WN4323
WN4323 (Southwest Airlines) is a multi-stop service on 19 routes, busiest Las Vegas to St Louis. Of 444 departures recorded from October 2024 to July 2026, 74.5% left on time, according to the US BTS.
- On-time departures74.5%of 444 flights
- Average delay12.2 min
- July 202627
- Cancelled1.8%
- Legs flown under this number19
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 | 27 | 30 | ▲ 11.1% |
| February | 26 | 28 | ▲ 7.7% |
| March | 25 | 28 | ▲ 12.0% |
| April | 20 | 6 | ▼ 70.0% |
| May | 23 | – | – |
| June | 2 | 23 | ▲ 1,050.0% |
| July | – | 27 | – |
| August | 8 | – | – |
| September | 8 | – | – |
| October | 30 | – | in progress |
| November | 29 | – | – |
| December | 33 | – | – |
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 | 88.5% | 77.8% | ▼ 12.1% |
| February | 88.5% | 92.9% | ▲ 5.0% |
| March | 84.0% | 50.0% | ▼ 40.5% |
| April | 80.0% | 83.3% | ▲ 4.2% |
| May | 52.2% | – | – |
| June | 100.0% | 30.4% | ▼ 69.6% |
| July | – | 38.5% | – |
| August | 87.5% | – | – |
| September | 100.0% | – | – |
| October | 60.0% | – | in progress |
| November | 85.7% | – | – |
| December | 100.0% | – | – |
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 | 1 | 3 | ▲ 200.0% |
| February | 0 | 0 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | – | – |
| June | 0 | 0 | – |
| July | – | 1 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 1 | – | – |
| 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 98.2% 436
- Cancelled 1.8% 8
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
6| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| LAS STL Harry Reid International Airport – St. Louis Lambert International Airport | 2,202 | 3.6 min | 88.3% | 78 |
| CMH PHX John Glenn Columbus International Airport – Phoenix Sky Harbor International Airport | 2,682 | 9.2 min | 85.0% | 63 |
| BWI MSY Baltimore/Washington International Thurgood Marshall Airport – Louis Armstrong New Orleans International Airport | 1,607 | 31.2 min | 34.7% | 50 |
| LAS TUL Harry Reid International Airport – Tulsa International Airport | 1,727 | 19.4 min | 65.0% | 40 |
| RNO LAS Reno Tahoe International Airport – Harry Reid International Airport | 556 | 29.8 min | 61.3% | 31 |
| MKE DEN General Mitchell International Airport – Denver International Airport | 1,438 | 15.2 min | 75.0% | 30 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 19 | 19 | 84.2% | 0 |
| November 2024 | 26 | 25 | 84.0% | 1 |
| December 2024 | 26 | 25 | 72.0% | 1 |
| January 2025 | 27 | 26 | 88.5% | 1 |
| February 2025 | 26 | 26 | 88.5% | 0 |
| March 2025 | 25 | 25 | 84.0% | 0 |
| April 2025 | 20 | 20 | 80.0% | 0 |
| May 2025 | 23 | 23 | 52.2% | 0 |
| June 2025 | 2 | 2 | 100.0% | 0 |
| August 2025 | 8 | 8 | 87.5% | 0 |
| September 2025 | 8 | 8 | 100.0% | 0 |
| October 2025 | 30 | 30 | 60.0% | 0 |
| November 2025 | 29 | 28 | 85.7% | 1 |
| December 2025 | 33 | 33 | 100.0% | 0 |
| January 2026 | 30 | 27 | 77.8% | 3 |
| February 2026 | 28 | 28 | 92.9% | 0 |
| March 2026 | 28 | 28 | 50.0% | 0 |
| April 2026 | 6 | 6 | 83.3% | 0 |
| June 2026 | 23 | 23 | 30.4% | 0 |
| July 2026 | 27 | 26 | 38.5% | 1 |