WN4198
WN4198 (Southwest Airlines) is a multi-stop service on 34 routes, busiest San Diego to Oakland. Of 601 departures recorded from October 2024 to July 2026, 80.5% left on time, according to the US BTS.
- On-time departures80.5%of 601 flights
- Average delay8.8 min
- July 202645▲ 95.7%vs July 2025
- Cancelled0.3%
- Legs flown under this number34
according to the US BTS · Oct 13, 2024 → Jul 31, 2026 domestic flights only
Recorded departures by month
Partial coverage: domestic flights only · 22 of 22 periods have data
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 | 31 | 38 | ▲ 22.6% |
| February | 22 | 43 | ▲ 95.5% |
| March | 24 | 24 | 0.0% |
| April | 8 | 20 | ▲ 150.0% |
| May | 6 | 22 | ▲ 266.7% |
| June | 18 | 40 | ▲ 122.2% |
| July | 23 | 45 | ▲ 95.7% |
| August | 24 | – | – |
| September | 25 | – | – |
| October | 12 | – | in progress |
| November | 37 | – | – |
| December | 30 | – | – |
| Year to date (Jan–Jul) | 132 | 232 | ▲ 75.8% |
according to the US BTS · October 2024 → July 2026
On-time departures by month
Partial coverage: domestic flights only · 22 of 22 periods have data
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 | 80.7% | 84.2% | ▲ 4.4% |
| February | 90.9% | 83.7% | ▼ 7.9% |
| March | 91.3% | 66.7% | ▼ 27.0% |
| April | 75.0% | 60.0% | ▼ 20.0% |
| May | 66.7% | 86.4% | ▲ 29.5% |
| June | 100.0% | 77.5% | ▼ 22.5% |
| July | 95.7% | 73.3% | ▼ 23.3% |
| August | 62.5% | – | – |
| September | 76.0% | – | – |
| October | 83.3% | – | in progress |
| November | 80.6% | – | – |
| December | 70.0% | – | – |
| Year-to-date average (Jan–Jul) | 85.7% | 76.0% | ▼ 11.4% |
according to the US BTS · October 2024 → July 2026
Average departure delay by month
Partial coverage: domestic flights only · 22 of 22 periods have data
according to the US BTS · October 2024 → July 2026
Cancelled departures by month
Partial coverage: domestic flights only · 22 of 22 periods have data
The most recent periods19 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 0 | – |
| February | 0 | 0 | – |
| March | 1 | 0 | ▼ 100.0% |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 1 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 1 | 0 | ▼ 100.0% |
according to the US BTS · October 2024 → July 2026
This is not a forecast
This is a historical record of departures already flown, not a forecast for your flight.
This number flies several legs
Several legs: the headline figure averages all of them. See the leg table.
Cancellation share
- Not cancelled 99.7% 599
- Cancelled 0.3% 2
Share of all recorded flights in the period, all legs. · Oct 13, 2024 → Jul 31, 2026
On time, leg by leg
Departures within 15 minutes of schedule; small figure = departures recorded.
Legs flown under this number
88 of 8
| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| SAN OAK San Diego International Airport – Oakland San Francisco Bay Airport | 718 | 9.5 min | 78.4% | 74 |
| ONT SMF Ontario International Airport – Sacramento International Airport | 627 | 0.7 min | 90.4% | 73 |
| SLC PHX Salt Lake City International Airport – Phoenix Sky Harbor International Airport | 818 | -2.1 min | 97.7% | 43 |
| LAS HOU Harry Reid International Airport – William P. Hobby Airport | 1,985 | 10.1 min | 78.6% | 42 |
| OAK SLC Oakland San Francisco Bay Airport – Salt Lake City International Airport | 945 | 10.1 min | 64.3% | 42 |
| SEA MDW Seattle–Tacoma International Airport – Chicago Midway International Airport | 2,782 | 8.6 min | 74.4% | 39 |
| CMH MDW John Glenn Columbus International Airport – Chicago Midway International Airport | 454 | 16.2 min | 85.7% | 35 |
| SJC LAS Mineta San Jose International Airport – Harry Reid International Airport | 620 | -0.9 min | 96.7% | 30 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 9 | 9 | 88.9% | 0 |
| November 2024 | 46 | 46 | 82.6% | 0 |
| December 2024 | 54 | 54 | 87.0% | 0 |
| January 2025 | 31 | 31 | 80.7% | 0 |
| February 2025 | 22 | 22 | 90.9% | 0 |
| March 2025 | 24 | 23 | 91.3% | 1 |
| April 2025 | 8 | 8 | 75.0% | 0 |
| May 2025 | 6 | 6 | 66.7% | 0 |
| June 2025 | 18 | 18 | 100.0% | 0 |
| July 2025 | 23 | 23 | 95.7% | 0 |
| August 2025 | 24 | 24 | 62.5% | 0 |
| September 2025 | 25 | 25 | 76.0% | 0 |
| October 2025 | 12 | 12 | 83.3% | 0 |
| November 2025 | 37 | 36 | 80.6% | 1 |
| December 2025 | 30 | 30 | 70.0% | 0 |
| January 2026 | 38 | 38 | 84.2% | 0 |
| February 2026 | 43 | 43 | 83.7% | 0 |
| March 2026 | 24 | 24 | 66.7% | 0 |
| April 2026 | 20 | 20 | 60.0% | 0 |
| May 2026 | 22 | 22 | 86.4% | 0 |
| June 2026 | 40 | 40 | 77.5% | 0 |
| July 2026 | 45 | 45 | 73.3% | 0 |