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Route on-time record

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

Portland (Portland International Jetport) to Philadelphia (Philadelphia International Airport). 764 nonstop flights in Jun 2025 to May 2026, 77% arrived within 15 minutes and 3.7% were cancelled. The most reliable flight number was American 2951 at 8:04 AM.

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PWM → PHL

Portland to Philadelphia: 764 nonstop flights a year

On time (12 months)

77%

Cancelled

3.7%

avg delay 22 min

Best time to leave

Before 9 AM

87% on time vs 48% 3 to 6 PM

Most reliable airline

American

75% chance on time

Check PWM to PHL 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 2951

    8:04 AM → 9:45 AM1h 41m nonstop

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

    86%

    chance on time

    On time (history)
    89%
    Cancelled
    2.6%
    Avg arrival delay
    9 min
    • Arrived on time 89% of the time (147 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 87% on time; 3 to 6 PM: 48%).

    Moderate track record · 147 flights

    Find American 2951 fares Opens this date on Aviasales

  2. #2 · American 3209

    6:00 AM → 7:40 AM1h 40m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as American 2293; its record covers all of them.

    85%

    chance on time

    On time (history)
    88%
    Cancelled
    2.3%
    Avg arrival delay
    35 min
    • Arrived on time 88% of the time (84 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 87% on time; 3 to 6 PM: 48%).

    Moderate track record · 84 flights

    Find American 3209 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • American Airlines75%

    559 flights · 77% on time as flown · 2.3% cancel

On time by departure time

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

  • Before 9 AM87%

    416 flights · avg delay 15 min

  • Noon to 3 PM79%

    184 flights · avg delay 22 min

  • 3 to 6 PM48%

    145 flights · avg delay 40 min

Best day: Tuesday (84%). Worst: Thursday (74%).

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
76
F
80
M
81
A
81
M
83
J
73
J
70
A
72
S
81
O
80
N
93
D
85

What delays this route

  • Late-arriving aircraft41%
  • Airline (crew, maintenance, boarding)36%
  • Air traffic control and airport volume20%
  • Severe weather3%

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 PWM to PHL…

PWM to PHL questions

What time of day is best to fly PWM to PHL?
Before 9 AM: 87% of flights arrived on time, against 48% for departures 3 to 6 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 PWM to PHL?
American, with a season-adjusted 75% chance of operating and arriving on time over 559 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 PWM to PHL?
July (70% on time); the best was November (93%), 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 PWM

Live status: FAA delays and ground stops