WN3126
WN3126 (Southwest Airlines) is a multi-stop service on 26 routes, busiest St Louis to Boston. Of 521 departures recorded from October 2024 to July 2026, 68.5% left on time, according to the US BTS.
- On-time departures68.5%of 521 flights
- Average delay18.5 min
- July 202631▲ 14.8%vs July 2025
- Cancelled1.2%
- Legs flown under this number26
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 | 29 | 27 | ▼ 6.9% |
| February | 28 | 21 | ▼ 25.0% |
| March | 31 | 34 | ▲ 9.7% |
| April | 36 | 7 | ▼ 80.6% |
| May | 41 | – | – |
| June | 26 | 27 | ▲ 3.8% |
| July | 27 | 31 | ▲ 14.8% |
| August | 11 | – | – |
| September | 8 | – | – |
| October | 61 | – | in progress |
| November | 11 | – | – |
| December | 14 | – | – |
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 | 79.3% | 95.8% | ▲ 20.8% |
| February | 75.0% | 95.2% | ▲ 27.0% |
| March | 93.6% | 67.7% | ▼ 27.7% |
| April | 77.8% | 71.4% | ▼ 8.2% |
| May | 87.8% | – | – |
| June | 52.0% | 40.7% | ▼ 21.7% |
| July | 40.0% | 45.2% | ▲ 12.9% |
| August | 63.6% | – | – |
| September | 62.5% | – | – |
| October | 49.2% | – | in progress |
| November | 90.9% | – | – |
| December | 78.6% | – | – |
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 | 0 | 3 | – |
| February | 0 | 0 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | – | – |
| June | 1 | 0 | ▼ 100.0% |
| July | 2 | 0 | ▼ 100.0% |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 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 98.8% 515
- Cancelled 1.2% 6
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 |
|---|---|---|---|---|
| STL BOS St. Louis Lambert International Airport – Boston Logan International Airport | 1,680 | 16.9 min | 72.5% | 109 |
| LAX PHX Los Angeles International Airport – Phoenix Sky Harbor International Airport | 595 | 7.0 min | 84.5% | 58 |
| BWI STL Baltimore/Washington International Thurgood Marshall Airport – St. Louis Lambert International Airport | 1,185 | 42.2 min | 42.9% | 52 |
| BNA HOU Nashville International Airport – William P. Hobby Airport | 1,078 | 0.3 min | 95.5% | 47 |
| OMA BNA Eppley Airfield – Nashville International Airport | 985 | 25.7 min | 54.8% | 42 |
| OGG HNL Kahului International Airport – Daniel K. Inouye International Airport | 162 | 1.4 min | 97.0% | 33 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 4 | 4 | 50.0% | 0 |
| November 2024 | 25 | 25 | 60.0% | 0 |
| December 2024 | 22 | 22 | 77.3% | 0 |
| January 2025 | 29 | 29 | 79.3% | 0 |
| February 2025 | 28 | 28 | 75.0% | 0 |
| March 2025 | 31 | 31 | 93.6% | 0 |
| April 2025 | 36 | 36 | 77.8% | 0 |
| May 2025 | 41 | 41 | 87.8% | 0 |
| June 2025 | 26 | 25 | 52.0% | 1 |
| July 2025 | 27 | 25 | 40.0% | 2 |
| August 2025 | 11 | 11 | 63.6% | 0 |
| September 2025 | 8 | 8 | 62.5% | 0 |
| October 2025 | 61 | 61 | 49.2% | 0 |
| November 2025 | 11 | 11 | 90.9% | 0 |
| December 2025 | 14 | 14 | 78.6% | 0 |
| January 2026 | 27 | 24 | 95.8% | 3 |
| February 2026 | 21 | 21 | 95.2% | 0 |
| March 2026 | 34 | 34 | 67.7% | 0 |
| April 2026 | 7 | 7 | 71.4% | 0 |
| June 2026 | 27 | 27 | 40.7% | 0 |
| July 2026 | 31 | 31 | 45.2% | 0 |