WN1021
WN1021 (Southwest Airlines) is a multi-stop service on 37 routes, busiest Washington to Houston. Of 608 departures recorded from October 2024 to July 2026, 78.6% left on time, according to the US BTS.
- On-time departures78.6%of 608 flights
- Average delay9.8 min
- July 202613▼ 27.8%vs July 2025
- Cancelled0.8%
- Legs flown under this number37
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 | 28 | 31 | ▲ 10.7% |
| February | 24 | 28 | ▲ 16.7% |
| March | 52 | 26 | ▼ 50.0% |
| April | 36 | 28 | ▼ 22.2% |
| May | 31 | 31 | 0.0% |
| June | 18 | 14 | ▼ 22.2% |
| July | 18 | 13 | ▼ 27.8% |
| August | 29 | – | – |
| September | 30 | – | – |
| October | 6 | – | in progress |
| November | 43 | – | – |
| December | 37 | – | – |
| Year to date (Jan–Jul) | 207 | 171 | ▼ 17.4% |
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 | 65.4% | 83.9% | ▲ 28.3% |
| February | 79.2% | 75.0% | ▼ 5.3% |
| March | 84.0% | 57.7% | ▼ 31.3% |
| April | 94.4% | 89.3% | ▼ 5.5% |
| May | 83.9% | 67.7% | ▼ 19.2% |
| June | 77.8% | 50.0% | ▼ 35.7% |
| July | 77.8% | 61.5% | ▼ 20.9% |
| August | 96.6% | – | – |
| September | 90.0% | – | – |
| October | 66.7% | – | in progress |
| November | 78.6% | – | – |
| December | 54.1% | – | – |
| Year-to-date average (Jan–Jul) | 80.3% | 69.3% | ▼ 13.7% |
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 | 2 | 0 | ▼ 100.0% |
| February | 0 | 0 | – |
| March | 2 | 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) | 4 | 0 | ▼ 100.0% |
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 99.2% 603
- Cancelled 0.8% 5
Share of all recorded flights in the period, all legs. · Oct 12, 2024 → Jul 29, 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 |
|---|---|---|---|---|
| DCA HOU Ronald Reagan Washington National Airport – William P. Hobby Airport | 1,959 | 7.1 min | 85.4% | 91 |
| SAN SFO San Diego International Airport – San Francisco International Airport | 719 | 10.2 min | 81.0% | 58 |
| BWI SLC Baltimore/Washington International Thurgood Marshall Airport – Salt Lake City International Airport | 2,994 | 9.1 min | 87.9% | 58 |
| MDW SAN Chicago Midway International Airport – San Diego International Airport | 2,776 | 15.6 min | 68.3% | 41 |
| OMA PHX Eppley Airfield – Phoenix Sky Harbor International Airport | 1,667 | 3.8 min | 87.5% | 33 |
| ECP AUS Northwest Florida Beaches International Airport – Austin Bergstrom International Airport | 1,139 | 15.8 min | 78.8% | 33 |
| MDW PHX Chicago Midway International Airport – Phoenix Sky Harbor International Airport | 2,319 | 0.5 min | 96.7% | 30 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 95.0% | 0 |
| November 2024 | 31 | 31 | 87.1% | 0 |
| December 2024 | 34 | 34 | 79.4% | 0 |
| January 2025 | 28 | 26 | 65.4% | 2 |
| February 2025 | 24 | 24 | 79.2% | 0 |
| March 2025 | 52 | 50 | 84.0% | 2 |
| April 2025 | 36 | 36 | 94.4% | 0 |
| May 2025 | 31 | 31 | 83.9% | 0 |
| June 2025 | 18 | 18 | 77.8% | 0 |
| July 2025 | 18 | 18 | 77.8% | 0 |
| August 2025 | 29 | 29 | 96.6% | 0 |
| September 2025 | 30 | 30 | 90.0% | 0 |
| October 2025 | 6 | 6 | 66.7% | 0 |
| November 2025 | 43 | 42 | 78.6% | 1 |
| December 2025 | 37 | 37 | 54.1% | 0 |
| January 2026 | 31 | 31 | 83.9% | 0 |
| February 2026 | 28 | 28 | 75.0% | 0 |
| March 2026 | 26 | 26 | 57.7% | 0 |
| April 2026 | 28 | 28 | 89.3% | 0 |
| May 2026 | 31 | 31 | 67.7% | 0 |
| June 2026 | 14 | 14 | 50.0% | 0 |
| July 2026 | 13 | 13 | 61.5% | 0 |