WN645
WN645 (Southwest Airlines) is a multi-stop service on 39 routes, busiest Denver to Philadelphia. Of 719 departures recorded from October 2024 to July 2026, 74.8% left on time, according to the US BTS.
- On-time departures74.8%of 719 flights
- Average delay13.1 min
- July 202628▲ 27.3%vs July 2025
- Cancelled0.6%
- Legs flown under this number39
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 | 31 | 17 | ▼ 45.2% |
| February | 28 | 19 | ▼ 32.1% |
| March | 53 | 17 | ▼ 67.9% |
| April | 61 | 27 | ▼ 55.7% |
| May | 67 | 31 | ▼ 53.7% |
| June | 26 | 26 | 0.0% |
| July | 22 | 28 | ▲ 27.3% |
| August | 38 | – | – |
| September | 39 | – | – |
| October | 32 | – | in progress |
| November | 32 | – | – |
| December | 47 | – | – |
| Year to date (Jan–Jul) | 288 | 165 | ▼ 42.7% |
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 | 71.0% | 82.4% | ▲ 16.0% |
| February | 67.9% | 100.0% | ▲ 47.4% |
| March | 81.1% | 87.5% | ▲ 7.9% |
| April | 85.3% | 51.9% | ▼ 39.2% |
| May | 76.1% | 54.8% | ▼ 28.0% |
| June | 88.5% | 53.9% | ▼ 39.1% |
| July | 90.9% | 50.0% | ▼ 45.0% |
| August | 86.8% | – | – |
| September | 82.1% | – | – |
| October | 77.4% | – | in progress |
| November | 81.3% | – | – |
| December | 55.3% | – | – |
| Year-to-date average (Jan–Jul) | 80.1% | 68.6% | ▼ 14.3% |
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 | 0 | – |
| February | 0 | 0 | – |
| March | 0 | 1 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 1 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 0 | 1 |
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% 715
- Cancelled 0.6% 4
Share of all recorded flights in the period, all legs. · Oct 13, 2024 → Jul 31, 2026
On time, leg by leg
Departures within 15 minutes of schedule; small figure = departures recorded.
Legs flown under this number
7| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| DEN PHL Denver International Airport – Philadelphia International Airport | 2,501 | 14.5 min | 70.6% | 121 |
| STL LAX St. Louis Lambert International Airport – Los Angeles International Airport | 2,557 | 12.8 min | 79.0% | 57 |
| SEA PHX Seattle–Tacoma International Airport – Phoenix Sky Harbor International Airport | 1,782 | 24.6 min | 54.0% | 50 |
| HOU PIT William P. Hobby Airport – Pittsburgh International Airport | 1,820 | 14.6 min | 71.7% | 46 |
| SAN RNO San Diego International Airport – Reno Tahoe International Airport | 787 | 16.5 min | 78.6% | 42 |
| SNA DEN John Wayne Orange County International Airport – Denver International Airport | 1,360 | 5.8 min | 88.2% | 34 |
| MDW RSW Chicago Midway International Airport – Southwest Florida International Airport | 1,782 | -1.5 min | 100.0% | 30 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 17 | 17 | 94.1% | 0 |
| November 2024 | 29 | 27 | 74.1% | 2 |
| December 2024 | 32 | 32 | 68.8% | 0 |
| January 2025 | 31 | 31 | 71.0% | 0 |
| February 2025 | 28 | 28 | 67.9% | 0 |
| March 2025 | 53 | 53 | 81.1% | 0 |
| April 2025 | 61 | 61 | 85.3% | 0 |
| May 2025 | 67 | 67 | 76.1% | 0 |
| June 2025 | 26 | 26 | 88.5% | 0 |
| July 2025 | 22 | 22 | 90.9% | 0 |
| August 2025 | 38 | 38 | 86.8% | 0 |
| September 2025 | 39 | 39 | 82.1% | 0 |
| October 2025 | 32 | 31 | 77.4% | 1 |
| November 2025 | 32 | 32 | 81.3% | 0 |
| December 2025 | 47 | 47 | 55.3% | 0 |
| January 2026 | 17 | 17 | 82.4% | 0 |
| February 2026 | 19 | 19 | 100.0% | 0 |
| March 2026 | 17 | 16 | 87.5% | 1 |
| April 2026 | 27 | 27 | 51.9% | 0 |
| May 2026 | 31 | 31 | 54.8% | 0 |
| June 2026 | 26 | 26 | 53.9% | 0 |
| July 2026 | 28 | 28 | 50.0% | 0 |