WN1438
WN1438 (Southwest Airlines) is a multi-stop service on 35 routes, busiest Boston to St Louis. Of 765 departures recorded from October 2024 to July 2026, 75.0% left on time, according to the US BTS.
- On-time departures75.0%of 765 flights
- Average delay16.2 min
- July 20265▼ 88.4%vs July 2025
- Cancelled0.7%
- Legs flown under this number35
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 | 53 | 31 | ▼ 41.5% |
| February | 52 | 28 | ▼ 46.2% |
| March | 39 | 31 | ▼ 20.5% |
| April | 54 | 33 | ▼ 38.9% |
| May | 62 | 36 | ▼ 41.9% |
| June | 46 | 7 | ▼ 84.8% |
| July | 43 | 5 | ▼ 88.4% |
| August | 41 | – | – |
| September | 38 | – | – |
| October | 39 | – | in progress |
| November | 30 | – | – |
| December | 31 | – | – |
| Year to date (Jan–Jul) | 349 | 171 | ▼ 51.0% |
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 | 67.3% | 93.6% | ▲ 39.0% |
| February | 73.1% | 57.1% | ▼ 21.8% |
| March | 89.7% | 90.3% | ▲ 0.6% |
| April | 86.8% | 69.7% | ▼ 19.7% |
| May | 83.6% | 83.3% | ▼ 0.3% |
| June | 41.3% | 14.3% | ▼ 65.4% |
| July | 26.2% | 0.0% | ▼ 100.0% |
| August | 68.3% | – | – |
| September | 92.1% | – | – |
| October | 79.5% | – | in progress |
| November | 93.3% | – | – |
| December | 87.1% | – | – |
| Year-to-date average (Jan–Jul) | 66.9% | 58.3% | ▼ 12.8% |
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 | 1 | 0 | ▼ 100.0% |
| February | 0 | 0 | – |
| March | 0 | 0 | – |
| April | 1 | 0 | ▼ 100.0% |
| May | 1 | 0 | ▼ 100.0% |
| June | 0 | 0 | – |
| July | 1 | 1 | 0.0% |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 4 | 1 | ▼ 75.0% |
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 99.3% 760
- Cancelled 0.7% 5
Share of all recorded flights in the period, all legs. · Oct 13, 2024 → Jul 26, 2026
On time, leg by leg
Departures within 15 minutes of schedule; small figure = departures recorded.
Legs flown under this number
11Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 11 | 11 | 90.9% | 0 |
| November 2024 | 27 | 27 | 92.6% | 0 |
| December 2024 | 28 | 28 | 85.7% | 0 |
| January 2025 | 53 | 52 | 67.3% | 1 |
| February 2025 | 52 | 52 | 73.1% | 0 |
| March 2025 | 39 | 39 | 89.7% | 0 |
| April 2025 | 54 | 53 | 86.8% | 1 |
| May 2025 | 62 | 61 | 83.6% | 1 |
| June 2025 | 46 | 46 | 41.3% | 0 |
| July 2025 | 43 | 42 | 26.2% | 1 |
| August 2025 | 41 | 41 | 68.3% | 0 |
| September 2025 | 38 | 38 | 92.1% | 0 |
| October 2025 | 39 | 39 | 79.5% | 0 |
| November 2025 | 30 | 30 | 93.3% | 0 |
| December 2025 | 31 | 31 | 87.1% | 0 |
| January 2026 | 31 | 31 | 93.6% | 0 |
| February 2026 | 28 | 28 | 57.1% | 0 |
| March 2026 | 31 | 31 | 90.3% | 0 |
| April 2026 | 33 | 33 | 69.7% | 0 |
| May 2026 | 36 | 36 | 83.3% | 0 |
| June 2026 | 7 | 7 | 14.3% | 0 |
| July 2026 | 5 | 4 | 0.0% | 1 |