WN557
WN557 (Southwest Airlines) is a multi-stop service on 43 routes, busiest Denver to Chicago. Of 815 departures recorded from October 2024 to July 2026, 72.2% left on time, according to the US BTS.
- On-time departures72.2%of 815 flights
- Average delay14.2 min
- July 202614▼ 78.5%vs July 2025
- Cancelled1.0%
- Legs flown under this number43
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 | 48 | 30 | ▼ 37.5% |
| February | 37 | 25 | ▼ 32.4% |
| March | 37 | 31 | ▼ 16.2% |
| April | 48 | 46 | ▼ 4.2% |
| May | 54 | 52 | ▼ 3.7% |
| June | 63 | 15 | ▼ 76.2% |
| July | 65 | 14 | ▼ 78.5% |
| August | 36 | – | – |
| September | 30 | – | – |
| October | 47 | – | in progress |
| November | 32 | – | – |
| December | 31 | – | – |
| Year to date (Jan–Jul) | 352 | 213 | ▼ 39.5% |
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 | 89.4% | 73.3% | ▼ 17.9% |
| February | 83.8% | 68.0% | ▼ 18.8% |
| March | 94.4% | 86.2% | ▼ 8.7% |
| April | 89.4% | 67.4% | ▼ 24.6% |
| May | 66.0% | 70.6% | ▲ 6.9% |
| June | 55.6% | 40.0% | ▼ 28.0% |
| July | 56.3% | 57.1% | ▲ 1.6% |
| August | 80.6% | – | – |
| September | 86.7% | – | – |
| October | 53.2% | – | in progress |
| November | 62.5% | – | – |
| December | 67.7% | – | – |
| Year-to-date average (Jan–Jul) | 76.4% | 66.1% | ▼ 13.5% |
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 | 1 | 0 | ▼ 100.0% |
| February | 0 | 0 | – |
| March | 1 | 2 | ▲ 100.0% |
| April | 1 | 0 | ▼ 100.0% |
| May | 1 | 1 | 0.0% |
| June | 0 | 0 | – |
| July | 1 | 0 | ▼ 100.0% |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 5 | 3 | ▼ 40.0% |
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% 807
- Cancelled 1.0% 8
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
6| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| DEN ORD Denver International Airport – Chicago O'Hare International Airport | 1,426 | 8.2 min | 85.2% | 81 |
| MDW MSP Chicago Midway International Airport – Minneapolis–Saint Paul International Airport / Wold–Chamberlain Field | 560 | 24.4 min | 56.7% | 60 |
| PVD BWI Rhode Island T. F. Green International Airport – Baltimore/Washington International Thurgood Marshall Airport | 526 | 9.2 min | 81.0% | 58 |
| DEN SNA Denver International Airport – John Wayne Orange County International Airport | 1,360 | 2.7 min | 95.6% | 45 |
| ATL DAL Hartsfield Jackson Atlanta International Airport – Dallas Love Field | 1,158 | 11.4 min | 64.3% | 42 |
| PIT PHX Pittsburgh International Airport – Phoenix Sky Harbor International Airport | 2,912 | 29.2 min | 50.0% | 30 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 14 | 14 | 78.6% | 0 |
| November 2024 | 29 | 29 | 86.2% | 0 |
| December 2024 | 31 | 31 | 83.9% | 0 |
| January 2025 | 48 | 47 | 89.4% | 1 |
| February 2025 | 37 | 37 | 83.8% | 0 |
| March 2025 | 37 | 36 | 94.4% | 1 |
| April 2025 | 48 | 47 | 89.4% | 1 |
| May 2025 | 54 | 53 | 66.0% | 1 |
| June 2025 | 63 | 63 | 55.6% | 0 |
| July 2025 | 65 | 64 | 56.3% | 1 |
| August 2025 | 36 | 36 | 80.6% | 0 |
| September 2025 | 30 | 30 | 86.7% | 0 |
| October 2025 | 47 | 47 | 53.2% | 0 |
| November 2025 | 32 | 32 | 62.5% | 0 |
| December 2025 | 31 | 31 | 67.7% | 0 |
| January 2026 | 30 | 30 | 73.3% | 0 |
| February 2026 | 25 | 25 | 68.0% | 0 |
| March 2026 | 31 | 29 | 86.2% | 2 |
| April 2026 | 46 | 46 | 67.4% | 0 |
| May 2026 | 52 | 51 | 70.6% | 1 |
| June 2026 | 15 | 15 | 40.0% | 0 |
| July 2026 | 14 | 14 | 57.1% | 0 |