WN3179
WN3179 (Southwest Airlines) is a multi-stop service on 25 routes, busiest Dulles to Denver. Of 442 departures recorded from October 2024 to July 2026, 79.3% left on time, according to the US BTS.
- On-time departures79.3%of 442 flights
- Average delay12.0 min
- July 202627▼ 10.0%vs July 2025
- Cancelled0.5%
- 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 | 2 | 28 | ▲ 1,300.0% |
| February | 2 | 18 | ▲ 800.0% |
| March | 27 | 41 | ▲ 51.9% |
| April | 30 | 14 | ▼ 53.3% |
| May | 31 | 10 | ▼ 67.7% |
| June | 30 | 23 | ▼ 23.3% |
| July | 30 | 27 | ▼ 10.0% |
| August | 16 | – | – |
| September | 13 | – | – |
| October | 31 | – | in progress |
| November | 14 | – | – |
| December | 16 | – | – |
| Year to date (Jan–Jul) | 152 | 161 | ▲ 5.9% |
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 | 100.0% | 85.7% | ▼ 14.3% |
| February | 50.0% | 83.3% | ▲ 66.7% |
| March | 88.9% | 60.0% | ▼ 32.5% |
| April | 76.7% | 92.9% | ▲ 21.1% |
| May | 87.1% | 90.0% | ▲ 3.3% |
| June | 80.0% | 73.9% | ▼ 7.6% |
| July | 86.2% | 88.9% | ▲ 3.1% |
| August | 75.0% | – | – |
| September | 100.0% | – | – |
| October | 87.1% | – | in progress |
| November | 50.0% | – | – |
| December | 75.0% | – | – |
| Year-to-date average (Jan–Jul) | 81.3% | 82.1% | ▲ 1.0% |
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 | 0 | 1 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 1 | 0 | ▼ 100.0% |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 1 | 1 | 0.0% |
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 99.5% 440
- Cancelled 0.5% 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
6| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| IAD DEN Washington Dulles International Airport – Denver International Airport | 2,332 | 13.9 min | 81.4% | 60 |
| DEN HOU Denver International Airport – William P. Hobby Airport | 1,422 | 11.7 min | 81.0% | 58 |
| LAS RNO Harry Reid International Airport – Reno Tahoe International Airport | 556 | 6.7 min | 82.0% | 50 |
| LAX LAS Los Angeles International Airport – Harry Reid International Airport | 380 | 2.5 min | 88.1% | 42 |
| SRQ BWI Sarasota Bradenton International Airport – Baltimore/Washington International Thurgood Marshall Airport | 1,419 | 11.7 min | 68.8% | 33 |
| KOA OGG Ellison Onizuka Kona International Airport at Keāhole – Kahului International Airport | 135 | 14.2 min | 87.1% | 31 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 27 | 27 | 74.1% | 0 |
| November 2024 | 4 | 4 | 75.0% | 0 |
| December 2024 | 8 | 8 | 37.5% | 0 |
| January 2025 | 2 | 2 | 100.0% | 0 |
| February 2025 | 2 | 2 | 50.0% | 0 |
| March 2025 | 27 | 27 | 88.9% | 0 |
| April 2025 | 30 | 30 | 76.7% | 0 |
| May 2025 | 31 | 31 | 87.1% | 0 |
| June 2025 | 30 | 30 | 80.0% | 0 |
| July 2025 | 30 | 29 | 86.2% | 1 |
| August 2025 | 16 | 16 | 75.0% | 0 |
| September 2025 | 13 | 13 | 100.0% | 0 |
| October 2025 | 31 | 31 | 87.1% | 0 |
| November 2025 | 14 | 14 | 50.0% | 0 |
| December 2025 | 16 | 16 | 75.0% | 0 |
| January 2026 | 28 | 28 | 85.7% | 0 |
| February 2026 | 18 | 18 | 83.3% | 0 |
| March 2026 | 41 | 40 | 60.0% | 1 |
| April 2026 | 14 | 14 | 92.9% | 0 |
| May 2026 | 10 | 10 | 90.0% | 0 |
| June 2026 | 23 | 23 | 73.9% | 0 |
| July 2026 | 27 | 27 | 88.9% | 0 |