WN4687
WN4687 (Southwest Airlines) is a multi-stop service on 10 routes, busiest Baltimore to Portland. Of 167 departures recorded from October 2024 to July 2026, 62.6% left on time, according to the US BTS.
- On-time departures62.6%of 167 flights
- Average delay18.3 min
- July 202631▲ 520.0%vs July 2025
- Cancelled2.4%
- Legs flown under this number10
Recorded departures by month
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods17 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 5 | 28 | ▲ 460.0% |
| February | 7 | 28 | ▲ 300.0% |
| March | 1 | 7 | ▲ 600.0% |
| April | 3 | 4 | ▲ 33.3% |
| May | 3 | 4 | ▲ 33.3% |
| June | 5 | 27 | ▲ 440.0% |
| July | 5 | 31 | ▲ 520.0% |
| August | 1 | – | – |
| September | – | – | – |
| October | – | – | in progress |
| November | 2 | – | – |
| December | 3 | – | – |
| Year to date (Jan–Jul) | 29 | 129 | ▲ 344.8% |
according to the US BTS · October 2024 → July 2026
On-time departures by month
Months without data are left blank.
On time = departure within 15 minutes of schedule. Non-cancelled flights with a recorded delay only.
The most recent periods17 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 100.0% | 73.1% | ▼ 26.9% |
| February | 100.0% | 65.4% | ▼ 34.6% |
| March | 100.0% | 57.1% | ▼ 42.9% |
| April | 100.0% | 50.0% | ▼ 50.0% |
| May | 66.7% | 75.0% | ▲ 12.5% |
| June | 40.0% | 51.9% | ▲ 29.6% |
| July | 40.0% | 48.4% | ▲ 21.0% |
| August | 0.0% | – | – |
| September | – | – | – |
| October | – | – | in progress |
| November | 50.0% | – | – |
| December | 66.7% | – | – |
| Year-to-date average (Jan–Jul) | 78.1% | 60.1% | ▼ 23.0% |
according to the US BTS · October 2024 → July 2026
Average departure delay by month
Months without data are left blank.
according to the US BTS · October 2024 → July 2026
Cancelled departures by month
Months without data are left blank.
The most recent periods17 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 2 | – |
| February | 0 | 2 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | – | – | – |
| October | – | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 0 | 4 |
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 97.6% 163
- Cancelled 2.4% 4
Share of all recorded flights in the period, all legs. · Oct 13, 2024 → Jul 31, 2026
On time, leg by leg
Departures within 15 minutes of schedule; small figure = departures recorded.
Legs flown under this number
2| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| BWI PWM Baltimore/Washington International Thurgood Marshall Airport – Portland International Jetport | 727 | 12.4 min | 72.2% | 58 |
| BNA LIT Nashville International Airport – Bill & Hillary Clinton National Airport/Adams Field | 526 | 26.7 min | 50.9% | 57 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 3 | 3 | 100.0% | 0 |
| January 2025 | 5 | 5 | 100.0% | 0 |
| February 2025 | 7 | 7 | 100.0% | 0 |
| March 2025 | 1 | 1 | 100.0% | 0 |
| April 2025 | 3 | 3 | 100.0% | 0 |
| May 2025 | 3 | 3 | 66.7% | 0 |
| June 2025 | 5 | 5 | 40.0% | 0 |
| July 2025 | 5 | 5 | 40.0% | 0 |
| August 2025 | 1 | 1 | 0.0% | 0 |
| November 2025 | 2 | 2 | 50.0% | 0 |
| December 2025 | 3 | 3 | 66.7% | 0 |
| January 2026 | 28 | 26 | 73.1% | 2 |
| February 2026 | 28 | 26 | 65.4% | 2 |
| March 2026 | 7 | 7 | 57.1% | 0 |
| April 2026 | 4 | 4 | 50.0% | 0 |
| May 2026 | 4 | 4 | 75.0% | 0 |
| June 2026 | 27 | 27 | 51.9% | 0 |
| July 2026 | 31 | 31 | 48.4% | 0 |