WN4840
WN4840 (Southwest Airlines) is a multi-stop service on 7 routes, busiest St Louis to Las Vegas. Of 220 departures recorded from October 2024 to July 2026, 62.8% left on time, according to the US BTS.
- On-time departures62.8%of 220 flights
- Average delay26.3 min
- July 202630
- Cancelled2.3%
- Legs flown under this number7
Recorded departures by month
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods11 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 28 | 3 | ▼ 89.3% |
| February | 28 | – | – |
| March | 5 | – | – |
| April | 12 | – | – |
| May | 18 | – | – |
| June | 2 | 27 | ▲ 1,250.0% |
| July | – | 30 | – |
| August | – | – | – |
| September | – | – | – |
| October | – | – | in progress |
| November | 5 | – | – |
| December | 11 | – | – |
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 periods11 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 70.4% | 66.7% | ▼ 5.3% |
| February | 75.0% | – | – |
| March | 80.0% | – | – |
| April | 45.5% | – | – |
| May | 61.1% | – | – |
| June | 0.0% | 50.0% | – |
| July | – | 43.3% | – |
| August | – | – | – |
| September | – | – | – |
| October | – | – | in progress |
| November | 80.0% | – | – |
| December | 22.2% | – | – |
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 periods11 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 1 | 0 | ▼ 100.0% |
| February | 0 | – | – |
| March | 0 | – | – |
| April | 1 | – | – |
| May | 0 | – | – |
| June | 0 | 1 | – |
| July | – | 0 | – |
| August | – | – | – |
| September | – | – | – |
| October | – | – | in progress |
| November | 0 | – | – |
| December | 2 | – | – |
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 97.7% 215
- Cancelled 2.3% 5
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
3| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| STL LAS St. Louis Lambert International Airport – Harry Reid International Airport | 2,202 | 15.3 min | 74.0% | 101 |
| MCO ISP Orlando International Airport – Long Island MacArthur Airport | 1,565 | 35.3 min | 46.4% | 57 |
| AUS DEN Austin Bergstrom International Airport – Denver International Airport | 1,249 | 41.9 min | 51.6% | 32 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 10 | 10 | 100.0% | 0 |
| November 2024 | 23 | 23 | 87.0% | 0 |
| December 2024 | 18 | 18 | 61.1% | 0 |
| January 2025 | 28 | 27 | 70.4% | 1 |
| February 2025 | 28 | 28 | 75.0% | 0 |
| March 2025 | 5 | 5 | 80.0% | 0 |
| April 2025 | 12 | 11 | 45.5% | 1 |
| May 2025 | 18 | 18 | 61.1% | 0 |
| June 2025 | 2 | 2 | 0.0% | 0 |
| November 2025 | 5 | 5 | 80.0% | 0 |
| December 2025 | 11 | 9 | 22.2% | 2 |
| January 2026 | 3 | 3 | 66.7% | 0 |
| June 2026 | 27 | 26 | 50.0% | 1 |
| July 2026 | 30 | 30 | 43.3% | 0 |