WN4240
WN4240 (Southwest Airlines) is a multi-stop service on 24 routes, busiest San Jose to San Diego. Of 414 departures recorded from October 2024 to July 2026, 67.8% left on time, according to the US BTS.
- On-time departures67.8%of 414 flights
- Average delay16.9 min
- July 202635▼ 39.7%vs July 2025
- Cancelled1.0%
- Legs flown under this number24
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 | 2 | 28 | ▲ 1,300.0% |
| February | 2 | 28 | ▲ 1,300.0% |
| March | 31 | 16 | ▼ 48.4% |
| April | 11 | 3 | ▼ 72.7% |
| May | 6 | – | – |
| June | 54 | 30 | ▼ 44.4% |
| July | 58 | 35 | ▼ 39.7% |
| August | 27 | – | – |
| September | 21 | – | – |
| October | – | – | in progress |
| November | 2 | – | – |
| December | 9 | – | – |
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 | 100.0% | 78.6% | ▼ 21.4% |
| February | 50.0% | 75.0% | ▲ 50.0% |
| March | 61.3% | 87.5% | ▲ 42.8% |
| April | 50.0% | 66.7% | ▲ 33.3% |
| May | 80.0% | – | – |
| June | 64.2% | 50.0% | ▼ 22.1% |
| July | 63.2% | 37.1% | ▼ 41.2% |
| August | 88.9% | – | – |
| September | 90.5% | – | – |
| October | – | – | in progress |
| November | 50.0% | – | – |
| December | 77.8% | – | – |
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 | 0 | 0 | – |
| March | 0 | 0 | – |
| April | 1 | 0 | ▼ 100.0% |
| May | 1 | – | – |
| June | 1 | 0 | ▼ 100.0% |
| July | 1 | 0 | ▼ 100.0% |
| August | 0 | – | – |
| September | 0 | – | – |
| October | – | – | 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 99.0% 410
- Cancelled 1.0% 4
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
5| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| SJC SAN Mineta San Jose International Airport – San Diego International Airport | 671 | 6.2 min | 82.4% | 75 |
| DEN HDN Denver International Airport – Yampa Valley Airport | 227 | 11.7 min | 77.6% | 58 |
| MCI LAS Kansas City International Airport – Harry Reid International Airport | 1,829 | 34.9 min | 28.6% | 42 |
| SAT STL San Antonio International Airport – St. Louis Lambert International Airport | 1,266 | -1.4 min | 94.9% | 39 |
| ATL IND Hartsfield Jackson Atlanta International Airport – Indianapolis International Airport | 696 | 33.2 min | 60.6% | 33 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 35 | 35 | 74.3% | 0 |
| November 2024 | 8 | 8 | 87.5% | 0 |
| December 2024 | 8 | 8 | 75.0% | 0 |
| January 2025 | 2 | 2 | 100.0% | 0 |
| February 2025 | 2 | 2 | 50.0% | 0 |
| March 2025 | 31 | 31 | 61.3% | 0 |
| April 2025 | 11 | 10 | 50.0% | 1 |
| May 2025 | 6 | 5 | 80.0% | 1 |
| June 2025 | 54 | 53 | 64.2% | 1 |
| July 2025 | 58 | 57 | 63.2% | 1 |
| August 2025 | 27 | 27 | 88.9% | 0 |
| September 2025 | 21 | 21 | 90.5% | 0 |
| November 2025 | 2 | 2 | 50.0% | 0 |
| December 2025 | 9 | 9 | 77.8% | 0 |
| January 2026 | 28 | 28 | 78.6% | 0 |
| February 2026 | 28 | 28 | 75.0% | 0 |
| March 2026 | 16 | 16 | 87.5% | 0 |
| April 2026 | 3 | 3 | 66.7% | 0 |
| June 2026 | 30 | 30 | 50.0% | 0 |
| July 2026 | 35 | 35 | 37.1% | 0 |