WN4178
WN4178 (Southwest Airlines) is a multi-stop service on 21 routes, busiest Raleigh to Houston. Of 309 departures recorded from October 2024 to July 2026, 76.5% left on time, according to the US BTS.
- On-time departures76.5%of 309 flights
- Average delay11.4 min
- July 202616
- Cancelled2.3%
- 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 periods18 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 2 | 5 | ▲ 150.0% |
| February | 2 | 14 | ▲ 600.0% |
| March | 9 | 10 | ▲ 11.1% |
| April | 25 | 23 | ▼ 8.0% |
| May | 31 | 25 | ▼ 19.4% |
| June | 4 | 18 | ▲ 350.0% |
| July | – | 16 | – |
| August | 6 | – | – |
| September | 8 | – | – |
| October | 29 | – | in progress |
| November | 29 | – | – |
| December | 31 | – | – |
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 | 100.0% | 100.0% | 0.0% |
| February | 50.0% | 50.0% | 0.0% |
| March | 88.9% | 55.6% | ▼ 37.5% |
| April | 72.0% | 87.0% | ▲ 20.8% |
| May | 58.1% | 76.0% | ▲ 30.9% |
| June | 50.0% | 83.3% | ▲ 66.7% |
| July | – | 100.0% | – |
| August | 100.0% | – | – |
| September | 87.5% | – | – |
| October | 62.1% | – | in progress |
| November | 86.2% | – | – |
| December | 74.2% | – | – |
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 | 1 | 0 | ▼ 100.0% |
| February | 0 | 0 | – |
| March | 0 | 1 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | – | 0 | – |
| 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 97.7% 302
- Cancelled 2.3% 7
Share of all recorded flights in the period, all legs. · Oct 14, 2024 → Jul 29, 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 |
|---|---|---|---|---|
| RDU HOU Raleigh-Durham International Airport – William P. Hobby Airport | 1,688 | 9.2 min | 82.8% | 64 |
| MDW OMA Chicago Midway International Airport – Eppley Airfield | 679 | 19.6 min | 63.8% | 58 |
| MCO MCI Orlando International Airport – Kansas City International Airport | 1,726 | 21.7 min | 60.0% | 30 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 7 | 3 | 100.0% | 4 |
| November 2024 | 10 | 9 | 100.0% | 1 |
| December 2024 | 5 | 5 | 100.0% | 0 |
| January 2025 | 2 | 1 | 100.0% | 1 |
| February 2025 | 2 | 2 | 50.0% | 0 |
| March 2025 | 9 | 9 | 88.9% | 0 |
| April 2025 | 25 | 25 | 72.0% | 0 |
| May 2025 | 31 | 31 | 58.1% | 0 |
| June 2025 | 4 | 4 | 50.0% | 0 |
| August 2025 | 6 | 6 | 100.0% | 0 |
| September 2025 | 8 | 8 | 87.5% | 0 |
| October 2025 | 29 | 29 | 62.1% | 0 |
| November 2025 | 29 | 29 | 86.2% | 0 |
| December 2025 | 31 | 31 | 74.2% | 0 |
| January 2026 | 5 | 5 | 100.0% | 0 |
| February 2026 | 14 | 14 | 50.0% | 0 |
| March 2026 | 10 | 9 | 55.6% | 1 |
| April 2026 | 23 | 23 | 87.0% | 0 |
| May 2026 | 25 | 25 | 76.0% | 0 |
| June 2026 | 18 | 18 | 83.3% | 0 |
| July 2026 | 16 | 16 | 100.0% | 0 |