WN4159
WN4159 (Southwest Airlines) is a multi-stop service on 15 routes, busiest Atlanta to Baltimore. Of 421 departures recorded from October 2024 to July 2026, 66.3% left on time, according to the US BTS.
- On-time departures66.3%of 421 flights
- Average delay17.8 min
- July 202643▲ 95.5%vs July 2025
- Cancelled1.4%
- Legs flown under this number15
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 | – | 11 | – |
| February | 2 | 16 | ▲ 700.0% |
| March | 15 | 29 | ▲ 93.3% |
| April | 16 | 33 | ▲ 106.3% |
| May | 18 | 36 | ▲ 100.0% |
| June | 20 | 42 | ▲ 110.0% |
| July | 22 | 43 | ▲ 95.5% |
| August | 29 | – | – |
| September | 30 | – | – |
| October | 1 | – | in progress |
| November | 22 | – | – |
| December | 18 | – | – |
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% | – |
| February | 50.0% | 46.7% | ▼ 6.7% |
| March | 73.3% | 37.9% | ▼ 48.3% |
| April | 75.0% | 69.7% | ▼ 7.1% |
| May | 52.9% | 80.6% | ▲ 52.2% |
| June | 60.0% | 41.5% | ▼ 30.9% |
| July | 54.6% | 33.3% | ▼ 38.9% |
| August | 93.1% | – | – |
| September | 96.7% | – | – |
| October | 100.0% | – | in progress |
| November | 81.8% | – | – |
| December | 94.4% | – | – |
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 periods18 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | – | 2 | – |
| February | 0 | 1 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 1 | 0 | ▼ 100.0% |
| June | 0 | 1 | – |
| July | 0 | 1 | – |
| 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 98.6% 415
- Cancelled 1.4% 6
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
8| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| BNA MCO Nashville International Airport – Orlando International Airport | 993 | 10.1 min | 77.6% | 58 |
| ATL BWI Hartsfield Jackson Atlanta International Airport – Baltimore/Washington International Thurgood Marshall Airport | 928 | -0.3 min | 96.6% | 58 |
| PIT DEN Pittsburgh International Airport – Denver International Airport | 2,071 | 4.3 min | 88.1% | 42 |
| ORF BNA Norfolk International Airport – Nashville International Airport | 940 | 24.1 min | 54.8% | 42 |
| DTW STL Detroit Metropolitan Wayne County Airport – St. Louis Lambert International Airport | 707 | 40.9 min | 38.1% | 42 |
| PDX DAL Portland International Airport – Dallas Love Field | 2,614 | 22.8 min | 36.4% | 33 |
| BWI DTW Baltimore/Washington International Thurgood Marshall Airport – Detroit Metropolitan Wayne County Airport | 657 | 39.1 min | 35.5% | 33 |
| STL TUL St. Louis Lambert International Airport – Tulsa International Airport | 563 | 17.9 min | 67.7% | 32 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 16 | 16 | 87.5% | 0 |
| November 2024 | 2 | 2 | 100.0% | 0 |
| February 2025 | 2 | 2 | 50.0% | 0 |
| March 2025 | 15 | 15 | 73.3% | 0 |
| April 2025 | 16 | 16 | 75.0% | 0 |
| May 2025 | 18 | 17 | 52.9% | 1 |
| June 2025 | 20 | 20 | 60.0% | 0 |
| July 2025 | 22 | 22 | 54.6% | 0 |
| August 2025 | 29 | 29 | 93.1% | 0 |
| September 2025 | 30 | 30 | 96.7% | 0 |
| October 2025 | 1 | 1 | 100.0% | 0 |
| November 2025 | 22 | 22 | 81.8% | 0 |
| December 2025 | 18 | 18 | 94.4% | 0 |
| January 2026 | 11 | 9 | 100.0% | 2 |
| February 2026 | 16 | 15 | 46.7% | 1 |
| March 2026 | 29 | 29 | 37.9% | 0 |
| April 2026 | 33 | 33 | 69.7% | 0 |
| May 2026 | 36 | 36 | 80.6% | 0 |
| June 2026 | 42 | 41 | 41.5% | 1 |
| July 2026 | 43 | 42 | 33.3% | 1 |