WN171
WN171 (Southwest Airlines) is a multi-stop service on 27 routes, busiest Houston to St Louis. Of 689 departures recorded from October 2024 to June 2026, 87.4% left on time, according to the US BTS.
- On-time departures87.4%of 689 flights
- Average delay4.7 min
- June 20263▼ 94.9%vs June 2025
- Cancelled1.3%
- Legs flown under this number27
Recorded departures by month
All legs under this number combined; see the leg table.
The most recent periods18 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 30 | 31 | ▲ 3.3% |
| February | 28 | 31 | ▲ 10.7% |
| March | 53 | 27 | ▼ 49.1% |
| April | 39 | 29 | ▼ 25.6% |
| May | 34 | 31 | ▼ 8.8% |
| June | 59 | 3 | ▼ 94.9% |
| July | 58 | – | – |
| August | 48 | – | – |
| September | 43 | – | – |
| October | 18 | – | in progress |
| November | 28 | – | – |
| December | 18 | – | – |
| Year to date (Jan–Jun) | 243 | 152 | ▼ 37.4% |
according to the US BTS · October 2024 → June 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 periods18 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 92.0% | 86.2% | ▼ 6.3% |
| February | 96.2% | 100.0% | ▲ 4.0% |
| March | 77.4% | 92.6% | ▲ 19.7% |
| April | 84.6% | 93.1% | ▲ 10.0% |
| May | 91.2% | 87.1% | ▼ 4.5% |
| June | 81.4% | 66.7% | ▼ 18.1% |
| July | 84.5% | – | – |
| August | 95.8% | – | – |
| September | 95.4% | – | – |
| October | 77.8% | – | in progress |
| November | 82.1% | – | – |
| December | 33.3% | – | – |
| Year-to-date average (Jan–Jun) | 87.1% | 87.6% | ▲ 0.6% |
according to the US BTS · October 2024 → June 2026
Average departure delay by month
according to the US BTS · October 2024 → June 2026
Cancelled departures by month
The most recent periods18 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 5 | 2 | ▼ 60.0% |
| February | 2 | 0 | ▼ 100.0% |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | – | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jun) | 7 | 2 | ▼ 71.4% |
according to the US BTS · October 2024 → June 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 98.7% 680
- Cancelled 1.3% 9
Share of all recorded flights in the period, all legs. · Oct 12, 2024 → Jun 3, 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 |
|---|---|---|---|---|
| HOU STL William P. Hobby Airport – St. Louis Lambert International Airport | 1,108 | 0.9 min | 94.5% | 116 |
| BOI DEN Boise Air Terminal/Gowen Field – Denver International Airport | 1,042 | 0.2 min | 94.9% | 79 |
| PHX SMF Phoenix Sky Harbor International Airport – Sacramento International Airport | 1,040 | 2.4 min | 87.9% | 58 |
| AMA DAL Rick Husband Amarillo International Airport – Dallas Love Field | 520 | -0.8 min | 96.4% | 58 |
| MDW BOS Chicago Midway International Airport – Boston Logan International Airport | 1,381 | 10.4 min | 80.4% | 51 |
| ABQ LAS Albuquerque International Sunport – Harry Reid International Airport | 781 | 9.1 min | 90.5% | 42 |
| MCI MDW Kansas City International Airport – Chicago Midway International Airport | 650 | 8.1 min | 85.7% | 35 |
| ATL MDW Hartsfield Jackson Atlanta International Airport – Chicago Midway International Airport | 952 | 6.1 min | 80.0% | 30 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 20 | 20 | 100.0% | 0 |
| November 2024 | 30 | 30 | 96.7% | 0 |
| December 2024 | 31 | 31 | 90.3% | 0 |
| January 2025 | 30 | 25 | 92.0% | 5 |
| February 2025 | 28 | 26 | 96.2% | 2 |
| March 2025 | 53 | 53 | 77.4% | 0 |
| April 2025 | 39 | 39 | 84.6% | 0 |
| May 2025 | 34 | 34 | 91.2% | 0 |
| June 2025 | 59 | 59 | 81.4% | 0 |
| July 2025 | 58 | 58 | 84.5% | 0 |
| August 2025 | 48 | 48 | 95.8% | 0 |
| September 2025 | 43 | 43 | 95.4% | 0 |
| October 2025 | 18 | 18 | 77.8% | 0 |
| November 2025 | 28 | 28 | 82.1% | 0 |
| December 2025 | 18 | 18 | 33.3% | 0 |
| January 2026 | 31 | 29 | 86.2% | 2 |
| February 2026 | 31 | 31 | 100.0% | 0 |
| March 2026 | 27 | 27 | 92.6% | 0 |
| April 2026 | 29 | 29 | 93.1% | 0 |
| May 2026 | 31 | 31 | 87.1% | 0 |
| June 2026 | 3 | 3 | 66.7% | 0 |