WN3666
WN3666 (Southwest Airlines) is a multi-stop service on 19 routes, busiest Milwaukee to Denver. Of 344 departures recorded from October 2024 to July 2026, 78.4% left on time, according to the US BTS.
- On-time departures78.4%of 344 flights
- Average delay11.1 min
- July 202618▼ 33.3%vs July 2025
- Cancelled0.6%
- Legs flown under this number19
Recorded departures by month
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods17 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 3 | 6 | ▲ 100.0% |
| February | – | 1 | – |
| March | 30 | 39 | ▲ 30.0% |
| April | 8 | 15 | ▲ 87.5% |
| May | – | 12 | – |
| June | 22 | 16 | ▼ 27.3% |
| July | 27 | 18 | ▼ 33.3% |
| August | 26 | – | – |
| September | 26 | – | – |
| October | 6 | – | in progress |
| November | 24 | – | – |
| December | 20 | – | – |
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 periods17 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 66.7% | 80.0% | ▲ 20.0% |
| February | – | 100.0% | – |
| March | 86.7% | 84.2% | ▼ 2.8% |
| April | 50.0% | 100.0% | ▲ 100.0% |
| May | – | 83.3% | – |
| June | 81.8% | 37.5% | ▼ 54.2% |
| July | 63.0% | 88.9% | ▲ 41.2% |
| August | 61.5% | – | – |
| September | 96.2% | – | – |
| October | 66.7% | – | in progress |
| November | 66.7% | – | – |
| December | 85.0% | – | – |
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 periods17 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 1 | – |
| February | – | 0 | – |
| March | 0 | 1 | – |
| April | 0 | 0 | – |
| May | – | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| 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 99.4% 342
- Cancelled 0.6% 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
5| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| MKE DEN General Mitchell International Airport – Denver International Airport | 1,438 | 16.9 min | 69.2% | 52 |
| MDW CLE Chicago Midway International Airport – Cleveland Hopkins International Airport | 493 | 9.3 min | 82.0% | 50 |
| MCO STL Orlando International Airport – St. Louis Lambert International Airport | 1,420 | 11.4 min | 76.1% | 46 |
| SJC DEN Mineta San Jose International Airport – Denver International Airport | 1,522 | 16.9 min | 64.7% | 34 |
| VPS BNA Destin-Fort Walton Beach Airport – Nashville International Airport | 628 | 16.2 min | 81.8% | 33 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 29 | 29 | 96.6% | 0 |
| November 2024 | 6 | 6 | 100.0% | 0 |
| December 2024 | 10 | 10 | 50.0% | 0 |
| January 2025 | 3 | 3 | 66.7% | 0 |
| March 2025 | 30 | 30 | 86.7% | 0 |
| April 2025 | 8 | 8 | 50.0% | 0 |
| June 2025 | 22 | 22 | 81.8% | 0 |
| July 2025 | 27 | 27 | 63.0% | 0 |
| August 2025 | 26 | 26 | 61.5% | 0 |
| September 2025 | 26 | 26 | 96.2% | 0 |
| October 2025 | 6 | 6 | 66.7% | 0 |
| November 2025 | 24 | 24 | 66.7% | 0 |
| December 2025 | 20 | 20 | 85.0% | 0 |
| January 2026 | 6 | 5 | 80.0% | 1 |
| February 2026 | 1 | 1 | 100.0% | 0 |
| March 2026 | 39 | 38 | 84.2% | 1 |
| April 2026 | 15 | 15 | 100.0% | 0 |
| May 2026 | 12 | 12 | 83.3% | 0 |
| June 2026 | 16 | 16 | 37.5% | 0 |
| July 2026 | 18 | 18 | 88.9% | 0 |