WN4978
WN4978 (Southwest Airlines) is a multi-stop service on 6 routes, busiest Milwaukee to Phoenix. Of 128 departures recorded from November 2025 to July 2026, 84.3% left on time, according to the US BTS.
- On-time departures84.3%of 128 flights
- Average delay7.6 min
- July 202627
- Cancelled0.8%
- Legs flown under this number6
Recorded departures by month
Short series — WN4978 has only 6 months so far. Enough to show the level now, not enough to read a trend.
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods6 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | – | 31 | – |
| February | – | 43 | – |
| March | – | 7 | – |
| April | – | – | – |
| May | – | – | – |
| June | – | 19 | – |
| July | – | 27 | – |
| August | – | – | – |
| September | – | – | – |
| October | – | – | in progress |
| November | 1 | – | – |
| December | – | – | – |
according to the US BTS · November 2025 → July 2026
On-time departures by month
Short series — WN4978 has only 6 months so far. Enough to show the level now, not enough to read a trend.
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 periods6 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | – | 96.8% | – |
| February | – | 92.9% | – |
| March | – | 100.0% | – |
| April | – | – | – |
| May | – | – | – |
| June | – | 68.4% | – |
| July | – | 66.7% | – |
| August | – | – | – |
| September | – | – | – |
| October | – | – | in progress |
| November | 0.0% | – | – |
| December | – | – | – |
according to the US BTS · November 2025 → July 2026
Average departure delay by month
Short series — WN4978 has only 6 months so far. Enough to show the level now, not enough to read a trend.
Months without data are left blank.
according to the US BTS · November 2025 → July 2026
Cancelled departures by month
Short series — WN4978 has only 6 months so far. Enough to show the level now, not enough to read a trend.
Months without data are left blank.
The most recent periods6 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | – | 0 | – |
| February | – | 1 | – |
| March | – | 0 | – |
| April | – | – | – |
| May | – | – | – |
| June | – | 0 | – |
| July | – | 0 | – |
| August | – | – | – |
| September | – | – | – |
| October | – | – | in progress |
| November | 0 | – | – |
| December | – | – | – |
according to the US BTS · November 2025 → 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 99.2% 127
- Cancelled 0.8% 1
Share of all recorded flights in the period, all legs. · Nov 30, 2025 → Jul 31, 2026
On time, leg by leg
Departures within 15 minutes of schedule; small figure = departures recorded.
Legs flown under this number
2| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| MKE PHX General Mitchell International Airport – Phoenix Sky Harbor International Airport | 2,346 | -0.2 min | 100.0% | 55 |
| OAK LAX Oakland San Francisco Bay Airport – Los Angeles International Airport | 543 | 14.4 min | 73.8% | 42 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| November 2025 | 1 | 1 | 0.0% | 0 |
| January 2026 | 31 | 31 | 96.8% | 0 |
| February 2026 | 43 | 42 | 92.9% | 1 |
| March 2026 | 7 | 7 | 100.0% | 0 |
| June 2026 | 19 | 19 | 68.4% | 0 |
| July 2026 | 27 | 27 | 66.7% | 0 |