WN3912
WN3912 (Southwest Airlines) is a multi-stop service on 20 routes, busiest St Louis to Denver. Of 429 departures recorded from October 2024 to July 2026, 67.5% left on time, according to the US BTS.
- On-time departures67.5%of 429 flights
- Average delay18.1 min
- July 202631▲ 55.0%vs July 2025
- Cancelled0.2%
- Legs flown under this number20
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 | 19 | 3 | ▼ 84.2% |
| February | 9 | 1 | ▼ 88.9% |
| March | 28 | 54 | ▲ 92.9% |
| April | 45 | 26 | ▼ 42.2% |
| May | 54 | 18 | ▼ 66.7% |
| June | 26 | 29 | ▲ 11.5% |
| July | 20 | 31 | ▲ 55.0% |
| August | 4 | – | – |
| September | – | – | – |
| October | – | – | in progress |
| November | 23 | – | – |
| December | 20 | – | – |
| Year to date (Jan–Jul) | 201 | 162 | ▼ 19.4% |
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 | 84.2% | 33.3% | ▼ 60.4% |
| February | 100.0% | 100.0% | 0.0% |
| March | 75.0% | 63.0% | ▼ 16.1% |
| April | 82.2% | 65.4% | ▼ 20.5% |
| May | 75.9% | 38.9% | ▼ 48.8% |
| June | 69.2% | 44.8% | ▼ 35.2% |
| July | 60.0% | 29.0% | ▼ 51.6% |
| August | 50.0% | – | – |
| September | – | – | – |
| October | – | – | in progress |
| November | 86.4% | – | – |
| December | 90.0% | – | – |
| Year-to-date average (Jan–Jul) | 78.1% | 53.5% | ▼ 31.5% |
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 | 0 | – |
| February | 0 | 0 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | – | – | – |
| October | – | – | in progress |
| November | 1 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 0 | 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 99.8% 428
- Cancelled 0.2% 1
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 DEN St. Louis Lambert International Airport – Denver International Airport | 1,236 | 48.2 min | 34.5% | 58 |
| MDW SAT Chicago Midway International Airport – San Antonio International Airport | 1,668 | 21.0 min | 61.4% | 44 |
| OAK SNA Oakland San Francisco Bay Airport – John Wayne Orange County International Airport | 597 | 1.1 min | 90.2% | 41 |
| PHX TUS Phoenix Sky Harbor International Airport – Tucson International Airport | 178 | 21.9 min | 52.9% | 34 |
| MSY MCO Louis Armstrong New Orleans International Airport – Orlando International Airport | 886 | 8.9 min | 76.5% | 34 |
| MCO TYS Orlando International Airport – McGhee Tyson Airport | 859 | 18.3 min | 66.7% | 33 |
| BWI HOU Baltimore/Washington International Thurgood Marshall Airport – William P. Hobby Airport | 2,003 | 19.0 min | 60.6% | 33 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 9 | 9 | 100.0% | 0 |
| November 2024 | 2 | 2 | 100.0% | 0 |
| December 2024 | 8 | 8 | 37.5% | 0 |
| January 2025 | 19 | 19 | 84.2% | 0 |
| February 2025 | 9 | 9 | 100.0% | 0 |
| March 2025 | 28 | 28 | 75.0% | 0 |
| April 2025 | 45 | 45 | 82.2% | 0 |
| May 2025 | 54 | 54 | 75.9% | 0 |
| June 2025 | 26 | 26 | 69.2% | 0 |
| July 2025 | 20 | 20 | 60.0% | 0 |
| August 2025 | 4 | 4 | 50.0% | 0 |
| November 2025 | 23 | 22 | 86.4% | 1 |
| December 2025 | 20 | 20 | 90.0% | 0 |
| January 2026 | 3 | 3 | 33.3% | 0 |
| February 2026 | 1 | 1 | 100.0% | 0 |
| March 2026 | 54 | 54 | 63.0% | 0 |
| April 2026 | 26 | 26 | 65.4% | 0 |
| May 2026 | 18 | 18 | 38.9% | 0 |
| June 2026 | 29 | 29 | 44.8% | 0 |
| July 2026 | 31 | 31 | 29.0% | 0 |