WN857
WN857 (Southwest Airlines) is a multi-stop service on 48 routes, busiest Grand Rapids to Denver. Of 927 departures recorded from October 2024 to July 2026, 76.5% left on time, according to the US BTS.
- On-time departures76.5%of 927 flights
- Average delay12.7 min
- July 202631▼ 38.0%vs July 2025
- Cancelled0.4%
- Legs flown under this number48
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 | 58 | 31 | ▼ 46.6% |
| February | 49 | 56 | ▲ 14.3% |
| March | 30 | 39 | ▲ 30.0% |
| April | 41 | 41 | 0.0% |
| May | 48 | 44 | ▼ 8.3% |
| June | 53 | 31 | ▼ 41.5% |
| July | 50 | 31 | ▼ 38.0% |
| August | 35 | – | – |
| September | 30 | – | – |
| October | 53 | – | in progress |
| November | 36 | – | – |
| December | 23 | – | – |
| Year to date (Jan–Jul) | 329 | 273 | ▼ 17.0% |
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 | 72.4% | 83.9% | ▲ 15.8% |
| February | 77.6% | 85.7% | ▲ 10.5% |
| March | 93.3% | 97.4% | ▲ 4.4% |
| April | 95.1% | 63.4% | ▼ 33.3% |
| May | 72.9% | 25.6% | ▼ 64.9% |
| June | 73.6% | 77.4% | ▲ 5.2% |
| July | 64.0% | 83.9% | ▲ 31.0% |
| August | 88.6% | – | – |
| September | 96.7% | – | – |
| October | 69.8% | – | in progress |
| November | 75.0% | – | – |
| December | 60.9% | – | – |
| Year-to-date average (Jan–Jul) | 78.4% | 73.9% | ▼ 5.8% |
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 | 0 | – |
| February | 0 | 0 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 1 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 0 | 1 |
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 99.6% 923
- Cancelled 0.4% 4
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
12Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 35 | 33 | 84.9% | 2 |
| November 2024 | 62 | 61 | 83.6% | 1 |
| December 2024 | 51 | 51 | 72.6% | 0 |
| January 2025 | 58 | 58 | 72.4% | 0 |
| February 2025 | 49 | 49 | 77.6% | 0 |
| March 2025 | 30 | 30 | 93.3% | 0 |
| April 2025 | 41 | 41 | 95.1% | 0 |
| May 2025 | 48 | 48 | 72.9% | 0 |
| June 2025 | 53 | 53 | 73.6% | 0 |
| July 2025 | 50 | 50 | 64.0% | 0 |
| August 2025 | 35 | 35 | 88.6% | 0 |
| September 2025 | 30 | 30 | 96.7% | 0 |
| October 2025 | 53 | 53 | 69.8% | 0 |
| November 2025 | 36 | 36 | 75.0% | 0 |
| December 2025 | 23 | 23 | 60.9% | 0 |
| January 2026 | 31 | 31 | 83.9% | 0 |
| February 2026 | 56 | 56 | 85.7% | 0 |
| March 2026 | 39 | 39 | 97.4% | 0 |
| April 2026 | 41 | 41 | 63.4% | 0 |
| May 2026 | 44 | 43 | 25.6% | 1 |
| June 2026 | 31 | 31 | 77.4% | 0 |
| July 2026 | 31 | 31 | 83.9% | 0 |