WN4534
WN4534 (Southwest Airlines) is a multi-stop service on 12 routes, busiest Detroit to Baltimore. Of 283 departures recorded from October 2024 to July 2026, 76.0% left on time, according to the US BTS.
- On-time departures76.0%of 283 flights
- Average delay18.9 min
- July 202630▲ 275.0%vs July 2025
- Cancelled0.0%
- Legs flown under this number12
Recorded departures by month
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods14 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | – | 3 | – |
| February | – | 1 | – |
| March | – | 21 | – |
| April | 32 | 29 | ▼ 9.4% |
| May | 45 | 31 | ▼ 31.1% |
| June | 13 | 30 | ▲ 130.8% |
| July | 8 | 30 | ▲ 275.0% |
| August | 2 | – | – |
| September | – | – | – |
| October | – | – | in progress |
| November | 4 | – | – |
| December | 11 | – | – |
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 periods14 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | – | 0.0% | – |
| February | – | 100.0% | – |
| March | – | 66.7% | – |
| April | 87.5% | 89.7% | ▲ 2.5% |
| May | 44.4% | 96.8% | ▲ 117.8% |
| June | 61.5% | 83.3% | ▲ 35.4% |
| July | 75.0% | 90.0% | ▲ 20.0% |
| August | 50.0% | – | – |
| September | – | – | – |
| October | – | – | in progress |
| November | 75.0% | – | – |
| December | 54.6% | – | – |
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 periods14 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | – | 0 | – |
| February | – | 0 | – |
| March | – | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | – | – | – |
| October | – | – | in progress |
| November | 0 | – | – |
| December | 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 100.0% 283
- Cancelled 0.0% 0
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
4| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| TPA BNA Tampa International Airport – Nashville International Airport | 987 | 2.7 min | 93.0% | 57 |
| DTW BWI Detroit Metropolitan Wayne County Airport – Baltimore/Washington International Thurgood Marshall Airport | 657 | 3.4 min | 87.7% | 57 |
| DCA MCO Ronald Reagan Washington National Airport – Orlando International Airport | 1,224 | 34.6 min | 64.0% | 50 |
| PVD DCA Rhode Island T. F. Green International Airport – Ronald Reagan Washington National Airport | 573 | 49.6 min | 62.5% | 32 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 90.0% | 0 |
| November 2024 | 2 | 2 | 50.0% | 0 |
| December 2024 | 1 | 1 | 100.0% | 0 |
| April 2025 | 32 | 32 | 87.5% | 0 |
| May 2025 | 45 | 45 | 44.4% | 0 |
| June 2025 | 13 | 13 | 61.5% | 0 |
| July 2025 | 8 | 8 | 75.0% | 0 |
| August 2025 | 2 | 2 | 50.0% | 0 |
| November 2025 | 4 | 4 | 75.0% | 0 |
| December 2025 | 11 | 11 | 54.6% | 0 |
| January 2026 | 3 | 3 | 0.0% | 0 |
| February 2026 | 1 | 1 | 100.0% | 0 |
| March 2026 | 21 | 21 | 66.7% | 0 |
| April 2026 | 29 | 29 | 89.7% | 0 |
| May 2026 | 31 | 31 | 96.8% | 0 |
| June 2026 | 30 | 30 | 83.3% | 0 |
| July 2026 | 30 | 30 | 90.0% | 0 |