WN1851
WN1851 (Southwest Airlines) is a multi-stop service on 37 routes, busiest Tampa to Birmingham. Of 734 departures recorded from October 2024 to July 2026, 80.6% left on time, according to the US BTS.
- On-time departures80.6%of 734 flights
- Average delay10.2 min
- July 202631▼ 8.8%vs July 2025
- Cancelled0.3%
- Legs flown under this number37
Recorded departures by month
All legs under this number combined; see the leg table.
The most recent periods19 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 40 | 29 | ▼ 27.5% |
| February | 63 | 27 | ▼ 57.1% |
| March | 36 | 81 | ▲ 125.0% |
| April | 36 | 41 | ▲ 13.9% |
| May | 41 | 31 | ▼ 24.4% |
| June | 34 | 30 | ▼ 11.8% |
| July | 34 | 31 | ▼ 8.8% |
| August | 16 | – | – |
| September | 13 | – | – |
| October | 26 | – | in progress |
| November | 43 | – | – |
| December | 49 | – | – |
| Year to date (Jan–Jul) | 284 | 270 | ▼ 4.9% |
according to the US BTS · October 2024 → July 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 periods19 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 95.0% | 82.1% | ▼ 13.5% |
| February | 92.1% | 74.1% | ▼ 19.5% |
| March | 86.1% | 70.4% | ▼ 18.3% |
| April | 91.7% | 80.5% | ▼ 12.2% |
| May | 92.7% | 100.0% | ▲ 7.9% |
| June | 47.1% | 96.7% | ▲ 105.4% |
| July | 63.6% | 90.3% | ▲ 41.9% |
| August | 62.5% | – | – |
| September | 84.6% | – | – |
| October | 61.5% | – | in progress |
| November | 72.1% | – | – |
| December | 69.4% | – | – |
| Year-to-date average (Jan–Jul) | 81.2% | 84.9% | ▲ 4.5% |
according to the US BTS · October 2024 → July 2026
Average departure delay by month
according to the US BTS · October 2024 → July 2026
Cancelled departures by month
The most recent periods19 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 1 | – |
| February | 0 | 0 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 1 | 0 | ▼ 100.0% |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 1 | 1 | 0.0% |
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% 732
- Cancelled 0.3% 2
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 |
|---|---|---|---|---|
| TPA BHM Tampa International Airport – Birmingham-Shuttlesworth International Airport | 740 | 12.7 min | 70.3% | 64 |
| DAL MDW Dallas Love Field – Chicago Midway International Airport | 1,277 | 47.2 min | 49.2% | 60 |
| HNL OGG Daniel K. Inouye International Airport – Kahului International Airport | 162 | 0.2 min | 93.1% | 58 |
| LIH OAK Lihue Airport – Oakland San Francisco Bay Airport | 3,950 | -4.2 min | 96.6% | 58 |
| BUF RSW Buffalo Niagara International Airport – Southwest Florida International Airport | 1,845 | -0.2 min | 94.0% | 50 |
| AUS MDW Austin Bergstrom International Airport – Chicago Midway International Airport | 1,565 | 6.1 min | 87.8% | 42 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 16 | 16 | 93.8% | 0 |
| November 2024 | 5 | 5 | 100.0% | 0 |
| December 2024 | 12 | 12 | 100.0% | 0 |
| January 2025 | 40 | 40 | 95.0% | 0 |
| February 2025 | 63 | 63 | 92.1% | 0 |
| March 2025 | 36 | 36 | 86.1% | 0 |
| April 2025 | 36 | 36 | 91.7% | 0 |
| May 2025 | 41 | 41 | 92.7% | 0 |
| June 2025 | 34 | 34 | 47.1% | 0 |
| July 2025 | 34 | 33 | 63.6% | 1 |
| August 2025 | 16 | 16 | 62.5% | 0 |
| September 2025 | 13 | 13 | 84.6% | 0 |
| October 2025 | 26 | 26 | 61.5% | 0 |
| November 2025 | 43 | 43 | 72.1% | 0 |
| December 2025 | 49 | 49 | 69.4% | 0 |
| January 2026 | 29 | 28 | 82.1% | 1 |
| February 2026 | 27 | 27 | 74.1% | 0 |
| March 2026 | 81 | 81 | 70.4% | 0 |
| April 2026 | 41 | 41 | 80.5% | 0 |
| May 2026 | 31 | 31 | 100.0% | 0 |
| June 2026 | 30 | 30 | 96.7% | 0 |
| July 2026 | 31 | 31 | 90.3% | 0 |