WN4220
WN4220 (Southwest Airlines) is a multi-stop service on 19 routes, busiest Baltimore to Myrtle Beach. Of 249 departures recorded from October 2024 to July 2026, 66.1% left on time, according to the US BTS.
- On-time departures66.1%of 249 flights
- Average delay19.1 min
- July 202637▲ 60.9%vs July 2025
- Cancelled1.6%
- Legs flown under this number19
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 | 1 | 2 | ▲ 100.0% |
| February | 2 | – | – |
| March | 27 | 27 | 0.0% |
| April | 7 | 6 | ▼ 14.3% |
| May | – | 4 | – |
| June | 18 | 30 | ▲ 66.7% |
| July | 23 | 37 | ▲ 60.9% |
| August | 2 | – | – |
| September | – | – | – |
| October | 16 | – | in progress |
| November | 15 | – | – |
| December | 12 | – | – |
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 | 0.0% | 50.0% | – |
| February | 50.0% | – | – |
| March | 59.3% | 85.2% | ▲ 43.8% |
| April | 100.0% | 83.3% | ▼ 16.7% |
| May | – | 50.0% | – |
| June | 61.1% | 39.3% | ▼ 35.7% |
| July | 69.6% | 51.4% | ▼ 26.1% |
| August | 0.0% | – | – |
| September | – | – | – |
| October | 81.3% | – | in progress |
| November | 73.3% | – | – |
| December | 91.7% | – | – |
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 | 0 | 0 | – |
| February | 0 | – | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | – | 0 | – |
| June | 0 | 2 | – |
| July | 0 | 2 | – |
| August | 0 | – | – |
| September | – | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 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 98.4% 245
- Cancelled 1.6% 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
4| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| BWI MYR Baltimore/Washington International Thurgood Marshall Airport – Myrtle Beach International Airport | 644 | 41.7 min | 42.6% | 50 |
| PHX ELP Phoenix Sky Harbor International Airport – El Paso International Airport | 557 | 23.8 min | 62.8% | 43 |
| LGB SLC Long Beach International Airport – Salt Lake City International Airport | 948 | 5.9 min | 84.9% | 33 |
| BWI SJU Baltimore/Washington International Thurgood Marshall Airport – Luis Munoz Marin International Airport | 2,525 | 13.9 min | 66.7% | 33 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 3 | 3 | 66.7% | 0 |
| November 2024 | 13 | 13 | 92.3% | 0 |
| December 2024 | 4 | 4 | 50.0% | 0 |
| January 2025 | 1 | 1 | 0.0% | 0 |
| February 2025 | 2 | 2 | 50.0% | 0 |
| March 2025 | 27 | 27 | 59.3% | 0 |
| April 2025 | 7 | 7 | 100.0% | 0 |
| June 2025 | 18 | 18 | 61.1% | 0 |
| July 2025 | 23 | 23 | 69.6% | 0 |
| August 2025 | 2 | 2 | 0.0% | 0 |
| October 2025 | 16 | 16 | 81.3% | 0 |
| November 2025 | 15 | 15 | 73.3% | 0 |
| December 2025 | 12 | 12 | 91.7% | 0 |
| January 2026 | 2 | 2 | 50.0% | 0 |
| March 2026 | 27 | 27 | 85.2% | 0 |
| April 2026 | 6 | 6 | 83.3% | 0 |
| May 2026 | 4 | 4 | 50.0% | 0 |
| June 2026 | 30 | 28 | 39.3% | 2 |
| July 2026 | 37 | 35 | 51.4% | 2 |