WN4152
WN4152 (Southwest Airlines) is a multi-stop service on 15 routes, busiest San Diego to Denver. Of 228 departures recorded from October 2024 to July 2026, 59.9% left on time, according to the US BTS.
- On-time departures59.9%of 228 flights
- Average delay26.6 min
- July 202627▲ 125.0%vs July 2025
- Cancelled0.4%
- Legs flown under this number15
Recorded departures by month
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods13 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | – | – | – |
| February | 2 | – | – |
| March | 27 | 5 | ▼ 81.5% |
| April | 27 | 14 | ▼ 48.1% |
| May | 26 | 17 | ▼ 34.6% |
| June | 16 | 28 | ▲ 75.0% |
| July | 12 | 27 | ▲ 125.0% |
| August | 2 | – | – |
| September | – | – | – |
| October | – | – | in progress |
| November | – | – | – |
| December | 2 | – | – |
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 periods13 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | – | – | – |
| February | 100.0% | – | – |
| March | 74.1% | 40.0% | ▼ 46.0% |
| April | 92.6% | 21.4% | ▼ 76.9% |
| May | 80.8% | 29.4% | ▼ 63.6% |
| June | 81.3% | 25.9% | ▼ 68.1% |
| July | 83.3% | 29.6% | ▼ 64.4% |
| August | 100.0% | – | – |
| September | – | – | – |
| October | – | – | in progress |
| November | – | – | – |
| December | 50.0% | – | – |
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 periods13 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | – | – | – |
| February | 0 | – | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 1 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | – | – | – |
| October | – | – | in progress |
| November | – | – | – |
| 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 99.6% 227
- Cancelled 0.4% 1
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 |
|---|---|---|---|---|
| SAN DEN San Diego International Airport – Denver International Airport | 1,371 | 38.7 min | 28.3% | 54 |
| SAV BWI Savannah Hilton Head International Airport – Baltimore/Washington International Thurgood Marshall Airport | 884 | 11.4 min | 88.0% | 50 |
| DJT BWI President Donald J. Trump International Airport – Baltimore/Washington International Thurgood Marshall Airport | 1,425 | 34.0 min | 75.8% | 33 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 22 | 22 | 77.3% | 0 |
| November 2024 | 1 | 1 | 0.0% | 0 |
| February 2025 | 2 | 2 | 100.0% | 0 |
| March 2025 | 27 | 27 | 74.1% | 0 |
| April 2025 | 27 | 27 | 92.6% | 0 |
| May 2025 | 26 | 26 | 80.8% | 0 |
| June 2025 | 16 | 16 | 81.3% | 0 |
| July 2025 | 12 | 12 | 83.3% | 0 |
| August 2025 | 2 | 2 | 100.0% | 0 |
| December 2025 | 2 | 2 | 50.0% | 0 |
| March 2026 | 5 | 5 | 40.0% | 0 |
| April 2026 | 14 | 14 | 21.4% | 0 |
| May 2026 | 17 | 17 | 29.4% | 0 |
| June 2026 | 28 | 27 | 25.9% | 1 |
| July 2026 | 27 | 27 | 29.6% | 0 |