WN4550
WN4550 (Southwest Airlines) is a multi-stop service on 23 routes, busiest Baltimore to Raleigh. Of 351 departures recorded from October 2024 to July 2026, 84.5% left on time, according to the US BTS.
- On-time departures84.5%of 351 flights
- Average delay5.6 min
- July 202623
- Cancelled0.9%
- Legs flown under this number23
Recorded departures by month
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods16 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 1 | 1 | 0.0% |
| February | – | 1 | – |
| March | – | 27 | – |
| April | 23 | 12 | ▼ 47.8% |
| May | 32 | 9 | ▼ 71.9% |
| June | 4 | 19 | ▲ 375.0% |
| July | – | 23 | – |
| August | 19 | – | – |
| September | 22 | – | – |
| October | 107 | – | in progress |
| November | 18 | – | – |
| December | 7 | – | – |
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 periods16 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 100.0% | 100.0% | 0.0% |
| February | – | 0.0% | – |
| March | – | 80.0% | – |
| April | 69.6% | 75.0% | ▲ 7.8% |
| May | 71.9% | 88.9% | ▲ 23.7% |
| June | 100.0% | 100.0% | 0.0% |
| July | – | 91.3% | – |
| August | 100.0% | – | – |
| September | 95.5% | – | – |
| October | 89.7% | – | in progress |
| November | 77.8% | – | – |
| December | 71.4% | – | – |
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 periods16 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 0 | – |
| February | – | 0 | – |
| March | – | 2 | – |
| 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 99.1% 348
- Cancelled 0.9% 3
Share of all recorded flights in the period, all legs. · Oct 15, 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 |
|---|---|---|---|---|
| BWI RDU Baltimore/Washington International Thurgood Marshall Airport – Raleigh-Durham International Airport | 411 | 7.8 min | 74.1% | 58 |
| RNO LAS Reno Tahoe International Airport – Harry Reid International Airport | 556 | -3.1 min | 97.6% | 42 |
| RDU BWI Raleigh-Durham International Airport – Baltimore/Washington International Thurgood Marshall Airport | 411 | 1.7 min | 95.2% | 42 |
| STL MIA St. Louis Lambert International Airport – Miami International Airport | 1,722 | 9.4 min | 80.7% | 33 |
| FAT DEN Fresno Yosemite International Airport – Denver International Airport | 1,355 | 9.5 min | 80.0% | 30 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 9 | 8 | 75.0% | 1 |
| November 2024 | 13 | 13 | 61.5% | 0 |
| December 2024 | 4 | 4 | 75.0% | 0 |
| January 2025 | 1 | 1 | 100.0% | 0 |
| April 2025 | 23 | 23 | 69.6% | 0 |
| May 2025 | 32 | 32 | 71.9% | 0 |
| June 2025 | 4 | 4 | 100.0% | 0 |
| August 2025 | 19 | 19 | 100.0% | 0 |
| September 2025 | 22 | 22 | 95.5% | 0 |
| October 2025 | 107 | 107 | 89.7% | 0 |
| November 2025 | 18 | 18 | 77.8% | 0 |
| December 2025 | 7 | 7 | 71.4% | 0 |
| January 2026 | 1 | 1 | 100.0% | 0 |
| February 2026 | 1 | 1 | 0.0% | 0 |
| March 2026 | 27 | 25 | 80.0% | 2 |
| April 2026 | 12 | 12 | 75.0% | 0 |
| May 2026 | 9 | 9 | 88.9% | 0 |
| June 2026 | 19 | 19 | 100.0% | 0 |
| July 2026 | 23 | 23 | 91.3% | 0 |