WN4737
WN4737 (Southwest Airlines) is a multi-stop service on 12 routes, busiest Houston to Phoenix. Of 266 departures recorded from October 2024 to July 2026, 78.3% left on time, according to the US BTS.
- On-time departures78.3%of 266 flights
- Average delay10.1 min
- July 202621▲ 425.0%vs July 2025
- 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 periods16 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 29 | 2 | ▼ 93.1% |
| February | 24 | 20 | ▼ 16.7% |
| March | 4 | 2 | ▼ 50.0% |
| April | 3 | – | – |
| May | 3 | – | – |
| June | 5 | 20 | ▲ 300.0% |
| July | 4 | 21 | ▲ 425.0% |
| August | 15 | – | – |
| September | 17 | – | – |
| October | – | – | in progress |
| November | 3 | – | – |
| December | 9 | – | – |
according to the US BTS · October 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 periods16 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 60.7% | 50.0% | ▼ 17.6% |
| February | 91.7% | 89.5% | ▼ 2.4% |
| March | 100.0% | 100.0% | 0.0% |
| April | 100.0% | – | – |
| May | 100.0% | – | – |
| June | 100.0% | 80.0% | ▼ 20.0% |
| July | 100.0% | 71.4% | ▼ 28.6% |
| August | 53.3% | – | – |
| September | 58.8% | – | – |
| October | – | – | in progress |
| November | 66.7% | – | – |
| December | 50.0% | – | – |
according to the US BTS · October 2024 → July 2026
Average departure delay by month
Months without data are left blank.
according to the US BTS · October 2024 → July 2026
Cancelled departures by month
Months without data are left blank.
The most recent periods16 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 1 | 0 | ▼ 100.0% |
| February | 0 | 1 | – |
| March | 0 | 0 | – |
| April | 0 | – | – |
| May | 0 | – | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | – | – | in progress |
| November | 0 | – | – |
| December | 1 | – | – |
according to the US BTS · October 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% 263
- Cancelled 1.1% 3
Share of all recorded flights in the period, all legs. · Oct 14, 2024 → Jul 31, 2026
On time, leg by leg
Departures within 15 minutes of schedule; small figure = departures recorded.
Legs flown under this number
3| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| HOU PHX William P. Hobby Airport – Phoenix Sky Harbor International Airport | 1,638 | 7.3 min | 80.6% | 109 |
| BWI MIA Baltimore/Washington International Thurgood Marshall Airport – Miami International Airport | 1,526 | 10.5 min | 75.6% | 41 |
| SJC BUR Mineta San Jose International Airport – Hollywood Burbank/Bob Hope Airport | 477 | 27.8 min | 54.8% | 31 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 14 | 14 | 85.7% | 0 |
| November 2024 | 39 | 39 | 92.3% | 0 |
| December 2024 | 32 | 32 | 78.1% | 0 |
| January 2025 | 29 | 28 | 60.7% | 1 |
| February 2025 | 24 | 24 | 91.7% | 0 |
| March 2025 | 4 | 4 | 100.0% | 0 |
| April 2025 | 3 | 3 | 100.0% | 0 |
| May 2025 | 3 | 3 | 100.0% | 0 |
| June 2025 | 5 | 5 | 100.0% | 0 |
| July 2025 | 4 | 4 | 100.0% | 0 |
| August 2025 | 15 | 15 | 53.3% | 0 |
| September 2025 | 17 | 17 | 58.8% | 0 |
| November 2025 | 3 | 3 | 66.7% | 0 |
| December 2025 | 9 | 8 | 50.0% | 1 |
| January 2026 | 2 | 2 | 50.0% | 0 |
| February 2026 | 20 | 19 | 89.5% | 1 |
| March 2026 | 2 | 2 | 100.0% | 0 |
| June 2026 | 20 | 20 | 80.0% | 0 |
| July 2026 | 21 | 21 | 71.4% | 0 |