WN4453
WN4453 (Southwest Airlines) is a multi-stop service on 15 routes, busiest Denver to Seattle. Of 227 departures recorded from October 2024 to May 2026, 69.3% left on time, according to the US BTS.
- On-time departures69.3%of 227 flights
- Average delay18.1 min
- May 20263▼ 91.7%vs May 2025
- Cancelled0.9%
- Legs flown under this number15
Recorded departures by month
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods14 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | – | 1 | – |
| February | – | 7 | – |
| March | – | 19 | – |
| April | 31 | 4 | ▼ 87.1% |
| May | 36 | 3 | ▼ 91.7% |
| June | 33 | – | – |
| July | 31 | – | – |
| August | 27 | – | – |
| September | 26 | – | – |
| October | 1 | – | in progress |
| November | 4 | – | – |
| December | 2 | – | – |
according to the US BTS · October 2024 → May 2026
On-time departures by month
Months without data are left blank.
On time = departure within 15 minutes of schedule. Non-cancelled flights with a recorded delay only.
The most recent periods14 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | – | 0.0% | – |
| February | – | 71.4% | – |
| March | – | 70.6% | – |
| April | 77.4% | 100.0% | ▲ 29.2% |
| May | 75.0% | 100.0% | ▲ 33.3% |
| June | 54.6% | – | – |
| July | 35.5% | – | – |
| August | 88.9% | – | – |
| September | 92.3% | – | – |
| October | 100.0% | – | in progress |
| November | 75.0% | – | – |
| December | 0.0% | – | – |
according to the US BTS · October 2024 → May 2026
Average departure delay by month
Months without data are left blank.
according to the US BTS · October 2024 → May 2026
Cancelled departures by month
Months without data are left blank.
The most recent periods14 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | – | 0 | – |
| February | – | 0 | – |
| March | – | 2 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | – | – |
| July | 0 | – | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
according to the US BTS · October 2024 → May 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 99.1% 225
- Cancelled 0.9% 2
Share of all recorded flights in the period, all legs. · Oct 31, 2024 → May 31, 2026
On time, leg by leg
Departures within 15 minutes of schedule; small figure = departures recorded.
Legs flown under this number
3| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| DEN SEA Denver International Airport – Seattle–Tacoma International Airport | 1,645 | 56.2 min | 30.8% | 52 |
| DCA MKE Ronald Reagan Washington National Airport – General Mitchell International Airport | 1,019 | -0.3 min | 94.0% | 50 |
| SNA SMF John Wayne Orange County International Airport – Sacramento International Airport | 650 | 7.9 min | 79.6% | 49 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 2 | 2 | 0.0% | 0 |
| April 2025 | 31 | 31 | 77.4% | 0 |
| May 2025 | 36 | 36 | 75.0% | 0 |
| June 2025 | 33 | 33 | 54.6% | 0 |
| July 2025 | 31 | 31 | 35.5% | 0 |
| August 2025 | 27 | 27 | 88.9% | 0 |
| September 2025 | 26 | 26 | 92.3% | 0 |
| October 2025 | 1 | 1 | 100.0% | 0 |
| November 2025 | 4 | 4 | 75.0% | 0 |
| December 2025 | 2 | 2 | 0.0% | 0 |
| January 2026 | 1 | 1 | 0.0% | 0 |
| February 2026 | 7 | 7 | 71.4% | 0 |
| March 2026 | 19 | 17 | 70.6% | 2 |
| April 2026 | 4 | 4 | 100.0% | 0 |
| May 2026 | 3 | 3 | 100.0% | 0 |