7 min | 94.7% | 57 |
| SJC LAX Mineta San Jose International Airport – Los Angeles International Airport | 496 | 7.5 min | 82.9% | 42 |
| BUF MDW Buffalo Niagara International Airport – Chicago Midway International Airport | 752 | 10.5 min | 78.6% | 42 |
| SNA DEN John Wayne Orange County International Airport – Denver International Airport | 1,360 | 15.9 min | 57.6% | 33 |
| STL PHL St. Louis Lambert International Airport – Philadelphia International Airport | 1,306 | 23.8 min | 71.0% | 31 |
| STL MCO St. Louis Lambert International Airport – Orlando International Airport | 1,420 | 17.0 min | 83.3% | 30 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 12 | 12 | 100.0% | 0 |
| November 2024 | 15 | 15 | 86.7% | 0 |
| December 2024 | 18 | 18 | 55.6% | 0 |
| January 2025 | 27 | 27 | 74.1% | 0 |
| February 2025 | 32 | 32 | 78.1% | 0 |
| March 2025 | 7 | 7 | 71.4% | 0 |
| April 2025 | 6 | 6 | 100.0% | 0 |
| May 2025 | 6 | 6 | 83.3% | 0 |
| June 2025 | 20 | 20 | 90.0% | 0 |
| July 2025 | 22 | 21 | 81.0% | 1 |
| August 2025 | 29 | 29 | 89.7% | 0 |
| September 2025 | 30 | 30 | 96.7% | 0 |
| October 2025 | 15 | 15 | 93.3% | 0 |
| November 2025 | 36 | 36 | 72.2% | 0 |
| December 2025 | 24 | 24 | 79.2% | 0 |
| January 2026 | 12 | 12 | 75.0% | 0 |
| February 2026 | 19 | 19 | 94.7% | 0 |
| March 2026 | 40 | 40 | 67.5% | 0 |
| April 2026 | 21 | 21 | 66.7% | 0 |
| May 2026 | 18 | 18 | 66.7% | 0 |
| June 2026 | 28 | 28 | 89.3% | 0 |
| July 2026 | 30 | 30 | 100.0% | 0 |