WN323
WN323 (Southwest Airlines) is a multi-stop service on 32 routes, busiest Denver to Boston. Of 626 departures recorded from October 2024 to July 2026, 76.3% left on time, according to the US BTS.
- On-time departures76.3%of 626 flights
- Average delay12.2 min
- July 202639▲ 30.0%vs July 2025
- Cancelled1.1%
- Legs flown under this number32
according to the US BTS · Oct 12, 2024 → Jul 31, 2026 domestic flights only
Recorded departures by month
Partial coverage: domestic flights only · 22 of 22 periods have data
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 | 28 | 27 | ▼ 3.6% |
| February | 26 | 27 | ▲ 3.8% |
| March | 19 | 19 | 0.0% |
| April | 27 | 27 | 0.0% |
| May | 31 | 31 | 0.0% |
| June | 30 | 42 | ▲ 40.0% |
| July | 30 | 39 | ▲ 30.0% |
| August | 20 | – | – |
| September | 17 | – | – |
| October | 31 | – | in progress |
| November | 30 | – | – |
| December | 31 | – | – |
| Year to date (Jan–Jul) | 191 | 212 | ▲ 11.0% |
according to the US BTS · October 2024 → July 2026
On-time departures by month
Partial coverage: domestic flights only · 22 of 22 periods have data
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 | 84.6% | 92.3% | ▲ 9.1% |
| February | 88.5% | 61.5% | ▼ 30.4% |
| March | 79.0% | 63.2% | ▼ 20.0% |
| April | 88.9% | 88.9% | 0.0% |
| May | 73.3% | 87.1% | ▲ 18.8% |
| June | 60.0% | 63.4% | ▲ 5.7% |
| July | 36.7% | 56.4% | ▲ 53.8% |
| August | 85.0% | – | – |
| September | 88.2% | – | – |
| October | 83.9% | – | in progress |
| November | 73.3% | – | – |
| December | 80.0% | – | – |
| Year-to-date average (Jan–Jul) | 73.0% | 73.3% | ▲ 0.4% |
according to the US BTS · October 2024 → July 2026
Average departure delay by month
Partial coverage: domestic flights only · 22 of 22 periods have data
according to the US BTS · October 2024 → July 2026
Cancelled departures by month
Partial coverage: domestic flights only · 22 of 22 periods have data
The most recent periods19 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 2 | 1 | ▼ 50.0% |
| February | 0 | 1 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 1 | 0 | ▼ 100.0% |
| June | 0 | 1 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 1 | – | – |
| Year to date (Jan–Jul) | 3 | 3 | 0.0% |
according to the US BTS · October 2024 → July 2026
This is not a forecast
This is a historical record of departures already flown, not a forecast for your flight.
This number flies several legs
Several legs: the headline figure averages all of them. See the leg table.
Cancellation share
- Not cancelled 98.9% 619
- Cancelled 1.1% 7
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
99 of 9
| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| DEN BOS Denver International Airport – Boston Logan International Airport | 2,816 | 13.6 min | 77.8% | 64 |
| BNA FLL Nashville International Airport – Fort Lauderdale Hollywood International Airport | 1,278 | 37.2 min | 45.0% | 60 |
| BNA SMF Nashville International Airport – Sacramento International Airport | 3,078 | 8.0 min | 80.7% | 58 |
| BNA LGA Nashville International Airport – LaGuardia Airport | 1,228 | 2.9 min | 89.7% | 58 |
| AUS LAS Austin Bergstrom International Airport – Harry Reid International Airport | 1,752 | 17.4 min | 58.9% | 57 |
| STL HOU St. Louis Lambert International Airport – William P. Hobby Airport | 1,108 | 14.6 min | 80.0% | 36 |
| SJC BUR Mineta San Jose International Airport – Hollywood Burbank/Bob Hope Airport | 477 | 8.4 min | 83.3% | 36 |
| SJC PHX Mineta San Jose International Airport – Phoenix Sky Harbor International Airport | 999 | 7.3 min | 90.6% | 32 |
| PHX SLC Phoenix Sky Harbor International Airport – Salt Lake City International Airport | 818 | 4.2 min | 83.9% | 31 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 36 | 36 | 94.4% | 0 |
| November 2024 | 29 | 29 | 93.1% | 0 |
| December 2024 | 29 | 29 | 72.4% | 0 |
| January 2025 | 28 | 26 | 84.6% | 2 |
| February 2025 | 26 | 26 | 88.5% | 0 |
| March 2025 | 19 | 19 | 79.0% | 0 |
| April 2025 | 27 | 27 | 88.9% | 0 |
| May 2025 | 31 | 30 | 73.3% | 1 |
| June 2025 | 30 | 30 | 60.0% | 0 |
| July 2025 | 30 | 30 | 36.7% | 0 |
| August 2025 | 20 | 20 | 85.0% | 0 |
| September 2025 | 17 | 17 | 88.2% | 0 |
| October 2025 | 31 | 31 | 83.9% | 0 |
| November 2025 | 30 | 30 | 73.3% | 0 |
| December 2025 | 31 | 30 | 80.0% | 1 |
| January 2026 | 27 | 26 | 92.3% | 1 |
| February 2026 | 27 | 26 | 61.5% | 1 |
| March 2026 | 19 | 19 | 63.2% | 0 |
| April 2026 | 27 | 27 | 88.9% | 0 |
| May 2026 | 31 | 31 | 87.1% | 0 |
| June 2026 | 42 | 41 | 63.4% | 1 |
| July 2026 | 39 | 39 | 56.4% | 0 |