WN1581
WN1581 (Southwest Airlines) is a multi-stop service on 28 routes, busiest Chicago to Jacksonville. Of 589 departures recorded from October 2024 to July 2026, 74.8% left on time, according to the US BTS.
- On-time departures74.8%of 589 flights
- Average delay12.9 min
- July 202617▼ 45.2%vs July 2025
- Cancelled1.0%
- Legs flown under this number28
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 | 13 | 31 | ▲ 138.5% |
| February | 17 | 28 | ▲ 64.7% |
| March | 37 | 27 | ▼ 27.0% |
| April | 32 | 27 | ▼ 15.6% |
| May | 31 | 31 | 0.0% |
| June | 30 | 18 | ▼ 40.0% |
| July | 31 | 17 | ▼ 45.2% |
| August | 30 | – | – |
| September | 30 | – | – |
| October | 31 | – | in progress |
| November | 27 | – | – |
| December | 29 | – | – |
| Year to date (Jan–Jul) | 191 | 179 | ▼ 6.3% |
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 | 61.5% | 79.3% | ▲ 28.9% |
| February | 100.0% | 67.9% | ▼ 32.1% |
| March | 86.5% | 59.3% | ▼ 31.5% |
| April | 58.6% | 81.5% | ▲ 39.0% |
| May | 56.7% | 87.1% | ▲ 53.7% |
| June | 100.0% | 83.3% | ▼ 16.7% |
| July | 96.8% | 88.2% | ▼ 8.8% |
| August | 53.3% | – | – |
| September | 73.3% | – | – |
| October | 71.0% | – | in progress |
| November | 44.4% | – | – |
| December | 58.6% | – | – |
| Year-to-date average (Jan–Jul) | 80.0% | 78.1% | ▼ 2.4% |
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 | 2 | – |
| February | 0 | 0 | – |
| March | 0 | 0 | – |
| April | 3 | 0 | ▼ 100.0% |
| May | 1 | 0 | ▼ 100.0% |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 4 | 2 | ▼ 50.0% |
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 99.0% 583
- Cancelled 1.0% 6
Share of all recorded flights in the period, all legs. · Oct 15, 2024 → Jul 29, 2026
On time, leg by leg
Departures within 15 minutes of schedule; small figure = departures recorded.
Legs flown under this number
7| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| MDW JAX Chicago Midway International Airport – Jacksonville International Airport | 1,368 | 2.4 min | 89.9% | 69 |
| SJC LGB Mineta San Jose International Airport – Long Beach International Airport | 522 | -2.7 min | 98.4% | 61 |
| PHX HNL Phoenix Sky Harbor International Airport – Daniel K. Inouye International Airport | 4,689 | 2.9 min | 86.2% | 58 |
| LAS DAL Harry Reid International Airport – Dallas Love Field | 1,714 | 21.2 min | 67.3% | 57 |
| DEN GRR Denver International Airport – Gerald R. Ford International Airport | 1,629 | 20.3 min | 59.7% | 57 |
| AUS DEN Austin Bergstrom International Airport – Denver International Airport | 1,249 | 19.7 min | 58.3% | 48 |
| MCO PIT Orlando International Airport – Pittsburgh International Airport | 1,345 | 10.8 min | 73.3% | 47 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 8 | 8 | 100.0% | 0 |
| November 2024 | 27 | 27 | 92.6% | 0 |
| December 2024 | 37 | 37 | 70.3% | 0 |
| January 2025 | 13 | 13 | 61.5% | 0 |
| February 2025 | 17 | 17 | 100.0% | 0 |
| March 2025 | 37 | 37 | 86.5% | 0 |
| April 2025 | 32 | 29 | 58.6% | 3 |
| May 2025 | 31 | 30 | 56.7% | 1 |
| June 2025 | 30 | 30 | 100.0% | 0 |
| July 2025 | 31 | 31 | 96.8% | 0 |
| August 2025 | 30 | 30 | 53.3% | 0 |
| September 2025 | 30 | 30 | 73.3% | 0 |
| October 2025 | 31 | 31 | 71.0% | 0 |
| November 2025 | 27 | 27 | 44.4% | 0 |
| December 2025 | 29 | 29 | 58.6% | 0 |
| January 2026 | 31 | 29 | 79.3% | 2 |
| February 2026 | 28 | 28 | 67.9% | 0 |
| March 2026 | 27 | 27 | 59.3% | 0 |
| April 2026 | 27 | 27 | 81.5% | 0 |
| May 2026 | 31 | 31 | 87.1% | 0 |
| June 2026 | 18 | 18 | 83.3% | 0 |
| July 2026 | 17 | 17 | 88.2% | 0 |