WN4275
WN4275 (Southwest Airlines) is a multi-stop service on 18 routes, busiest Baltimore to Las Vegas. Of 352 departures recorded from October 2024 to July 2026, 73.6% left on time, according to the US BTS.
- On-time departures73.6%of 352 flights
- Average delay12.4 min
- July 202617
- Cancelled0.0%
- Legs flown under this number18
Recorded departures by month
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods15 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 20 | – | – |
| February | 19 | 1 | ▼ 94.7% |
| March | 32 | 4 | ▼ 87.5% |
| April | 31 | 36 | ▲ 16.1% |
| May | 31 | 44 | ▲ 41.9% |
| June | 4 | 20 | ▲ 400.0% |
| July | – | 17 | – |
| August | 23 | – | – |
| September | 26 | – | – |
| October | 1 | – | in progress |
| November | – | – | – |
| 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 periods15 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 80.0% | – | – |
| February | 68.4% | 100.0% | ▲ 46.2% |
| March | 93.8% | 25.0% | ▼ 73.3% |
| April | 77.4% | 72.2% | ▼ 6.7% |
| May | 48.4% | 81.8% | ▲ 69.1% |
| June | 100.0% | 85.0% | ▼ 15.0% |
| July | – | 70.6% | – |
| August | 56.5% | – | – |
| September | 53.9% | – | – |
| October | 100.0% | – | in progress |
| November | – | – | – |
| 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 periods15 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | – | – |
| February | 0 | 0 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | – | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | – | – | – |
| 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 100.0% 352
- Cancelled 0.0% 0
Share of all recorded flights in the period, all legs. · Oct 13, 2024 → Jul 29, 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 LAS Baltimore/Washington International Thurgood Marshall Airport – Harry Reid International Airport | 3,381 | 10.6 min | 82.0% | 61 |
| BNA MCI Nashville International Airport – Kansas City International Airport | 790 | 16.6 min | 62.1% | 58 |
| SJC SNA Mineta San Jose International Airport – John Wayne Orange County International Airport | 550 | 9.0 min | 77.2% | 57 |
| SFO PHX San Francisco International Airport – Phoenix Sky Harbor International Airport | 1,047 | 25.3 min | 56.0% | 50 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 16 | 16 | 75.0% | 0 |
| November 2024 | 11 | 11 | 100.0% | 0 |
| December 2024 | 16 | 16 | 81.3% | 0 |
| January 2025 | 20 | 20 | 80.0% | 0 |
| February 2025 | 19 | 19 | 68.4% | 0 |
| March 2025 | 32 | 32 | 93.8% | 0 |
| April 2025 | 31 | 31 | 77.4% | 0 |
| May 2025 | 31 | 31 | 48.4% | 0 |
| June 2025 | 4 | 4 | 100.0% | 0 |
| August 2025 | 23 | 23 | 56.5% | 0 |
| September 2025 | 26 | 26 | 53.9% | 0 |
| October 2025 | 1 | 1 | 100.0% | 0 |
| February 2026 | 1 | 1 | 100.0% | 0 |
| March 2026 | 4 | 4 | 25.0% | 0 |
| April 2026 | 36 | 36 | 72.2% | 0 |
| May 2026 | 44 | 44 | 81.8% | 0 |
| June 2026 | 20 | 20 | 85.0% | 0 |
| July 2026 | 17 | 17 | 70.6% | 0 |