WN1591
WN1591 (Southwest Airlines) is a multi-stop service on 27 routes, busiest St Louis to New York. Of 653 departures recorded from October 2024 to July 2026, 80.4% left on time, according to the US BTS.
- On-time departures80.4%of 653 flights
- Average delay9.4 min
- July 202617▼ 45.2%vs July 2025
- Cancelled3.1%
- Legs flown under this number27
according to the US BTS · Oct 12, 2024 → Jul 29, 2026 domestic flights only
Recorded departures by month
Partial coverage: domestic flights only · 22 of 22 periods have data
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 | 34 | 31 | ▼ 8.8% |
| February | 30 | 31 | ▲ 3.3% |
| March | 37 | 31 | ▼ 16.2% |
| April | 40 | 30 | ▼ 25.0% |
| May | 39 | 31 | ▼ 20.5% |
| June | 32 | 18 | ▼ 43.8% |
| July | 31 | 17 | ▼ 45.2% |
| August | 27 | – | – |
| September | 26 | – | – |
| October | 31 | – | in progress |
| November | 28 | – | – |
| December | 29 | – | – |
| Year to date (Jan–Jul) | 243 | 189 | ▼ 22.2% |
according to the US BTS · October 2024 → July 2026
On-time departures by month
Partial coverage: domestic flights only · 22 of 22 periods have data
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 | 87.9% | 77.4% | ▼ 11.9% |
| February | 86.2% | 80.7% | ▼ 6.4% |
| March | 81.1% | 76.7% | ▼ 5.4% |
| April | 90.0% | 66.7% | ▼ 25.9% |
| May | 100.0% | 54.8% | ▼ 45.2% |
| June | 81.3% | 72.2% | ▼ 11.1% |
| July | 86.7% | 76.5% | ▼ 11.8% |
| August | 84.6% | – | – |
| September | 76.9% | – | – |
| October | 77.4% | – | in progress |
| November | 71.4% | – | – |
| December | 65.5% | – | – |
| Year-to-date average (Jan–Jul) | 87.6% | 72.1% | ▼ 17.6% |
according to the US BTS · October 2024 → July 2026
Average departure delay by month
Partial coverage: domestic flights only · 22 of 22 periods have data
according to the US BTS · October 2024 → July 2026
Cancelled departures by month
Partial coverage: domestic flights only · 22 of 22 periods have data
The most recent periods19 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 1 | 0 | ▼ 100.0% |
| February | 1 | 0 | ▼ 100.0% |
| March | 0 | 1 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 1 | 0 | ▼ 100.0% |
| August | 1 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 3 | 1 | ▼ 66.7% |
according to the US BTS · October 2024 → July 2026
This is not a forecast
This is a historical record of departures already flown, not a forecast for your flight.
This number flies several legs
Several legs: the headline figure averages all of them. See the leg table.
Cancellation share
- Not cancelled 96.9% 633
- Cancelled 3.1% 20
Share of all recorded flights in the period, all legs. · Oct 12, 2024 → Jul 29, 2026
On time, leg by leg
Departures within 15 minutes of schedule; small figure = departures recorded.
Legs flown under this number
88 of 8
| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| STL LGA St. Louis Lambert International Airport – LaGuardia Airport | 1,426 | 12.4 min | 86.6% | 121 |
| BWI BNA Baltimore/Washington International Thurgood Marshall Airport – Nashville International Airport | 944 | 8.5 min | 81.7% | 61 |
| BOI PHX Boise Air Terminal/Gowen Field – Phoenix Sky Harbor International Airport | 1,184 | 22.3 min | 56.9% | 58 |
| MCI STL Kansas City International Airport – St. Louis Lambert International Airport | 380 | 0.5 min | 98.3% | 58 |
| STL CLE St. Louis Lambert International Airport – Cleveland Hopkins International Airport | 783 | 0.4 min | 84.9% | 53 |
| BUR SMF Hollywood Burbank/Bob Hope Airport – Sacramento International Airport | 577 | 5.6 min | 81.6% | 50 |
| BWI BDL Baltimore/Washington International Thurgood Marshall Airport – Bradley International Airport | 455 | 9.0 min | 80.5% | 41 |
| BUR SJC Hollywood Burbank/Bob Hope Airport – Mineta San Jose International Airport | 477 | 5.8 min | 77.4% | 31 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 7 | 100.0% | 13 |
| November 2024 | 29 | 27 | 92.6% | 2 |
| December 2024 | 31 | 31 | 83.9% | 0 |
| January 2025 | 34 | 33 | 87.9% | 1 |
| February 2025 | 30 | 29 | 86.2% | 1 |
| March 2025 | 37 | 37 | 81.1% | 0 |
| April 2025 | 40 | 40 | 90.0% | 0 |
| May 2025 | 39 | 39 | 100.0% | 0 |
| June 2025 | 32 | 32 | 81.3% | 0 |
| July 2025 | 31 | 30 | 86.7% | 1 |
| August 2025 | 27 | 26 | 84.6% | 1 |
| September 2025 | 26 | 26 | 76.9% | 0 |
| October 2025 | 31 | 31 | 77.4% | 0 |
| November 2025 | 28 | 28 | 71.4% | 0 |
| December 2025 | 29 | 29 | 65.5% | 0 |
| January 2026 | 31 | 31 | 77.4% | 0 |
| February 2026 | 31 | 31 | 80.7% | 0 |
| March 2026 | 31 | 30 | 76.7% | 1 |
| April 2026 | 30 | 30 | 66.7% | 0 |
| May 2026 | 31 | 31 | 54.8% | 0 |
| June 2026 | 18 | 18 | 72.2% | 0 |
| July 2026 | 17 | 17 | 76.5% | 0 |