WN3735
WN3735 (Southwest Airlines) is a multi-stop service on 20 routes, busiest Seattle to Phoenix. Of 423 departures recorded from October 2024 to July 2026, 70.6% left on time, according to the US BTS.
- On-time departures70.6%of 423 flights
- Average delay15.8 min
- July 202627▼ 37.2%vs July 2025
- Cancelled1.2%
- Legs flown under this number20
Recorded departures by month
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods17 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 34 | – | – |
| February | 28 | 3 | ▼ 89.3% |
| March | 9 | 11 | ▲ 22.2% |
| April | 7 | 5 | ▼ 28.6% |
| May | 9 | 5 | ▼ 44.4% |
| June | 39 | 23 | ▼ 41.0% |
| July | 43 | 27 | ▼ 37.2% |
| August | 29 | – | – |
| September | 26 | – | – |
| October | 1 | – | in progress |
| November | 1 | – | – |
| December | – | – | – |
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 periods17 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 64.7% | – | – |
| February | 92.9% | 66.7% | ▼ 28.2% |
| March | 77.8% | 90.9% | ▲ 16.9% |
| April | 100.0% | 40.0% | ▼ 60.0% |
| May | 100.0% | 40.0% | ▼ 60.0% |
| June | 76.9% | 65.2% | ▼ 15.2% |
| July | 82.1% | 81.5% | ▼ 0.7% |
| August | 58.6% | – | – |
| September | 80.8% | – | – |
| October | 100.0% | – | in progress |
| November | 100.0% | – | – |
| December | – | – | – |
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 periods17 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | – | – |
| February | 0 | 0 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 4 | 0 | ▼ 100.0% |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | – | – | – |
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 98.8% 418
- Cancelled 1.2% 5
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
4| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| SEA PHX Seattle–Tacoma International Airport – Phoenix Sky Harbor International Airport | 1,782 | 12.2 min | 79.1% | 105 |
| SLC BWI Salt Lake City International Airport – Baltimore/Washington International Thurgood Marshall Airport | 2,994 | 11.2 min | 74.0% | 50 |
| MDW PDX Chicago Midway International Airport – Portland International Airport | 2,811 | 15.1 min | 68.0% | 50 |
| MDW DCA Chicago Midway International Airport – Ronald Reagan Washington National Airport | 964 | 42.5 min | 45.2% | 35 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 11 | 11 | 63.6% | 0 |
| November 2024 | 68 | 68 | 50.0% | 0 |
| December 2024 | 44 | 43 | 65.1% | 1 |
| January 2025 | 34 | 34 | 64.7% | 0 |
| February 2025 | 28 | 28 | 92.9% | 0 |
| March 2025 | 9 | 9 | 77.8% | 0 |
| April 2025 | 7 | 7 | 100.0% | 0 |
| May 2025 | 9 | 9 | 100.0% | 0 |
| June 2025 | 39 | 39 | 76.9% | 0 |
| July 2025 | 43 | 39 | 82.1% | 4 |
| August 2025 | 29 | 29 | 58.6% | 0 |
| September 2025 | 26 | 26 | 80.8% | 0 |
| October 2025 | 1 | 1 | 100.0% | 0 |
| November 2025 | 1 | 1 | 100.0% | 0 |
| February 2026 | 3 | 3 | 66.7% | 0 |
| March 2026 | 11 | 11 | 90.9% | 0 |
| April 2026 | 5 | 5 | 40.0% | 0 |
| May 2026 | 5 | 5 | 40.0% | 0 |
| June 2026 | 23 | 23 | 65.2% | 0 |
| July 2026 | 27 | 27 | 81.5% | 0 |