WN664
WN664 (Southwest Airlines) is a multi-stop service on 25 routes, busiest Milwaukee to Denver. Of 614 departures recorded from October 2024 to July 2026, 84.6% left on time, according to the US BTS.
- On-time departures84.6%of 614 flights
- Average delay5.7 min
- July 202631▲ 40.9%vs July 2025
- Cancelled0.3%
- Legs flown under this number25
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 | 31 | 31 | 0.0% |
| February | 28 | 28 | 0.0% |
| March | 31 | 31 | 0.0% |
| April | 30 | 20 | ▼ 33.3% |
| May | 30 | 17 | ▼ 43.3% |
| June | 22 | 29 | ▲ 31.8% |
| July | 22 | 31 | ▲ 40.9% |
| August | 26 | – | – |
| September | 25 | – | – |
| October | 39 | – | in progress |
| November | 31 | – | – |
| December | 31 | – | – |
| Year to date (Jan–Jul) | 194 | 187 | ▼ 3.6% |
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 | 96.8% | 83.9% | ▼ 13.3% |
| February | 92.9% | 100.0% | ▲ 7.7% |
| March | 100.0% | 46.7% | ▼ 53.3% |
| April | 86.7% | 70.0% | ▼ 19.2% |
| May | 80.0% | 94.1% | ▲ 17.7% |
| June | 81.8% | 100.0% | ▲ 22.2% |
| July | 95.5% | 90.3% | ▼ 5.4% |
| August | 57.7% | – | – |
| September | 56.0% | – | – |
| October | 82.1% | – | in progress |
| November | 86.7% | – | – |
| December | 83.9% | – | – |
| Year-to-date average (Jan–Jul) | 90.5% | 83.6% | ▼ 7.7% |
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 | 0 | 0 | – |
| February | 0 | 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 | 1 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 0 | 1 |
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 99.7% 612
- Cancelled 0.3% 2
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
10Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 95.0% | 0 |
| November 2024 | 30 | 30 | 93.3% | 0 |
| December 2024 | 31 | 31 | 87.1% | 0 |
| January 2025 | 31 | 31 | 96.8% | 0 |
| February 2025 | 28 | 28 | 92.9% | 0 |
| March 2025 | 31 | 31 | 100.0% | 0 |
| April 2025 | 30 | 30 | 86.7% | 0 |
| May 2025 | 30 | 30 | 80.0% | 0 |
| June 2025 | 22 | 22 | 81.8% | 0 |
| July 2025 | 22 | 22 | 95.5% | 0 |
| August 2025 | 26 | 26 | 57.7% | 0 |
| September 2025 | 25 | 25 | 56.0% | 0 |
| October 2025 | 39 | 39 | 82.1% | 0 |
| November 2025 | 31 | 30 | 86.7% | 1 |
| December 2025 | 31 | 31 | 83.9% | 0 |
| January 2026 | 31 | 31 | 83.9% | 0 |
| February 2026 | 28 | 28 | 100.0% | 0 |
| March 2026 | 31 | 30 | 46.7% | 1 |
| April 2026 | 20 | 20 | 70.0% | 0 |
| May 2026 | 17 | 17 | 94.1% | 0 |
| June 2026 | 29 | 29 | 100.0% | 0 |
| July 2026 | 31 | 31 | 90.3% | 0 |