WN4039
WN4039 (Southwest Airlines) is a multi-stop service on 24 routes, busiest Baltimore to Las Vegas. Of 427 departures recorded from October 2024 to July 2026, 73.4% left on time, according to the US BTS.
- On-time departures73.4%of 427 flights
- Average delay12.7 min
- July 20264▼ 88.6%vs July 2025
- Cancelled0.5%
- Legs flown under this number24
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 | 18 | 18 | 0.0% |
| February | 19 | 23 | ▲ 21.1% |
| March | 30 | 29 | ▼ 3.3% |
| April | 16 | 30 | ▲ 87.5% |
| May | 12 | 31 | ▲ 158.3% |
| June | 32 | 7 | ▼ 78.1% |
| July | 35 | 4 | ▼ 88.6% |
| August | 20 | – | – |
| September | 17 | – | – |
| October | 17 | – | in progress |
| November | 27 | – | – |
| December | 29 | – | – |
| Year to date (Jan–Jul) | 162 | 142 | ▼ 12.3% |
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 | 87.5% | 88.9% | ▲ 1.6% |
| February | 94.7% | 91.3% | ▼ 3.6% |
| March | 83.3% | 79.3% | ▼ 4.8% |
| April | 100.0% | 60.0% | ▼ 40.0% |
| May | 83.3% | 64.5% | ▼ 22.6% |
| June | 90.6% | 57.1% | ▼ 37.0% |
| July | 80.0% | 100.0% | ▲ 25.0% |
| August | 70.0% | – | – |
| September | 70.6% | – | – |
| October | 29.4% | – | in progress |
| November | 40.7% | – | – |
| December | 44.8% | – | – |
| Year-to-date average (Jan–Jul) | 88.5% | 77.3% | ▼ 12.6% |
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 | 2 | 0 | ▼ 100.0% |
| February | 0 | 0 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 2 | 0 | ▼ 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 99.5% 425
- Cancelled 0.5% 2
Share of all recorded flights in the period, all legs. · Oct 14, 2024 → Jul 25, 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 |
|---|---|---|---|---|
| BWI LAS Baltimore/Washington International Thurgood Marshall Airport – Harry Reid International Airport | 3,381 | 4.6 min | 88.5% | 61 |
| PHL STL Philadelphia International Airport – St. Louis Lambert International Airport | 1,306 | 24.0 min | 45.0% | 60 |
| RSW IND Southwest Florida International Airport – Indianapolis International Airport | 1,525 | 18.0 min | 63.8% | 58 |
| OAK GEG Oakland San Francisco Bay Airport – Spokane International Airport | 1,165 | 3.1 min | 84.9% | 33 |
| LGB LAS Long Beach International Airport – Harry Reid International Airport | 372 | 17.2 min | 72.7% | 33 |
| DEN AUS Denver International Airport – Austin Bergstrom International Airport | 1,249 | 29.0 min | 65.6% | 32 |
| SJC SAN Mineta San Jose International Airport – San Diego International Airport | 671 | -0.5 min | 93.3% | 30 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 8 | 8 | 100.0% | 0 |
| November 2024 | 3 | 3 | 66.7% | 0 |
| December 2024 | 2 | 2 | 50.0% | 0 |
| January 2025 | 18 | 16 | 87.5% | 2 |
| February 2025 | 19 | 19 | 94.7% | 0 |
| March 2025 | 30 | 30 | 83.3% | 0 |
| April 2025 | 16 | 16 | 100.0% | 0 |
| May 2025 | 12 | 12 | 83.3% | 0 |
| June 2025 | 32 | 32 | 90.6% | 0 |
| July 2025 | 35 | 35 | 80.0% | 0 |
| August 2025 | 20 | 20 | 70.0% | 0 |
| September 2025 | 17 | 17 | 70.6% | 0 |
| October 2025 | 17 | 17 | 29.4% | 0 |
| November 2025 | 27 | 27 | 40.7% | 0 |
| December 2025 | 29 | 29 | 44.8% | 0 |
| January 2026 | 18 | 18 | 88.9% | 0 |
| February 2026 | 23 | 23 | 91.3% | 0 |
| March 2026 | 29 | 29 | 79.3% | 0 |
| April 2026 | 30 | 30 | 60.0% | 0 |
| May 2026 | 31 | 31 | 64.5% | 0 |
| June 2026 | 7 | 7 | 57.1% | 0 |
| July 2026 | 4 | 4 | 100.0% | 0 |