Portland (PDX) to Boston (BOS): On-Time Performance
Data through May 2026
Portland (PDX) to Boston (BOS) effectively runs on two schedules. In February 2026, 100% of arrivals were on time; in May 2025 that fell to 56% — a 44-point seasonal swing. Across the full period the route averages 77% on-time against a national 78%. Morning departures also hold up better than evening ones (83% vs 71%), which matters most in the rough months.
- On-time
- 77%
- arrived <15 min late
- Avg delay
- 16 min
- completed flights
- Cancelled
- 0.7%
- Flights/day
- 1.7
- last 12 months
- Duration
- 5h 24m
- scheduled
- Distance
- 2,537 mi
Best airline from PDX to BOS
2 airlines flew this route regularly between 2024-06 and 2026-05.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Alaska Airlinesmost reliable | 83% | 8 min | 0.6% | 1,029 |
| JetBlue Airways | 57% | 44 min | 1.1% | 285 |
Monthly on-time trend
Best time to fly from PDX to BOS
Aim for departures around 7 a.m. (84% on-time); avoid 10 p.m. departures (61%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 81% | 10 min |
| Tuesday | 74% | 19 min |
| Wednesday | 76% | 18 min |
| Thursday | 73% | 21 min |
| Friday | 75% | 21 min |
| Saturday | 79% | 9 min |
| Sundaybest | 82% | 12 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft33%
- Airline operations39%
- National airspace system27%
- Weather1%
Frequently asked questions
- How often are flights from PDX to BOS delayed?
- 23% of PDX–BOS flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-06 and 2026-05. The average arrival delay across completed flights was 16 minutes.
- Which airline is most reliable from PDX to BOS?
- Alaska Airlines has the best on-time record on this route at 83%, based on 1,029 flights. 2 airlines flew PDX–BOS frequently enough to compare in this period.
- What is the best time of day to fly from PDX to BOS?
- Departures around 7 a.m. have the best record (84% on-time), while departures around 10 p.m. have the worst (61%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from PDX to BOS?
- The scheduled PDX–BOS flight time averages 5h 24m over 2,537 miles. Actual arrival times vary — flights on this route land 15+ minutes late 23% of the time.
- How often are PDX to BOS flights cancelled?
- 0.7% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, at or below the national rate of 1.6%.
- What is the worst month to fly from PDX to BOS?
- May 2025 was the roughest month in this dataset, with only 56% of arrivals on time. The best was February 2026 at 100%. If your dates are flexible, that 44-point gap is worth planning around.
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Based on 1,314 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.