WN4939
WN4939 (Southwest Airlines) is a multi-stop service on 7 routes, busiest Chicago to Phoenix. Of 138 departures recorded from October 2024 to July 2026, 83.9% left on time, according to the US BTS.
- On-time departures83.9%of 138 flights
- Average delay7.4 min
- July 202626
- Cancelled0.7%
- Legs flown under this number7
Recorded departures by month
Short series — WN4939 has only 10 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 periods7 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 11 | – | – |
| February | 19 | 1 | ▼ 94.7% |
| March | 3 | – | – |
| April | – | – | – |
| May | – | – | – |
| June | – | 23 | – |
| July | – | 26 | – |
| August | – | – | – |
| September | – | – | – |
| October | – | – | in progress |
| November | 1 | – | – |
| December | – | – | – |
according to the US BTS · October 2024 → July 2026
On-time departures by month
Short series — WN4939 has only 10 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 periods7 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 72.7% | – | – |
| February | 84.2% | 100.0% | ▲ 18.8% |
| March | 100.0% | – | – |
| April | – | – | – |
| May | – | – | – |
| June | – | 91.3% | – |
| July | – | 100.0% | – |
| August | – | – | – |
| September | – | – | – |
| October | – | – | in progress |
| November | 0.0% | – | – |
| December | – | – | – |
according to the US BTS · October 2024 → July 2026
Average departure delay by month
Short series — WN4939 has only 10 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 · October 2024 → July 2026
Cancelled departures by month
Short series — WN4939 has only 10 months so far. Enough to show the level now, not enough to read a trend.
Months without data are left blank.
The most recent periods7 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | – | – |
| February | 0 | 0 | – |
| March | 0 | – | – |
| April | – | – | – |
| May | – | – | – |
| June | – | 0 | – |
| July | – | 1 | – |
| August | – | – | – |
| September | – | – | – |
| October | – | – | in progress |
| November | 0 | – | – |
| December | – | – | – |
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 99.3% 137
- Cancelled 0.7% 1
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
2| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| MDW PHX Chicago Midway International Airport – Phoenix Sky Harbor International Airport | 2,319 | 11.2 min | 80.8% | 73 |
| STL LGA St. Louis Lambert International Airport – LaGuardia Airport | 1,426 | -0.1 min | 95.8% | 49 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 13 | 13 | 69.2% | 0 |
| November 2024 | 23 | 23 | 69.6% | 0 |
| December 2024 | 18 | 18 | 88.9% | 0 |
| January 2025 | 11 | 11 | 72.7% | 0 |
| February 2025 | 19 | 19 | 84.2% | 0 |
| March 2025 | 3 | 3 | 100.0% | 0 |
| November 2025 | 1 | 1 | 0.0% | 0 |
| February 2026 | 1 | 1 | 100.0% | 0 |
| June 2026 | 23 | 23 | 91.3% | 0 |
| July 2026 | 26 | 25 | 100.0% | 1 |