WN677
WN677 (Southwest Airlines) is a multi-stop service on 27 routes, busiest Denver to Dulles. Of 692 departures recorded from October 2024 to July 2026, 79.5% left on time, according to the US BTS.
- On-time departures79.5%of 692 flights
- Average delay9.2 min
- July 202632▲ 0.0%vs July 2025
- Cancelled0.9%
- Legs flown under this number27
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 | 30 | 30 | 0.0% |
| February | 28 | 28 | 0.0% |
| March | 25 | 30 | ▲ 20.0% |
| April | 28 | 40 | ▲ 42.9% |
| May | 31 | 44 | ▲ 41.9% |
| June | 28 | 31 | ▲ 10.7% |
| July | 32 | 32 | 0.0% |
| August | 49 | – | – |
| September | 55 | – | – |
| October | 30 | – | in progress |
| November | 28 | – | – |
| December | 29 | – | – |
| Year to date (Jan–Jul) | 202 | 235 | ▲ 16.3% |
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 | 76.7% | 89.7% | ▲ 16.9% |
| February | 89.3% | 92.6% | ▲ 3.7% |
| March | 80.0% | 70.0% | ▼ 12.5% |
| April | 85.2% | 65.0% | ▼ 23.7% |
| May | 93.6% | 77.3% | ▼ 17.4% |
| June | 82.1% | 61.3% | ▼ 25.4% |
| July | 96.9% | 59.4% | ▼ 38.7% |
| August | 69.4% | – | – |
| September | 80.0% | – | – |
| October | 100.0% | – | in progress |
| November | 85.2% | – | – |
| December | 82.1% | – | – |
| Year-to-date average (Jan–Jul) | 86.2% | 73.6% | ▼ 14.7% |
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 | 1 | – |
| March | 0 | 0 | – |
| April | 1 | 0 | ▼ 100.0% |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 1 | – | – |
| December | 1 | – | – |
| Year to date (Jan–Jul) | 1 | 2 | ▲ 100.0% |
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 99.1% 686
- Cancelled 0.9% 6
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
10Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 19 | 73.7% | 1 |
| November 2024 | 17 | 17 | 82.4% | 0 |
| December 2024 | 27 | 27 | 70.4% | 0 |
| January 2025 | 30 | 30 | 76.7% | 0 |
| February 2025 | 28 | 28 | 89.3% | 0 |
| March 2025 | 25 | 25 | 80.0% | 0 |
| April 2025 | 28 | 27 | 85.2% | 1 |
| May 2025 | 31 | 31 | 93.6% | 0 |
| June 2025 | 28 | 28 | 82.1% | 0 |
| July 2025 | 32 | 32 | 96.9% | 0 |
| August 2025 | 49 | 49 | 69.4% | 0 |
| September 2025 | 55 | 55 | 80.0% | 0 |
| October 2025 | 30 | 30 | 100.0% | 0 |
| November 2025 | 28 | 27 | 85.2% | 1 |
| December 2025 | 29 | 28 | 82.1% | 1 |
| January 2026 | 30 | 29 | 89.7% | 1 |
| February 2026 | 28 | 27 | 92.6% | 1 |
| March 2026 | 30 | 30 | 70.0% | 0 |
| April 2026 | 40 | 40 | 65.0% | 0 |
| May 2026 | 44 | 44 | 77.3% | 0 |
| June 2026 | 31 | 31 | 61.3% | 0 |
| July 2026 | 32 | 32 | 59.4% | 0 |