WN4403
WN4403 (Southwest Airlines) is a multi-stop service on 21 routes, busiest San Diego to Baltimore. Of 454 departures recorded from October 2024 to July 2026, 73.8% left on time, according to the US BTS.
- On-time departures73.8%of 454 flights
- Average delay14.5 min
- July 202668▲ 423.1%vs July 2025
- Cancelled0.9%
- Legs flown under this number21
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 | 33 | 7 | ▼ 78.8% |
| February | 23 | – | – |
| March | 4 | – | – |
| April | 3 | 24 | ▲ 700.0% |
| May | 3 | 32 | ▲ 966.7% |
| June | 13 | 61 | ▲ 369.2% |
| July | 13 | 68 | ▲ 423.1% |
| August | 2 | – | – |
| September | – | – | – |
| October | 33 | – | in progress |
| November | 32 | – | – |
| 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 | 77.4% | 71.4% | ▼ 7.7% |
| February | 86.4% | – | – |
| March | 75.0% | – | – |
| April | 66.7% | 87.5% | ▲ 31.2% |
| May | 100.0% | 90.6% | ▼ 9.4% |
| June | 50.0% | 70.5% | ▲ 41.0% |
| July | 53.9% | 86.8% | ▲ 61.1% |
| August | 50.0% | – | – |
| September | – | – | – |
| October | 42.4% | – | in progress |
| November | 81.3% | – | – |
| December | 72.5% | – | – |
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 | 2 | 0 | ▼ 100.0% |
| February | 1 | – | – |
| March | 0 | – | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 1 | 0 | ▼ 100.0% |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | – | – | – |
| 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 99.1% 450
- Cancelled 0.9% 4
Share of all recorded flights in the period, all legs. · Oct 15, 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 |
|---|---|---|---|---|
| SAN BWI San Diego International Airport – Baltimore/Washington International Thurgood Marshall Airport | 3,686 | 6.1 min | 77.4% | 65 |
| SNA OAK John Wayne Orange County International Airport – Oakland San Francisco Bay Airport | 597 | 7.5 min | 86.4% | 59 |
| BWI DAL Baltimore/Washington International Thurgood Marshall Airport – Dallas Love Field | 1,942 | 10.5 min | 86.2% | 58 |
| SNA SJC John Wayne Orange County International Airport – Mineta San Jose International Airport | 550 | 0.7 min | 90.0% | 50 |
| SAN SMF San Diego International Airport – Sacramento International Airport | 773 | 45.8 min | 29.4% | 34 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 7 | 7 | 71.4% | 0 |
| November 2024 | 18 | 18 | 83.3% | 0 |
| December 2024 | 38 | 38 | 55.3% | 0 |
| January 2025 | 33 | 31 | 77.4% | 2 |
| February 2025 | 23 | 22 | 86.4% | 1 |
| March 2025 | 4 | 4 | 75.0% | 0 |
| April 2025 | 3 | 3 | 66.7% | 0 |
| May 2025 | 3 | 3 | 100.0% | 0 |
| June 2025 | 13 | 12 | 50.0% | 1 |
| July 2025 | 13 | 13 | 53.9% | 0 |
| August 2025 | 2 | 2 | 50.0% | 0 |
| October 2025 | 33 | 33 | 42.4% | 0 |
| November 2025 | 32 | 32 | 81.3% | 0 |
| December 2025 | 40 | 40 | 72.5% | 0 |
| January 2026 | 7 | 7 | 71.4% | 0 |
| April 2026 | 24 | 24 | 87.5% | 0 |
| May 2026 | 32 | 32 | 90.6% | 0 |
| June 2026 | 61 | 61 | 70.5% | 0 |
| July 2026 | 68 | 68 | 86.8% | 0 |