WN1639
WN1639 (Southwest Airlines) is a multi-stop service on 28 routes, busiest Baltimore to Charleston. Of 468 departures recorded from October 2024 to July 2026, 73.9% left on time, according to the US BTS.
- On-time departures73.9%of 468 flights
- Average delay13.6 min
- July 202620▼ 35.5%vs July 2025
- Cancelled0.9%
- Legs flown under this number28
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 | 45 | ▲ 2,150.0% |
| February | 10 | 34 | ▲ 240.0% |
| March | 24 | 33 | ▲ 37.5% |
| April | 20 | 27 | ▲ 35.0% |
| May | 17 | 26 | ▲ 52.9% |
| June | 29 | 19 | ▼ 34.5% |
| July | 31 | 20 | ▼ 35.5% |
| August | 22 | – | – |
| September | 21 | – | – |
| October | 26 | – | in progress |
| November | 19 | – | – |
| December | 8 | – | – |
| Year to date (Jan–Jul) | 133 | 204 | ▲ 53.4% |
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 | 100.0% | 84.4% | ▼ 15.6% |
| February | 80.0% | 67.7% | ▼ 15.4% |
| March | 91.7% | 84.9% | ▼ 7.4% |
| April | 95.0% | 76.9% | ▼ 19.0% |
| May | 64.7% | 50.0% | ▼ 22.7% |
| June | 57.1% | 31.6% | ▼ 44.7% |
| July | 58.6% | 60.0% | ▲ 2.4% |
| August | 77.3% | – | – |
| September | 100.0% | – | – |
| October | 84.6% | – | in progress |
| November | 89.5% | – | – |
| December | 75.0% | – | – |
| Year-to-date average (Jan–Jul) | 78.2% | 65.1% | ▼ 16.8% |
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 | 0 | – |
| April | 0 | 1 | – |
| May | 0 | 0 | – |
| June | 1 | 0 | ▼ 100.0% |
| July | 2 | 0 | ▼ 100.0% |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 3 | 1 | ▼ 66.7% |
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 99.1% 464
- Cancelled 0.9% 4
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
6| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| BWI CHS Baltimore/Washington International Thurgood Marshall Airport – Charleston International Airport | 761 | 31.0 min | 56.1% | 60 |
| MDW LAS Chicago Midway International Airport – Harry Reid International Airport | 2,442 | 25.5 min | 57.1% | 50 |
| DEN SLC Denver International Airport – Salt Lake City International Airport | 628 | 12.2 min | 72.0% | 50 |
| SFO DEN San Francisco International Airport – Denver International Airport | 1,553 | 7.6 min | 79.4% | 34 |
| DEN MSP Denver International Airport – Minneapolis–Saint Paul International Airport / Wold–Chamberlain Field | 1,092 | 20.7 min | 44.1% | 34 |
| COS HOU City of Colorado Springs Municipal Airport – William P. Hobby Airport | 1,336 | -0.1 min | 90.9% | 33 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 16 | 16 | 75.0% | 0 |
| November 2024 | 6 | 6 | 83.3% | 0 |
| December 2024 | 13 | 13 | 61.5% | 0 |
| January 2025 | 2 | 2 | 100.0% | 0 |
| February 2025 | 10 | 10 | 80.0% | 0 |
| March 2025 | 24 | 24 | 91.7% | 0 |
| April 2025 | 20 | 20 | 95.0% | 0 |
| May 2025 | 17 | 17 | 64.7% | 0 |
| June 2025 | 29 | 28 | 57.1% | 1 |
| July 2025 | 31 | 29 | 58.6% | 2 |
| August 2025 | 22 | 22 | 77.3% | 0 |
| September 2025 | 21 | 21 | 100.0% | 0 |
| October 2025 | 26 | 26 | 84.6% | 0 |
| November 2025 | 19 | 19 | 89.5% | 0 |
| December 2025 | 8 | 8 | 75.0% | 0 |
| January 2026 | 45 | 45 | 84.4% | 0 |
| February 2026 | 34 | 34 | 67.7% | 0 |
| March 2026 | 33 | 33 | 84.9% | 0 |
| April 2026 | 27 | 26 | 76.9% | 1 |
| May 2026 | 26 | 26 | 50.0% | 0 |
| June 2026 | 19 | 19 | 31.6% | 0 |
| July 2026 | 20 | 20 | 60.0% | 0 |