WN3427
WN3427 (Southwest Airlines) is a multi-stop service on 25 routes, busiest Denver to Tucson. Of 445 departures recorded from October 2024 to July 2026, 74.8% left on time, according to the US BTS.
- On-time departures74.8%of 445 flights
- Average delay12.0 min
- July 20269▲ 125.0%vs July 2025
- Cancelled0.9%
- Legs flown under this number25
Recorded departures by month
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 | 63 | 2 | ▼ 96.8% |
| February | 36 | 4 | ▼ 88.9% |
| March | 52 | 37 | ▼ 28.8% |
| April | 15 | 10 | ▼ 33.3% |
| May | 5 | 6 | ▲ 20.0% |
| June | 4 | 7 | ▲ 75.0% |
| July | 4 | 9 | ▲ 125.0% |
| August | 17 | – | – |
| September | 17 | – | – |
| October | 31 | – | in progress |
| November | 14 | – | – |
| December | 18 | – | – |
| Year to date (Jan–Jul) | 179 | 75 | ▼ 58.1% |
according to the US BTS · October 2024 → July 2026
On-time departures by month
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 | 77.8% | 50.0% | ▼ 35.7% |
| February | 61.1% | 75.0% | ▲ 22.7% |
| March | 76.5% | 56.8% | ▼ 25.8% |
| April | 93.3% | 70.0% | ▼ 25.0% |
| May | 100.0% | 66.7% | ▼ 33.3% |
| June | 100.0% | 85.7% | ▼ 14.3% |
| July | 75.0% | 88.9% | ▲ 18.5% |
| August | 82.4% | – | – |
| September | 94.1% | – | – |
| October | 100.0% | – | in progress |
| November | 42.9% | – | – |
| December | 35.3% | – | – |
| Year-to-date average (Jan–Jul) | 83.4% | 70.4% | ▼ 15.5% |
according to the US BTS · October 2024 → July 2026
Average departure delay by month
according to the US BTS · October 2024 → July 2026
Cancelled departures by month
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 | 0 | – | – |
| December | 1 | – | – |
| Year to date (Jan–Jul) | 1 | 0 | ▼ 100.0% |
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 99.1% 441
- Cancelled 0.9% 4
Share of all recorded flights in the period, all legs. · Oct 13, 2024 → Jul 29, 2026
On time, leg by leg
Departures within 15 minutes of schedule; small figure = departures recorded.
Legs flown under this number
4| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| DEN TUS Denver International Airport – Tucson International Airport | 1,029 | 9.5 min | 75.6% | 91 |
| TUS HOU Tucson International Airport – William P. Hobby Airport | 1,518 | 6.6 min | 82.9% | 36 |
| BUR DEN Hollywood Burbank/Bob Hope Airport – Denver International Airport | 1,366 | 7.7 min | 88.2% | 34 |
| LAX STL Los Angeles International Airport – St. Louis Lambert International Airport | 2,557 | 0.3 min | 100.0% | 31 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 11 | 11 | 63.6% | 0 |
| November 2024 | 44 | 42 | 81.0% | 2 |
| December 2024 | 39 | 39 | 76.9% | 0 |
| January 2025 | 63 | 63 | 77.8% | 0 |
| February 2025 | 36 | 36 | 61.1% | 0 |
| March 2025 | 52 | 51 | 76.5% | 1 |
| April 2025 | 15 | 15 | 93.3% | 0 |
| May 2025 | 5 | 5 | 100.0% | 0 |
| June 2025 | 4 | 4 | 100.0% | 0 |
| July 2025 | 4 | 4 | 75.0% | 0 |
| August 2025 | 17 | 17 | 82.4% | 0 |
| September 2025 | 17 | 17 | 94.1% | 0 |
| October 2025 | 31 | 31 | 100.0% | 0 |
| November 2025 | 14 | 14 | 42.9% | 0 |
| December 2025 | 18 | 17 | 35.3% | 1 |
| January 2026 | 2 | 2 | 50.0% | 0 |
| February 2026 | 4 | 4 | 75.0% | 0 |
| March 2026 | 37 | 37 | 56.8% | 0 |
| April 2026 | 10 | 10 | 70.0% | 0 |
| May 2026 | 6 | 6 | 66.7% | 0 |
| June 2026 | 7 | 7 | 85.7% | 0 |
| July 2026 | 9 | 9 | 88.9% | 0 |