WN519
WN519 (Southwest Airlines) is a multi-stop service on 41 routes, busiest Chicago to Houston. Of 783 departures recorded from October 2024 to July 2026, 78.0% left on time, according to the US BTS.
- On-time departures78.0%of 783 flights
- Average delay10.4 min
- July 202671▲ 73.2%vs July 2025
- Cancelled1.5%
- Legs flown under this number41
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 | 50 | 13 | ▼ 74.0% |
| February | 42 | 18 | ▼ 57.1% |
| March | 30 | 29 | ▼ 3.3% |
| April | 29 | 19 | ▼ 34.5% |
| May | 31 | 18 | ▼ 41.9% |
| June | 36 | 61 | ▲ 69.4% |
| July | 41 | 71 | ▲ 73.2% |
| August | 38 | – | – |
| September | 38 | – | – |
| October | 51 | – | in progress |
| November | 47 | – | – |
| December | 37 | – | – |
| Year to date (Jan–Jul) | 259 | 229 | ▼ 11.6% |
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 | 83.7% | 76.9% | ▼ 8.1% |
| February | 76.2% | 55.6% | ▼ 27.1% |
| March | 72.4% | 64.3% | ▼ 11.2% |
| April | 89.7% | 57.9% | ▼ 35.4% |
| May | 77.4% | 50.0% | ▼ 35.4% |
| June | 80.0% | 80.3% | ▲ 0.4% |
| July | 72.5% | 84.5% | ▲ 16.6% |
| August | 57.9% | – | – |
| September | 63.2% | – | – |
| October | 92.2% | – | in progress |
| November | 90.2% | – | – |
| December | 66.7% | – | – |
| Year-to-date average (Jan–Jul) | 78.8% | 67.1% | ▼ 14.9% |
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 | 0 | ▼ 100.0% |
| February | 0 | 0 | – |
| March | 1 | 1 | 0.0% |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 1 | 0 | ▼ 100.0% |
| July | 1 | 0 | ▼ 100.0% |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 6 | – | – |
| December | 1 | – | – |
| Year to date (Jan–Jul) | 4 | 1 | ▼ 75.0% |
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 98.5% 771
- Cancelled 1.5% 12
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
10Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 27 | 27 | 92.6% | 0 |
| November 2024 | 28 | 28 | 96.4% | 0 |
| December 2024 | 29 | 29 | 93.1% | 0 |
| January 2025 | 50 | 49 | 83.7% | 1 |
| February 2025 | 42 | 42 | 76.2% | 0 |
| March 2025 | 30 | 29 | 72.4% | 1 |
| April 2025 | 29 | 29 | 89.7% | 0 |
| May 2025 | 31 | 31 | 77.4% | 0 |
| June 2025 | 36 | 35 | 80.0% | 1 |
| July 2025 | 41 | 40 | 72.5% | 1 |
| August 2025 | 38 | 38 | 57.9% | 0 |
| September 2025 | 38 | 38 | 63.2% | 0 |
| October 2025 | 51 | 51 | 92.2% | 0 |
| November 2025 | 47 | 41 | 90.2% | 6 |
| December 2025 | 37 | 36 | 66.7% | 1 |
| January 2026 | 13 | 13 | 76.9% | 0 |
| February 2026 | 18 | 18 | 55.6% | 0 |
| March 2026 | 29 | 28 | 64.3% | 1 |
| April 2026 | 19 | 19 | 57.9% | 0 |
| May 2026 | 18 | 18 | 50.0% | 0 |
| June 2026 | 61 | 61 | 80.3% | 0 |
| July 2026 | 71 | 71 | 84.5% | 0 |