WN4233
WN4233 (Southwest Airlines) is a multi-stop service on 35 routes, busiest Dallas to Ontario. Of 345 departures recorded from October 2024 to July 2026, 75.4% left on time, according to the US BTS.
- On-time departures75.4%of 345 flights
- Average delay12.2 min
- July 202623
- Cancelled0.9%
- Legs flown under this number35
Recorded departures by month
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods18 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 30 | 8 | ▼ 73.3% |
| February | 28 | 10 | ▼ 64.3% |
| March | 12 | 28 | ▲ 133.3% |
| April | 5 | 20 | ▲ 300.0% |
| May | 3 | 17 | ▲ 466.7% |
| June | 1 | 21 | ▲ 2,000.0% |
| July | – | 23 | – |
| August | 27 | – | – |
| September | 30 | – | – |
| October | 1 | – | in progress |
| November | 6 | – | – |
| December | 15 | – | – |
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 periods18 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 70.0% | 100.0% | ▲ 42.9% |
| February | 78.6% | 100.0% | ▲ 27.3% |
| March | 58.3% | 78.6% | ▲ 34.7% |
| April | 80.0% | 90.0% | ▲ 12.5% |
| May | 33.3% | 88.2% | ▲ 164.7% |
| June | 100.0% | 31.6% | ▼ 68.4% |
| July | – | 40.9% | – |
| August | 88.9% | – | – |
| September | 83.3% | – | – |
| October | 100.0% | – | in progress |
| November | 83.3% | – | – |
| December | 80.0% | – | – |
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 periods18 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 0 | – |
| February | 0 | 0 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 2 | – |
| July | – | 1 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | 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 99.1% 342
- Cancelled 0.9% 3
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
3| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| DAL ONT Dallas Love Field – Ontario International Airport | 1,927 | 18.7 min | 74.2% | 97 |
| SAT DEN San Antonio International Airport – Denver International Airport | 1,280 | 3.5 min | 86.2% | 58 |
| PHX MDW Phoenix Sky Harbor International Airport – Chicago Midway International Airport | 2,319 | 4.7 min | 83.3% | 30 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 13 | 13 | 76.9% | 0 |
| November 2024 | 17 | 17 | 88.2% | 0 |
| December 2024 | 30 | 30 | 73.3% | 0 |
| January 2025 | 30 | 30 | 70.0% | 0 |
| February 2025 | 28 | 28 | 78.6% | 0 |
| March 2025 | 12 | 12 | 58.3% | 0 |
| April 2025 | 5 | 5 | 80.0% | 0 |
| May 2025 | 3 | 3 | 33.3% | 0 |
| June 2025 | 1 | 1 | 100.0% | 0 |
| August 2025 | 27 | 27 | 88.9% | 0 |
| September 2025 | 30 | 30 | 83.3% | 0 |
| October 2025 | 1 | 1 | 100.0% | 0 |
| November 2025 | 6 | 6 | 83.3% | 0 |
| December 2025 | 15 | 15 | 80.0% | 0 |
| January 2026 | 8 | 8 | 100.0% | 0 |
| February 2026 | 10 | 10 | 100.0% | 0 |
| March 2026 | 28 | 28 | 78.6% | 0 |
| April 2026 | 20 | 20 | 90.0% | 0 |
| May 2026 | 17 | 17 | 88.2% | 0 |
| June 2026 | 21 | 19 | 31.6% | 2 |
| July 2026 | 23 | 22 | 40.9% | 1 |