WN3859
WN3859 (Southwest Airlines) is a multi-stop service on 21 routes, busiest Houston to Harlingen. Of 339 departures recorded from October 2024 to July 2026, 84.0% left on time, according to the US BTS.
- On-time departures84.0%of 339 flights
- Average delay9.1 min
- July 202630▲ 20.0%vs July 2025
- Cancelled0.3%
- Legs flown under this number21
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 | 19 | 6 | ▼ 68.4% |
| February | 17 | – | – |
| March | 11 | 8 | ▼ 27.3% |
| April | 5 | 26 | ▲ 420.0% |
| May | 3 | 31 | ▲ 933.3% |
| June | 25 | 30 | ▲ 20.0% |
| July | 25 | 30 | ▲ 20.0% |
| August | 5 | – | – |
| September | – | – | – |
| October | 29 | – | in progress |
| November | 27 | – | – |
| December | 22 | – | – |
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 | 79.0% | 50.0% | ▼ 36.7% |
| February | 82.4% | – | – |
| March | 90.0% | 50.0% | ▼ 44.4% |
| April | 100.0% | 96.2% | ▼ 3.8% |
| May | 100.0% | 77.4% | ▼ 22.6% |
| June | 76.0% | 100.0% | ▲ 31.6% |
| July | 72.0% | 96.7% | ▲ 34.3% |
| August | 80.0% | – | – |
| September | – | – | – |
| October | 75.9% | – | in progress |
| November | 85.2% | – | – |
| December | 86.4% | – | – |
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 periods17 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 0 | – |
| February | 0 | – | – |
| March | 1 | 0 | ▼ 100.0% |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | – | – | – |
| 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 99.7% 338
- Cancelled 0.3% 1
Share of all recorded flights in the period, all legs. · Oct 13, 2024 → Jul 31, 2026
On time, leg by leg
Departures within 15 minutes of schedule; small figure = departures recorded.
Legs flown under this number
5| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| HOU HRL William P. Hobby Airport – Valley International Airport | 446 | 6.4 min | 86.2% | 58 |
| SNA SJC John Wayne Orange County International Airport – Mineta San Jose International Airport | 550 | -5.0 min | 98.3% | 57 |
| OAK AUS Oakland San Francisco Bay Airport – Austin Bergstrom International Airport | 2,406 | 5.2 min | 93.3% | 45 |
| MDW MSP Chicago Midway International Airport – Minneapolis–Saint Paul International Airport / Wold–Chamberlain Field | 560 | 16.9 min | 68.9% | 45 |
| DEN JAX Denver International Airport – Jacksonville International Airport | 2,325 | 15.0 min | 76.7% | 30 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 10 | 10 | 90.0% | 0 |
| November 2024 | 2 | 2 | 100.0% | 0 |
| December 2024 | 8 | 8 | 87.5% | 0 |
| January 2025 | 19 | 19 | 79.0% | 0 |
| February 2025 | 17 | 17 | 82.4% | 0 |
| March 2025 | 11 | 10 | 90.0% | 1 |
| April 2025 | 5 | 5 | 100.0% | 0 |
| May 2025 | 3 | 3 | 100.0% | 0 |
| June 2025 | 25 | 25 | 76.0% | 0 |
| July 2025 | 25 | 25 | 72.0% | 0 |
| August 2025 | 5 | 5 | 80.0% | 0 |
| October 2025 | 29 | 29 | 75.9% | 0 |
| November 2025 | 27 | 27 | 85.2% | 0 |
| December 2025 | 22 | 22 | 86.4% | 0 |
| January 2026 | 6 | 6 | 50.0% | 0 |
| March 2026 | 8 | 8 | 50.0% | 0 |
| April 2026 | 26 | 26 | 96.2% | 0 |
| May 2026 | 31 | 31 | 77.4% | 0 |
| June 2026 | 30 | 30 | 100.0% | 0 |
| July 2026 | 30 | 30 | 96.7% | 0 |