WN855
WN855 (Southwest Airlines) is a multi-stop service on 43 routes, busiest Boise to Oakland. Of 765 departures recorded from October 2024 to July 2026, 75.4% left on time, according to the US BTS.
- On-time departures75.4%of 765 flights
- Average delay10.7 min
- July 202634▼ 2.9%vs July 2025
- Cancelled0.5%
- Legs flown under this number43
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 | 25 | ▼ 28.6% |
| February | 47 | 24 | ▼ 48.9% |
| March | 47 | 39 | ▼ 17.0% |
| April | 26 | 35 | ▲ 34.6% |
| May | 24 | 36 | ▲ 50.0% |
| June | 29 | 34 | ▲ 17.2% |
| July | 35 | 34 | ▼ 2.9% |
| August | 31 | – | – |
| September | 30 | – | – |
| October | 56 | – | in progress |
| November | 40 | – | – |
| December | 32 | – | – |
| Year to date (Jan–Jul) | 243 | 227 | ▼ 6.6% |
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 | 64.7% | 75.0% | ▲ 15.9% |
| February | 78.7% | 91.7% | ▲ 16.5% |
| March | 85.1% | 61.5% | ▼ 27.7% |
| April | 65.4% | 80.0% | ▲ 22.4% |
| May | 79.2% | 75.0% | ▼ 5.3% |
| June | 55.2% | 50.0% | ▼ 9.4% |
| July | 71.4% | 44.1% | ▼ 38.2% |
| August | 87.1% | – | – |
| September | 90.0% | – | – |
| October | 73.2% | – | in progress |
| November | 95.0% | – | – |
| December | 93.3% | – | – |
| Year-to-date average (Jan–Jul) | 71.4% | 68.2% | ▼ 4.5% |
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 | 1 | 0.0% |
| February | 0 | 0 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 2 | – | – |
| 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 99.5% 761
- Cancelled 0.5% 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
11Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 80.0% | 0 |
| November 2024 | 39 | 39 | 76.9% | 0 |
| December 2024 | 47 | 47 | 85.1% | 0 |
| January 2025 | 35 | 34 | 64.7% | 1 |
| February 2025 | 47 | 47 | 78.7% | 0 |
| March 2025 | 47 | 47 | 85.1% | 0 |
| April 2025 | 26 | 26 | 65.4% | 0 |
| May 2025 | 24 | 24 | 79.2% | 0 |
| June 2025 | 29 | 29 | 55.2% | 0 |
| July 2025 | 35 | 35 | 71.4% | 0 |
| August 2025 | 31 | 31 | 87.1% | 0 |
| September 2025 | 30 | 30 | 90.0% | 0 |
| October 2025 | 56 | 56 | 73.2% | 0 |
| November 2025 | 40 | 40 | 95.0% | 0 |
| December 2025 | 32 | 30 | 93.3% | 2 |
| January 2026 | 25 | 24 | 75.0% | 1 |
| February 2026 | 24 | 24 | 91.7% | 0 |
| March 2026 | 39 | 39 | 61.5% | 0 |
| April 2026 | 35 | 35 | 80.0% | 0 |
| May 2026 | 36 | 36 | 75.0% | 0 |
| June 2026 | 34 | 34 | 50.0% | 0 |
| July 2026 | 34 | 34 | 44.1% | 0 |