WN437
WN437 (Southwest Airlines) is a multi-stop service on 36 routes, busiest Las Vegas to Phoenix. Of 752 departures recorded from October 2024 to July 2026, 72.7% left on time, according to the US BTS.
- On-time departures72.7%of 752 flights
- Average delay11.8 min
- July 202651▲ 13.3%vs July 2025
- Cancelled0.7%
- Legs flown under this number36
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 | 28 | 11 | ▼ 60.7% |
| February | 46 | 21 | ▼ 54.3% |
| March | 31 | 25 | ▼ 19.4% |
| April | 47 | 26 | ▼ 44.7% |
| May | 59 | 26 | ▼ 55.9% |
| June | 47 | 45 | ▼ 4.3% |
| July | 45 | 51 | ▲ 13.3% |
| August | 34 | – | – |
| September | 30 | – | – |
| October | 31 | – | in progress |
| November | 39 | – | – |
| December | 45 | – | – |
| Year to date (Jan–Jul) | 303 | 205 | ▼ 32.3% |
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 | 78.6% | 90.9% | ▲ 15.7% |
| February | 77.8% | 95.2% | ▲ 22.4% |
| March | 93.3% | 79.2% | ▼ 15.2% |
| April | 95.7% | 53.9% | ▼ 43.8% |
| May | 98.3% | 53.9% | ▼ 45.2% |
| June | 80.9% | 53.3% | ▼ 34.0% |
| July | 71.1% | 52.9% | ▼ 25.6% |
| August | 82.4% | – | – |
| September | 73.3% | – | – |
| October | 87.1% | – | in progress |
| November | 39.5% | – | – |
| December | 42.2% | – | – |
| Year-to-date average (Jan–Jul) | 85.1% | 68.5% | ▼ 19.5% |
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 | 0 | – |
| February | 1 | 0 | ▼ 100.0% |
| March | 1 | 1 | 0.0% |
| April | 0 | 0 | – |
| May | 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) | 2 | 1 | ▼ 50.0% |
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 99.3% 747
- Cancelled 0.7% 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
88 of 8
| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| LAS PHX Harry Reid International Airport – Phoenix Sky Harbor International Airport | 411 | 12.6 min | 73.8% | 82 |
| AUS SAN Austin Bergstrom International Airport – San Diego International Airport | 1,871 | 26.0 min | 41.3% | 64 |
| ATL PHX Hartsfield Jackson Atlanta International Airport – Phoenix Sky Harbor International Airport | 2,549 | 14.7 min | 65.0% | 60 |
| LAS RNO Harry Reid International Airport – Reno Tahoe International Airport | 556 | -2.2 min | 98.3% | 58 |
| MSY LAS Louis Armstrong New Orleans International Airport – Harry Reid International Airport | 2,409 | 9.0 min | 79.0% | 57 |
| LAX AUS Los Angeles International Airport – Austin Bergstrom International Airport | 1,995 | 22.1 min | 49.0% | 49 |
| HOU BHM William P. Hobby Airport – Birmingham-Shuttlesworth International Airport | 917 | 21.7 min | 59.5% | 42 |
| MCO FLL Orlando International Airport – Fort Lauderdale Hollywood International Airport | 286 | 5.0 min | 83.9% | 31 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 21 | 21 | 61.9% | 0 |
| November 2024 | 17 | 17 | 82.4% | 0 |
| December 2024 | 27 | 26 | 73.1% | 1 |
| January 2025 | 28 | 28 | 78.6% | 0 |
| February 2025 | 46 | 45 | 77.8% | 1 |
| March 2025 | 31 | 30 | 93.3% | 1 |
| April 2025 | 47 | 47 | 95.7% | 0 |
| May 2025 | 59 | 59 | 98.3% | 0 |
| June 2025 | 47 | 47 | 80.9% | 0 |
| July 2025 | 45 | 45 | 71.1% | 0 |
| August 2025 | 34 | 34 | 82.4% | 0 |
| September 2025 | 30 | 30 | 73.3% | 0 |
| October 2025 | 31 | 31 | 87.1% | 0 |
| November 2025 | 39 | 38 | 39.5% | 1 |
| December 2025 | 45 | 45 | 42.2% | 0 |
| January 2026 | 11 | 11 | 90.9% | 0 |
| February 2026 | 21 | 21 | 95.2% | 0 |
| March 2026 | 25 | 24 | 79.2% | 1 |
| April 2026 | 26 | 26 | 53.9% | 0 |
| May 2026 | 26 | 26 | 53.9% | 0 |
| June 2026 | 45 | 45 | 53.3% | 0 |
| July 2026 | 51 | 51 | 52.9% | 0 |