WN4530
WN4530 (Southwest Airlines) is a multi-stop service on 21 routes, busiest San Jose to Denver. Of 405 departures recorded from October 2024 to July 2026, 74.4% left on time, according to the US BTS.
- On-time departures74.4%of 405 flights
- Average delay13.1 min
- July 202621▲ 162.5%vs July 2025
- Cancelled0.7%
- Legs flown under this number21
Recorded departures by month
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods18 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 1 | 34 | ▲ 3,300.0% |
| February | – | 60 | – |
| March | 26 | 35 | ▲ 34.6% |
| April | 16 | 27 | ▲ 68.8% |
| May | 14 | 26 | ▲ 85.7% |
| June | 9 | 19 | ▲ 111.1% |
| July | 8 | 21 | ▲ 162.5% |
| August | 5 | – | – |
| September | 4 | – | – |
| October | 13 | – | in progress |
| November | 28 | – | – |
| December | 31 | – | – |
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 periods18 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 100.0% | 73.5% | ▼ 26.5% |
| February | – | 61.0% | – |
| March | 100.0% | 60.6% | ▼ 39.4% |
| April | 81.3% | 92.6% | ▲ 14.0% |
| May | 71.4% | 96.2% | ▲ 34.6% |
| June | 77.8% | 36.8% | ▼ 52.6% |
| July | 75.0% | 42.9% | ▼ 42.9% |
| August | 100.0% | – | – |
| September | 100.0% | – | – |
| October | 69.2% | – | in progress |
| November | 75.0% | – | – |
| December | 77.4% | – | – |
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 periods18 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 0 | – |
| February | – | 1 | – |
| March | 0 | 2 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| 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 99.3% 402
- Cancelled 0.7% 3
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
6| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| SJC DEN Mineta San Jose International Airport – Denver International Airport | 1,522 | 14.8 min | 76.6% | 64 |
| DEN SJC Denver International Airport – Mineta San Jose International Airport | 1,522 | 16.9 min | 66.0% | 53 |
| TPA AUS Tampa International Airport – Austin Bergstrom International Airport | 1,490 | -2.9 min | 98.0% | 50 |
| BNA RIC Nashville International Airport – Richmond International Airport | 847 | 28.0 min | 29.4% | 34 |
| SRQ PIT Sarasota Bradenton International Airport – Pittsburgh International Airport | 1,472 | 28.3 min | 58.1% | 33 |
| OAK LAX Oakland San Francisco Bay Airport – Los Angeles International Airport | 543 | -1.5 min | 100.0% | 33 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 10 | 10 | 90.0% | 0 |
| November 2024 | 13 | 13 | 100.0% | 0 |
| December 2024 | 5 | 5 | 80.0% | 0 |
| January 2025 | 1 | 1 | 100.0% | 0 |
| March 2025 | 26 | 26 | 100.0% | 0 |
| April 2025 | 16 | 16 | 81.3% | 0 |
| May 2025 | 14 | 14 | 71.4% | 0 |
| June 2025 | 9 | 9 | 77.8% | 0 |
| July 2025 | 8 | 8 | 75.0% | 0 |
| August 2025 | 5 | 5 | 100.0% | 0 |
| September 2025 | 4 | 4 | 100.0% | 0 |
| October 2025 | 13 | 13 | 69.2% | 0 |
| November 2025 | 28 | 28 | 75.0% | 0 |
| December 2025 | 31 | 31 | 77.4% | 0 |
| January 2026 | 34 | 34 | 73.5% | 0 |
| February 2026 | 60 | 59 | 61.0% | 1 |
| March 2026 | 35 | 33 | 60.6% | 2 |
| April 2026 | 27 | 27 | 92.6% | 0 |
| May 2026 | 26 | 26 | 96.2% | 0 |
| June 2026 | 19 | 19 | 36.8% | 0 |
| July 2026 | 21 | 21 | 42.9% | 0 |