WN4738
WN4738 (Southwest Airlines) is a multi-stop service on 18 routes, busiest Phoenix to Denver. Of 330 departures recorded from October 2024 to July 2026, 63.9% left on time, according to the US BTS.
- On-time departures63.9%of 330 flights
- Average delay25.4 min
- July 202626▼ 54.4%vs July 2025
- Cancelled0.9%
- Legs flown under this number18
Recorded departures by month
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods14 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 1 | 5 | ▲ 400.0% |
| February | – | 20 | – |
| March | – | 2 | – |
| April | 32 | – | – |
| May | 45 | – | – |
| June | 53 | 23 | ▼ 56.6% |
| July | 57 | 26 | ▼ 54.4% |
| August | 7 | – | – |
| September | – | – | – |
| October | 4 | – | in progress |
| November | 7 | – | – |
| December | 20 | – | – |
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 periods14 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 100.0% | 60.0% | ▼ 40.0% |
| February | – | 80.0% | – |
| March | – | 100.0% | – |
| April | 43.8% | – | – |
| May | 40.0% | – | – |
| June | 65.4% | 87.0% | ▲ 33.0% |
| July | 50.9% | 84.6% | ▲ 66.2% |
| August | 85.7% | – | – |
| September | – | – | – |
| October | 100.0% | – | in progress |
| November | 71.4% | – | – |
| December | 70.0% | – | – |
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 periods14 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 0 | – |
| February | – | 0 | – |
| March | – | 0 | – |
| April | 0 | – | – |
| May | 0 | – | – |
| June | 1 | 0 | ▼ 100.0% |
| July | 2 | 0 | ▼ 100.0% |
| August | 0 | – | – |
| September | – | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
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 99.1% 327
- Cancelled 0.9% 3
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
4| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| PHX DEN Phoenix Sky Harbor International Airport – Denver International Airport | 968 | 52.1 min | 39.7% | 58 |
| MDW BUF Chicago Midway International Airport – Buffalo Niagara International Airport | 752 | 14.9 min | 71.4% | 43 |
| BZN MDW Bozeman Yellowstone International Airport – Chicago Midway International Airport | 1,923 | 2.1 min | 95.2% | 42 |
| BUF PHX Buffalo Niagara International Airport – Phoenix Sky Harbor International Airport | 3,070 | 19.0 min | 61.9% | 42 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 10 | 10 | 60.0% | 0 |
| November 2024 | 14 | 14 | 85.7% | 0 |
| December 2024 | 4 | 4 | 100.0% | 0 |
| January 2025 | 1 | 1 | 100.0% | 0 |
| April 2025 | 32 | 32 | 43.8% | 0 |
| May 2025 | 45 | 45 | 40.0% | 0 |
| June 2025 | 53 | 52 | 65.4% | 1 |
| July 2025 | 57 | 55 | 50.9% | 2 |
| August 2025 | 7 | 7 | 85.7% | 0 |
| October 2025 | 4 | 4 | 100.0% | 0 |
| November 2025 | 7 | 7 | 71.4% | 0 |
| December 2025 | 20 | 20 | 70.0% | 0 |
| January 2026 | 5 | 5 | 60.0% | 0 |
| February 2026 | 20 | 20 | 80.0% | 0 |
| March 2026 | 2 | 2 | 100.0% | 0 |
| June 2026 | 23 | 23 | 87.0% | 0 |
| July 2026 | 26 | 26 | 84.6% | 0 |