WN4525
WN4525 (Southwest Airlines) is a multi-stop service on 18 routes, busiest Denver to Salt Lake City. Of 514 departures recorded from October 2024 to July 2026, 69.6% left on time, according to the US BTS.
- On-time departures69.6%of 514 flights
- Average delay16.1 min
- July 202630▼ 6.3%vs July 2025
- Cancelled1.6%
- Legs flown under this number18
according to the US BTS · Oct 13, 2024 → Jul 31, 2026 domestic flights only
Recorded departures by month
Partial coverage: domestic flights only · 22 of 22 periods have data
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 | 31 | 28 | ▼ 9.7% |
| February | 26 | 34 | ▲ 30.8% |
| March | 4 | 32 | ▲ 700.0% |
| April | 12 | 27 | ▲ 125.0% |
| May | 17 | 26 | ▲ 52.9% |
| June | 26 | 30 | ▲ 15.4% |
| July | 32 | 30 | ▼ 6.3% |
| August | 29 | – | – |
| September | 30 | – | – |
| October | 23 | – | in progress |
| November | 2 | – | – |
| December | 3 | – | – |
| Year to date (Jan–Jul) | 148 | 207 | ▲ 39.9% |
according to the US BTS · October 2024 → July 2026
On-time departures by month
Partial coverage: domestic flights only · 22 of 22 periods have data
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 | 74.2% | 80.0% | ▲ 7.8% |
| February | 57.7% | 67.7% | ▲ 17.3% |
| March | 100.0% | 90.3% | ▼ 9.7% |
| April | 63.6% | 66.7% | ▲ 4.8% |
| May | 82.4% | 65.4% | ▼ 20.6% |
| June | 76.9% | 43.3% | ▼ 43.7% |
| July | 90.0% | 50.0% | ▼ 44.4% |
| August | 93.1% | – | – |
| September | 80.0% | – | – |
| October | 65.2% | – | in progress |
| November | 0.0% | – | – |
| December | 33.3% | – | – |
| Year-to-date average (Jan–Jul) | 77.8% | 66.2% | ▼ 14.9% |
according to the US BTS · October 2024 → July 2026
Average departure delay by month
Partial coverage: domestic flights only · 22 of 22 periods have data
according to the US BTS · October 2024 → July 2026
Cancelled departures by month
Partial coverage: domestic flights only · 22 of 22 periods have data
The most recent periods19 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 3 | – |
| February | 0 | 0 | – |
| March | 0 | 1 | – |
| April | 1 | 0 | ▼ 100.0% |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 2 | 0 | ▼ 100.0% |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 3 | 4 | ▲ 33.3% |
according to the US BTS · October 2024 → July 2026
This is not a forecast
This is a historical record of departures already flown, not a forecast for your flight.
This number flies several legs
Several legs: the headline figure averages all of them. See the leg table.
Cancellation share
- Not cancelled 98.4% 506
- Cancelled 1.6% 8
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
88 of 8
| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| DEN SLC Denver International Airport – Salt Lake City International Airport | 628 | 19.4 min | 63.0% | 92 |
| DAL CMH Dallas Love Field – John Glenn Columbus International Airport | 1,478 | 11.5 min | 87.9% | 58 |
| BNA PVD Nashville International Airport – Rhode Island T. F. Green International Airport | 1,456 | 27.4 min | 47.4% | 57 |
| ELP DAL El Paso International Airport – Dallas Love Field | 902 | 11.3 min | 74.5% | 53 |
| SJC SNA Mineta San Jose International Airport – John Wayne Orange County International Airport | 550 | 3.4 min | 87.5% | 42 |
| SRQ BWI Sarasota Bradenton International Airport – Baltimore/Washington International Thurgood Marshall Airport | 1,419 | 2.1 min | 96.9% | 33 |
| STS SAN Charles M. Schulz Sonoma County Airport – San Diego International Airport | 819 | 22.6 min | 62.5% | 32 |
| RNO SAN Reno Tahoe International Airport – San Diego International Airport | 787 | 10.1 min | 73.3% | 31 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 16 | 16 | 75.0% | 0 |
| November 2024 | 26 | 25 | 56.0% | 1 |
| December 2024 | 30 | 30 | 50.0% | 0 |
| January 2025 | 31 | 31 | 74.2% | 0 |
| February 2025 | 26 | 26 | 57.7% | 0 |
| March 2025 | 4 | 4 | 100.0% | 0 |
| April 2025 | 12 | 11 | 63.6% | 1 |
| May 2025 | 17 | 17 | 82.4% | 0 |
| June 2025 | 26 | 26 | 76.9% | 0 |
| July 2025 | 32 | 30 | 90.0% | 2 |
| August 2025 | 29 | 29 | 93.1% | 0 |
| September 2025 | 30 | 30 | 80.0% | 0 |
| October 2025 | 23 | 23 | 65.2% | 0 |
| November 2025 | 2 | 2 | 0.0% | 0 |
| December 2025 | 3 | 3 | 33.3% | 0 |
| January 2026 | 28 | 25 | 80.0% | 3 |
| February 2026 | 34 | 34 | 67.7% | 0 |
| March 2026 | 32 | 31 | 90.3% | 1 |
| April 2026 | 27 | 27 | 66.7% | 0 |
| May 2026 | 26 | 26 | 65.4% | 0 |
| June 2026 | 30 | 30 | 43.3% | 0 |
| July 2026 | 30 | 30 | 50.0% | 0 |