WN4271
WN4271 (Southwest Airlines) is a multi-stop service on 17 routes, busiest Pittsburgh to Phoenix. Of 495 departures recorded from October 2024 to July 2026, 72.0% left on time, according to the US BTS.
- On-time departures72.0%of 495 flights
- Average delay13.6 min
- July 202631▼ 8.8%vs July 2025
- Cancelled0.6%
- Legs flown under this number17
Recorded departures by month
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 | 1 | 31 | ▲ 3,000.0% |
| February | 2 | 25 | ▲ 1,150.0% |
| March | 1 | 4 | ▲ 300.0% |
| April | 20 | 18 | ▼ 10.0% |
| May | 27 | 21 | ▼ 22.2% |
| June | 33 | 30 | ▼ 9.1% |
| July | 34 | 31 | ▼ 8.8% |
| August | 32 | – | – |
| September | 30 | – | – |
| October | 1 | – | in progress |
| November | 53 | – | – |
| December | 62 | – | – |
| Year to date (Jan–Jul) | 118 | 160 | ▲ 35.6% |
according to the US BTS · October 2024 → July 2026
On-time departures by month
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 | 0.0% | 67.7% | – |
| February | 50.0% | 68.0% | ▲ 36.0% |
| March | 100.0% | 100.0% | 0.0% |
| April | 60.0% | 94.1% | ▲ 56.9% |
| May | 63.0% | 100.0% | ▲ 58.8% |
| June | 72.7% | 56.7% | ▼ 22.1% |
| July | 70.6% | 71.0% | ▲ 0.5% |
| August | 75.0% | – | – |
| September | 60.0% | – | – |
| October | 100.0% | – | in progress |
| November | 67.9% | – | – |
| December | 73.8% | – | – |
| Year-to-date average (Jan–Jul) | 59.5% | 79.6% | ▲ 33.9% |
according to the US BTS · October 2024 → July 2026
Average departure delay by month
according to the US BTS · October 2024 → July 2026
Cancelled departures by month
The most recent periods19 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 0 | – |
| February | 0 | 0 | – |
| March | 0 | 0 | – |
| April | 0 | 1 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 1 | – | – |
| Year to date (Jan–Jul) | 0 | 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 99.4% 492
- Cancelled 0.6% 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
7| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| PIT PHX Pittsburgh International Airport – Phoenix Sky Harbor International Airport | 2,912 | 11.6 min | 71.7% | 60 |
| SFO BWI San Francisco International Airport – Baltimore/Washington International Thurgood Marshall Airport | 3,944 | 16.5 min | 69.0% | 58 |
| DEN PDX Denver International Airport – Portland International Airport | 1,592 | 14.6 min | 63.8% | 58 |
| DEN SNA Denver International Airport – John Wayne Orange County International Airport | 1,360 | 9.1 min | 72.7% | 55 |
| LAS SNA Harry Reid International Airport – John Wayne Orange County International Airport | 365 | 13.1 min | 78.3% | 46 |
| SJC SNA Mineta San Jose International Airport – John Wayne Orange County International Airport | 550 | -3.1 min | 95.1% | 42 |
| FLL BWI Fort Lauderdale Hollywood International Airport – Baltimore/Washington International Thurgood Marshall Airport | 1,493 | 16.6 min | 83.3% | 36 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 19 | 19 | 89.5% | 0 |
| November 2024 | 16 | 15 | 80.0% | 1 |
| December 2024 | 4 | 4 | 100.0% | 0 |
| January 2025 | 1 | 1 | 0.0% | 0 |
| February 2025 | 2 | 2 | 50.0% | 0 |
| March 2025 | 1 | 1 | 100.0% | 0 |
| April 2025 | 20 | 20 | 60.0% | 0 |
| May 2025 | 27 | 27 | 63.0% | 0 |
| June 2025 | 33 | 33 | 72.7% | 0 |
| July 2025 | 34 | 34 | 70.6% | 0 |
| August 2025 | 32 | 32 | 75.0% | 0 |
| September 2025 | 30 | 30 | 60.0% | 0 |
| October 2025 | 1 | 1 | 100.0% | 0 |
| November 2025 | 53 | 53 | 67.9% | 0 |
| December 2025 | 62 | 61 | 73.8% | 1 |
| January 2026 | 31 | 31 | 67.7% | 0 |
| February 2026 | 25 | 25 | 68.0% | 0 |
| March 2026 | 4 | 4 | 100.0% | 0 |
| April 2026 | 18 | 17 | 94.1% | 1 |
| May 2026 | 21 | 21 | 100.0% | 0 |
| June 2026 | 30 | 30 | 56.7% | 0 |
| July 2026 | 31 | 31 | 71.0% | 0 |