WN4230
WN4230 (Southwest Airlines) is a multi-stop service on 24 routes, busiest Miami to Baltimore. Of 314 departures recorded from October 2024 to July 2026, 64.2% left on time, according to the US BTS.
- On-time departures64.2%of 314 flights
- Average delay20.2 min
- July 202630▲ 30.4%vs July 2025
- Cancelled1.3%
- 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 periods16 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 25 | 5 | ▼ 80.0% |
| February | 28 | 15 | ▼ 46.4% |
| March | 17 | 2 | ▼ 88.2% |
| April | 3 | – | – |
| May | – | 3 | – |
| June | 18 | 15 | ▼ 16.7% |
| July | 23 | 30 | ▲ 30.4% |
| August | 43 | – | – |
| September | 47 | – | – |
| October | 17 | – | in progress |
| November | 5 | – | – |
| December | – | – | – |
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 periods16 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 75.0% | 80.0% | ▲ 6.7% |
| February | 74.1% | 46.7% | ▼ 37.0% |
| March | 76.5% | 50.0% | ▼ 34.6% |
| April | 33.3% | – | – |
| May | – | 100.0% | – |
| June | 61.1% | 60.0% | ▼ 1.8% |
| July | 26.1% | 56.7% | ▲ 117.2% |
| August | 55.8% | – | – |
| September | 68.9% | – | – |
| October | 82.4% | – | in progress |
| November | 80.0% | – | – |
| December | – | – | – |
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 periods16 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 1 | 0 | ▼ 100.0% |
| February | 1 | 0 | ▼ 100.0% |
| March | 0 | 0 | – |
| April | 0 | – | – |
| May | – | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 2 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | – | – | – |
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 98.7% 310
- Cancelled 1.3% 4
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
3| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| MIA BWI Miami International Airport – Baltimore/Washington International Thurgood Marshall Airport | 1,526 | 7.5 min | 76.7% | 62 |
| SJC SAN Mineta San Jose International Airport – San Diego International Airport | 671 | 14.6 min | 71.4% | 58 |
| PHX HOU Phoenix Sky Harbor International Airport – William P. Hobby Airport | 1,638 | 35.5 min | 42.9% | 42 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 9 | 9 | 77.8% | 0 |
| November 2024 | 5 | 5 | 100.0% | 0 |
| December 2024 | 4 | 4 | 100.0% | 0 |
| January 2025 | 25 | 24 | 75.0% | 1 |
| February 2025 | 28 | 27 | 74.1% | 1 |
| March 2025 | 17 | 17 | 76.5% | 0 |
| April 2025 | 3 | 3 | 33.3% | 0 |
| June 2025 | 18 | 18 | 61.1% | 0 |
| July 2025 | 23 | 23 | 26.1% | 0 |
| August 2025 | 43 | 43 | 55.8% | 0 |
| September 2025 | 47 | 45 | 68.9% | 2 |
| October 2025 | 17 | 17 | 82.4% | 0 |
| November 2025 | 5 | 5 | 80.0% | 0 |
| January 2026 | 5 | 5 | 80.0% | 0 |
| February 2026 | 15 | 15 | 46.7% | 0 |
| March 2026 | 2 | 2 | 50.0% | 0 |
| May 2026 | 3 | 3 | 100.0% | 0 |
| June 2026 | 15 | 15 | 60.0% | 0 |
| July 2026 | 30 | 30 | 56.7% | 0 |