WN424
WN424 (Southwest Airlines) is a multi-stop service on 32 routes, busiest San Juan to Baltimore. Of 651 departures recorded from October 2024 to July 2026, 77.8% left on time, according to the US BTS.
- On-time departures77.8%of 651 flights
- Average delay12.0 min
- July 202631▲ 14.8%vs July 2025
- Cancelled1.1%
- Legs flown under this number32
Recorded departures by month
All legs under this number combined; see the leg table.
The most recent periods19 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 31 | 30 | ▼ 3.2% |
| February | 28 | 25 | ▼ 10.7% |
| March | 31 | 31 | 0.0% |
| April | 30 | 20 | ▼ 33.3% |
| May | 31 | 20 | ▼ 35.5% |
| June | 26 | 29 | ▲ 11.5% |
| July | 27 | 31 | ▲ 14.8% |
| August | 42 | – | – |
| September | 43 | – | – |
| October | 39 | – | in progress |
| November | 27 | – | – |
| December | 27 | – | – |
| Year to date (Jan–Jul) | 204 | 186 | ▼ 8.8% |
according to the US BTS · October 2024 → July 2026
On-time departures by month
On time = departure within 15 minutes of schedule. Non-cancelled flights with a recorded delay only.
The most recent periods19 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 90.0% | 96.6% | ▲ 7.3% |
| February | 96.4% | 87.5% | ▼ 9.3% |
| March | 96.8% | 54.8% | ▼ 43.3% |
| April | 100.0% | 80.0% | ▼ 20.0% |
| May | 100.0% | 55.0% | ▼ 45.0% |
| June | 56.0% | 48.3% | ▼ 13.8% |
| July | 57.7% | 29.0% | ▼ 49.7% |
| August | 76.2% | – | – |
| September | 69.8% | – | – |
| October | 76.9% | – | in progress |
| November | 92.3% | – | – |
| December | 66.7% | – | – |
| Year-to-date average (Jan–Jul) | 85.3% | 64.5% | ▼ 24.4% |
according to the US BTS · October 2024 → July 2026
Average departure delay by month
according to the US BTS · October 2024 → July 2026
Cancelled departures by month
The most recent periods19 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 1 | 1 | 0.0% |
| February | 0 | 1 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 1 | 0 | ▼ 100.0% |
| June | 1 | 0 | ▼ 100.0% |
| July | 1 | 0 | ▼ 100.0% |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 1 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 4 | 2 | ▼ 50.0% |
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 98.9% 644
- Cancelled 1.1% 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 |
|---|---|---|---|---|
| SJU BWI Luis Munoz Marin International Airport – Baltimore/Washington International Thurgood Marshall Airport | 2,525 | 0.7 min | 94.3% | 123 |
| BNA DAL Nashville International Airport – Dallas Love Field | 1,000 | -4.4 min | 100.0% | 58 |
| MDW SAT Chicago Midway International Airport – San Antonio International Airport | 1,668 | 8.0 min | 81.5% | 55 |
| TUS LAS Tucson International Airport – Harry Reid International Airport | 587 | 11.6 min | 83.3% | 42 |
| BDL BWI Bradley International Airport – Baltimore/Washington International Thurgood Marshall Airport | 455 | -0.6 min | 94.9% | 41 |
| HOU MDW William P. Hobby Airport – Chicago Midway International Airport | 1,510 | -0.5 min | 100.0% | 33 |
| BUR STS Hollywood Burbank/Bob Hope Airport – Charles M. Schulz Sonoma County Airport | 623 | 35.9 min | 39.4% | 33 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 85.0% | 0 |
| November 2024 | 30 | 30 | 96.7% | 0 |
| December 2024 | 33 | 33 | 97.0% | 0 |
| January 2025 | 31 | 30 | 90.0% | 1 |
| February 2025 | 28 | 28 | 96.4% | 0 |
| March 2025 | 31 | 31 | 96.8% | 0 |
| April 2025 | 30 | 30 | 100.0% | 0 |
| May 2025 | 31 | 30 | 100.0% | 1 |
| June 2025 | 26 | 25 | 56.0% | 1 |
| July 2025 | 27 | 26 | 57.7% | 1 |
| August 2025 | 42 | 42 | 76.2% | 0 |
| September 2025 | 43 | 43 | 69.8% | 0 |
| October 2025 | 39 | 39 | 76.9% | 0 |
| November 2025 | 27 | 26 | 92.3% | 1 |
| December 2025 | 27 | 27 | 66.7% | 0 |
| January 2026 | 30 | 29 | 96.6% | 1 |
| February 2026 | 25 | 24 | 87.5% | 1 |
| March 2026 | 31 | 31 | 54.8% | 0 |
| April 2026 | 20 | 20 | 80.0% | 0 |
| May 2026 | 20 | 20 | 55.0% | 0 |
| June 2026 | 29 | 29 | 48.3% | 0 |
| July 2026 | 31 | 31 | 29.0% | 0 |