WN3956
WN3956 (Southwest Airlines) is a multi-stop service on 19 routes, busiest Chicago to Houston. Of 419 departures recorded from October 2024 to July 2026, 77.1% left on time, according to the US BTS.
- On-time departures77.1%of 419 flights
- Average delay11.6 min
- July 202616▼ 57.9%vs July 2025
- Cancelled1.2%
- Legs flown under this number19
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 | 28 | 5 | ▼ 82.1% |
| February | 24 | 17 | ▼ 29.2% |
| March | 36 | 6 | ▼ 83.3% |
| April | 9 | 1 | ▼ 88.9% |
| May | – | – | – |
| June | 28 | 15 | ▼ 46.4% |
| July | 38 | 16 | ▼ 57.9% |
| August | 26 | – | – |
| September | 26 | – | – |
| October | 23 | – | 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 periods17 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 81.5% | 100.0% | ▲ 22.7% |
| February | 87.0% | 52.9% | ▼ 39.1% |
| March | 88.9% | 50.0% | ▼ 43.8% |
| April | 75.0% | 100.0% | ▲ 33.3% |
| May | – | – | – |
| June | 60.7% | 57.1% | ▼ 5.9% |
| July | 76.3% | 43.8% | ▼ 42.7% |
| August | 84.6% | – | – |
| September | 84.6% | – | – |
| October | 78.3% | – | in progress |
| November | 88.5% | – | – |
| December | 82.8% | – | – |
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 | 1 | 0 | ▼ 100.0% |
| February | 1 | 0 | ▼ 100.0% |
| March | 0 | 0 | – |
| April | 1 | 0 | ▼ 100.0% |
| May | – | – | – |
| June | 0 | 1 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | 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 98.8% 414
- Cancelled 1.2% 5
Share of all recorded flights in the period, all legs. · Oct 13, 2024 → Jul 29, 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 |
|---|---|---|---|---|
| MDW HOU Chicago Midway International Airport – William P. Hobby Airport | 1,510 | 9.5 min | 80.7% | 111 |
| OKC PHX OKC Will Rogers World Airport – Phoenix Sky Harbor International Airport | 1,338 | 2.6 min | 86.4% | 60 |
| MEM PHX Frederick W. Smith International Airport – Phoenix Sky Harbor International Airport | 2,029 | 20.5 min | 61.5% | 52 |
| SMF ONT Sacramento International Airport – Ontario International Airport | 627 | 6.4 min | 86.0% | 50 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 10 | 10 | 90.0% | 0 |
| November 2024 | 26 | 26 | 76.9% | 0 |
| December 2024 | 29 | 29 | 75.9% | 0 |
| January 2025 | 28 | 27 | 81.5% | 1 |
| February 2025 | 24 | 23 | 87.0% | 1 |
| March 2025 | 36 | 36 | 88.9% | 0 |
| April 2025 | 9 | 8 | 75.0% | 1 |
| June 2025 | 28 | 28 | 60.7% | 0 |
| July 2025 | 38 | 38 | 76.3% | 0 |
| August 2025 | 26 | 26 | 84.6% | 0 |
| September 2025 | 26 | 26 | 84.6% | 0 |
| October 2025 | 23 | 23 | 78.3% | 0 |
| November 2025 | 27 | 26 | 88.5% | 1 |
| December 2025 | 29 | 29 | 82.8% | 0 |
| January 2026 | 5 | 5 | 100.0% | 0 |
| February 2026 | 17 | 17 | 52.9% | 0 |
| March 2026 | 6 | 6 | 50.0% | 0 |
| April 2026 | 1 | 1 | 100.0% | 0 |
| June 2026 | 15 | 14 | 57.1% | 1 |
| July 2026 | 16 | 16 | 43.8% | 0 |