WN3433
WN3433 (Southwest Airlines) is a multi-stop service on 33 routes, busiest St Louis to Denver. Of 682 departures recorded from October 2024 to July 2026, 72.3% left on time, according to the US BTS.
- On-time departures72.3%of 682 flights
- Average delay15.7 min
- July 202631▼ 39.2%vs July 2025
- Cancelled0.4%
- Legs flown under this number33
according to the US BTS · Oct 12, 2024 → Jul 31, 2026 domestic flights only
Recorded departures by month
Partial coverage: domestic flights only · 22 of 22 periods have data
All legs under this number combined; see the leg table.
The most recent periods19 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 28 | 3 | ▼ 89.3% |
| February | 26 | 3 | ▼ 88.5% |
| March | 90 | 27 | ▼ 70.0% |
| April | 25 | 54 | ▲ 116.0% |
| May | 3 | 62 | ▲ 1,966.7% |
| June | 47 | 33 | ▼ 29.8% |
| July | 51 | 31 | ▼ 39.2% |
| August | 31 | – | – |
| September | 25 | – | – |
| October | 50 | – | in progress |
| November | 24 | – | – |
| December | 20 | – | – |
| Year to date (Jan–Jul) | 270 | 213 | ▼ 21.1% |
according to the US BTS · October 2024 → July 2026
On-time departures by month
Partial coverage: domestic flights only · 22 of 22 periods have data
On time = departure within 15 minutes of schedule. Non-cancelled flights with a recorded delay only.
The most recent periods19 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 75.0% | 66.7% | ▼ 11.1% |
| February | 76.9% | 100.0% | ▲ 30.0% |
| March | 64.4% | 29.6% | ▼ 54.0% |
| April | 60.0% | 79.6% | ▲ 32.7% |
| May | 100.0% | 74.2% | ▼ 25.8% |
| June | 66.0% | 87.9% | ▲ 33.2% |
| July | 49.0% | 87.1% | ▲ 77.8% |
| August | 64.5% | – | – |
| September | 76.0% | – | – |
| October | 96.0% | – | in progress |
| November | 78.3% | – | – |
| December | 70.0% | – | – |
| Year-to-date average (Jan–Jul) | 70.2% | 75.0% | ▲ 6.9% |
according to the US BTS · October 2024 → July 2026
Average departure delay by month
Partial coverage: domestic flights only · 22 of 22 periods have data
according to the US BTS · October 2024 → July 2026
Cancelled departures by month
Partial coverage: domestic flights only · 22 of 22 periods have data
The most recent periods19 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 0 | – |
| February | 0 | 0 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 2 | 0 | ▼ 100.0% |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 1 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 2 | 0 | ▼ 100.0% |
according to the US BTS · October 2024 → July 2026
This is not a forecast
This is a historical record of departures already flown, not a forecast for your flight.
This number flies several legs
Several legs: the headline figure averages all of them. See the leg table.
Cancellation share
- Not cancelled 99.6% 679
- Cancelled 0.4% 3
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
88 of 8
| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| STL DEN St. Louis Lambert International Airport – Denver International Airport | 1,236 | 8.3 min | 85.5% | 62 |
| CVG BWI Cincinnati Northern Kentucky International Airport – Baltimore/Washington International Thurgood Marshall Airport | 690 | 38.6 min | 54.2% | 61 |
| SMF LAS Sacramento International Airport – Harry Reid International Airport | 639 | 2.1 min | 91.2% | 57 |
| LAS DCA Harry Reid International Airport – Ronald Reagan Washington National Airport | 3,354 | 16.0 min | 66.7% | 57 |
| DEN GEG Denver International Airport – Spokane International Airport | 1,343 | 3.4 min | 90.5% | 42 |
| LGA DEN LaGuardia Airport – Denver International Airport | 2,600 | 11.3 min | 75.0% | 41 |
| SMF SEA Sacramento International Airport – Seattle–Tacoma International Airport | 975 | 5.0 min | 82.5% | 40 |
| HOU MDW William P. Hobby Airport – Chicago Midway International Airport | 1,510 | 43.2 min | 30.3% | 33 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 80.0% | 0 |
| November 2024 | 13 | 13 | 100.0% | 0 |
| December 2024 | 16 | 16 | 81.3% | 0 |
| January 2025 | 28 | 28 | 75.0% | 0 |
| February 2025 | 26 | 26 | 76.9% | 0 |
| March 2025 | 90 | 90 | 64.4% | 0 |
| April 2025 | 25 | 25 | 60.0% | 0 |
| May 2025 | 3 | 3 | 100.0% | 0 |
| June 2025 | 47 | 47 | 66.0% | 0 |
| July 2025 | 51 | 49 | 49.0% | 2 |
| August 2025 | 31 | 31 | 64.5% | 0 |
| September 2025 | 25 | 25 | 76.0% | 0 |
| October 2025 | 50 | 50 | 96.0% | 0 |
| November 2025 | 24 | 23 | 78.3% | 1 |
| December 2025 | 20 | 20 | 70.0% | 0 |
| January 2026 | 3 | 3 | 66.7% | 0 |
| February 2026 | 3 | 3 | 100.0% | 0 |
| March 2026 | 27 | 27 | 29.6% | 0 |
| April 2026 | 54 | 54 | 79.6% | 0 |
| May 2026 | 62 | 62 | 74.2% | 0 |
| June 2026 | 33 | 33 | 87.9% | 0 |
| July 2026 | 31 | 31 | 87.1% | 0 |