WN4820
WN4820 (Southwest Airlines) is a multi-stop service on 15 routes, busiest Denver to San Jose. Of 255 departures recorded from October 2024 to July 2026, 67.5% left on time, according to the US BTS.
- On-time departures67.5%of 255 flights
- Average delay18.7 min
- July 202627▲ 3.8%vs July 2025
- Cancelled1.2%
- Legs flown under this number15
Recorded departures by month
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods14 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 9 | 10 | ▲ 11.1% |
| February | 15 | 8 | ▼ 46.7% |
| March | 24 | 2 | ▼ 91.7% |
| April | 6 | – | – |
| May | – | – | – |
| June | 22 | 23 | ▲ 4.5% |
| July | 26 | 27 | ▲ 3.8% |
| August | 3 | – | – |
| September | – | – | – |
| October | – | – | in progress |
| November | 2 | – | – |
| December | 9 | – | – |
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 periods14 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 88.9% | 90.0% | ▲ 1.2% |
| February | 93.3% | 75.0% | ▼ 19.6% |
| March | 73.9% | 100.0% | ▲ 35.3% |
| April | 60.0% | – | – |
| May | – | – | – |
| June | 36.4% | 43.5% | ▲ 19.6% |
| July | 36.0% | 63.0% | ▲ 74.9% |
| August | 33.3% | – | – |
| September | – | – | – |
| October | – | – | in progress |
| November | 50.0% | – | – |
| December | 0.0% | – | – |
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 periods14 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 0 | – |
| February | 0 | 0 | – |
| March | 1 | 0 | ▼ 100.0% |
| April | 1 | – | – |
| May | – | – | – |
| June | 0 | 0 | – |
| July | 1 | 0 | ▼ 100.0% |
| August | 0 | – | – |
| 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 98.8% 252
- Cancelled 1.2% 3
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 |
|---|---|---|---|---|
| DEN SJC Denver International Airport – Mineta San Jose International Airport | 1,522 | 42.0 min | 36.0% | 51 |
| BNA RDU Nashville International Airport – Raleigh-Durham International Airport | 710 | 27.4 min | 54.0% | 50 |
| TPA BNA Tampa International Airport – Nashville International Airport | 987 | 1.2 min | 95.7% | 46 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 9 | 9 | 88.9% | 0 |
| November 2024 | 35 | 35 | 97.1% | 0 |
| December 2024 | 25 | 25 | 92.0% | 0 |
| January 2025 | 9 | 9 | 88.9% | 0 |
| February 2025 | 15 | 15 | 93.3% | 0 |
| March 2025 | 24 | 23 | 73.9% | 1 |
| April 2025 | 6 | 5 | 60.0% | 1 |
| June 2025 | 22 | 22 | 36.4% | 0 |
| July 2025 | 26 | 25 | 36.0% | 1 |
| August 2025 | 3 | 3 | 33.3% | 0 |
| November 2025 | 2 | 2 | 50.0% | 0 |
| December 2025 | 9 | 9 | 0.0% | 0 |
| January 2026 | 10 | 10 | 90.0% | 0 |
| February 2026 | 8 | 8 | 75.0% | 0 |
| March 2026 | 2 | 2 | 100.0% | 0 |
| June 2026 | 23 | 23 | 43.5% | 0 |
| July 2026 | 27 | 27 | 63.0% | 0 |