WN4517
WN4517 (Southwest Airlines) is a multi-stop service on 19 routes, busiest Denver to Charleston. Of 335 departures recorded from October 2024 to July 2026, 69.1% left on time, according to the US BTS.
- On-time departures69.1%of 335 flights
- Average delay15.1 min
- July 202623▲ 2,200.0%vs July 2025
- Cancelled0.6%
- 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 | 24 | ▲ 2,300.0% |
| February | – | 27 | – |
| March | 14 | 16 | ▲ 14.3% |
| April | 4 | 24 | ▲ 500.0% |
| May | – | 25 | – |
| June | – | 22 | – |
| July | 1 | 23 | ▲ 2,200.0% |
| August | 24 | – | – |
| September | 26 | – | – |
| October | 32 | – | in progress |
| November | 25 | – | – |
| December | 21 | – | – |
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 | 100.0% | 79.2% | ▼ 20.8% |
| February | – | 51.9% | – |
| March | 84.6% | 81.3% | ▼ 4.0% |
| April | 75.0% | 58.3% | ▼ 22.2% |
| May | – | 64.0% | – |
| June | – | 59.1% | – |
| July | 100.0% | 69.6% | ▼ 30.4% |
| August | 87.5% | – | – |
| September | 96.2% | – | – |
| October | 43.8% | – | in progress |
| November | 58.3% | – | – |
| December | 47.6% | – | – |
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 | 1 | 0 | ▼ 100.0% |
| April | 0 | 0 | – |
| May | – | 0 | – |
| June | – | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 1 | – | – |
| 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 99.4% 333
- Cancelled 0.6% 2
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
4| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| DEN CHS Denver International Airport – Charleston International Airport | 2,328 | 13.3 min | 67.9% | 53 |
| STL SAT St. Louis Lambert International Airport – San Antonio International Airport | 1,266 | 16.6 min | 61.2% | 49 |
| OAK SAN Oakland San Francisco Bay Airport – San Diego International Airport | 718 | 19.3 min | 54.6% | 45 |
| HOU LGA William P. Hobby Airport – LaGuardia Airport | 2,295 | -0.4 min | 97.6% | 42 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 100.0% | 0 |
| November 2024 | 4 | 4 | 100.0% | 0 |
| December 2024 | 2 | 2 | 50.0% | 0 |
| January 2025 | 1 | 1 | 100.0% | 0 |
| March 2025 | 14 | 13 | 84.6% | 1 |
| April 2025 | 4 | 4 | 75.0% | 0 |
| July 2025 | 1 | 1 | 100.0% | 0 |
| August 2025 | 24 | 24 | 87.5% | 0 |
| September 2025 | 26 | 26 | 96.2% | 0 |
| October 2025 | 32 | 32 | 43.8% | 0 |
| November 2025 | 25 | 24 | 58.3% | 1 |
| December 2025 | 21 | 21 | 47.6% | 0 |
| January 2026 | 24 | 24 | 79.2% | 0 |
| February 2026 | 27 | 27 | 51.9% | 0 |
| March 2026 | 16 | 16 | 81.3% | 0 |
| April 2026 | 24 | 24 | 58.3% | 0 |
| May 2026 | 25 | 25 | 64.0% | 0 |
| June 2026 | 22 | 22 | 59.1% | 0 |
| July 2026 | 23 | 23 | 69.6% | 0 |