WN556
WN556 (Southwest Airlines) is a multi-stop service on 48 routes, busiest Atlanta to Phoenix. Of 862 departures recorded from October 2024 to July 2026, 72.9% left on time, according to the US BTS.
- On-time departures72.9%of 862 flights
- Average delay14.2 min
- July 202654▼ 28.0%vs July 2025
- Cancelled1.6%
- Legs flown under this number48
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 | 36 | 36 | 0.0% |
| February | 35 | 40 | ▲ 14.3% |
| March | 28 | 33 | ▲ 17.9% |
| April | 29 | 38 | ▲ 31.0% |
| May | 31 | 39 | ▲ 25.8% |
| June | 66 | 52 | ▼ 21.2% |
| July | 75 | 54 | ▼ 28.0% |
| August | 42 | – | – |
| September | 39 | – | – |
| October | 48 | – | in progress |
| November | 31 | – | – |
| December | 31 | – | – |
| Year to date (Jan–Jul) | 300 | 292 | ▼ 2.7% |
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 | 71.4% | 78.8% | ▲ 10.3% |
| February | 77.1% | 79.5% | ▲ 3.0% |
| March | 66.7% | 96.8% | ▲ 45.1% |
| April | 75.9% | 63.2% | ▼ 16.7% |
| May | 71.0% | 74.4% | ▲ 4.8% |
| June | 81.8% | 41.2% | ▼ 49.7% |
| July | 61.3% | 50.0% | ▼ 18.5% |
| August | 71.4% | – | – |
| September | 97.4% | – | – |
| October | 68.8% | – | in progress |
| November | 75.0% | – | – |
| December | 77.4% | – | – |
| Year-to-date average (Jan–Jul) | 72.2% | 69.1% | ▼ 4.2% |
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 | 1 | 3 | ▲ 200.0% |
| February | 0 | 1 | – |
| March | 1 | 2 | ▲ 100.0% |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 1 | – |
| July | 0 | 2 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 3 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 2 | 9 | ▲ 350.0% |
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 98.4% 848
- Cancelled 1.6% 14
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
9Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 90.0% | 0 |
| November 2024 | 28 | 28 | 96.4% | 0 |
| December 2024 | 31 | 31 | 83.9% | 0 |
| January 2025 | 36 | 35 | 71.4% | 1 |
| February 2025 | 35 | 35 | 77.1% | 0 |
| March 2025 | 28 | 27 | 66.7% | 1 |
| April 2025 | 29 | 29 | 75.9% | 0 |
| May 2025 | 31 | 31 | 71.0% | 0 |
| June 2025 | 66 | 66 | 81.8% | 0 |
| July 2025 | 75 | 75 | 61.3% | 0 |
| August 2025 | 42 | 42 | 71.4% | 0 |
| September 2025 | 39 | 39 | 97.4% | 0 |
| October 2025 | 48 | 48 | 68.8% | 0 |
| November 2025 | 31 | 28 | 75.0% | 3 |
| December 2025 | 31 | 31 | 77.4% | 0 |
| January 2026 | 36 | 33 | 78.8% | 3 |
| February 2026 | 40 | 39 | 79.5% | 1 |
| March 2026 | 33 | 31 | 96.8% | 2 |
| April 2026 | 38 | 38 | 63.2% | 0 |
| May 2026 | 39 | 39 | 74.4% | 0 |
| June 2026 | 52 | 51 | 41.2% | 1 |
| July 2026 | 54 | 52 | 50.0% | 2 |