WN4310
WN4310 (Southwest Airlines) is a multi-stop service on 10 routes, busiest San Jose to Seattle. Of 356 departures recorded from October 2024 to July 2026, 77.4% left on time, according to the US BTS.
- On-time departures77.4%of 356 flights
- Average delay12.3 min
- July 202621
- Cancelled0.6%
- Legs flown under this number10
Recorded departures by month
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods15 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 28 | 4 | ▼ 85.7% |
| February | 16 | – | – |
| March | 22 | 4 | ▼ 81.8% |
| April | 28 | 11 | ▼ 60.7% |
| May | 31 | 13 | ▼ 58.1% |
| June | 4 | 21 | ▲ 425.0% |
| July | – | 21 | – |
| August | – | – | – |
| September | – | – | – |
| October | 21 | – | in progress |
| November | 27 | – | – |
| December | 29 | – | – |
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 periods15 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 92.9% | 0.0% | ▼ 100.0% |
| February | 93.8% | – | – |
| March | 86.4% | 75.0% | ▼ 13.2% |
| April | 92.9% | 81.8% | ▼ 11.9% |
| May | 74.2% | 84.6% | ▲ 14.1% |
| June | 75.0% | 100.0% | ▲ 33.3% |
| July | – | 95.2% | – |
| August | – | – | – |
| September | – | – | – |
| October | 52.4% | – | in progress |
| November | 36.0% | – | – |
| December | 44.8% | – | – |
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 periods15 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 0 | – |
| February | 0 | – | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | – | 0 | – |
| August | – | – | – |
| September | – | – | – |
| October | 0 | – | in progress |
| November | 2 | – | – |
| 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 99.4% 354
- Cancelled 0.6% 2
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
4| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| SJC SEA Mineta San Jose International Airport – Seattle–Tacoma International Airport | 1,122 | 1.4 min | 90.1% | 101 |
| SFO SAN San Francisco International Airport – San Diego International Airport | 719 | 42.6 min | 36.8% | 59 |
| HOU CMH William P. Hobby Airport – John Glenn Columbus International Airport | 1,610 | 9.6 min | 81.0% | 58 |
| MCO SAT Orlando International Airport – San Antonio International Airport | 1,672 | -2.4 min | 97.6% | 41 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 80.0% | 0 |
| November 2024 | 28 | 28 | 96.4% | 0 |
| December 2024 | 28 | 28 | 78.6% | 0 |
| January 2025 | 28 | 28 | 92.9% | 0 |
| February 2025 | 16 | 16 | 93.8% | 0 |
| March 2025 | 22 | 22 | 86.4% | 0 |
| April 2025 | 28 | 28 | 92.9% | 0 |
| May 2025 | 31 | 31 | 74.2% | 0 |
| June 2025 | 4 | 4 | 75.0% | 0 |
| October 2025 | 21 | 21 | 52.4% | 0 |
| November 2025 | 27 | 25 | 36.0% | 2 |
| December 2025 | 29 | 29 | 44.8% | 0 |
| January 2026 | 4 | 4 | 0.0% | 0 |
| March 2026 | 4 | 4 | 75.0% | 0 |
| April 2026 | 11 | 11 | 81.8% | 0 |
| May 2026 | 13 | 13 | 84.6% | 0 |
| June 2026 | 21 | 21 | 100.0% | 0 |
| July 2026 | 21 | 21 | 95.2% | 0 |