WN138
WN138 (Southwest Airlines) is a multi-stop service on 39 routes, busiest Baltimore to Chicago. Of 745 departures recorded from October 2024 to July 2026, 72.4% left on time, according to the US BTS.
- On-time departures72.4%of 745 flights
- Average delay15.3 min
- July 202665▲ 85.7%vs July 2025
- Cancelled0.7%
- Legs flown under this number39
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 | 31 | 30 | ▼ 3.2% |
| February | 30 | 28 | ▼ 6.7% |
| March | 32 | 31 | ▼ 3.1% |
| April | 30 | 22 | ▼ 26.7% |
| May | 31 | 23 | ▼ 25.8% |
| June | 34 | 56 | ▲ 64.7% |
| July | 35 | 65 | ▲ 85.7% |
| August | 35 | – | – |
| September | 34 | – | – |
| October | 57 | – | in progress |
| November | 30 | – | – |
| December | 29 | – | – |
| Year to date (Jan–Jul) | 223 | 255 | ▲ 14.3% |
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 | 80.7% | 82.8% | ▲ 2.6% |
| February | 86.7% | 50.0% | ▼ 42.3% |
| March | 71.9% | 71.0% | ▼ 1.3% |
| April | 86.7% | 68.2% | ▼ 21.3% |
| May | 83.3% | 36.4% | ▼ 56.4% |
| June | 85.3% | 61.1% | ▼ 28.4% |
| July | 94.3% | 53.9% | ▼ 42.9% |
| August | 74.3% | – | – |
| September | 73.5% | – | – |
| October | 57.9% | – | in progress |
| November | 73.3% | – | – |
| December | 58.6% | – | – |
| Year-to-date average (Jan–Jul) | 84.1% | 60.5% | ▼ 28.1% |
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 | 0 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 1 | 1 | 0.0% |
| June | 0 | 2 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 1 | 4 | ▲ 300.0% |
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% 740
- Cancelled 0.7% 5
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
11Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 90.0% | 0 |
| November 2024 | 30 | 30 | 96.7% | 0 |
| December 2024 | 32 | 32 | 87.5% | 0 |
| January 2025 | 31 | 31 | 80.7% | 0 |
| February 2025 | 30 | 30 | 86.7% | 0 |
| March 2025 | 32 | 32 | 71.9% | 0 |
| April 2025 | 30 | 30 | 86.7% | 0 |
| May 2025 | 31 | 30 | 83.3% | 1 |
| June 2025 | 34 | 34 | 85.3% | 0 |
| July 2025 | 35 | 35 | 94.3% | 0 |
| August 2025 | 35 | 35 | 74.3% | 0 |
| September 2025 | 34 | 34 | 73.5% | 0 |
| October 2025 | 57 | 57 | 57.9% | 0 |
| November 2025 | 30 | 30 | 73.3% | 0 |
| December 2025 | 29 | 29 | 58.6% | 0 |
| January 2026 | 30 | 29 | 82.8% | 1 |
| February 2026 | 28 | 28 | 50.0% | 0 |
| March 2026 | 31 | 31 | 71.0% | 0 |
| April 2026 | 22 | 22 | 68.2% | 0 |
| May 2026 | 23 | 22 | 36.4% | 1 |
| June 2026 | 56 | 54 | 61.1% | 2 |
| July 2026 | 65 | 65 | 53.9% | 0 |