WN856
WN856 (Southwest Airlines) is a multi-stop service on 36 routes, busiest Denver to Ontario. Of 732 departures recorded from October 2024 to July 2026, 83.5% left on time, according to the US BTS.
- On-time departures83.5%of 732 flights
- Average delay6.6 min
- July 202635▲ 12.9%vs July 2025
- Cancelled1.0%
- Legs flown under this number36
according to the US BTS · Oct 12, 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 | 35 | 72 | ▲ 105.7% |
| February | 41 | 67 | ▲ 63.4% |
| March | 29 | 44 | ▲ 51.7% |
| April | 26 | 31 | ▲ 19.2% |
| May | 26 | 30 | ▲ 15.4% |
| June | 30 | 34 | ▲ 13.3% |
| July | 31 | 35 | ▲ 12.9% |
| August | 12 | – | – |
| September | 8 | – | – |
| October | 34 | – | in progress |
| November | 32 | – | – |
| December | 29 | – | – |
| Year to date (Jan–Jul) | 218 | 313 | ▲ 43.6% |
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 | 85.7% | 82.6% | ▼ 3.6% |
| February | 78.1% | 74.6% | ▼ 4.4% |
| March | 96.6% | 83.3% | ▼ 13.7% |
| April | 84.0% | 90.3% | ▲ 7.5% |
| May | 73.1% | 100.0% | ▲ 36.8% |
| June | 93.3% | 67.7% | ▼ 27.5% |
| July | 93.6% | 79.4% | ▼ 15.1% |
| August | 83.3% | – | – |
| September | 75.0% | – | – |
| October | 94.1% | – | in progress |
| November | 81.3% | – | – |
| December | 75.9% | – | – |
| Year-to-date average (Jan–Jul) | 86.3% | 82.6% | ▼ 4.4% |
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 | 3 | – |
| February | 0 | 0 | – |
| March | 0 | 2 | – |
| April | 1 | 0 | ▼ 100.0% |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 1 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 1 | 6 | ▲ 500.0% |
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 99.0% 725
- Cancelled 1.0% 7
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
99 of 9
| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| DEN ONT Denver International Airport – Ontario International Airport | 1,316 | 5.3 min | 85.1% | 94 |
| TUL HOU Tulsa International Airport – William P. Hobby Airport | 731 | -0.2 min | 93.4% | 61 |
| MAF DAL Midland International Air and Space Port – Dallas Love Field | 513 | -1.4 min | 96.5% | 57 |
| MCO AUS Orlando International Airport – Austin Bergstrom International Airport | 1,596 | 7.0 min | 82.0% | 50 |
| PNS DAL Pensacola International Airport – Dallas Love Field | 951 | 7.5 min | 91.5% | 47 |
| BWI BOS Baltimore/Washington International Thurgood Marshall Airport – Boston Logan International Airport | 594 | 11.0 min | 75.0% | 44 |
| MDW PVD Chicago Midway International Airport – Rhode Island T. F. Green International Airport | 1,352 | 18.4 min | 68.3% | 42 |
| BUR SJC Hollywood Burbank/Bob Hope Airport – Mineta San Jose International Airport | 477 | 7.5 min | 83.9% | 33 |
| BNA PNS Nashville International Airport – Pensacola International Airport | 630 | 2.1 min | 84.4% | 33 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 90.0% | 0 |
| November 2024 | 29 | 29 | 86.2% | 0 |
| December 2024 | 37 | 37 | 78.4% | 0 |
| January 2025 | 35 | 35 | 85.7% | 0 |
| February 2025 | 41 | 41 | 78.1% | 0 |
| March 2025 | 29 | 29 | 96.6% | 0 |
| April 2025 | 26 | 25 | 84.0% | 1 |
| May 2025 | 26 | 26 | 73.1% | 0 |
| June 2025 | 30 | 30 | 93.3% | 0 |
| July 2025 | 31 | 31 | 93.6% | 0 |
| August 2025 | 12 | 12 | 83.3% | 0 |
| September 2025 | 8 | 8 | 75.0% | 0 |
| October 2025 | 34 | 34 | 94.1% | 0 |
| November 2025 | 32 | 32 | 81.3% | 0 |
| December 2025 | 29 | 29 | 75.9% | 0 |
| January 2026 | 72 | 69 | 82.6% | 3 |
| February 2026 | 67 | 67 | 74.6% | 0 |
| March 2026 | 44 | 42 | 83.3% | 2 |
| April 2026 | 31 | 31 | 90.3% | 0 |
| May 2026 | 30 | 30 | 100.0% | 0 |
| June 2026 | 34 | 34 | 67.7% | 0 |
| July 2026 | 35 | 34 | 79.4% | 1 |