WN4126
WN4126 (Southwest Airlines) is a multi-stop service on 28 routes, busiest Baltimore to Islip. Of 490 departures recorded from October 2024 to July 2026, 73.3% left on time, according to the US BTS.
- On-time departures73.3%of 490 flights
- Average delay16.3 min
- July 202644
- Cancelled1.4%
- Legs flown under this number28
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 | 3 | 53 | ▲ 1,666.7% |
| February | 8 | 52 | ▲ 550.0% |
| March | 35 | 35 | 0.0% |
| April | 29 | 30 | ▲ 3.4% |
| May | 28 | 30 | ▲ 7.1% |
| June | 3 | 42 | ▲ 1,300.0% |
| July | – | 44 | – |
| August | 19 | – | – |
| September | 21 | – | – |
| October | 1 | – | in progress |
| November | 6 | – | – |
| December | 17 | – | – |
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% | 95.9% | ▼ 4.1% |
| February | 75.0% | 82.7% | ▲ 10.3% |
| March | 54.3% | 80.0% | ▲ 47.4% |
| April | 72.4% | 96.7% | ▲ 33.5% |
| May | 71.4% | 93.3% | ▲ 30.7% |
| June | 66.7% | 54.8% | ▼ 17.9% |
| July | – | 52.4% | – |
| August | 73.7% | – | – |
| September | 76.2% | – | – |
| October | 100.0% | – | in progress |
| November | 50.0% | – | – |
| December | 52.9% | – | – |
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 periods18 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 1 | 4 | ▲ 300.0% |
| February | 0 | 0 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | – | 2 | – |
| 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% 483
- 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
6| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| SAN SMF San Diego International Airport – Sacramento International Airport | 773 | -0.7 min | 96.5% | 57 |
| BWI ISP Baltimore/Washington International Thurgood Marshall Airport – Long Island MacArthur Airport | 353 | 27.3 min | 58.2% | 57 |
| ISP DJT Long Island MacArthur Airport – President Donald J. Trump International Airport | 1,696 | 26.6 min | 68.0% | 50 |
| TUL PHX Tulsa International Airport – Phoenix Sky Harbor International Airport | 1,501 | 3.5 min | 92.3% | 41 |
| STL RDU St. Louis Lambert International Airport – Raleigh-Durham International Airport | 1,072 | 5.9 min | 81.8% | 33 |
| DAL ELP Dallas Love Field – El Paso International Airport | 902 | 20.8 min | 63.6% | 33 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 16 | 16 | 68.8% | 0 |
| November 2024 | 6 | 6 | 83.3% | 0 |
| December 2024 | 12 | 12 | 41.7% | 0 |
| January 2025 | 3 | 2 | 100.0% | 1 |
| February 2025 | 8 | 8 | 75.0% | 0 |
| March 2025 | 35 | 35 | 54.3% | 0 |
| April 2025 | 29 | 29 | 72.4% | 0 |
| May 2025 | 28 | 28 | 71.4% | 0 |
| June 2025 | 3 | 3 | 66.7% | 0 |
| August 2025 | 19 | 19 | 73.7% | 0 |
| September 2025 | 21 | 21 | 76.2% | 0 |
| October 2025 | 1 | 1 | 100.0% | 0 |
| November 2025 | 6 | 6 | 50.0% | 0 |
| December 2025 | 17 | 17 | 52.9% | 0 |
| January 2026 | 53 | 49 | 95.9% | 4 |
| February 2026 | 52 | 52 | 82.7% | 0 |
| March 2026 | 35 | 35 | 80.0% | 0 |
| April 2026 | 30 | 30 | 96.7% | 0 |
| May 2026 | 30 | 30 | 93.3% | 0 |
| June 2026 | 42 | 42 | 54.8% | 0 |
| July 2026 | 44 | 42 | 52.4% | 2 |