WN277
WN277 (Southwest Airlines) is a multi-stop service on 42 routes, busiest Baltimore to Boston. Of 773 departures recorded from October 2024 to July 2026, 77.0% left on time, according to the US BTS.
- On-time departures77.0%of 773 flights
- Average delay13.1 min
- July 202659▲ 90.3%vs July 2025
- Cancelled0.7%
- Legs flown under this number42
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 | 35 | 32 | ▼ 8.6% |
| February | 30 | 34 | ▲ 13.3% |
| March | 31 | 32 | ▲ 3.2% |
| April | 33 | 40 | ▲ 21.2% |
| May | 36 | 45 | ▲ 25.0% |
| June | 30 | 54 | ▲ 80.0% |
| July | 31 | 59 | ▲ 90.3% |
| August | 37 | – | – |
| September | 38 | – | – |
| October | 18 | – | in progress |
| November | 55 | – | – |
| December | 39 | – | – |
| Year to date (Jan–Jul) | 226 | 296 | ▲ 31.0% |
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 | 79.4% | 96.9% | ▲ 22.0% |
| February | 100.0% | 82.4% | ▼ 17.7% |
| March | 80.7% | 58.1% | ▼ 28.0% |
| April | 60.6% | 90.0% | ▲ 48.5% |
| May | 66.7% | 91.1% | ▲ 36.7% |
| June | 76.7% | 48.2% | ▼ 37.2% |
| July | 77.4% | 40.7% | ▼ 47.5% |
| August | 88.9% | – | – |
| September | 94.7% | – | – |
| October | 83.3% | – | in progress |
| November | 94.4% | – | – |
| December | 92.1% | – | – |
| Year-to-date average (Jan–Jul) | 77.3% | 72.5% | ▼ 6.3% |
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 | 1 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 1 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 1 | – | – |
| December | 1 | – | – |
| Year to date (Jan–Jul) | 1 | 1 | 0.0% |
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 99.4% 768
- Cancelled 0.6% 5
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
11Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 17 | 17 | 70.6% | 0 |
| November 2024 | 18 | 18 | 72.2% | 0 |
| December 2024 | 29 | 29 | 69.0% | 0 |
| January 2025 | 35 | 34 | 79.4% | 1 |
| February 2025 | 30 | 30 | 100.0% | 0 |
| March 2025 | 31 | 31 | 80.7% | 0 |
| April 2025 | 33 | 33 | 60.6% | 0 |
| May 2025 | 36 | 36 | 66.7% | 0 |
| June 2025 | 30 | 30 | 76.7% | 0 |
| July 2025 | 31 | 31 | 77.4% | 0 |
| August 2025 | 37 | 36 | 88.9% | 1 |
| September 2025 | 38 | 38 | 94.7% | 0 |
| October 2025 | 18 | 18 | 83.3% | 0 |
| November 2025 | 55 | 54 | 94.4% | 1 |
| December 2025 | 39 | 38 | 92.1% | 1 |
| January 2026 | 32 | 32 | 96.9% | 0 |
| February 2026 | 34 | 34 | 82.4% | 0 |
| March 2026 | 32 | 31 | 58.1% | 1 |
| April 2026 | 40 | 40 | 90.0% | 0 |
| May 2026 | 45 | 45 | 91.1% | 0 |
| June 2026 | 54 | 54 | 48.2% | 0 |
| July 2026 | 59 | 59 | 40.7% | 0 |