WN3900
WN3900 (Southwest Airlines) is a multi-stop service on 19 routes, busiest Houston to Harlingen. Of 586 departures recorded from October 2024 to July 2026, 67.2% left on time, according to the US BTS.
- On-time departures67.2%of 586 flights
- Average delay16.4 min
- July 202614▼ 65.9%vs July 2025
- Cancelled0.5%
- 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 | 31 | 5 | ▼ 83.9% |
| February | 28 | – | – |
| March | 31 | 27 | ▼ 12.9% |
| April | 30 | 51 | ▲ 70.0% |
| May | 31 | 57 | ▲ 83.9% |
| June | 36 | 18 | ▼ 50.0% |
| July | 41 | 14 | ▼ 65.9% |
| August | 4 | – | – |
| September | – | – | – |
| October | 41 | – | in progress |
| November | 30 | – | – |
| December | 30 | – | – |
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 | 86.7% | 80.0% | ▼ 7.7% |
| February | 82.1% | – | – |
| March | 80.7% | 57.7% | ▼ 28.5% |
| April | 80.0% | 23.5% | ▼ 70.6% |
| May | 93.6% | 49.1% | ▼ 47.5% |
| June | 55.6% | 44.4% | ▼ 20.0% |
| July | 63.4% | 50.0% | ▼ 21.1% |
| August | 25.0% | – | – |
| September | – | – | – |
| October | 75.6% | – | in progress |
| November | 93.3% | – | – |
| December | 75.9% | – | – |
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 | 0 | – | – |
| March | 0 | 1 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | – | – | – |
| October | 0 | – | 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 99.5% 583
- Cancelled 0.5% 3
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
7| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| HOU HRL William P. Hobby Airport – Valley International Airport | 446 | 5.3 min | 84.4% | 123 |
| OAK SAN Oakland San Francisco Bay Airport – San Diego International Airport | 718 | 12.8 min | 83.6% | 62 |
| MDW ALB Chicago Midway International Airport – Albany International Airport | 1,152 | 23.2 min | 55.7% | 61 |
| TUS DEN Tucson International Airport – Denver International Airport | 1,029 | 35.3 min | 34.5% | 58 |
| LAS CMH Harry Reid International Airport – John Glenn Columbus International Airport | 2,843 | 6.6 min | 86.2% | 58 |
| SJC LAS Mineta San Jose International Airport – Harry Reid International Airport | 620 | 8.8 min | 75.8% | 33 |
| MCO STL Orlando International Airport – St. Louis Lambert International Airport | 1,420 | 21.1 min | 56.3% | 33 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 21 | 21 | 66.7% | 0 |
| November 2024 | 29 | 29 | 89.7% | 0 |
| December 2024 | 31 | 31 | 74.2% | 0 |
| January 2025 | 31 | 30 | 86.7% | 1 |
| February 2025 | 28 | 28 | 82.1% | 0 |
| March 2025 | 31 | 31 | 80.7% | 0 |
| April 2025 | 30 | 30 | 80.0% | 0 |
| May 2025 | 31 | 31 | 93.6% | 0 |
| June 2025 | 36 | 36 | 55.6% | 0 |
| July 2025 | 41 | 41 | 63.4% | 0 |
| August 2025 | 4 | 4 | 25.0% | 0 |
| October 2025 | 41 | 41 | 75.6% | 0 |
| November 2025 | 30 | 30 | 93.3% | 0 |
| December 2025 | 30 | 29 | 75.9% | 1 |
| January 2026 | 5 | 5 | 80.0% | 0 |
| March 2026 | 27 | 26 | 57.7% | 1 |
| April 2026 | 51 | 51 | 23.5% | 0 |
| May 2026 | 57 | 57 | 49.1% | 0 |
| June 2026 | 18 | 18 | 44.4% | 0 |
| July 2026 | 14 | 14 | 50.0% | 0 |