WN1599
WN1599 (Southwest Airlines) is a multi-stop service on 24 routes, busiest Denver to Houston. Of 717 departures recorded from October 2024 to July 2026, 75.4% left on time, according to the US BTS.
- On-time departures75.4%of 717 flights
- Average delay13.0 min
- July 202670▲ 268.4%vs July 2025
- Cancelled2.4%
- Legs flown under this number24
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 | 31 | ▲ 10.7% |
| February | 24 | 25 | ▲ 4.2% |
| March | 26 | 43 | ▲ 65.4% |
| April | 35 | 33 | ▼ 5.7% |
| May | 41 | 31 | ▼ 24.4% |
| June | 18 | 64 | ▲ 255.6% |
| July | 19 | 70 | ▲ 268.4% |
| August | 25 | – | – |
| September | 26 | – | – |
| October | 40 | – | in progress |
| November | 29 | – | – |
| December | 31 | – | – |
| Year to date (Jan–Jul) | 191 | 297 | ▲ 55.5% |
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 | 69.2% | 82.8% | ▲ 19.5% |
| February | 75.0% | 84.0% | ▲ 12.0% |
| March | 88.5% | 85.4% | ▼ 3.5% |
| April | 71.4% | 100.0% | ▲ 40.0% |
| May | 90.2% | 100.0% | ▲ 10.8% |
| June | 31.3% | 50.0% | ▲ 60.0% |
| July | 40.0% | 55.7% | ▲ 39.3% |
| August | 68.0% | – | – |
| September | 92.0% | – | – |
| October | 97.5% | – | in progress |
| November | 96.2% | – | – |
| December | 76.7% | – | – |
| Year-to-date average (Jan–Jul) | 66.5% | 79.7% | ▲ 19.8% |
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 | 2 | 0.0% |
| February | 0 | 0 | – |
| March | 0 | 2 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 2 | 0 | ▼ 100.0% |
| July | 4 | 0 | ▼ 100.0% |
| August | 0 | – | – |
| September | 1 | – | – |
| October | 0 | – | in progress |
| November | 3 | – | – |
| December | 1 | – | – |
| Year to date (Jan–Jul) | 8 | 4 | ▼ 50.0% |
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 97.6% 700
- Cancelled 2.4% 17
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
88 of 8
| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| DEN HOU Denver International Airport – William P. Hobby Airport | 1,422 | 16.1 min | 70.4% | 110 |
| BWI BOS Baltimore/Washington International Thurgood Marshall Airport – Boston Logan International Airport | 594 | 23.6 min | 67.4% | 99 |
| SLC PHX Salt Lake City International Airport – Phoenix Sky Harbor International Airport | 818 | -3.5 min | 100.0% | 58 |
| TUS DEN Tucson International Airport – Denver International Airport | 1,029 | 48.0 min | 36.8% | 57 |
| BUR SMF Hollywood Burbank/Bob Hope Airport – Sacramento International Airport | 577 | 4.7 min | 81.6% | 50 |
| BNA MSY Nashville International Airport – Louis Armstrong New Orleans International Airport | 759 | 2.8 min | 84.4% | 47 |
| LAS TUS Harry Reid International Airport – Tucson International Airport | 587 | 7.1 min | 78.6% | 42 |
| PHX TUS Phoenix Sky Harbor International Airport – Tucson International Airport | 178 | 14.4 min | 71.0% | 31 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 70.0% | 0 |
| November 2024 | 28 | 28 | 78.6% | 0 |
| December 2024 | 30 | 30 | 60.0% | 0 |
| January 2025 | 28 | 26 | 69.2% | 2 |
| February 2025 | 24 | 24 | 75.0% | 0 |
| March 2025 | 26 | 26 | 88.5% | 0 |
| April 2025 | 35 | 35 | 71.4% | 0 |
| May 2025 | 41 | 41 | 90.2% | 0 |
| June 2025 | 18 | 16 | 31.3% | 2 |
| July 2025 | 19 | 15 | 40.0% | 4 |
| August 2025 | 25 | 25 | 68.0% | 0 |
| September 2025 | 26 | 25 | 92.0% | 1 |
| October 2025 | 40 | 40 | 97.5% | 0 |
| November 2025 | 29 | 26 | 96.2% | 3 |
| December 2025 | 31 | 30 | 76.7% | 1 |
| January 2026 | 31 | 29 | 82.8% | 2 |
| February 2026 | 25 | 25 | 84.0% | 0 |
| March 2026 | 43 | 41 | 85.4% | 2 |
| April 2026 | 33 | 33 | 100.0% | 0 |
| May 2026 | 31 | 31 | 100.0% | 0 |
| June 2026 | 64 | 64 | 50.0% | 0 |
| July 2026 | 70 | 70 | 55.7% | 0 |