Skip to content

All Products

Aviation Intelligence

Alerts & Airspace

Free Pilot Tools & Widgets

RC Aviation

Games & Learning

Weather Research & More

Pilot Resources

My Airports

Your shortcuts, saved on this device. Search to add an airport.

No airports saved yet. Add the fields you visit most.

Ask ATIS

Route on-time record

PHL to PWM: most on-time flights and the best time to fly

Philadelphia (Philadelphia International Airport) to Portland (Portland International Jetport). 765 nonstop flights in Jun 2025 to May 2026, 73% arrived within 15 minutes and 3.4% were cancelled. The most reliable flight number was American 1211 at 9:55 PM.

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

Find me the most reliable flights fromtoonreturning(optional)

PHL → PWM

Philadelphia to Portland: 765 nonstop flights a year

On time (12 months)

73%

Cancelled

3.4%

avg delay 25 min

Best time to leave

9 AM to noon

83% on time vs 65% 6 to 9 PM

Most reliable airline

American

71% chance on time

Check PHL to PWM fares

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 · American 1211

    9:55 PM → 11:27 PM1h 32m nonstop

    Local times, typical schedule. Last flown 2026-05-19.

    74%

    chance on time

    On time (history)
    84%
    Cancelled
    2.3%
    Avg arrival delay
    12 min
    • Arrived on time 84% of the time (43 flights, Jun 2025 to May 2026).
    • Departs outside PHL's trouble window (2 PM to 8 PM, when 72% of its 95 ground stops and delay programs started).
    • 53% of its delay minutes came from the plane arriving late from an earlier flight.

    Limited track record · 43 flights

    Find American 1211 fares Opens this date on Aviasales

  2. #2 · American 3030

    10:20 PM → 11:51 PM1h 31m nonstop

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

    71%

    chance on time

    On time (history)
    73%
    Cancelled
    0.0%
    Avg arrival delay
    12 min
    • Arrived on time 73% of the time (11 flights, Jun 2025 to May 2026).
    • Departs outside PHL's trouble window (2 PM to 8 PM, when 72% of its 95 ground stops and delay programs started).

    Limited track record · 11 flights

    Find American 3030 fares Opens this date on Aviasales

  3. #3 · American 1889

    8:10 PM → 9:46 PM1h 36m nonstop

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

    64%

    chance on time

    On time (history)
    62%
    Cancelled
    1.9%
    Avg arrival delay
    36 min
    • Arrived on time 62% of the time (153 flights, Jun 2025 to May 2026).
    • Leaves in this route's least on-time window (6 to 9 PM: 65% on time; 9 AM to noon: 83%).
    • Departs outside PHL's trouble window (2 PM to 8 PM, when 72% of its 95 ground stops and delay programs started).
    • 53% of its delay minutes came from the plane arriving late from an earlier flight.

    Moderate track record · 153 flights

    Find American 1889 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • American Airlines71%

    560 flights · 72% on time as flown · 2.1% cancel

On time by departure time

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

  • 9 AM to noon83%

    190 flights · avg delay 18 min

  • Noon to 3 PM73%

    159 flights · avg delay 18 min

  • 3 to 6 PM77%

    35 flights · avg delay 20 min

  • 6 to 9 PM65%

    144 flights · avg delay 30 min

  • After 9 PM70%

    237 flights · avg delay 32 min

Best day: Wednesday (83%). Worst: Thursday (70%).

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
77
F
75
M
80
A
85
M
82
J
69
J
64
A
66
S
80
O
80
N
91
D
88

What delays this route

  • Late-arriving aircraft48%
  • Airline (crew, maintenance, boarding)35%
  • Air traffic control and airport volume12%
  • Severe weather5%

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 PHL to PWM…

PHL to PWM questions

What time of day is best to fly PHL to PWM?
9 AM to noon: 83% of flights arrived on time, against 65% for departures 6 to 9 PM.
Which airline is most on time from PHL to PWM?
American, with a season-adjusted 71% chance of operating and arriving on time over 560 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 PHL to PWM?
July (64% on time); the best was November (91%), 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.

More routes from PHL

Most on-time flights from PHL on every route →

Live status: FAA delays and ground stops