WN4355
WN4355 (Southwest Airlines) is a multi-stop service on 35 routes, busiest San Diego to San Jose. Of 732 departures recorded from October 2024 to July 2026, 73.3% left on time, according to the US BTS.
- On-time departures73.3%of 732 flights
- Average delay16.6 min
- July 2026100▲ 1,150.0%vs July 2025
- Cancelled1.8%
- Legs flown under this number35
Recorded departures by month
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods17 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 60 | 53 | ▼ 11.7% |
| February | 43 | 63 | ▲ 46.5% |
| March | 8 | 36 | ▲ 350.0% |
| April | – | 9 | – |
| May | 1 | 6 | ▲ 500.0% |
| June | 8 | 89 | ▲ 1,012.5% |
| July | 8 | 100 | ▲ 1,150.0% |
| August | 13 | – | – |
| September | 13 | – | – |
| October | – | – | in progress |
| November | 43 | – | – |
| December | 50 | – | – |
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 periods17 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 80.0% | 84.9% | ▲ 6.1% |
| February | 88.1% | 79.4% | ▼ 9.9% |
| March | 75.0% | 86.1% | ▲ 14.8% |
| April | – | 77.8% | – |
| May | 100.0% | 33.3% | ▼ 66.7% |
| June | 87.5% | 63.2% | ▼ 27.7% |
| July | 62.5% | 55.3% | ▼ 11.5% |
| August | 100.0% | – | – |
| September | 84.6% | – | – |
| October | – | – | in progress |
| November | 90.5% | – | – |
| December | 84.0% | – | – |
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 periods17 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 0 | – |
| February | 1 | 0 | ▼ 100.0% |
| March | 0 | 0 | – |
| April | – | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 2 | – |
| July | 0 | 6 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | – | – | in progress |
| November | 1 | – | – |
| 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 98.2% 719
- Cancelled 1.8% 13
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
8| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| SAN SJC San Diego International Airport – Mineta San Jose International Airport | 671 | 10.1 min | 79.0% | 84 |
| PHX SAN Phoenix Sky Harbor International Airport – San Diego International Airport | 489 | 19.2 min | 63.0% | 55 |
| ELP PHX El Paso International Airport – Phoenix Sky Harbor International Airport | 557 | 16.5 min | 71.7% | 46 |
| HOU FLL William P. Hobby Airport – Fort Lauderdale Hollywood International Airport | 1,538 | 11.5 min | 83.3% | 42 |
| FLL BWI Fort Lauderdale Hollywood International Airport – Baltimore/Washington International Thurgood Marshall Airport | 1,493 | 38.1 min | 51.2% | 42 |
| BWI ALB Baltimore/Washington International Thurgood Marshall Airport – Albany International Airport | 464 | 36.0 min | 47.4% | 41 |
| ALB MDW Albany International Airport – Chicago Midway International Airport | 1,152 | 30.3 min | 48.4% | 34 |
| SAN DEN San Diego International Airport – Denver International Airport | 1,371 | 11.4 min | 84.9% | 33 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 26 | 26 | 84.6% | 0 |
| November 2024 | 65 | 65 | 52.3% | 0 |
| December 2024 | 38 | 35 | 60.0% | 3 |
| January 2025 | 60 | 60 | 80.0% | 0 |
| February 2025 | 43 | 42 | 88.1% | 1 |
| March 2025 | 8 | 8 | 75.0% | 0 |
| May 2025 | 1 | 1 | 100.0% | 0 |
| June 2025 | 8 | 8 | 87.5% | 0 |
| July 2025 | 8 | 8 | 62.5% | 0 |
| August 2025 | 13 | 13 | 100.0% | 0 |
| September 2025 | 13 | 13 | 84.6% | 0 |
| November 2025 | 43 | 42 | 90.5% | 1 |
| December 2025 | 50 | 50 | 84.0% | 0 |
| January 2026 | 53 | 53 | 84.9% | 0 |
| February 2026 | 63 | 63 | 79.4% | 0 |
| March 2026 | 36 | 36 | 86.1% | 0 |
| April 2026 | 9 | 9 | 77.8% | 0 |
| May 2026 | 6 | 6 | 33.3% | 0 |
| June 2026 | 89 | 87 | 63.2% | 2 |
| July 2026 | 100 | 94 | 55.3% | 6 |