Best Time to Fly BWI to PWM: On-Time Stats by Hour & Airline
Baltimore/Washington International Thurgood Marshall → Portland International Jetport
Data through July 2026 · Last updated October 18, 2026
1,342 flights were scheduled from Baltimore (BWI) to Portland (PWM) in the last 12 months, and 80.8% of those that flew arrived on time, 3.2 points above the US average of 77.6%.
Southwest Airlines was the only reporting airline with regular flights on this route.
February has been the best month (88% on time) and Sunday the weakest day of the week (72%).
1.4% of flights were cancelled, versus 1.8% nationally.
BWI to PWM on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| Southwest Airlines | 80.8% | 45 min | 1.4% | 1,342 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly BWI to PWM
On-time arrival % by scheduled departure hour (local time), 2,669 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 8am–9am | 92.5% | 0.0% | 174 |
| 9am–10am | 83.6% | 0.4% | 227 |
| 10am–11am | 88.4% | 1.0% | 306 |
| 11am–12pm | 92.6% | 0.0% | 162 |
| 12pm–1pm | 83.2% | 1.2% | 163 |
| 1pm–2pm | 80.9% | 0.9% | 327 |
| 2pm–3pm | 86.8% | 0.0% | 115 |
| 3pm–4pm | 76.8% | 0.9% | 230 |
| 4pm–5pm | 66.3% | 0.0% | 92 |
| 5pm–6pm | 49.2% | 4.4% | 68 |
| 6pm–7pm | 88.1% | 0.0% | 42 |
| 7pm–8pm | 64.7% | 2.9% | 35 |
| 8pm–9pm | 84.4% | 0.6% | 174 |
| 9pm–10pm | 66.2% | 2.1% | 239 |
| 10pm–11pm | 57.2% | 3.5% | 315 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on BWI to PWM
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | 82.7% | +1.3 pts | 0.0% | 52 |
| Christmas & New Year (Dec 20 - Jan 3) | 73.2% | -8.2 pts | 0.0% | 112 |
| Summer peak (Jun 15 - Aug 15) | 66.7% | -14.7 pts | 2.4% | 505 |
| All other days | 81.4% | — | 1.0% | 2,000 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).