WN4155
WN4155 (Southwest Airlines) is a multi-stop service on 26 routes, busiest Chicago to Phoenix. Of 526 departures recorded from October 2024 to July 2026, 64.2% left on time, according to the US BTS.
- On-time departures64.2%of 526 flights
- Average delay17.2 min
- July 202616▼ 70.9%vs July 2025
- Cancelled0.2%
- Legs flown under this number26
Recorded departures by month
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods18 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 15 | 5 | ▼ 66.7% |
| February | 9 | – | – |
| March | 28 | 27 | ▼ 3.6% |
| April | 10 | 41 | ▲ 310.0% |
| May | 3 | 42 | ▲ 1,300.0% |
| June | 51 | 20 | ▼ 60.8% |
| July | 55 | 16 | ▼ 70.9% |
| August | 31 | – | – |
| September | 26 | – | – |
| October | 1 | – | in progress |
| November | 26 | – | – |
| December | 29 | – | – |
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 periods18 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 73.3% | 80.0% | ▲ 9.1% |
| February | 88.9% | – | – |
| March | 50.0% | 100.0% | ▲ 100.0% |
| April | 50.0% | 75.6% | ▲ 51.2% |
| May | 100.0% | 57.1% | ▼ 42.9% |
| June | 47.1% | 40.0% | ▼ 15.0% |
| July | 27.3% | 87.5% | ▲ 220.9% |
| August | 64.5% | – | – |
| September | 73.1% | – | – |
| October | 100.0% | – | in progress |
| November | 61.5% | – | – |
| December | 65.5% | – | – |
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 periods18 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 0 | – |
| February | 0 | – | – |
| March | 0 | 1 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| 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 99.8% 525
- Cancelled 0.2% 1
Share of all recorded flights in the period, all legs. · Oct 13, 2024 → Jul 29, 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 |
|---|---|---|---|---|
| ORD PHX Chicago O'Hare International Airport – Phoenix Sky Harbor International Airport | 2,313 | 28.6 min | 39.3% | 61 |
| PHX TUL Phoenix Sky Harbor International Airport – Tulsa International Airport | 1,501 | 23.5 min | 65.5% | 55 |
| MCO SDF Orlando International Airport – Louisville Muhammad Ali International Airport | 1,158 | 2.4 min | 90.2% | 51 |
| STL DEN St. Louis Lambert International Airport – Denver International Airport | 1,236 | 9.0 min | 76.0% | 50 |
| SAT DEN San Antonio International Airport – Denver International Airport | 1,280 | 16.2 min | 61.9% | 42 |
| ORF BWI Norfolk International Airport – Baltimore/Washington International Thurgood Marshall Airport | 257 | -0.8 min | 100.0% | 33 |
| DEN TPA Denver International Airport – Tampa International Airport | 2,423 | 35.1 min | 45.5% | 33 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 17 | 17 | 82.4% | 0 |
| November 2024 | 33 | 33 | 78.8% | 0 |
| December 2024 | 41 | 41 | 85.4% | 0 |
| January 2025 | 15 | 15 | 73.3% | 0 |
| February 2025 | 9 | 9 | 88.9% | 0 |
| March 2025 | 28 | 28 | 50.0% | 0 |
| April 2025 | 10 | 10 | 50.0% | 0 |
| May 2025 | 3 | 3 | 100.0% | 0 |
| June 2025 | 51 | 51 | 47.1% | 0 |
| July 2025 | 55 | 55 | 27.3% | 0 |
| August 2025 | 31 | 31 | 64.5% | 0 |
| September 2025 | 26 | 26 | 73.1% | 0 |
| October 2025 | 1 | 1 | 100.0% | 0 |
| November 2025 | 26 | 26 | 61.5% | 0 |
| December 2025 | 29 | 29 | 65.5% | 0 |
| January 2026 | 5 | 5 | 80.0% | 0 |
| March 2026 | 27 | 26 | 100.0% | 1 |
| April 2026 | 41 | 41 | 75.6% | 0 |
| May 2026 | 42 | 42 | 57.1% | 0 |
| June 2026 | 20 | 20 | 40.0% | 0 |
| July 2026 | 16 | 16 | 87.5% | 0 |