WN540
WN540 (Southwest Airlines) is a multi-stop service on 33 routes, busiest Denver to Seattle. Of 781 departures recorded from October 2024 to July 2026, 67.1% left on time, according to the US BTS.
- On-time departures67.1%of 781 flights
- Average delay18.0 min
- July 202653▲ 10.4%vs July 2025
- Cancelled0.6%
- Legs flown under this number33
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 | 29 | ▼ 12.1% |
| February | 28 | 27 | ▼ 3.6% |
| March | 43 | 31 | ▼ 27.9% |
| April | 25 | 30 | ▲ 20.0% |
| May | 16 | 31 | ▲ 93.8% |
| June | 45 | 50 | ▲ 11.1% |
| July | 48 | 53 | ▲ 10.4% |
| August | 56 | – | – |
| September | 57 | – | – |
| October | 20 | – | in progress |
| November | 32 | – | – |
| December | 40 | – | – |
| Year to date (Jan–Jul) | 238 | 251 | ▲ 5.5% |
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 | 57.6% | 96.4% | ▲ 67.5% |
| February | 63.0% | 59.3% | ▼ 5.9% |
| March | 71.4% | 48.4% | ▼ 32.3% |
| April | 80.0% | 56.7% | ▼ 29.2% |
| May | 93.8% | 58.1% | ▼ 38.1% |
| June | 64.4% | 40.0% | ▼ 37.9% |
| July | 60.4% | 26.4% | ▼ 56.3% |
| August | 73.2% | – | – |
| September | 80.7% | – | – |
| October | 90.0% | – | in progress |
| November | 96.8% | – | – |
| December | 80.0% | – | – |
| Year-to-date average (Jan–Jul) | 70.1% | 55.0% | ▼ 21.5% |
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 | 1 | – |
| February | 1 | 0 | ▼ 100.0% |
| March | 1 | 0 | ▼ 100.0% |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 1 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 2 | 1 | ▼ 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 99.4% 776
- Cancelled 0.6% 5
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 | 20 | 20 | 90.0% | 0 |
| November 2024 | 30 | 29 | 93.1% | 1 |
| December 2024 | 37 | 37 | 62.2% | 0 |
| January 2025 | 33 | 33 | 57.6% | 0 |
| February 2025 | 28 | 27 | 63.0% | 1 |
| March 2025 | 43 | 42 | 71.4% | 1 |
| April 2025 | 25 | 25 | 80.0% | 0 |
| May 2025 | 16 | 16 | 93.8% | 0 |
| June 2025 | 45 | 45 | 64.4% | 0 |
| July 2025 | 48 | 48 | 60.4% | 0 |
| August 2025 | 56 | 56 | 73.2% | 0 |
| September 2025 | 57 | 57 | 80.7% | 0 |
| October 2025 | 20 | 20 | 90.0% | 0 |
| November 2025 | 32 | 31 | 96.8% | 1 |
| December 2025 | 40 | 40 | 80.0% | 0 |
| January 2026 | 29 | 28 | 96.4% | 1 |
| February 2026 | 27 | 27 | 59.3% | 0 |
| March 2026 | 31 | 31 | 48.4% | 0 |
| April 2026 | 30 | 30 | 56.7% | 0 |
| May 2026 | 31 | 31 | 58.1% | 0 |
| June 2026 | 50 | 50 | 40.0% | 0 |
| July 2026 | 53 | 53 | 26.4% | 0 |