WN4635
WN4635 (Southwest Airlines) is a multi-stop service on 17 routes, busiest Austin to Harlingen. Of 346 departures recorded from October 2024 to July 2026, 73.6% left on time, according to the US BTS.
- On-time departures73.6%of 346 flights
- Average delay15.5 min
- July 202631
- Cancelled1.5%
- Legs flown under this number17
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 | 36 | 5 | ▼ 86.1% |
| February | 25 | 10 | ▼ 60.0% |
| March | 4 | 3 | ▼ 25.0% |
| April | 29 | 4 | ▼ 86.2% |
| May | 37 | 4 | ▼ 89.2% |
| June | 6 | 27 | ▲ 350.0% |
| July | – | 31 | – |
| August | – | – | – |
| September | – | – | – |
| October | – | – | in progress |
| November | 25 | – | – |
| 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 | 82.4% | 100.0% | ▲ 21.4% |
| February | 88.0% | 30.0% | ▼ 65.9% |
| March | 100.0% | 66.7% | ▼ 33.3% |
| April | 86.2% | 50.0% | ▼ 42.0% |
| May | 67.6% | 33.3% | ▼ 50.7% |
| June | 66.7% | 48.2% | ▼ 27.8% |
| July | – | 41.9% | – |
| August | – | – | – |
| September | – | – | – |
| October | – | – | in progress |
| November | 80.0% | – | – |
| December | 96.4% | – | – |
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 | 2 | 0 | ▼ 100.0% |
| February | 0 | 0 | – |
| March | 1 | 0 | ▼ 100.0% |
| April | 0 | 0 | – |
| May | 0 | 1 | – |
| June | 0 | 0 | – |
| July | – | 0 | – |
| August | – | – | – |
| September | – | – | – |
| October | – | – | in progress |
| November | 0 | – | – |
| December | 1 | – | – |
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 98.6% 341
- Cancelled 1.4% 5
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 |
|---|---|---|---|---|
| AUS HRL Austin Bergstrom International Airport – Valley International Airport | 441 | 3.5 min | 86.9% | 87 |
| HOU LGA William P. Hobby Airport – LaGuardia Airport | 2,295 | 7.4 min | 89.7% | 59 |
| DEN TUL Denver International Airport – Tulsa International Airport | 870 | 33.0 min | 44.8% | 58 |
| MCI MDW Kansas City International Airport – Chicago Midway International Airport | 650 | 19.3 min | 75.4% | 57 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 19 | 19 | 84.2% | 0 |
| November 2024 | 16 | 16 | 87.5% | 0 |
| December 2024 | 36 | 36 | 77.8% | 0 |
| January 2025 | 36 | 34 | 82.4% | 2 |
| February 2025 | 25 | 25 | 88.0% | 0 |
| March 2025 | 4 | 3 | 100.0% | 1 |
| April 2025 | 29 | 29 | 86.2% | 0 |
| May 2025 | 37 | 37 | 67.6% | 0 |
| June 2025 | 6 | 6 | 66.7% | 0 |
| November 2025 | 25 | 25 | 80.0% | 0 |
| December 2025 | 29 | 28 | 96.4% | 1 |
| January 2026 | 5 | 5 | 100.0% | 0 |
| February 2026 | 10 | 10 | 30.0% | 0 |
| March 2026 | 3 | 3 | 66.7% | 0 |
| April 2026 | 4 | 4 | 50.0% | 0 |
| May 2026 | 4 | 3 | 33.3% | 1 |
| June 2026 | 27 | 27 | 48.2% | 0 |
| July 2026 | 31 | 31 | 41.9% | 0 |