WN3978
WN3978 (Southwest Airlines) is a multi-stop service on 23 routes, busiest Portland to Baltimore. Of 442 departures recorded from October 2024 to July 2026, 71.0% left on time, according to the US BTS.
- On-time departures71.0%of 442 flights
- Average delay17.5 min
- July 202614▼ 65.0%vs July 2025
- Cancelled0.9%
- Legs flown under this number23
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 | 3 | 1 | ▼ 66.7% |
| February | 8 | 7 | ▼ 12.5% |
| March | 21 | 55 | ▲ 161.9% |
| April | 20 | 30 | ▲ 50.0% |
| May | 22 | 21 | ▼ 4.5% |
| June | 34 | 15 | ▼ 55.9% |
| July | 40 | 14 | ▼ 65.0% |
| August | 31 | – | – |
| September | 30 | – | – |
| October | 31 | – | in progress |
| November | 13 | – | – |
| December | 4 | – | – |
| Year to date (Jan–Jul) | 148 | 143 | ▼ 3.4% |
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 | 0.0% | 100.0% | – |
| February | 75.0% | 85.7% | ▲ 14.3% |
| March | 90.5% | 70.6% | ▼ 22.0% |
| April | 80.0% | 83.3% | ▲ 4.2% |
| May | 86.4% | 90.5% | ▲ 4.8% |
| June | 41.2% | 73.3% | ▲ 78.1% |
| July | 52.5% | 85.7% | ▲ 63.3% |
| August | 77.4% | – | – |
| September | 76.7% | – | – |
| October | 67.7% | – | in progress |
| November | 69.2% | – | – |
| December | 75.0% | – | – |
| Year-to-date average (Jan–Jul) | 60.8% | 84.2% | ▲ 38.5% |
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 | 0 | – |
| February | 0 | 0 | – |
| March | 0 | 4 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 0 | 4 |
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 99.1% 438
- Cancelled 0.9% 4
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
5| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| PDX BWI Portland International Airport – Baltimore/Washington International Thurgood Marshall Airport | 3,786 | 12.3 min | 77.6% | 58 |
| ATL MDW Hartsfield Jackson Atlanta International Airport – Chicago Midway International Airport | 952 | 51.0 min | 37.3% | 51 |
| RDU AUS Raleigh-Durham International Airport – Austin Bergstrom International Airport | 1,866 | 9.7 min | 88.1% | 42 |
| MCO SJU Orlando International Airport – Luis Munoz Marin International Airport | 1,913 | 11.3 min | 67.7% | 31 |
| BOI OAK Boise Air Terminal/Gowen Field – Oakland San Francisco Bay Airport | 823 | 2.4 min | 87.1% | 31 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 15 | 15 | 46.7% | 0 |
| November 2024 | 18 | 18 | 72.2% | 0 |
| December 2024 | 9 | 9 | 66.7% | 0 |
| January 2025 | 3 | 3 | 0.0% | 0 |
| February 2025 | 8 | 8 | 75.0% | 0 |
| March 2025 | 21 | 21 | 90.5% | 0 |
| April 2025 | 20 | 20 | 80.0% | 0 |
| May 2025 | 22 | 22 | 86.4% | 0 |
| June 2025 | 34 | 34 | 41.2% | 0 |
| July 2025 | 40 | 40 | 52.5% | 0 |
| August 2025 | 31 | 31 | 77.4% | 0 |
| September 2025 | 30 | 30 | 76.7% | 0 |
| October 2025 | 31 | 31 | 67.7% | 0 |
| November 2025 | 13 | 13 | 69.2% | 0 |
| December 2025 | 4 | 4 | 75.0% | 0 |
| January 2026 | 1 | 1 | 100.0% | 0 |
| February 2026 | 7 | 7 | 85.7% | 0 |
| March 2026 | 55 | 51 | 70.6% | 4 |
| April 2026 | 30 | 30 | 83.3% | 0 |
| May 2026 | 21 | 21 | 90.5% | 0 |
| June 2026 | 15 | 15 | 73.3% | 0 |
| July 2026 | 14 | 14 | 85.7% | 0 |