WN543
WN543 (Southwest Airlines) is a multi-stop service on 42 routes, busiest Austin to Denver. Of 803 departures recorded from October 2024 to July 2026, 72.8% left on time, according to the US BTS.
- On-time departures72.8%of 803 flights
- Average delay16.6 min
- July 202633▼ 49.2%vs July 2025
- Cancelled1.1%
- Legs flown under this number42
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 | 33 | 31 | ▼ 6.1% |
| February | 28 | 28 | 0.0% |
| March | 35 | 31 | ▼ 11.4% |
| April | 31 | 45 | ▲ 45.2% |
| May | 31 | 49 | ▲ 58.1% |
| June | 62 | 33 | ▼ 46.8% |
| July | 65 | 33 | ▼ 49.2% |
| August | 46 | – | – |
| September | 42 | – | – |
| October | 26 | – | in progress |
| November | 30 | – | – |
| December | 31 | – | – |
| Year to date (Jan–Jul) | 285 | 250 | ▼ 12.3% |
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 | 87.5% | 77.4% | ▼ 11.5% |
| February | 85.2% | 71.4% | ▼ 16.2% |
| March | 91.2% | 50.0% | ▼ 45.2% |
| April | 58.1% | 84.4% | ▲ 45.4% |
| May | 61.3% | 75.5% | ▲ 23.2% |
| June | 56.5% | 78.8% | ▲ 39.6% |
| July | 58.3% | 84.9% | ▲ 45.5% |
| August | 91.3% | – | – |
| September | 88.1% | – | – |
| October | 88.5% | – | in progress |
| November | 43.3% | – | – |
| December | 38.7% | – | – |
| Year-to-date average (Jan–Jul) | 71.1% | 74.6% | ▲ 4.9% |
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 | 1 | 0 | ▼ 100.0% |
| March | 1 | 1 | 0.0% |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 5 | 0 | ▼ 100.0% |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 8 | 1 | ▼ 87.5% |
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 98.9% 794
- Cancelled 1.1% 9
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
10Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 21 | 21 | 81.0% | 0 |
| November 2024 | 33 | 33 | 90.9% | 0 |
| December 2024 | 39 | 39 | 69.2% | 0 |
| January 2025 | 33 | 32 | 87.5% | 1 |
| February 2025 | 28 | 27 | 85.2% | 1 |
| March 2025 | 35 | 34 | 91.2% | 1 |
| April 2025 | 31 | 31 | 58.1% | 0 |
| May 2025 | 31 | 31 | 61.3% | 0 |
| June 2025 | 62 | 62 | 56.5% | 0 |
| July 2025 | 65 | 60 | 58.3% | 5 |
| August 2025 | 46 | 46 | 91.3% | 0 |
| September 2025 | 42 | 42 | 88.1% | 0 |
| October 2025 | 26 | 26 | 88.5% | 0 |
| November 2025 | 30 | 30 | 43.3% | 0 |
| December 2025 | 31 | 31 | 38.7% | 0 |
| January 2026 | 31 | 31 | 77.4% | 0 |
| February 2026 | 28 | 28 | 71.4% | 0 |
| March 2026 | 31 | 30 | 50.0% | 1 |
| April 2026 | 45 | 45 | 84.4% | 0 |
| May 2026 | 49 | 49 | 75.5% | 0 |
| June 2026 | 33 | 33 | 78.8% | 0 |
| July 2026 | 33 | 33 | 84.9% | 0 |