WN4228
WN4228 (Southwest Airlines) is a multi-stop service on 17 routes, busiest San Francisco to Burbank. Of 358 departures recorded from November 2024 to July 2026, 63.6% left on time, according to the US BTS.
- On-time departures63.6%of 358 flights
- Average delay21.0 min
- July 202630▲ 50.0%vs July 2025
- Cancelled1.7%
- Legs flown under this number17
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 | 8 | 26 | ▲ 225.0% |
| February | 33 | 33 | 0.0% |
| March | 5 | 5 | 0.0% |
| April | 12 | 21 | ▲ 75.0% |
| May | 6 | 25 | ▲ 316.7% |
| June | 21 | 30 | ▲ 42.9% |
| July | 20 | 30 | ▲ 50.0% |
| August | 18 | – | – |
| September | 17 | – | – |
| October | – | – | in progress |
| November | 8 | – | – |
| December | 13 | – | – |
| Year to date (Jan–Jul) | 105 | 170 | ▲ 61.9% |
according to the US BTS · November 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 | 85.7% | 84.0% | ▼ 2.0% |
| February | 72.7% | 80.7% | ▲ 10.9% |
| March | 40.0% | 80.0% | ▲ 100.0% |
| April | 54.6% | 85.7% | ▲ 57.1% |
| May | 50.0% | 80.0% | ▲ 60.0% |
| June | 52.4% | 24.1% | ▼ 53.9% |
| July | 55.0% | 50.0% | ▼ 9.1% |
| August | 61.1% | – | – |
| September | 41.2% | – | – |
| October | – | – | in progress |
| November | 87.5% | – | – |
| December | 53.9% | – | – |
| Year-to-date average (Jan–Jul) | 58.6% | 69.2% | ▲ 18.1% |
according to the US BTS · November 2024 → July 2026
Average departure delay by month
Months without data are left blank.
according to the US BTS · November 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 | 1 | 1 | 0.0% |
| February | 0 | 2 | – |
| March | 0 | 0 | – |
| April | 1 | 0 | ▼ 100.0% |
| May | 0 | 0 | – |
| June | 0 | 1 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | – | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 2 | 4 | ▲ 100.0% |
according to the US BTS · November 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 98.3% 352
- Cancelled 1.7% 6
Share of all recorded flights in the period, all legs. · Nov 3, 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 |
|---|---|---|---|---|
| SFO BUR San Francisco International Airport – Hollywood Burbank/Bob Hope Airport | 525 | 39.7 min | 33.9% | 57 |
| TPA BWI Tampa International Airport – Baltimore/Washington International Thurgood Marshall Airport | 1,358 | 7.7 min | 87.2% | 49 |
| SJC BUR Mineta San Jose International Airport – Hollywood Burbank/Bob Hope Airport | 477 | 6.5 min | 83.7% | 49 |
| SAV STL Savannah Hilton Head International Airport – St. Louis Lambert International Airport | 1,109 | 20.4 min | 56.8% | 44 |
| SAN SMF San Diego International Airport – Sacramento International Airport | 773 | 28.9 min | 48.4% | 31 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| November 2024 | 15 | 15 | 80.0% | 0 |
| December 2024 | 12 | 12 | 58.3% | 0 |
| January 2025 | 8 | 7 | 85.7% | 1 |
| February 2025 | 33 | 33 | 72.7% | 0 |
| March 2025 | 5 | 5 | 40.0% | 0 |
| April 2025 | 12 | 11 | 54.6% | 1 |
| May 2025 | 6 | 6 | 50.0% | 0 |
| June 2025 | 21 | 21 | 52.4% | 0 |
| July 2025 | 20 | 20 | 55.0% | 0 |
| August 2025 | 18 | 18 | 61.1% | 0 |
| September 2025 | 17 | 17 | 41.2% | 0 |
| November 2025 | 8 | 8 | 87.5% | 0 |
| December 2025 | 13 | 13 | 53.9% | 0 |
| January 2026 | 26 | 25 | 84.0% | 1 |
| February 2026 | 33 | 31 | 80.7% | 2 |
| March 2026 | 5 | 5 | 80.0% | 0 |
| April 2026 | 21 | 21 | 85.7% | 0 |
| May 2026 | 25 | 25 | 80.0% | 0 |
| June 2026 | 30 | 29 | 24.1% | 1 |
| July 2026 | 30 | 30 | 50.0% | 0 |