WN4180
WN4180 (Southwest Airlines) is a multi-stop service on 21 routes, busiest Nashville to Chicago. Of 474 departures recorded from October 2024 to July 2026, 79.0% left on time, according to the US BTS.
- On-time departures79.0%of 474 flights
- Average delay9.9 min
- July 202617
- Cancelled0.4%
- Legs flown under this number21
Recorded departures by month
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods18 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 27 | 4 | ▼ 85.2% |
| February | 28 | 9 | ▼ 67.9% |
| March | 5 | 4 | ▼ 20.0% |
| April | 31 | 25 | ▼ 19.4% |
| May | 39 | 31 | ▼ 20.5% |
| June | 6 | 15 | ▲ 150.0% |
| July | – | 17 | – |
| August | 46 | – | – |
| September | 52 | – | – |
| October | 15 | – | in progress |
| November | 22 | – | – |
| December | 26 | – | – |
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 periods18 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 92.6% | 75.0% | ▼ 19.0% |
| February | 75.0% | 37.5% | ▼ 50.0% |
| March | 100.0% | 100.0% | 0.0% |
| April | 67.7% | 96.0% | ▲ 41.7% |
| May | 66.7% | 93.6% | ▲ 40.3% |
| June | 66.7% | 100.0% | ▲ 50.0% |
| July | – | 82.4% | – |
| August | 69.6% | – | – |
| September | 66.7% | – | – |
| October | 86.7% | – | in progress |
| November | 90.9% | – | – |
| December | 88.5% | – | – |
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 periods18 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 0 | – |
| February | 0 | 1 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | – | 0 | – |
| August | 0 | – | – |
| September | 1 | – | – |
| 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 99.6% 472
- Cancelled 0.4% 2
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
6| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| BNA ORD Nashville International Airport – Chicago O'Hare International Airport | 660 | 5.3 min | 82.4% | 102 |
| SAV BWI Savannah Hilton Head International Airport – Baltimore/Washington International Thurgood Marshall Airport | 884 | 0.7 min | 94.8% | 58 |
| HOU JAN William P. Hobby Airport – Jackson-Medgar Wiley Evers International Airport | 578 | 22.6 min | 60.3% | 58 |
| SMF SAN Sacramento International Airport – San Diego International Airport | 773 | 17.7 min | 74.0% | 50 |
| RDU MDW Raleigh-Durham International Airport – Chicago Midway International Airport | 1,016 | 3.0 min | 88.1% | 42 |
| SAN AUS San Diego International Airport – Austin Bergstrom International Airport | 1,871 | 30.5 min | 51.6% | 31 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 28 | 28 | 78.6% | 0 |
| November 2024 | 24 | 24 | 83.3% | 0 |
| December 2024 | 20 | 20 | 75.0% | 0 |
| January 2025 | 27 | 27 | 92.6% | 0 |
| February 2025 | 28 | 28 | 75.0% | 0 |
| March 2025 | 5 | 5 | 100.0% | 0 |
| April 2025 | 31 | 31 | 67.7% | 0 |
| May 2025 | 39 | 39 | 66.7% | 0 |
| June 2025 | 6 | 6 | 66.7% | 0 |
| August 2025 | 46 | 46 | 69.6% | 0 |
| September 2025 | 52 | 51 | 66.7% | 1 |
| October 2025 | 15 | 15 | 86.7% | 0 |
| November 2025 | 22 | 22 | 90.9% | 0 |
| December 2025 | 26 | 26 | 88.5% | 0 |
| January 2026 | 4 | 4 | 75.0% | 0 |
| February 2026 | 9 | 8 | 37.5% | 1 |
| March 2026 | 4 | 4 | 100.0% | 0 |
| April 2026 | 25 | 25 | 96.0% | 0 |
| May 2026 | 31 | 31 | 93.6% | 0 |
| June 2026 | 15 | 15 | 100.0% | 0 |
| July 2026 | 17 | 17 | 82.4% | 0 |