WN4278
WN4278 (Southwest Airlines) is a multi-stop service on 19 routes, busiest San Jose to Burbank. Of 401 departures recorded from October 2024 to July 2026, 77.8% left on time, according to the US BTS.
- On-time departures77.8%of 401 flights
- Average delay10.1 min
- July 202614▼ 30.0%vs July 2025
- Cancelled1.3%
- Legs flown under this number19
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 | 40 | 27 | ▼ 32.5% |
| February | 35 | 37 | ▲ 5.7% |
| March | 7 | 13 | ▲ 85.7% |
| April | 15 | 22 | ▲ 46.7% |
| May | 23 | 26 | ▲ 13.0% |
| June | 22 | 15 | ▼ 31.8% |
| July | 20 | 14 | ▼ 30.0% |
| August | 31 | – | – |
| September | 30 | – | – |
| October | 1 | – | in progress |
| November | 3 | – | – |
| December | 2 | – | – |
| Year to date (Jan–Jul) | 162 | 154 | ▼ 4.9% |
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 | 84.6% | 83.3% | ▼ 1.5% |
| February | 77.1% | 64.9% | ▼ 15.9% |
| March | 83.3% | 76.9% | ▼ 7.7% |
| April | 73.3% | 77.3% | ▲ 5.4% |
| May | 52.2% | 88.5% | ▲ 69.6% |
| June | 95.5% | 46.7% | ▼ 51.1% |
| July | 90.0% | 78.6% | ▼ 12.7% |
| August | 87.1% | – | – |
| September | 80.0% | – | – |
| October | 100.0% | – | in progress |
| November | 100.0% | – | – |
| December | 0.0% | – | – |
| Year-to-date average (Jan–Jul) | 79.4% | 73.7% | ▼ 7.2% |
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 | 1 | 3 | ▲ 200.0% |
| February | 0 | 0 | – |
| March | 1 | 0 | ▼ 100.0% |
| 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) | 2 | 3 | ▲ 50.0% |
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 98.8% 396
- Cancelled 1.2% 5
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
6| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| SJC BUR Mineta San Jose International Airport – Hollywood Burbank/Bob Hope Airport | 477 | 6.0 min | 82.8% | 58 |
| MCO DAL Orlando International Airport – Dallas Love Field | 1,564 | 22.2 min | 74.6% | 57 |
| SJC SNA Mineta San Jose International Airport – John Wayne Orange County International Airport | 550 | 3.8 min | 84.0% | 50 |
| SAN OAK San Diego International Airport – Oakland San Francisco Bay Airport | 718 | 8.4 min | 82.0% | 50 |
| CHS BNA Charleston International Airport – Nashville International Airport | 706 | 13.1 min | 62.5% | 40 |
| SMF AUS Sacramento International Airport – Austin Bergstrom International Airport | 2,380 | 1.9 min | 91.4% | 35 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 12 | 12 | 83.3% | 0 |
| November 2024 | 4 | 4 | 75.0% | 0 |
| December 2024 | 2 | 2 | 50.0% | 0 |
| January 2025 | 40 | 39 | 84.6% | 1 |
| February 2025 | 35 | 35 | 77.1% | 0 |
| March 2025 | 7 | 6 | 83.3% | 1 |
| April 2025 | 15 | 15 | 73.3% | 0 |
| May 2025 | 23 | 23 | 52.2% | 0 |
| June 2025 | 22 | 22 | 95.5% | 0 |
| July 2025 | 20 | 20 | 90.0% | 0 |
| August 2025 | 31 | 31 | 87.1% | 0 |
| September 2025 | 30 | 30 | 80.0% | 0 |
| October 2025 | 1 | 1 | 100.0% | 0 |
| November 2025 | 3 | 3 | 100.0% | 0 |
| December 2025 | 2 | 2 | 0.0% | 0 |
| January 2026 | 27 | 24 | 83.3% | 3 |
| February 2026 | 37 | 37 | 64.9% | 0 |
| March 2026 | 13 | 13 | 76.9% | 0 |
| April 2026 | 22 | 22 | 77.3% | 0 |
| May 2026 | 26 | 26 | 88.5% | 0 |
| June 2026 | 15 | 15 | 46.7% | 0 |
| July 2026 | 14 | 14 | 78.6% | 0 |