WN4623
WN4623 (Southwest Airlines) is a multi-stop service on 21 routes, busiest St Louis to New York. Of 508 departures recorded from October 2024 to July 2026, 78.0% left on time, according to the US BTS.
- On-time departures78.0%of 508 flights
- Average delay10.6 min
- July 202630▼ 3.2%vs July 2025
- Cancelled0.8%
- 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 periods17 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 2 | 36 | ▲ 1,700.0% |
| February | – | 33 | – |
| March | – | 17 | – |
| April | 9 | 16 | ▲ 77.8% |
| May | 14 | 18 | ▲ 28.6% |
| June | 27 | 28 | ▲ 3.7% |
| July | 31 | 30 | ▼ 3.2% |
| August | 41 | – | – |
| September | 43 | – | – |
| October | 25 | – | in progress |
| November | 48 | – | – |
| December | 40 | – | – |
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 periods17 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 0.0% | 88.6% | – |
| February | – | 93.9% | – |
| March | – | 88.2% | – |
| April | 44.4% | 75.0% | ▲ 68.8% |
| May | 50.0% | 66.7% | ▲ 33.3% |
| June | 74.1% | 89.3% | ▲ 20.5% |
| July | 71.4% | 96.7% | ▲ 35.3% |
| August | 73.2% | – | – |
| September | 67.4% | – | – |
| October | 68.0% | – | in progress |
| November | 79.2% | – | – |
| December | 75.0% | – | – |
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 periods17 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 1 | – |
| February | – | 0 | – |
| March | – | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 3 | 0 | ▼ 100.0% |
| 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 99.2% 504
- Cancelled 0.8% 4
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 |
|---|---|---|---|---|
| STL LGA St. Louis Lambert International Airport – LaGuardia Airport | 1,426 | 11.7 min | 75.9% | 61 |
| ALB BWI Albany International Airport – Baltimore/Washington International Thurgood Marshall Airport | 464 | 3.7 min | 94.7% | 57 |
| BWI CLE Baltimore/Washington International Thurgood Marshall Airport – Cleveland Hopkins International Airport | 505 | 1.4 min | 90.7% | 55 |
| DAL DCA Dallas Love Field – Ronald Reagan Washington National Airport | 1,902 | 12.2 min | 73.9% | 46 |
| SAN SMF San Diego International Airport – Sacramento International Airport | 773 | 0.4 min | 90.6% | 32 |
| BOS BWI Boston Logan International Airport – Baltimore/Washington International Thurgood Marshall Airport | 594 | 17.4 min | 65.6% | 32 |
| PHX DAL Phoenix Sky Harbor International Airport – Dallas Love Field | 1,412 | 13.4 min | 93.6% | 31 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 12 | 12 | 75.0% | 0 |
| November 2024 | 30 | 30 | 100.0% | 0 |
| December 2024 | 8 | 8 | 50.0% | 0 |
| January 2025 | 2 | 2 | 0.0% | 0 |
| April 2025 | 9 | 9 | 44.4% | 0 |
| May 2025 | 14 | 14 | 50.0% | 0 |
| June 2025 | 27 | 27 | 74.1% | 0 |
| July 2025 | 31 | 28 | 71.4% | 3 |
| August 2025 | 41 | 41 | 73.2% | 0 |
| September 2025 | 43 | 43 | 67.4% | 0 |
| October 2025 | 25 | 25 | 68.0% | 0 |
| November 2025 | 48 | 48 | 79.2% | 0 |
| December 2025 | 40 | 40 | 75.0% | 0 |
| January 2026 | 36 | 35 | 88.6% | 1 |
| February 2026 | 33 | 33 | 93.9% | 0 |
| March 2026 | 17 | 17 | 88.2% | 0 |
| April 2026 | 16 | 16 | 75.0% | 0 |
| May 2026 | 18 | 18 | 66.7% | 0 |
| June 2026 | 28 | 28 | 89.3% | 0 |
| July 2026 | 30 | 30 | 96.7% | 0 |