Best Time to Fly PWM to BWI: On-Time Stats by Hour & Airline
Portland International Jetport → Baltimore/Washington International Thurgood Marshall
Data through July 2026 · Last updated October 18, 2026
1,342 flights were scheduled from Portland (PWM) to Baltimore (BWI) in the last 12 months, and 82.9% of those that flew arrived on time, 5.2 points above the US average of 77.6%.
Southwest Airlines was the only reporting airline with regular flights on this route.
November has been the best month (88% on time) and Friday the weakest day of the week (78%).
0.9% of flights were cancelled, versus 1.8% nationally.
PWM to BWI 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 | 82.9% | 52 min | 0.9% | 1,342 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly PWM to BWI
On-time arrival % by scheduled departure hour (local time), 2,670 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 90.0% | 1.0% | 577 |
| 6am–7am | 92.0% | 0.7% | 152 |
| 7am–8am | Limited data | 9 | |
| 8am–9am | 88.7% | 0.0% | 62 |
| 9am–10am | 91.1% | 0.0% | 45 |
| 10am–11am | 86.1% | 0.0% | 115 |
| 11am–12pm | 77.3% | 1.0% | 209 |
| 12pm–1pm | 83.9% | 0.5% | 224 |
| 1pm–2pm | 80.8% | 1.2% | 250 |
| 2pm–3pm | 81.2% | 0.6% | 183 |
| 3pm–4pm | 81.2% | 1.6% | 305 |
| 4pm–5pm | 71.6% | 0.6% | 171 |
| 5pm–6pm | 66.3% | 0.7% | 285 |
| 6pm–7pm | 74.3% | 0.0% | 75 |
| 7pm–8pm | Limited data | 8 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on PWM to BWI
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) | 90.4% | +6.3 pts | 0.0% | 52 |
| Christmas & New Year (Dec 20 - Jan 3) | 74.8% | -9.4 pts | 0.9% | 112 |
| Summer peak (Jun 15 - Aug 15) | 73.0% | -11.2 pts | 1.4% | 505 |
| All other days | 84.1% | — | 0.8% | 2,001 |
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).