WN4104
WN4104 (Southwest Airlines) is a multi-stop service on 22 routes, busiest San Francisco to San Diego. Of 316 departures recorded from October 2024 to July 2026, 64.2% left on time, according to the US BTS.
- On-time departures64.2%of 316 flights
- Average delay17.8 min
- July 202621
- Cancelled0.0%
- Legs flown under this number22
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 | 24 | 1 | ▼ 95.8% |
| February | 18 | 6 | ▼ 66.7% |
| March | 4 | 24 | ▲ 500.0% |
| April | 23 | 29 | ▲ 26.1% |
| May | 31 | 31 | 0.0% |
| June | 4 | 23 | ▲ 475.0% |
| July | – | 21 | – |
| August | 12 | – | – |
| September | 13 | – | – |
| October | 14 | – | in progress |
| November | 3 | – | – |
| December | 2 | – | – |
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 | 70.8% | 100.0% | ▲ 41.2% |
| February | 66.7% | 83.3% | ▲ 25.0% |
| March | 50.0% | 95.8% | ▲ 91.7% |
| April | 47.8% | 24.1% | ▼ 49.5% |
| May | 54.8% | 12.9% | ▼ 76.5% |
| June | 100.0% | 73.9% | ▼ 26.1% |
| July | – | 81.0% | – |
| August | 75.0% | – | – |
| September | 100.0% | – | – |
| October | 100.0% | – | in progress |
| November | 100.0% | – | – |
| December | 100.0% | – | – |
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 periods18 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 | – | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | 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 100.0% 316
- Cancelled 0.0% 0
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
3| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| SFO SAN San Francisco International Airport – San Diego International Airport | 719 | 52.4 min | 10.3% | 58 |
| BWI BDL Baltimore/Washington International Thurgood Marshall Airport – Bradley International Airport | 455 | 23.6 min | 55.2% | 58 |
| PHX MKE Phoenix Sky Harbor International Airport – General Mitchell International Airport | 2,346 | 7.3 min | 82.9% | 41 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 21 | 21 | 90.5% | 0 |
| November 2024 | 4 | 4 | 75.0% | 0 |
| December 2024 | 8 | 8 | 37.5% | 0 |
| January 2025 | 24 | 24 | 70.8% | 0 |
| February 2025 | 18 | 18 | 66.7% | 0 |
| March 2025 | 4 | 4 | 50.0% | 0 |
| April 2025 | 23 | 23 | 47.8% | 0 |
| May 2025 | 31 | 31 | 54.8% | 0 |
| June 2025 | 4 | 4 | 100.0% | 0 |
| August 2025 | 12 | 12 | 75.0% | 0 |
| September 2025 | 13 | 13 | 100.0% | 0 |
| October 2025 | 14 | 14 | 100.0% | 0 |
| November 2025 | 3 | 3 | 100.0% | 0 |
| December 2025 | 2 | 2 | 100.0% | 0 |
| January 2026 | 1 | 1 | 100.0% | 0 |
| February 2026 | 6 | 6 | 83.3% | 0 |
| March 2026 | 24 | 24 | 95.8% | 0 |
| April 2026 | 29 | 29 | 24.1% | 0 |
| May 2026 | 31 | 31 | 12.9% | 0 |
| June 2026 | 23 | 23 | 73.9% | 0 |
| July 2026 | 21 | 21 | 81.0% | 0 |