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Route on-time record

BOS to PDX: most on-time flights and the best time to fly

Boston (Boston Logan International Airport) to Portland (Portland International Airport). 638 nonstop flights in Jun 2025 to May 2026, 76% arrived within 15 minutes and 1.1% were cancelled. The most reliable flight number was Alaska 311 at 6:00 AM.

Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.

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BOS → PDX

Boston to Portland: 638 nonstop flights a year

On time (12 months)

76%

Cancelled

1.1%

avg delay 15 min

Best time to leave

Before 9 AM

93% on time vs 38% 6 to 9 PM

Most reliable airline

Alaska

77% chance on time

Check BOS to PDX fares

Lowest nonstop fare seen in the next two months: $324 (Alaska 358 on 2026-11-05). Fares open on our travel partner (Aviasales). Pick the flight number you chose here.

Most reliable nonstop flights

Ranked by the chance the flight operates and arrives within 15 minutes of schedule, from Jun 2025 to May 2026 records.

  1. #1 · Alaska 311

    6:00 AM → 9:23 AM6h 23m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    86%

    chance on time

    On time (history)
    86%
    Cancelled
    0.0%
    Avg arrival delay
    5 min
    • Arrived on time 86% of the time (97 flights, Jun 2025 to May 2026).
    • Never cancelled in 97 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 93% on time; 6 to 9 PM: 38%).
    • Departs outside BOS's trouble window (noon to 6 PM, when 79% of its 196 ground stops and delay programs started).

    Moderate track record · 97 flights

    Find Alaska 311 fares Opens this date on Aviasales

  2. #2 · Alaska 1319

    4:27 PM → 7:48 PM6h 21m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    71%

    chance on time

    On time (history)
    71%
    Cancelled
    1.8%
    Avg arrival delay
    16 min
    • Arrived on time 71% of the time (322 flights, Jun 2025 to May 2026).
    • Departs inside BOS's trouble window: 79% of its 196 ground stops and delay programs started between noon and 6 PM.

    Strong track record · 322 flights

    Find Alaska 1319 fares Opens this date on Aviasales

  3. #3 · JetBlue 95

    10:06 AM → 1:10 PM6h 04m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    57%

    chance on time

    On time (history)
    52%
    Cancelled
    1.2%
    Avg arrival delay
    38 min
    • Arrived on time 52% of the time (85 flights, Jun 2025 to May 2026).
    • Departs outside BOS's trouble window (noon to 6 PM, when 79% of its 196 ground stops and delay programs started).
    • 53% of its delay minutes came from the plane arriving late from an earlier flight.

    Moderate track record · 85 flights

    Find JetBlue 95 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • Alaska Airlines77%

    533 flights · 79% on time as flown · 1.1% cancel

  • JetBlue65%

    105 flights · 61% on time as flown · 1.0% cancel

On time by departure time

All airlines, scheduled local departure, Jun 2025 to May 2026.

  • Before 9 AM93%

    210 flights · avg delay 3 min

  • 3 to 6 PM71%

    339 flights · avg delay 16 min

  • 6 to 9 PM38%

    67 flights · avg delay 48 min

Best day: Saturday (81%). Worst: Thursday (69%).

On time by month

All airlines, Jun 2023 to May 2026. Several years per month, so one stormy season doesn't define a month. Travel-month estimates use this seasonal pattern.

J
81
F
85
M
64
A
82
M
80
J
73
J
62
A
79
S
78
O
80
N
77
D
70

What delays this route

  • Late-arriving aircraft45%
  • Air traffic control and airport volume30%
  • Airline (crew, maintenance, boarding)24%

Share of delay minutes by the cause airlines report to the US DOT.

Historical odds, not a guarantee. Built from the US DOT Bureau of Transportation Statistics on-time reports (Jun 2025 to May 2026), FAA ground stop and delay program advisories, and 20 years of airport weather observations. Covers US airlines that report to the DOT; schedules are flights operated recently, so confirm times when you book. ATIS Alerts is not affiliated with any airline. Fares are what Aviasales travelers saw in recent searches (USD, one way, 1 adult), not live quotes; the partner site shows the current price. Fare links go to our travel partner and may earn us a commission at no cost to you. Affiliate disclosure

Finding the most reliable connections from BOS to PDX…

BOS to PDX questions

What time of day is best to fly BOS to PDX?
Before 9 AM: 93% of flights arrived on time, against 38% for departures 6 to 9 PM. Later flights inherit delays from earlier ones, so the first departures of the day usually run best.
Which airline is most on time from BOS to PDX?
Alaska, with a season-adjusted 77% chance of operating and arriving on time over 533 flights. The adjustment compares each airline with what the route did in the months it flew, so a carrier that skipped a stormy month gets no free credit.
What is the worst month for delays on BOS to PDX?
July (62% on time); the best was February (85%), averaged over Jun 2023 to May 2026.
Is this a prediction for my flight?
No. These are historical odds from the US DOT on-time reports, FAA advisories and airport weather records. Check your flight status and the FAA delay board on the day you fly.

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Live status: FAA delays and ground stops