WN4140
WN4140 (Southwest Airlines) is a multi-stop service on 16 routes, busiest West Palm Beach to Baltimore. Of 511 departures recorded from October 2024 to July 2026, 71.3% left on time, according to the US BTS.
- On-time departures71.3%of 511 flights
- Average delay14.5 min
- July 202618▼ 10.0%vs July 2025
- Cancelled0.6%
- Legs flown under this number16
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 | 31 | 5 | ▼ 83.9% |
| February | 28 | 18 | ▼ 35.7% |
| March | 5 | 17 | ▲ 240.0% |
| April | 23 | 26 | ▲ 13.0% |
| May | 31 | 31 | 0.0% |
| June | 24 | 19 | ▼ 20.8% |
| July | 20 | 18 | ▼ 10.0% |
| August | 49 | – | – |
| September | 51 | – | – |
| October | 32 | – | in progress |
| November | 2 | – | – |
| December | – | – | – |
| Year to date (Jan–Jul) | 162 | 134 | ▼ 17.3% |
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 | 73.3% | 100.0% | ▲ 36.4% |
| February | 67.9% | 88.9% | ▲ 31.0% |
| March | 80.0% | 81.3% | ▲ 1.6% |
| April | 95.7% | 88.5% | ▼ 7.5% |
| May | 58.1% | 96.8% | ▲ 66.7% |
| June | 62.5% | 21.1% | ▼ 66.3% |
| July | 80.0% | 5.9% | ▼ 92.7% |
| August | 85.7% | – | – |
| September | 72.6% | – | – |
| October | 50.0% | – | in progress |
| November | 50.0% | – | – |
| December | – | – | – |
| Year-to-date average (Jan–Jul) | 73.9% | 68.9% | ▼ 6.8% |
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 | 0 | ▼ 100.0% |
| February | 0 | 0 | – |
| March | 0 | 1 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 1 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | – | – | – |
| Year to date (Jan–Jul) | 1 | 2 | ▲ 100.0% |
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 99.4% 508
- Cancelled 0.6% 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
8| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| DJT BWI President Donald J. Trump International Airport – Baltimore/Washington International Thurgood Marshall Airport | 1,425 | 15.1 min | 69.4% | 122 |
| PSP SMF Palm Springs International Airport – Sacramento International Airport | 707 | 14.5 min | 77.6% | 58 |
| STS SAN Charles M. Schulz Sonoma County Airport – San Diego International Airport | 819 | -0.1 min | 93.0% | 57 |
| STL OKC St. Louis Lambert International Airport – OKC Will Rogers World Airport | 742 | 10.5 min | 76.0% | 50 |
| ONT OAK Ontario International Airport – Oakland San Francisco Bay Airport | 582 | 19.2 min | 68.6% | 35 |
| MDW ATL Chicago Midway International Airport – Hartsfield Jackson Atlanta International Airport | 952 | 47.5 min | 6.1% | 34 |
| DEN PSP Denver International Airport – Palm Springs International Airport | 1,247 | 19.3 min | 75.8% | 33 |
| PHL DAL Philadelphia International Airport – Dallas Love Field | 2,080 | 20.1 min | 48.4% | 31 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 80.0% | 0 |
| November 2024 | 29 | 29 | 75.9% | 0 |
| December 2024 | 32 | 32 | 62.5% | 0 |
| January 2025 | 31 | 30 | 73.3% | 1 |
| February 2025 | 28 | 28 | 67.9% | 0 |
| March 2025 | 5 | 5 | 80.0% | 0 |
| April 2025 | 23 | 23 | 95.7% | 0 |
| May 2025 | 31 | 31 | 58.1% | 0 |
| June 2025 | 24 | 24 | 62.5% | 0 |
| July 2025 | 20 | 20 | 80.0% | 0 |
| August 2025 | 49 | 49 | 85.7% | 0 |
| September 2025 | 51 | 51 | 72.6% | 0 |
| October 2025 | 32 | 32 | 50.0% | 0 |
| November 2025 | 2 | 2 | 50.0% | 0 |
| January 2026 | 5 | 5 | 100.0% | 0 |
| February 2026 | 18 | 18 | 88.9% | 0 |
| March 2026 | 17 | 16 | 81.3% | 1 |
| April 2026 | 26 | 26 | 88.5% | 0 |
| May 2026 | 31 | 31 | 96.8% | 0 |
| June 2026 | 19 | 19 | 21.1% | 0 |
| July 2026 | 18 | 17 | 5.9% | 1 |