WN4144
WN4144 (Southwest Airlines) is a multi-stop service on 18 routes, busiest Denver to Baltimore. Of 369 departures recorded from October 2024 to July 2026, 70.4% left on time, according to the US BTS.
- On-time departures70.4%of 369 flights
- Average delay13.8 min
- July 202626▲ 62.5%vs July 2025
- Cancelled1.9%
- Legs flown under this number18
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 | 5 | 26 | ▲ 420.0% |
| February | 11 | 35 | ▲ 218.2% |
| March | 2 | 25 | ▲ 1,150.0% |
| April | 12 | 29 | ▲ 141.7% |
| May | 18 | 30 | ▲ 66.7% |
| June | 18 | 26 | ▲ 44.4% |
| July | 16 | 26 | ▲ 62.5% |
| August | 18 | – | – |
| September | 17 | – | – |
| October | 29 | – | in progress |
| November | 2 | – | – |
| December | – | – | – |
| Year to date (Jan–Jul) | 82 | 197 | ▲ 140.2% |
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 | 100.0% | 87.5% | ▼ 12.5% |
| February | 90.9% | 66.7% | ▼ 26.7% |
| March | 100.0% | 44.0% | ▼ 56.0% |
| April | 75.0% | 58.6% | ▼ 21.8% |
| May | 77.8% | 60.0% | ▼ 22.9% |
| June | 72.2% | 46.2% | ▼ 36.1% |
| July | 93.8% | 41.7% | ▼ 55.6% |
| August | 100.0% | – | – |
| September | 100.0% | – | – |
| October | 69.0% | – | in progress |
| November | 50.0% | – | – |
| December | – | – | – |
| Year-to-date average (Jan–Jul) | 87.1% | 57.8% | ▼ 33.6% |
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 | 1 | 2 | ▲ 100.0% |
| February | 0 | 2 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 2 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | – | – | – |
| Year to date (Jan–Jul) | 1 | 6 | ▲ 500.0% |
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 98.1% 362
- Cancelled 1.9% 7
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 BWI Denver International Airport – Baltimore/Washington International Thurgood Marshall Airport | 2,394 | 11.4 min | 80.0% | 58 |
| SAT ATL San Antonio International Airport – Hartsfield Jackson Atlanta International Airport | 1,405 | 12.2 min | 67.4% | 49 |
| MDW SEA Chicago Midway International Airport – Seattle–Tacoma International Airport | 2,782 | 31.2 min | 42.6% | 49 |
| ONT PHX Ontario International Airport – Phoenix Sky Harbor International Airport | 522 | 5.1 min | 85.7% | 35 |
| PDX LAS Portland International Airport – Harry Reid International Airport | 1,227 | 11.7 min | 75.0% | 32 |
| DTW BWI Detroit Metropolitan Wayne County Airport – Baltimore/Washington International Thurgood Marshall Airport | 657 | -2.7 min | 100.0% | 32 |
| STL DSM St. Louis Lambert International Airport – Des Moines International Airport | 417 | 12.4 min | 70.0% | 30 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 12 | 12 | 83.3% | 0 |
| November 2024 | 3 | 3 | 100.0% | 0 |
| December 2024 | 9 | 9 | 88.9% | 0 |
| January 2025 | 5 | 4 | 100.0% | 1 |
| February 2025 | 11 | 11 | 90.9% | 0 |
| March 2025 | 2 | 2 | 100.0% | 0 |
| April 2025 | 12 | 12 | 75.0% | 0 |
| May 2025 | 18 | 18 | 77.8% | 0 |
| June 2025 | 18 | 18 | 72.2% | 0 |
| July 2025 | 16 | 16 | 93.8% | 0 |
| August 2025 | 18 | 18 | 100.0% | 0 |
| September 2025 | 17 | 17 | 100.0% | 0 |
| October 2025 | 29 | 29 | 69.0% | 0 |
| November 2025 | 2 | 2 | 50.0% | 0 |
| January 2026 | 26 | 24 | 87.5% | 2 |
| February 2026 | 35 | 33 | 66.7% | 2 |
| March 2026 | 25 | 25 | 44.0% | 0 |
| April 2026 | 29 | 29 | 58.6% | 0 |
| May 2026 | 30 | 30 | 60.0% | 0 |
| June 2026 | 26 | 26 | 46.2% | 0 |
| July 2026 | 26 | 24 | 41.7% | 2 |