WN4022
WN4022 (Southwest Airlines) is a multi-stop service on 24 routes, busiest Denver to Dulles. Of 475 departures recorded from October 2024 to July 2026, 62.4% left on time, according to the US BTS.
- On-time departures62.4%of 475 flights
- Average delay22.6 min
- July 202617▼ 45.2%vs July 2025
- Cancelled0.4%
- Legs flown under this number24
Recorded departures by month
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods18 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 27 | 29 | ▲ 7.4% |
| February | 24 | 35 | ▲ 45.8% |
| March | 8 | 44 | ▲ 450.0% |
| April | 28 | 12 | ▼ 57.1% |
| May | 40 | 6 | ▼ 85.0% |
| June | 30 | 16 | ▼ 46.7% |
| July | 31 | 17 | ▼ 45.2% |
| August | 4 | – | – |
| September | – | – | – |
| October | 8 | – | in progress |
| November | 25 | – | – |
| December | 20 | – | – |
| Year to date (Jan–Jul) | 188 | 159 | ▼ 15.4% |
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 periods18 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 66.7% | 82.8% | ▲ 24.1% |
| February | 58.3% | 51.4% | ▼ 11.8% |
| March | 87.5% | 58.1% | ▼ 33.6% |
| April | 67.9% | 83.3% | ▲ 22.8% |
| May | 37.5% | 16.7% | ▼ 55.5% |
| June | 60.0% | 50.0% | ▼ 16.7% |
| July | 48.4% | 70.6% | ▲ 45.9% |
| August | 50.0% | – | – |
| September | – | – | – |
| October | 75.0% | – | in progress |
| November | 44.0% | – | – |
| December | 94.7% | – | – |
| Year-to-date average (Jan–Jul) | 60.9% | 59.0% | ▼ 3.1% |
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 periods18 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 0 | – |
| February | 0 | 0 | – |
| March | 0 | 1 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | – | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 1 | – | – |
| Year to date (Jan–Jul) | 0 | 1 |
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 99.6% 473
- Cancelled 0.4% 2
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
7| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| DEN IAD Denver International Airport – Washington Dulles International Airport | 2,332 | 11.5 min | 69.9% | 93 |
| MTJ DEN Montrose Regional Airport – Denver International Airport | 316 | 47.6 min | 50.8% | 61 |
| SFO PHX San Francisco International Airport – Phoenix Sky Harbor International Airport | 1,047 | 21.1 min | 67.3% | 55 |
| PHX AUS Phoenix Sky Harbor International Airport – Austin Bergstrom International Airport | 1,401 | 26.4 min | 66.7% | 42 |
| SAN OAK San Diego International Airport – Oakland San Francisco Bay Airport | 718 | 26.4 min | 40.0% | 40 |
| TPA FLL Tampa International Airport – Fort Lauderdale Hollywood International Airport | 317 | 17.5 min | 60.6% | 33 |
| MIA BWI Miami International Airport – Baltimore/Washington International Thurgood Marshall Airport | 1,526 | 29.8 min | 59.4% | 33 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 19 | 19 | 84.2% | 0 |
| November 2024 | 25 | 25 | 84.0% | 0 |
| December 2024 | 27 | 27 | 63.0% | 0 |
| January 2025 | 27 | 27 | 66.7% | 0 |
| February 2025 | 24 | 24 | 58.3% | 0 |
| March 2025 | 8 | 8 | 87.5% | 0 |
| April 2025 | 28 | 28 | 67.9% | 0 |
| May 2025 | 40 | 40 | 37.5% | 0 |
| June 2025 | 30 | 30 | 60.0% | 0 |
| July 2025 | 31 | 31 | 48.4% | 0 |
| August 2025 | 4 | 4 | 50.0% | 0 |
| October 2025 | 8 | 8 | 75.0% | 0 |
| November 2025 | 25 | 25 | 44.0% | 0 |
| December 2025 | 20 | 19 | 94.7% | 1 |
| January 2026 | 29 | 29 | 82.8% | 0 |
| February 2026 | 35 | 35 | 51.4% | 0 |
| March 2026 | 44 | 43 | 58.1% | 1 |
| April 2026 | 12 | 12 | 83.3% | 0 |
| May 2026 | 6 | 6 | 16.7% | 0 |
| June 2026 | 16 | 16 | 50.0% | 0 |
| July 2026 | 17 | 17 | 70.6% | 0 |