WN3551
WN3551 (Southwest Airlines) is a multi-stop service on 15 routes, busiest Boise to Phoenix. Of 444 departures recorded from October 2024 to July 2026, 76.5% left on time, according to the US BTS.
- On-time departures76.5%of 444 flights
- Average delay11.3 min
- July 202644▲ 144.4%vs July 2025
- Cancelled0.2%
- Legs flown under this number15
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 | 31 | 3 | ▼ 90.3% |
| February | 26 | – | – |
| March | 4 | 28 | ▲ 600.0% |
| April | 14 | 24 | ▲ 71.4% |
| May | 17 | 21 | ▲ 23.5% |
| June | 17 | 42 | ▲ 147.1% |
| July | 18 | 44 | ▲ 144.4% |
| August | 21 | – | – |
| September | 21 | – | – |
| October | – | – | in progress |
| November | 27 | – | – |
| December | 22 | – | – |
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 | 93.6% | 66.7% | ▼ 28.7% |
| February | 92.3% | – | – |
| March | 100.0% | 92.9% | ▼ 7.1% |
| April | 92.9% | 87.5% | ▼ 5.8% |
| May | 82.4% | 95.2% | ▲ 15.7% |
| June | 76.5% | 35.7% | ▼ 53.3% |
| July | 83.3% | 16.3% | ▼ 80.5% |
| August | 95.2% | – | – |
| September | 95.2% | – | – |
| October | – | – | in progress |
| November | 88.9% | – | – |
| December | 86.4% | – | – |
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 | 0 | – |
| February | 0 | – | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 1 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | – | – | 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 99.8% 443
- Cancelled 0.2% 1
Share of all recorded flights in the period, all legs. · Oct 12, 2024 → Jul 31, 2026
On time, leg by leg
Departures within 15 minutes of schedule; small figure = departures recorded.
Legs flown under this number
8| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| BOI PHX Boise Air Terminal/Gowen Field – Phoenix Sky Harbor International Airport | 1,184 | 4.3 min | 90.4% | 114 |
| SAN SMF San Diego International Airport – Sacramento International Airport | 773 | 45.6 min | 19.6% | 57 |
| STL PIT St. Louis Lambert International Airport – Pittsburgh International Airport | 889 | -0.5 min | 91.3% | 46 |
| OAK MDW Oakland San Francisco Bay Airport – Chicago Midway International Airport | 2,961 | 4.6 min | 92.9% | 42 |
| DEN AUS Denver International Airport – Austin Bergstrom International Airport | 1,249 | -1.2 min | 97.5% | 40 |
| AUS ATL Austin Bergstrom International Airport – Hartsfield Jackson Atlanta International Airport | 1,305 | 0.5 min | 88.2% | 34 |
| ABQ MCI Albuquerque International Sunport – Kansas City International Airport | 1,154 | 9.4 min | 76.5% | 34 |
| LAS KOA Harry Reid International Airport – Ellison Onizuka Kona International Airport at Keāhole | 4,369 | 3.6 min | 90.9% | 33 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 4 | 4 | 75.0% | 0 |
| November 2024 | 28 | 28 | 92.9% | 0 |
| December 2024 | 32 | 32 | 75.0% | 0 |
| January 2025 | 31 | 31 | 93.6% | 0 |
| February 2025 | 26 | 26 | 92.3% | 0 |
| March 2025 | 4 | 4 | 100.0% | 0 |
| April 2025 | 14 | 14 | 92.9% | 0 |
| May 2025 | 17 | 17 | 82.4% | 0 |
| June 2025 | 17 | 17 | 76.5% | 0 |
| July 2025 | 18 | 18 | 83.3% | 0 |
| August 2025 | 21 | 21 | 95.2% | 0 |
| September 2025 | 21 | 21 | 95.2% | 0 |
| November 2025 | 27 | 27 | 88.9% | 0 |
| December 2025 | 22 | 22 | 86.4% | 0 |
| January 2026 | 3 | 3 | 66.7% | 0 |
| March 2026 | 28 | 28 | 92.9% | 0 |
| April 2026 | 24 | 24 | 87.5% | 0 |
| May 2026 | 21 | 21 | 95.2% | 0 |
| June 2026 | 42 | 42 | 35.7% | 0 |
| July 2026 | 44 | 43 | 16.3% | 1 |