WN4511
WN4511 (Southwest Airlines) is a multi-stop service on 12 routes, busiest Salt Lake City to Denver. Of 274 departures recorded from November 2024 to July 2026, 78.6% left on time, according to the US BTS.
- On-time departures78.6%of 274 flights
- Average delay12.1 min
- July 202627
- Cancelled1.1%
- Legs flown under this number12
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 | 6 | 31 | ▲ 416.7% |
| February | – | 28 | – |
| March | – | 16 | – |
| April | – | 6 | – |
| May | – | 5 | – |
| June | – | 23 | – |
| July | – | 27 | – |
| August | 15 | – | – |
| September | 17 | – | – |
| October | 13 | – | in progress |
| November | 25 | – | – |
| December | 29 | – | – |
according to the US BTS · November 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 | 50.0% | 83.3% | ▲ 66.7% |
| February | – | 70.4% | – |
| March | – | 56.3% | – |
| April | – | 100.0% | – |
| May | – | 100.0% | – |
| June | – | 87.0% | – |
| July | – | 74.1% | – |
| August | 86.7% | – | – |
| September | 94.1% | – | – |
| October | 84.6% | – | in progress |
| November | 100.0% | – | – |
| December | 62.1% | – | – |
according to the US BTS · November 2024 → July 2026
Average departure delay by month
Months without data are left blank.
according to the US BTS · November 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 | 0 | 1 | – |
| February | – | 1 | – |
| March | – | 0 | – |
| April | – | 0 | – |
| May | – | 0 | – |
| June | – | 0 | – |
| July | – | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 1 | – | – |
| December | 0 | – | – |
according to the US BTS · November 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% 271
- Cancelled 1.1% 3
Share of all recorded flights in the period, all legs. · Nov 26, 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 |
|---|---|---|---|---|
| SLC DEN Salt Lake City International Airport – Denver International Airport | 628 | 12.3 min | 79.3% | 59 |
| BWI DTW Baltimore/Washington International Thurgood Marshall Airport – Detroit Metropolitan Wayne County Airport | 657 | 7.4 min | 75.0% | 58 |
| SAN TPA San Diego International Airport – Tampa International Airport | 3,352 | 14.4 min | 80.0% | 50 |
| DEN RDU Denver International Airport – Raleigh-Durham International Airport | 2,307 | 5.6 min | 90.6% | 32 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| November 2024 | 6 | 6 | 100.0% | 0 |
| December 2024 | 27 | 27 | 66.7% | 0 |
| January 2025 | 6 | 6 | 50.0% | 0 |
| August 2025 | 15 | 15 | 86.7% | 0 |
| September 2025 | 17 | 17 | 94.1% | 0 |
| October 2025 | 13 | 13 | 84.6% | 0 |
| November 2025 | 25 | 24 | 100.0% | 1 |
| December 2025 | 29 | 29 | 62.1% | 0 |
| January 2026 | 31 | 30 | 83.3% | 1 |
| February 2026 | 28 | 27 | 70.4% | 1 |
| March 2026 | 16 | 16 | 56.3% | 0 |
| April 2026 | 6 | 6 | 100.0% | 0 |
| May 2026 | 5 | 5 | 100.0% | 0 |
| June 2026 | 23 | 23 | 87.0% | 0 |
| July 2026 | 27 | 27 | 74.1% | 0 |