WN858
WN858 (Southwest Airlines) is a multi-stop service on 29 routes, busiest Portland to Baltimore. Of 639 departures recorded from October 2024 to July 2026, 74.9% left on time, according to the US BTS.
- On-time departures74.9%of 639 flights
- Average delay14.9 min
- July 202631▼ 3.1%vs July 2025
- Cancelled1.4%
- Legs flown under this number29
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 | 27 | 33 | ▲ 22.2% |
| February | 24 | 28 | ▲ 16.7% |
| March | 30 | 31 | ▲ 3.3% |
| April | 30 | 30 | 0.0% |
| May | 31 | 31 | 0.0% |
| June | 30 | 30 | 0.0% |
| July | 32 | 31 | ▼ 3.1% |
| August | 27 | – | – |
| September | 25 | – | – |
| October | 35 | – | in progress |
| November | 31 | – | – |
| December | 40 | – | – |
| Year to date (Jan–Jul) | 204 | 214 | ▲ 4.9% |
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 | 88.9% | 96.9% | ▲ 9.0% |
| February | 66.7% | 92.9% | ▲ 39.3% |
| March | 93.3% | 46.7% | ▼ 50.0% |
| April | 100.0% | 76.7% | ▼ 23.3% |
| May | 96.8% | 48.4% | ▼ 50.0% |
| June | 56.7% | 40.0% | ▼ 29.4% |
| July | 62.5% | 42.9% | ▼ 31.4% |
| August | 70.4% | – | – |
| September | 70.8% | – | – |
| October | 65.7% | – | in progress |
| November | 78.6% | – | – |
| December | 85.0% | – | – |
| Year-to-date average (Jan–Jul) | 80.7% | 63.5% | ▼ 21.3% |
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 | 0 | 1 | – |
| February | 0 | 0 | – |
| March | 0 | 1 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 3 | – |
| August | 0 | – | – |
| September | 1 | – | – |
| October | 0 | – | in progress |
| November | 3 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 0 | 5 |
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 98.6% 630
- Cancelled 1.4% 9
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
9Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 19 | 19 | 89.5% | 0 |
| November 2024 | 16 | 16 | 100.0% | 0 |
| December 2024 | 28 | 28 | 92.9% | 0 |
| January 2025 | 27 | 27 | 88.9% | 0 |
| February 2025 | 24 | 24 | 66.7% | 0 |
| March 2025 | 30 | 30 | 93.3% | 0 |
| April 2025 | 30 | 30 | 100.0% | 0 |
| May 2025 | 31 | 31 | 96.8% | 0 |
| June 2025 | 30 | 30 | 56.7% | 0 |
| July 2025 | 32 | 32 | 62.5% | 0 |
| August 2025 | 27 | 27 | 70.4% | 0 |
| September 2025 | 25 | 24 | 70.8% | 1 |
| October 2025 | 35 | 35 | 65.7% | 0 |
| November 2025 | 31 | 28 | 78.6% | 3 |
| December 2025 | 40 | 40 | 85.0% | 0 |
| January 2026 | 33 | 32 | 96.9% | 1 |
| February 2026 | 28 | 28 | 92.9% | 0 |
| March 2026 | 31 | 30 | 46.7% | 1 |
| April 2026 | 30 | 30 | 76.7% | 0 |
| May 2026 | 31 | 31 | 48.4% | 0 |
| June 2026 | 30 | 30 | 40.0% | 0 |
| July 2026 | 31 | 28 | 42.9% | 3 |