WN4199
WN4199 (Southwest Airlines) is a multi-stop service on 18 routes, busiest Washington to Atlanta. Of 513 departures recorded from October 2024 to July 2026, 69.8% left on time, according to the US BTS.
- On-time departures69.8%of 513 flights
- Average delay17.7 min
- July 202632▲ 18.5%vs July 2025
- Cancelled1.4%
- Legs flown under this number18
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 | 33 | 28 | ▼ 15.2% |
| February | 33 | 33 | 0.0% |
| March | 31 | 32 | ▲ 3.2% |
| April | 30 | 6 | ▼ 80.0% |
| May | 31 | – | – |
| June | 26 | 28 | ▲ 7.7% |
| July | 27 | 32 | ▲ 18.5% |
| August | 7 | – | – |
| September | 4 | – | – |
| October | 13 | – | in progress |
| November | 24 | – | – |
| December | 20 | – | – |
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 | 67.9% | 88.5% | ▲ 30.4% |
| February | 51.5% | 75.8% | ▲ 47.0% |
| March | 90.3% | 93.8% | ▲ 3.8% |
| April | 76.7% | 83.3% | ▲ 8.7% |
| May | 58.1% | – | – |
| June | 46.2% | 75.0% | ▲ 62.5% |
| July | 48.2% | 65.6% | ▲ 36.3% |
| August | 42.9% | – | – |
| September | 50.0% | – | – |
| October | 61.5% | – | in progress |
| November | 75.0% | – | – |
| December | 85.0% | – | – |
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 | 5 | 2 | ▼ 60.0% |
| February | 0 | 0 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | – | – |
| June | 0 | 0 | – |
| July | 0 | 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 98.6% 506
- Cancelled 1.4% 7
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 |
|---|---|---|---|---|
| DCA ATL Ronald Reagan Washington National Airport – Hartsfield Jackson Atlanta International Airport | 880 | 27.6 min | 57.0% | 97 |
| MKE DEN General Mitchell International Airport – Denver International Airport | 1,438 | 32.6 min | 62.1% | 58 |
| STL DAL St. Louis Lambert International Airport – Dallas Love Field | 878 | 11.6 min | 84.9% | 55 |
| PHX BNA Phoenix Sky Harbor International Airport – Nashville International Airport | 2,326 | 30.1 min | 46.2% | 52 |
| RSW IND Southwest Florida International Airport – Indianapolis International Airport | 1,525 | 12.4 min | 80.4% | 46 |
| OAK PSP Oakland San Francisco Bay Airport – Palm Springs International Airport | 673 | 15.1 min | 67.7% | 34 |
| HNL OGG Daniel K. Inouye International Airport – Kahului International Airport | 162 | -4.8 min | 100.0% | 32 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 17 | 17 | 88.2% | 0 |
| November 2024 | 28 | 28 | 71.4% | 0 |
| December 2024 | 30 | 30 | 50.0% | 0 |
| January 2025 | 33 | 28 | 67.9% | 5 |
| February 2025 | 33 | 33 | 51.5% | 0 |
| March 2025 | 31 | 31 | 90.3% | 0 |
| April 2025 | 30 | 30 | 76.7% | 0 |
| May 2025 | 31 | 31 | 58.1% | 0 |
| June 2025 | 26 | 26 | 46.2% | 0 |
| July 2025 | 27 | 27 | 48.2% | 0 |
| August 2025 | 7 | 7 | 42.9% | 0 |
| September 2025 | 4 | 4 | 50.0% | 0 |
| October 2025 | 13 | 13 | 61.5% | 0 |
| November 2025 | 24 | 24 | 75.0% | 0 |
| December 2025 | 20 | 20 | 85.0% | 0 |
| January 2026 | 28 | 26 | 88.5% | 2 |
| February 2026 | 33 | 33 | 75.8% | 0 |
| March 2026 | 32 | 32 | 93.8% | 0 |
| April 2026 | 6 | 6 | 83.3% | 0 |
| June 2026 | 28 | 28 | 75.0% | 0 |
| July 2026 | 32 | 32 | 65.6% | 0 |