Best Time to Fly PDX to BWI: On-Time Stats by Hour & Airline
Portland International → Baltimore/Washington International Thurgood Marshall
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 84.4% of Portland (PDX) to Baltimore (BWI) flights arrived on time (200 scheduled flights). That is 6.8 points above the national average of 77.6%.
Among 2 airlines, Alaska Airlines led with 93.7% on time and Southwest Airlines was last with 78.3%.
Over 24 months, Tuesday was the most reliable day (91% on time) and September the worst month (79%).
The cancellation rate was 0.0% (US average 1.8%).
PDX 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 |
|---|---|---|---|---|
| Alaska Airlines | 93.7% | 25 min | 0.0% | 80 |
| Southwest Airlines | 78.3% | 44 min | 0.0% | 120 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly PDX to BWI
On-time arrival % by scheduled departure hour (local time), 310 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 6am–7am | 85.0% | 0.0% | 40 |
| 7am–8am | 93.7% | 0.0% | 80 |
| 1pm–2pm | Limited data | 13 | |
| 9pm–10pm | 78.0% | 0.0% | 177 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on PDX to BWI
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Summer peak (Jun 15 - Aug 15) | 80.5% | -3.7 pts | 0.6% | 171 |
| All other days | 84.2% | — | 0.0% | 139 |
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).