WN4121
WN4121 (Southwest Airlines) is a multi-stop service on 23 routes, busiest Phoenix to Sacramento. Of 470 departures recorded from October 2024 to July 2026, 69.3% left on time, according to the US BTS.
- On-time departures69.3%of 470 flights
- Average delay17.8 min
- July 202630▲ 650.0%vs July 2025
- Cancelled1.1%
- Legs flown under this number23
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 | 20 | 11 | ▼ 45.0% |
| February | 19 | 25 | ▲ 31.6% |
| March | 26 | 24 | ▼ 7.7% |
| April | 26 | 5 | ▼ 80.8% |
| May | 27 | – | – |
| June | 7 | 27 | ▲ 285.7% |
| July | 4 | 30 | ▲ 650.0% |
| August | 28 | – | – |
| September | 30 | – | – |
| October | 31 | – | in progress |
| November | 29 | – | – |
| December | 33 | – | – |
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 | 90.0% | 50.0% | ▼ 44.4% |
| February | 84.2% | 36.0% | ▼ 57.2% |
| March | 73.1% | 75.0% | ▲ 2.6% |
| April | 84.6% | 80.0% | ▼ 5.5% |
| May | 55.6% | – | – |
| June | 71.4% | 37.0% | ▼ 48.1% |
| July | 50.0% | 25.0% | ▼ 50.0% |
| August | 96.4% | – | – |
| September | 96.7% | – | – |
| October | 67.7% | – | in progress |
| November | 58.6% | – | – |
| December | 57.6% | – | – |
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 | 1 | – |
| February | 0 | 0 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | – | – |
| June | 0 | 0 | – |
| July | 0 | 2 | – |
| 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 98.9% 465
- Cancelled 1.1% 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
6| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| PHX SMF Phoenix Sky Harbor International Airport – Sacramento International Airport | 1,040 | 6.4 min | 86.9% | 61 |
| PHX SAT Phoenix Sky Harbor International Airport – San Antonio International Airport | 1,354 | 26.8 min | 61.7% | 60 |
| DTW MDW Detroit Metropolitan Wayne County Airport – Chicago Midway International Airport | 367 | 4.6 min | 98.3% | 58 |
| MDW SMF Chicago Midway International Airport – Sacramento International Airport | 2,874 | 43.8 min | 30.9% | 57 |
| LAS MSP Harry Reid International Airport – Minneapolis–Saint Paul International Airport / Wold–Chamberlain Field | 2,088 | 18.8 min | 66.0% | 50 |
| PDX DEN Portland International Airport – Denver International Airport | 1,592 | 16.5 min | 67.7% | 31 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 18 | 100.0% | 2 |
| November 2024 | 27 | 27 | 81.5% | 0 |
| December 2024 | 21 | 21 | 90.5% | 0 |
| January 2025 | 20 | 20 | 90.0% | 0 |
| February 2025 | 19 | 19 | 84.2% | 0 |
| March 2025 | 26 | 26 | 73.1% | 0 |
| April 2025 | 26 | 26 | 84.6% | 0 |
| May 2025 | 27 | 27 | 55.6% | 0 |
| June 2025 | 7 | 7 | 71.4% | 0 |
| July 2025 | 4 | 4 | 50.0% | 0 |
| August 2025 | 28 | 28 | 96.4% | 0 |
| September 2025 | 30 | 30 | 96.7% | 0 |
| October 2025 | 31 | 31 | 67.7% | 0 |
| November 2025 | 29 | 29 | 58.6% | 0 |
| December 2025 | 33 | 33 | 57.6% | 0 |
| January 2026 | 11 | 10 | 50.0% | 1 |
| February 2026 | 25 | 25 | 36.0% | 0 |
| March 2026 | 24 | 24 | 75.0% | 0 |
| April 2026 | 5 | 5 | 80.0% | 0 |
| June 2026 | 27 | 27 | 37.0% | 0 |
| July 2026 | 30 | 28 | 25.0% | 2 |