WN3634
WN3634 (Southwest Airlines) is a multi-stop service on 21 routes, busiest San Francisco to Nashville. Of 379 departures recorded from October 2024 to July 2026, 68.5% left on time, according to the US BTS.
- On-time departures68.5%of 379 flights
- Average delay17.8 min
- July 202631▼ 13.9%vs July 2025
- Cancelled0.3%
- Legs flown under this number21
Recorded departures by month
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods18 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 4 | 7 | ▲ 75.0% |
| February | 8 | 8 | 0.0% |
| March | 9 | 28 | ▲ 211.1% |
| April | 5 | 27 | ▲ 440.0% |
| May | 4 | 26 | ▲ 550.0% |
| June | 31 | 30 | ▼ 3.2% |
| July | 36 | 31 | ▼ 13.9% |
| August | 5 | – | – |
| September | – | – | – |
| October | 4 | – | in progress |
| November | 43 | – | – |
| December | 37 | – | – |
| Year to date (Jan–Jul) | 97 | 157 | ▲ 61.9% |
according to the US BTS · October 2024 → July 2026
On-time departures by month
Months without data are left blank.
On time = departure within 15 minutes of schedule. Non-cancelled flights with a recorded delay only.
The most recent periods18 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 66.7% | 57.1% | ▼ 14.3% |
| February | 87.5% | 87.5% | 0.0% |
| March | 100.0% | 82.1% | ▼ 17.9% |
| April | 100.0% | 70.4% | ▼ 29.6% |
| May | 75.0% | 61.5% | ▼ 17.9% |
| June | 51.6% | 33.3% | ▼ 35.4% |
| July | 63.9% | 48.4% | ▼ 24.3% |
| August | 20.0% | – | – |
| September | – | – | – |
| October | 50.0% | – | in progress |
| November | 74.4% | – | – |
| December | 86.5% | – | – |
| Year-to-date average (Jan–Jul) | 77.8% | 62.9% | ▼ 19.1% |
according to the US BTS · October 2024 → July 2026
Average departure delay by month
Months without data are left blank.
according to the US BTS · October 2024 → July 2026
Cancelled departures by month
Months without data are left blank.
The most recent periods18 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 1 | 0 | ▼ 100.0% |
| February | 0 | 0 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | – | – | – |
| 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 99.7% 378
- Cancelled 0.3% 1
Share of all recorded flights in the period, all legs. · Oct 13, 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 |
|---|---|---|---|---|
| SFO BNA San Francisco International Airport – Nashville International Airport | 3,161 | 41.2 min | 39.7% | 58 |
| PIT MDW Pittsburgh International Airport – Chicago Midway International Airport | 646 | 7.5 min | 78.3% | 46 |
| LAS SDF Harry Reid International Airport – Louisville Muhammad Ali International Airport | 2,607 | 34.1 min | 42.2% | 45 |
| LGB MDW Long Beach International Airport – Chicago Midway International Airport | 2,797 | 14.6 min | 61.9% | 42 |
| MCO PIT Orlando International Airport – Pittsburgh International Airport | 1,345 | 10.8 min | 83.3% | 36 |
| LAS PIT Harry Reid International Airport – Pittsburgh International Airport | 3,066 | 7.6 min | 84.9% | 33 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 4 | 4 | 100.0% | 0 |
| November 2024 | 10 | 10 | 90.0% | 0 |
| December 2024 | 22 | 22 | 90.9% | 0 |
| January 2025 | 4 | 3 | 66.7% | 1 |
| February 2025 | 8 | 8 | 87.5% | 0 |
| March 2025 | 9 | 9 | 100.0% | 0 |
| April 2025 | 5 | 5 | 100.0% | 0 |
| May 2025 | 4 | 4 | 75.0% | 0 |
| June 2025 | 31 | 31 | 51.6% | 0 |
| July 2025 | 36 | 36 | 63.9% | 0 |
| August 2025 | 5 | 5 | 20.0% | 0 |
| October 2025 | 4 | 4 | 50.0% | 0 |
| November 2025 | 43 | 43 | 74.4% | 0 |
| December 2025 | 37 | 37 | 86.5% | 0 |
| January 2026 | 7 | 7 | 57.1% | 0 |
| February 2026 | 8 | 8 | 87.5% | 0 |
| March 2026 | 28 | 28 | 82.1% | 0 |
| April 2026 | 27 | 27 | 70.4% | 0 |
| May 2026 | 26 | 26 | 61.5% | 0 |
| June 2026 | 30 | 30 | 33.3% | 0 |
| July 2026 | 31 | 31 | 48.4% | 0 |