WN4603
WN4603 (Southwest Airlines) is a multi-stop service on 12 routes, busiest San Jose to Portland. Of 187 departures recorded from October 2024 to July 2026, 68.7% left on time, according to the US BTS.
- On-time departures68.7%of 187 flights
- Average delay16.6 min
- July 202618
- Cancelled1.1%
- Legs flown under this number12
Recorded departures by month
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods10 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | – | 4 | – |
| February | – | – | – |
| March | 28 | 27 | ▼ 3.6% |
| April | 7 | 6 | ▼ 14.3% |
| May | – | – | – |
| June | – | 16 | – |
| July | – | 18 | – |
| August | – | – | – |
| September | – | – | – |
| October | 24 | – | in progress |
| November | 19 | – | – |
| December | 15 | – | – |
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 periods10 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | – | 100.0% | – |
| February | – | – | – |
| March | 75.0% | 53.9% | ▼ 28.2% |
| April | 71.4% | 83.3% | ▲ 16.7% |
| May | – | – | – |
| June | – | 25.0% | – |
| July | – | 41.2% | – |
| August | – | – | – |
| September | – | – | – |
| October | 87.5% | – | in progress |
| November | 73.7% | – | – |
| December | 100.0% | – | – |
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 periods10 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | – | 0 | – |
| February | – | – | – |
| March | 0 | 1 | – |
| April | 0 | 0 | – |
| May | – | – | – |
| June | – | 0 | – |
| July | – | 1 | – |
| August | – | – | – |
| September | – | – | – |
| October | 0 | – | 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 98.9% 185
- Cancelled 1.1% 2
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
3| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| SJC PDX Mineta San Jose International Airport – Portland International Airport | 916 | 7.2 min | 86.1% | 36 |
| PHX SFO Phoenix Sky Harbor International Airport – San Francisco International Airport | 1,047 | 38.4 min | 33.3% | 34 |
| DAL MDW Dallas Love Field – Chicago Midway International Airport | 1,277 | 21.6 min | 59.4% | 33 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 80.0% | 0 |
| November 2024 | 2 | 2 | 50.0% | 0 |
| December 2024 | 1 | 1 | 0.0% | 0 |
| March 2025 | 28 | 28 | 75.0% | 0 |
| April 2025 | 7 | 7 | 71.4% | 0 |
| October 2025 | 24 | 24 | 87.5% | 0 |
| November 2025 | 19 | 19 | 73.7% | 0 |
| December 2025 | 15 | 15 | 100.0% | 0 |
| January 2026 | 4 | 4 | 100.0% | 0 |
| March 2026 | 27 | 26 | 53.9% | 1 |
| April 2026 | 6 | 6 | 83.3% | 0 |
| June 2026 | 16 | 16 | 25.0% | 0 |
| July 2026 | 18 | 17 | 41.2% | 1 |