WN577
WN577 (Southwest Airlines) is a multi-stop service on 31 routes, busiest Chicago to Cleveland. Of 605 departures recorded from October 2024 to July 2026, 70.5% left on time, according to the US BTS.
- On-time departures70.5%of 605 flights
- Average delay13.7 min
- July 202627▼ 12.9%vs July 2025
- Cancelled0.3%
- Legs flown under this number31
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 | 10 | ▼ 67.7% |
| February | 28 | 15 | ▼ 46.4% |
| March | 39 | 38 | ▼ 2.6% |
| April | 32 | 22 | ▼ 31.3% |
| May | 30 | 18 | ▼ 40.0% |
| June | 30 | 32 | ▲ 6.7% |
| July | 31 | 27 | ▼ 12.9% |
| August | 28 | – | – |
| September | 26 | – | – |
| October | 27 | – | in progress |
| November | 32 | – | – |
| December | 31 | – | – |
| Year to date (Jan–Jul) | 221 | 162 | ▼ 26.7% |
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 | 71.0% | 100.0% | ▲ 40.9% |
| February | 75.0% | 86.7% | ▲ 15.6% |
| March | 92.3% | 67.6% | ▼ 26.8% |
| April | 87.5% | 72.7% | ▼ 16.9% |
| May | 80.0% | 61.1% | ▼ 23.6% |
| June | 43.3% | 29.0% | ▼ 33.0% |
| July | 41.9% | 66.7% | ▲ 59.0% |
| August | 71.4% | – | – |
| September | 73.1% | – | – |
| October | 55.6% | – | in progress |
| November | 84.4% | – | – |
| December | 90.3% | – | – |
| Year-to-date average (Jan–Jul) | 70.1% | 69.1% | ▼ 1.5% |
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 | 1 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 0 | 2 |
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% 603
- 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
6| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| MDW CLE Chicago Midway International Airport – Cleveland Hopkins International Airport | 493 | 12.6 min | 75.6% | 90 |
| AUS IND Austin Bergstrom International Airport – Indianapolis International Airport | 1,479 | -0.2 min | 87.5% | 64 |
| AUS HOU Austin Bergstrom International Airport – William P. Hobby Airport | 238 | 37.3 min | 39.3% | 61 |
| STL PHX St. Louis Lambert International Airport – Phoenix Sky Harbor International Airport | 2,026 | 5.5 min | 90.5% | 42 |
| MDW MCI Chicago Midway International Airport – Kansas City International Airport | 650 | 0.6 min | 90.9% | 33 |
| SJC SAN Mineta San Jose International Airport – San Diego International Airport | 671 | 14.5 min | 62.5% | 32 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 100.0% | 0 |
| November 2024 | 30 | 30 | 70.0% | 0 |
| December 2024 | 28 | 28 | 57.1% | 0 |
| January 2025 | 31 | 31 | 71.0% | 0 |
| February 2025 | 28 | 28 | 75.0% | 0 |
| March 2025 | 39 | 39 | 92.3% | 0 |
| April 2025 | 32 | 32 | 87.5% | 0 |
| May 2025 | 30 | 30 | 80.0% | 0 |
| June 2025 | 30 | 30 | 43.3% | 0 |
| July 2025 | 31 | 31 | 41.9% | 0 |
| August 2025 | 28 | 28 | 71.4% | 0 |
| September 2025 | 26 | 26 | 73.1% | 0 |
| October 2025 | 27 | 27 | 55.6% | 0 |
| November 2025 | 32 | 32 | 84.4% | 0 |
| December 2025 | 31 | 31 | 90.3% | 0 |
| January 2026 | 10 | 10 | 100.0% | 0 |
| February 2026 | 15 | 15 | 86.7% | 0 |
| March 2026 | 38 | 37 | 67.6% | 1 |
| April 2026 | 22 | 22 | 72.7% | 0 |
| May 2026 | 18 | 18 | 61.1% | 0 |
| June 2026 | 32 | 31 | 29.0% | 1 |
| July 2026 | 27 | 27 | 66.7% | 0 |