WN4573
WN4573 (Southwest Airlines) is a multi-stop service on 20 routes, busiest Baltimore to Hartford. Of 432 departures recorded from October 2024 to July 2026, 71.8% left on time, according to the US BTS.
- On-time departures71.8%of 432 flights
- Average delay18.7 min
- July 202618▼ 18.2%vs July 2025
- Cancelled1.6%
- Legs flown under this number20
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 | 2 | 29 | ▲ 1,350.0% |
| February | 8 | 28 | ▲ 250.0% |
| March | 1 | 31 | ▲ 3,000.0% |
| April | 29 | 22 | ▼ 24.1% |
| May | 40 | 16 | ▼ 60.0% |
| June | 23 | 20 | ▼ 13.0% |
| July | 22 | 18 | ▼ 18.2% |
| August | 13 | – | – |
| September | 13 | – | – |
| October | 31 | – | in progress |
| November | 21 | – | – |
| December | 19 | – | – |
| Year to date (Jan–Jul) | 125 | 164 | ▲ 31.2% |
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 | 100.0% | 64.3% | ▼ 35.7% |
| February | 62.5% | 76.9% | ▲ 23.1% |
| March | 100.0% | 73.3% | ▼ 26.7% |
| April | 69.0% | 95.5% | ▲ 38.4% |
| May | 47.5% | 100.0% | ▲ 110.5% |
| June | 54.6% | 80.0% | ▲ 46.7% |
| July | 47.6% | 77.8% | ▲ 63.3% |
| August | 61.5% | – | – |
| September | 84.6% | – | – |
| October | 58.1% | – | in progress |
| November | 71.4% | – | – |
| December | 94.7% | – | – |
| Year-to-date average (Jan–Jul) | 68.7% | 81.1% | ▲ 18.0% |
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 | 1 | – |
| February | 0 | 2 | – |
| March | 0 | 1 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 1 | 0 | ▼ 100.0% |
| July | 1 | 0 | ▼ 100.0% |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 2 | 4 | ▲ 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 98.4% 425
- Cancelled 1.6% 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
7| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| BWI BDL Baltimore/Washington International Thurgood Marshall Airport – Bradley International Airport | 455 | 16.6 min | 67.3% | 58 |
| SMF SAN Sacramento International Airport – San Diego International Airport | 773 | 31.2 min | 47.5% | 42 |
| HOU MCO William P. Hobby Airport – Orlando International Airport | 1,364 | 29.5 min | 57.1% | 42 |
| LGA MDW LaGuardia Airport – Chicago Midway International Airport | 1,164 | 13.2 min | 76.5% | 34 |
| TPA LAS Tampa International Airport – Harry Reid International Airport | 3,188 | 26.2 min | 78.1% | 33 |
| MCO BUF Orlando International Airport – Buffalo Niagara International Airport | 1,630 | 44.5 min | 56.3% | 32 |
| STL DEN St. Louis Lambert International Airport – Denver International Airport | 1,236 | 27.3 min | 58.1% | 31 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 34 | 34 | 85.3% | 0 |
| November 2024 | 8 | 8 | 100.0% | 0 |
| December 2024 | 4 | 3 | 66.7% | 1 |
| January 2025 | 2 | 2 | 100.0% | 0 |
| February 2025 | 8 | 8 | 62.5% | 0 |
| March 2025 | 1 | 1 | 100.0% | 0 |
| April 2025 | 29 | 29 | 69.0% | 0 |
| May 2025 | 40 | 40 | 47.5% | 0 |
| June 2025 | 23 | 22 | 54.6% | 1 |
| July 2025 | 22 | 21 | 47.6% | 1 |
| August 2025 | 13 | 13 | 61.5% | 0 |
| September 2025 | 13 | 13 | 84.6% | 0 |
| October 2025 | 31 | 31 | 58.1% | 0 |
| November 2025 | 21 | 21 | 71.4% | 0 |
| December 2025 | 19 | 19 | 94.7% | 0 |
| January 2026 | 29 | 28 | 64.3% | 1 |
| February 2026 | 28 | 26 | 76.9% | 2 |
| March 2026 | 31 | 30 | 73.3% | 1 |
| April 2026 | 22 | 22 | 95.5% | 0 |
| May 2026 | 16 | 16 | 100.0% | 0 |
| June 2026 | 20 | 20 | 80.0% | 0 |
| July 2026 | 18 | 18 | 77.8% | 0 |