WN1251
WN1251 (Southwest Airlines) is a multi-stop service on 40 routes, busiest Denver to Phoenix. Of 673 departures recorded from October 2024 to July 2026, 76.6% left on time, according to the US BTS.
- On-time departures76.6%of 673 flights
- Average delay10.9 min
- July 202661▲ 177.3%vs July 2025
- Cancelled0.5%
- Legs flown under this number40
according to the US BTS · Oct 12, 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 | 41 | 31 | ▼ 24.4% |
| February | 44 | 25 | ▼ 43.2% |
| March | 39 | 31 | ▼ 20.5% |
| April | 15 | 30 | ▲ 100.0% |
| May | 8 | 34 | ▲ 325.0% |
| June | 19 | 53 | ▲ 178.9% |
| July | 22 | 61 | ▲ 177.3% |
| August | 30 | – | – |
| September | 30 | – | – |
| October | 40 | – | in progress |
| November | 28 | – | – |
| December | 29 | – | – |
| Year to date (Jan–Jul) | 188 | 265 | ▲ 41.0% |
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 | 97.6% | 93.6% | ▼ 4.1% |
| February | 95.5% | 100.0% | ▲ 4.8% |
| March | 89.7% | 60.0% | ▼ 33.1% |
| April | 100.0% | 73.3% | ▼ 26.7% |
| May | 87.5% | 82.4% | ▼ 5.9% |
| June | 63.2% | 34.0% | ▼ 46.2% |
| July | 68.2% | 40.0% | ▼ 41.3% |
| August | 72.4% | – | – |
| September | 80.0% | – | – |
| October | 77.5% | – | in progress |
| November | 96.4% | – | – |
| December | 86.2% | – | – |
| Year-to-date average (Jan–Jul) | 85.9% | 69.0% | ▼ 19.7% |
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 | 0 | – |
| February | 0 | 0 | – |
| March | 0 | 1 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 1 | – |
| August | 1 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 0 | 2 |
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 99.6% 670
- Cancelled 0.4% 3
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
88 of 8
| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| DEN PHX Denver International Airport – Phoenix Sky Harbor International Airport | 968 | -1.7 min | 98.0% | 98 |
| BNA PHL Nashville International Airport – Philadelphia International Airport | 1,084 | 3.9 min | 91.7% | 60 |
| BWI BNA Baltimore/Washington International Thurgood Marshall Airport – Nashville International Airport | 944 | 13.1 min | 77.2% | 58 |
| BWI DJT Baltimore/Washington International Thurgood Marshall Airport – President Donald J. Trump International Airport | 1,425 | 14.0 min | 75.4% | 57 |
| DSM DEN Des Moines International Airport – Denver International Airport | 947 | -0.8 min | 95.7% | 47 |
| DEN CVG Denver International Airport – Cincinnati Northern Kentucky International Airport | 1,716 | 35.9 min | 20.6% | 34 |
| CVG MDW Cincinnati Northern Kentucky International Airport – Chicago Midway International Airport | 401 | 42.6 min | 29.4% | 34 |
| RNO DEN Reno Tahoe International Airport – Denver International Airport | 1,291 | -0.1 min | 97.0% | 33 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 80.0% | 0 |
| November 2024 | 17 | 17 | 82.4% | 0 |
| December 2024 | 26 | 26 | 96.2% | 0 |
| January 2025 | 41 | 41 | 97.6% | 0 |
| February 2025 | 44 | 44 | 95.5% | 0 |
| March 2025 | 39 | 39 | 89.7% | 0 |
| April 2025 | 15 | 15 | 100.0% | 0 |
| May 2025 | 8 | 8 | 87.5% | 0 |
| June 2025 | 19 | 19 | 63.2% | 0 |
| July 2025 | 22 | 22 | 68.2% | 0 |
| August 2025 | 30 | 29 | 72.4% | 1 |
| September 2025 | 30 | 30 | 80.0% | 0 |
| October 2025 | 40 | 40 | 77.5% | 0 |
| November 2025 | 28 | 28 | 96.4% | 0 |
| December 2025 | 29 | 29 | 86.2% | 0 |
| January 2026 | 31 | 31 | 93.6% | 0 |
| February 2026 | 25 | 25 | 100.0% | 0 |
| March 2026 | 31 | 30 | 60.0% | 1 |
| April 2026 | 30 | 30 | 73.3% | 0 |
| May 2026 | 34 | 34 | 82.4% | 0 |
| June 2026 | 53 | 53 | 34.0% | 0 |
| July 2026 | 61 | 60 | 40.0% | 1 |