WN4379
WN4379 (Southwest Airlines) is a multi-stop service on 16 routes, busiest Oakland to San Diego. Of 446 departures recorded from October 2024 to July 2026, 76.6% left on time, according to the US BTS.
- On-time departures76.6%of 446 flights
- Average delay14.1 min
- July 202617▲ 112.5%vs July 2025
- Cancelled0.5%
- Legs flown under this number16
Recorded departures by month
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 | 33 | 5 | ▼ 84.8% |
| February | 22 | 7 | ▼ 68.2% |
| March | 30 | 28 | ▼ 6.7% |
| April | 30 | 9 | ▼ 70.0% |
| May | 31 | 5 | ▼ 83.9% |
| June | 12 | 16 | ▲ 33.3% |
| July | 8 | 17 | ▲ 112.5% |
| August | 29 | – | – |
| September | 30 | – | – |
| October | 1 | – | in progress |
| November | 28 | – | – |
| December | 31 | – | – |
| Year to date (Jan–Jul) | 166 | 87 | ▼ 47.6% |
according to the US BTS · October 2024 → July 2026
On-time departures by month
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 | 87.9% | 60.0% | ▼ 31.7% |
| February | 95.5% | 100.0% | ▲ 4.8% |
| March | 80.0% | 89.3% | ▲ 11.6% |
| April | 66.7% | 88.9% | ▲ 33.3% |
| May | 61.3% | 80.0% | ▲ 30.5% |
| June | 66.7% | 25.0% | ▼ 62.5% |
| July | 75.0% | 41.2% | ▼ 45.1% |
| August | 89.7% | – | – |
| September | 96.7% | – | – |
| October | 100.0% | – | in progress |
| November | 57.1% | – | – |
| December | 64.5% | – | – |
| Year-to-date average (Jan–Jul) | 76.1% | 69.2% | ▼ 9.1% |
according to the US BTS · October 2024 → July 2026
Average departure delay by month
according to the US BTS · October 2024 → July 2026
Cancelled departures by month
The most recent periods19 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 0 | – |
| February | 0 | 1 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 0 | 1 |
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 99.6% 444
- Cancelled 0.4% 2
Share of all recorded flights in the period, all legs. · Oct 31, 2024 → Jul 31, 2026
On time, leg by leg
Departures within 15 minutes of schedule; small figure = departures recorded.
Legs flown under this number
7| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| OAK SAN Oakland San Francisco Bay Airport – San Diego International Airport | 718 | -1.4 min | 95.9% | 74 |
| STL SMF St. Louis Lambert International Airport – Sacramento International Airport | 2,695 | 19.5 min | 60.9% | 64 |
| SRQ MDW Sarasota Bradenton International Airport – Chicago Midway International Airport | 1,669 | 4.7 min | 93.1% | 58 |
| LGA STL LaGuardia Airport – St. Louis Lambert International Airport | 1,426 | 22.2 min | 62.1% | 58 |
| SAT SAN San Antonio International Airport – San Diego International Airport | 1,814 | -0.3 min | 90.9% | 33 |
| MCO BUF Orlando International Airport – Buffalo Niagara International Airport | 1,630 | 17.0 min | 75.8% | 33 |
| DEN ECP Denver International Airport – Northwest Florida Beaches International Airport | 2,010 | 63.4 min | 33.3% | 33 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 1 | 1 | 100.0% | 0 |
| November 2024 | 40 | 40 | 82.5% | 0 |
| December 2024 | 33 | 32 | 93.8% | 1 |
| January 2025 | 33 | 33 | 87.9% | 0 |
| February 2025 | 22 | 22 | 95.5% | 0 |
| March 2025 | 30 | 30 | 80.0% | 0 |
| April 2025 | 30 | 30 | 66.7% | 0 |
| May 2025 | 31 | 31 | 61.3% | 0 |
| June 2025 | 12 | 12 | 66.7% | 0 |
| July 2025 | 8 | 8 | 75.0% | 0 |
| August 2025 | 29 | 29 | 89.7% | 0 |
| September 2025 | 30 | 30 | 96.7% | 0 |
| October 2025 | 1 | 1 | 100.0% | 0 |
| November 2025 | 28 | 28 | 57.1% | 0 |
| December 2025 | 31 | 31 | 64.5% | 0 |
| January 2026 | 5 | 5 | 60.0% | 0 |
| February 2026 | 7 | 6 | 100.0% | 1 |
| March 2026 | 28 | 28 | 89.3% | 0 |
| April 2026 | 9 | 9 | 88.9% | 0 |
| May 2026 | 5 | 5 | 80.0% | 0 |
| June 2026 | 16 | 16 | 25.0% | 0 |
| July 2026 | 17 | 17 | 41.2% | 0 |