WN4027
WN4027 (Southwest Airlines) is a multi-stop service on 21 routes, busiest Jacksonville to Baltimore. Of 385 departures recorded from October 2024 to July 2026, 85.9% left on time, according to the US BTS.
- On-time departures85.9%of 385 flights
- Average delay6.7 min
- July 202627▲ 575.0%vs July 2025
- Cancelled0.8%
- Legs flown under this number21
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 | 19 | 22 | ▲ 15.8% |
| February | 19 | 34 | ▲ 78.9% |
| March | 4 | 5 | ▲ 25.0% |
| April | 23 | 27 | ▲ 17.4% |
| May | 31 | 36 | ▲ 16.1% |
| June | 8 | 26 | ▲ 225.0% |
| July | 4 | 27 | ▲ 575.0% |
| August | 1 | – | – |
| September | – | – | – |
| October | 50 | – | in progress |
| November | 3 | – | – |
| December | 1 | – | – |
| Year to date (Jan–Jul) | 108 | 177 | ▲ 63.9% |
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 | 94.7% | 90.5% | ▼ 4.5% |
| February | 79.0% | 91.2% | ▲ 15.5% |
| March | 100.0% | 80.0% | ▼ 20.0% |
| April | 87.0% | 81.5% | ▼ 6.3% |
| May | 80.0% | 75.0% | ▼ 6.3% |
| June | 62.5% | 73.1% | ▲ 16.9% |
| July | 100.0% | 88.9% | ▼ 11.1% |
| August | 100.0% | – | – |
| September | – | – | – |
| October | 98.0% | – | in progress |
| November | 66.7% | – | – |
| December | 100.0% | – | – |
| Year-to-date average (Jan–Jul) | 86.2% | 82.9% | ▼ 3.8% |
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 | 0 | 1 | – |
| February | 0 | 0 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 1 | 0 | ▼ 100.0% |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | – | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 1 | 1 | 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 99.2% 382
- Cancelled 0.8% 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
5| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| RNO SAN Reno Tahoe International Airport – San Diego International Airport | 787 | 10.2 min | 77.6% | 58 |
| JAX BWI Jacksonville International Airport – Baltimore/Washington International Thurgood Marshall Airport | 1,068 | 7.7 min | 82.5% | 58 |
| DEN SLC Denver International Airport – Salt Lake City International Airport | 628 | 8.4 min | 80.0% | 50 |
| SJC LAS Mineta San Jose International Airport – Harry Reid International Airport | 620 | 1.3 min | 89.5% | 39 |
| OAK SEA Oakland San Francisco Bay Airport – Seattle–Tacoma International Airport | 1,082 | -3.1 min | 100.0% | 30 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 10 | 10 | 90.0% | 0 |
| November 2024 | 27 | 26 | 92.3% | 1 |
| December 2024 | 8 | 8 | 75.0% | 0 |
| January 2025 | 19 | 19 | 94.7% | 0 |
| February 2025 | 19 | 19 | 79.0% | 0 |
| March 2025 | 4 | 4 | 100.0% | 0 |
| April 2025 | 23 | 23 | 87.0% | 0 |
| May 2025 | 31 | 30 | 80.0% | 1 |
| June 2025 | 8 | 8 | 62.5% | 0 |
| July 2025 | 4 | 4 | 100.0% | 0 |
| August 2025 | 1 | 1 | 100.0% | 0 |
| October 2025 | 50 | 50 | 98.0% | 0 |
| November 2025 | 3 | 3 | 66.7% | 0 |
| December 2025 | 1 | 1 | 100.0% | 0 |
| January 2026 | 22 | 21 | 90.5% | 1 |
| February 2026 | 34 | 34 | 91.2% | 0 |
| March 2026 | 5 | 5 | 80.0% | 0 |
| April 2026 | 27 | 27 | 81.5% | 0 |
| May 2026 | 36 | 36 | 75.0% | 0 |
| June 2026 | 26 | 26 | 73.1% | 0 |
| July 2026 | 27 | 27 | 88.9% | 0 |