WN3812
WN3812 (Southwest Airlines) is a multi-stop service on 22 routes, busiest Chicago to Washington. Of 532 departures recorded from October 2024 to July 2026, 68.4% left on time, according to the US BTS.
- On-time departures68.4%of 532 flights
- Average delay15.7 min
- July 202616▼ 48.4%vs July 2025
- Cancelled1.1%
- Legs flown under this number22
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 | 9 | 5 | ▼ 44.4% |
| February | 7 | 3 | ▼ 57.1% |
| March | 5 | 23 | ▲ 360.0% |
| April | 53 | 34 | ▼ 35.8% |
| May | 70 | 33 | ▼ 52.9% |
| June | 35 | 20 | ▼ 42.9% |
| July | 31 | 16 | ▼ 48.4% |
| August | 39 | – | – |
| September | 39 | – | – |
| October | 2 | – | in progress |
| November | 25 | – | – |
| December | 29 | – | – |
| Year to date (Jan–Jul) | 210 | 134 | ▼ 36.2% |
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 | 66.7% | 100.0% | ▲ 50.0% |
| February | 100.0% | 66.7% | ▼ 33.3% |
| March | 80.0% | 90.0% | ▲ 12.5% |
| April | 71.7% | 50.0% | ▼ 30.3% |
| May | 67.1% | 30.3% | ▼ 54.9% |
| June | 57.1% | 55.0% | ▼ 3.7% |
| July | 55.2% | 68.8% | ▲ 24.6% |
| August | 82.1% | – | – |
| September | 74.4% | – | – |
| October | 100.0% | – | in progress |
| November | 91.7% | – | – |
| December | 79.3% | – | – |
| Year-to-date average (Jan–Jul) | 71.1% | 65.8% | ▼ 7.5% |
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 | 0 | 3 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 2 | 0 | ▼ 100.0% |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 1 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 2 | 3 | ▲ 50.0% |
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 98.9% 526
- Cancelled 1.1% 6
Share of all recorded flights in the period, all legs. · Oct 12, 2024 → Jul 29, 2026
On time, leg by leg
Departures within 15 minutes of schedule; small figure = departures recorded.
Legs flown under this number
5| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| MDW DCA Chicago Midway International Airport – Ronald Reagan Washington National Airport | 964 | 28.8 min | 50.9% | 61 |
| MKE DCA General Mitchell International Airport – Ronald Reagan Washington National Airport | 1,019 | 5.4 min | 86.2% | 59 |
| STL BOS St. Louis Lambert International Airport – Boston Logan International Airport | 1,680 | 15.6 min | 77.6% | 58 |
| BUF TPA Buffalo Niagara International Airport – Tampa International Airport | 1,699 | 16.5 min | 68.4% | 57 |
| PHX LGB Phoenix Sky Harbor International Airport – Long Beach International Airport | 570 | 25.0 min | 34.7% | 49 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 70.0% | 0 |
| November 2024 | 19 | 19 | 89.5% | 0 |
| December 2024 | 15 | 15 | 60.0% | 0 |
| January 2025 | 9 | 9 | 66.7% | 0 |
| February 2025 | 7 | 7 | 100.0% | 0 |
| March 2025 | 5 | 5 | 80.0% | 0 |
| April 2025 | 53 | 53 | 71.7% | 0 |
| May 2025 | 70 | 70 | 67.1% | 0 |
| June 2025 | 35 | 35 | 57.1% | 0 |
| July 2025 | 31 | 29 | 55.2% | 2 |
| August 2025 | 39 | 39 | 82.1% | 0 |
| September 2025 | 39 | 39 | 74.4% | 0 |
| October 2025 | 2 | 2 | 100.0% | 0 |
| November 2025 | 25 | 24 | 91.7% | 1 |
| December 2025 | 29 | 29 | 79.3% | 0 |
| January 2026 | 5 | 5 | 100.0% | 0 |
| February 2026 | 3 | 3 | 66.7% | 0 |
| March 2026 | 23 | 20 | 90.0% | 3 |
| April 2026 | 34 | 34 | 50.0% | 0 |
| May 2026 | 33 | 33 | 30.3% | 0 |
| June 2026 | 20 | 20 | 55.0% | 0 |
| July 2026 | 16 | 16 | 68.8% | 0 |