WN173
WN173 (Southwest Airlines) is a multi-stop service on 38 routes, busiest Phoenix to Denver. Of 775 departures recorded from October 2024 to July 2026, 75.5% left on time, according to the US BTS.
- On-time departures75.5%of 775 flights
- Average delay11.8 min
- July 202631▲ 3.3%vs July 2025
- Cancelled0.7%
- Legs flown under this number38
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 | 33 | 31 | ▼ 6.1% |
| February | 28 | 28 | 0.0% |
| March | 35 | 47 | ▲ 34.3% |
| April | 49 | 34 | ▼ 30.6% |
| May | 59 | 31 | ▼ 47.5% |
| June | 32 | 30 | ▼ 6.3% |
| July | 30 | 31 | ▲ 3.3% |
| August | 33 | – | – |
| September | 34 | – | – |
| October | 31 | – | in progress |
| November | 31 | – | – |
| December | 31 | – | – |
| Year to date (Jan–Jul) | 266 | 232 | ▼ 12.8% |
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 | 72.7% | 100.0% | ▲ 37.5% |
| February | 75.0% | 92.9% | ▲ 23.8% |
| March | 65.7% | 95.7% | ▲ 45.7% |
| April | 77.6% | 64.7% | ▼ 16.6% |
| May | 93.1% | 63.3% | ▼ 32.0% |
| June | 46.9% | 33.3% | ▼ 28.9% |
| July | 63.3% | 51.6% | ▼ 18.5% |
| August | 75.8% | – | – |
| September | 76.5% | – | – |
| October | 58.1% | – | in progress |
| November | 90.0% | – | – |
| December | 87.1% | – | – |
| Year-to-date average (Jan–Jul) | 70.6% | 71.7% | ▲ 1.5% |
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 | 1 | – |
| February | 0 | 0 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 1 | 1 | 0.0% |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 1 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 1 | 2 | ▲ 100.0% |
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 99.4% 770
- Cancelled 0.6% 5
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
99 of 9
| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| PHX DEN Phoenix Sky Harbor International Airport – Denver International Airport | 968 | 10.3 min | 77.3% | 75 |
| ANC DEN Ted Stevens Anchorage International Airport – Denver International Airport | 3,863 | 33.1 min | 43.1% | 58 |
| TPA HOU Tampa International Airport – William P. Hobby Airport | 1,255 | 22.4 min | 59.7% | 58 |
| LAS BUR Harry Reid International Airport – Hollywood Burbank/Bob Hope Airport | 359 | 9.1 min | 79.6% | 50 |
| MHT BWI Manchester-Boston Regional Airport – Baltimore/Washington International Thurgood Marshall Airport | 606 | -6.4 min | 100.0% | 47 |
| HOU GSP William P. Hobby Airport – Greenville-Spartanburg International Airport | 1,358 | 3.2 min | 86.7% | 46 |
| STL OMA St. Louis Lambert International Airport – Eppley Airfield | 549 | 11.2 min | 73.8% | 42 |
| LAS OAK Harry Reid International Airport – Oakland San Francisco Bay Airport | 654 | 16.9 min | 54.6% | 33 |
| DAL SEA Dallas Love Field – Seattle–Tacoma International Airport | 2,685 | 3.8 min | 87.9% | 33 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 23 | 23 | 91.3% | 0 |
| November 2024 | 55 | 54 | 85.2% | 1 |
| December 2024 | 39 | 39 | 74.4% | 0 |
| January 2025 | 33 | 33 | 72.7% | 0 |
| February 2025 | 28 | 28 | 75.0% | 0 |
| March 2025 | 35 | 35 | 65.7% | 0 |
| April 2025 | 49 | 49 | 77.6% | 0 |
| May 2025 | 59 | 58 | 93.1% | 1 |
| June 2025 | 32 | 32 | 46.9% | 0 |
| July 2025 | 30 | 30 | 63.3% | 0 |
| August 2025 | 33 | 33 | 75.8% | 0 |
| September 2025 | 34 | 34 | 76.5% | 0 |
| October 2025 | 31 | 31 | 58.1% | 0 |
| November 2025 | 31 | 30 | 90.0% | 1 |
| December 2025 | 31 | 31 | 87.1% | 0 |
| January 2026 | 31 | 30 | 100.0% | 1 |
| February 2026 | 28 | 28 | 92.9% | 0 |
| March 2026 | 47 | 47 | 95.7% | 0 |
| April 2026 | 34 | 34 | 64.7% | 0 |
| May 2026 | 31 | 30 | 63.3% | 1 |
| June 2026 | 30 | 30 | 33.3% | 0 |
| July 2026 | 31 | 31 | 51.6% | 0 |