WN4858
WN4858 (Southwest Airlines) is a multi-stop service on 13 routes, busiest Oakland to Boise. Of 139 departures recorded from October 2024 to July 2026, 72.5% left on time, according to the US BTS.
- On-time departures72.5%of 139 flights
- Average delay13.5 min
- July 202614
- Cancelled0.7%
- Legs flown under this number13
Recorded departures by month
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods12 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 25 | 3 | ▼ 88.0% |
| February | 36 | 3 | ▼ 91.7% |
| March | 6 | – | – |
| April | 4 | – | – |
| May | 4 | – | – |
| June | 1 | 12 | ▲ 1,100.0% |
| July | – | 14 | – |
| August | – | – | – |
| September | – | – | – |
| October | – | – | in progress |
| November | 5 | – | – |
| 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 periods12 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 100.0% | 100.0% | 0.0% |
| February | 94.3% | 33.3% | ▼ 64.7% |
| March | 100.0% | – | – |
| April | 100.0% | – | – |
| May | 75.0% | – | – |
| June | 100.0% | 8.3% | ▼ 91.7% |
| July | – | 35.7% | – |
| August | – | – | – |
| September | – | – | – |
| October | – | – | in progress |
| November | 20.0% | – | – |
| December | 36.4% | – | – |
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 periods12 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 0 | – |
| February | 1 | 0 | ▼ 100.0% |
| March | 0 | – | – |
| April | 0 | – | – |
| May | 0 | – | – |
| June | 0 | 0 | – |
| July | – | 0 | – |
| August | – | – | – |
| 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 99.3% 138
- Cancelled 0.7% 1
Share of all recorded flights in the period, all legs. · Oct 13, 2024 → Jul 31, 2026
Legs flown under this number
1| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| OAK BOI Oakland San Francisco Bay Airport – Boise Air Terminal/Gowen Field | 823 | -3.1 min | 98.0% | 50 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 10 | 10 | 80.0% | 0 |
| November 2024 | 3 | 3 | 100.0% | 0 |
| December 2024 | 2 | 2 | 100.0% | 0 |
| January 2025 | 25 | 25 | 100.0% | 0 |
| February 2025 | 36 | 35 | 94.3% | 1 |
| March 2025 | 6 | 6 | 100.0% | 0 |
| April 2025 | 4 | 4 | 100.0% | 0 |
| May 2025 | 4 | 4 | 75.0% | 0 |
| June 2025 | 1 | 1 | 100.0% | 0 |
| November 2025 | 5 | 5 | 20.0% | 0 |
| December 2025 | 11 | 11 | 36.4% | 0 |
| January 2026 | 3 | 3 | 100.0% | 0 |
| February 2026 | 3 | 3 | 33.3% | 0 |
| June 2026 | 12 | 12 | 8.3% | 0 |
| July 2026 | 14 | 14 | 35.7% | 0 |