WN3643
WN3643 (Southwest Airlines) is a multi-stop service on 20 routes, busiest Chicago to Oakland. Of 428 departures recorded from October 2024 to July 2026, 74.9% left on time, according to the US BTS.
- On-time departures74.9%of 428 flights
- Average delay10.6 min
- July 20269▼ 82.4%vs July 2025
- Cancelled0.2%
- Legs flown under this number20
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 | 1 | 23 | ▲ 2,200.0% |
| February | 8 | 20 | ▲ 150.0% |
| March | 5 | 7 | ▲ 40.0% |
| April | 24 | 31 | ▲ 29.2% |
| May | 31 | 39 | ▲ 25.8% |
| June | 42 | 10 | ▼ 76.2% |
| July | 51 | 9 | ▼ 82.4% |
| August | 34 | – | – |
| September | 35 | – | – |
| October | 22 | – | in progress |
| November | 5 | – | – |
| December | 3 | – | – |
| Year to date (Jan–Jul) | 162 | 139 | ▼ 14.2% |
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 | 100.0% | 91.3% | ▼ 8.7% |
| February | 100.0% | 85.0% | ▼ 15.0% |
| March | 100.0% | 57.1% | ▼ 42.9% |
| April | 83.3% | 51.6% | ▼ 38.1% |
| May | 87.1% | 51.3% | ▼ 41.1% |
| June | 76.2% | 70.0% | ▼ 8.1% |
| July | 64.0% | 88.9% | ▲ 38.9% |
| August | 88.2% | – | – |
| September | 82.9% | – | – |
| October | 63.6% | – | in progress |
| November | 80.0% | – | – |
| December | 66.7% | – | – |
| Year-to-date average (Jan–Jul) | 87.2% | 70.7% | ▼ 18.9% |
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 | 0 | – |
| 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 | 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 99.8% 427
- Cancelled 0.2% 1
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
5| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| MDW OAK Chicago Midway International Airport – Oakland San Francisco Bay Airport | 2,961 | 23.4 min | 55.7% | 61 |
| OAK GEG Oakland San Francisco Bay Airport – Spokane International Airport | 1,165 | 7.7 min | 86.2% | 58 |
| OMA STL Eppley Airfield – St. Louis Lambert International Airport | 549 | 21.2 min | 52.6% | 57 |
| SMF LAS Sacramento International Airport – Harry Reid International Airport | 639 | 1.7 min | 88.9% | 45 |
| MDW ATL Chicago Midway International Airport – Hartsfield Jackson Atlanta International Airport | 952 | 8.1 min | 81.0% | 42 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 10 | 10 | 90.0% | 0 |
| November 2024 | 14 | 14 | 85.7% | 0 |
| December 2024 | 4 | 4 | 50.0% | 0 |
| January 2025 | 1 | 1 | 100.0% | 0 |
| February 2025 | 8 | 8 | 100.0% | 0 |
| March 2025 | 5 | 5 | 100.0% | 0 |
| April 2025 | 24 | 24 | 83.3% | 0 |
| May 2025 | 31 | 31 | 87.1% | 0 |
| June 2025 | 42 | 42 | 76.2% | 0 |
| July 2025 | 51 | 50 | 64.0% | 1 |
| August 2025 | 34 | 34 | 88.2% | 0 |
| September 2025 | 35 | 35 | 82.9% | 0 |
| October 2025 | 22 | 22 | 63.6% | 0 |
| November 2025 | 5 | 5 | 80.0% | 0 |
| December 2025 | 3 | 3 | 66.7% | 0 |
| January 2026 | 23 | 23 | 91.3% | 0 |
| February 2026 | 20 | 20 | 85.0% | 0 |
| March 2026 | 7 | 7 | 57.1% | 0 |
| April 2026 | 31 | 31 | 51.6% | 0 |
| May 2026 | 39 | 39 | 51.3% | 0 |
| June 2026 | 10 | 10 | 70.0% | 0 |
| July 2026 | 9 | 9 | 88.9% | 0 |