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Route on-time record

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

Portland (Portland International Jetport) to Chicago (Chicago O'Hare International Airport). 1,461 nonstop flights in Jun 2025 to May 2026, 76% arrived within 15 minutes and 2.8% were cancelled. The most reliable flight number was United 723 at 6:00 AM.

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

Find me the most reliable flights fromtoonreturning(optional)

PWM → ORD

Portland to Chicago: 1,461 nonstop flights a year

On time (12 months)

76%

Cancelled

2.8%

avg delay 21 min

Best time to leave

Before 9 AM

88% on time vs 61% 3 to 6 PM

Most reliable airline

Republic

79% chance on time

Check PWM to ORD fares

Lowest nonstop fare seen in the next two months: $216 (United 6046 on 2026-10-24). 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 · United 723

    6:00 AM → 8:00 AM3h 00m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as United 1552; its record covers all of them.

    87%

    chance on time

    On time (history)
    96%
    Cancelled
    0.0%
    Avg arrival delay
    2 min
    • Arrived on time 96% of the time (25 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 88% on time; 3 to 6 PM: 61%).

    Limited track record · 25 flights

    Find United 723 fares Opens this date on Aviasales

  2. #2 · Republic 4774 · sold as American Eagle, Delta Connection or United Express

    7:19 PM → 9:45 PM3h 26m nonstop

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

    85%

    chance on time

    On time (history)
    100%
    Cancelled
    0.0%
    Avg arrival delay
    0 min
    • Arrived on time 100% of the time (11 flights, Jun 2025 to May 2026).

    Limited track record · 11 flights

    Find 7:19 PM flight fares Opens this date on Aviasales

  3. #3 · Republic 4391 · sold as American Eagle, Delta Connection or United Express

    6:00 AM → 8:11 AM3h 11m nonstop

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

    82%

    chance on time

    On time (history)
    80%
    Cancelled
    1.0%
    Avg arrival delay
    18 min
    • Arrived on time 80% of the time (99 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 88% on time; 3 to 6 PM: 61%).

    Moderate track record · 99 flights

    Find 6:00 AM flight fares Opens this date on Aviasales

  4. #4 · Envoy 4051 · sold as American Eagle

    7:07 AM → 9:17 AM3h 10m nonstop

    Local times, typical schedule. Last flown 2026-05-20.

    80%

    chance on time

    On time (history)
    86%
    Cancelled
    0.0%
    Avg arrival delay
    9 min
    • Arrived on time 86% of the time (44 flights, Jun 2025 to May 2026).
    • Never cancelled in 44 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 88% on time; 3 to 6 PM: 61%).

    Limited track record · 44 flights

    Find 7:07 AM flight fares Opens this date on Aviasales

  5. #5 · Republic 4488 · sold as American Eagle, Delta Connection or United Express

    12:19 PM → 2:24 PM3h 05m nonstop

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

    76%

    chance on time

    On time (history)
    64%
    Cancelled
    0.0%
    Avg arrival delay
    40 min
    • Arrived on time 64% of the time (11 flights, Jun 2025 to May 2026).
    • Lands inside ORD's trouble window: 43% of its 237 ground stops and delay programs started between 2 PM and 8 PM.
    • 81% of its delay minutes came from the plane arriving late from an earlier flight.

    Limited track record · 11 flights

    Find 12:19 PM flight fares Opens this date on Aviasales

  6. #6 · SkyWest 5985 · sold as United Express, Delta Connection, American Eagle or Alaska

    11:34 AM → 1:38 PM3h 04m nonstop

    Local times, typical schedule. Last flown 2026-05-20.

    74%

    chance on time

    On time (history)
    95%
    Cancelled
    0.0%
    Avg arrival delay
    11 min
    • Arrived on time 95% of the time (20 flights, Jun 2025 to May 2026).

    Limited track record · 20 flights

    Find 11:34 AM flight fares Opens this date on Aviasales

  7. #7 · Envoy 3474 · sold as American Eagle

    6:01 PM → 8:14 PM3h 13m nonstop

    Local times, typical schedule. Last flown 2026-05-20.

    72%

    chance on time

    On time (history)
    78%
    Cancelled
    6.8%
    Avg arrival delay
    28 min
    • Arrived on time 78% of the time (69 flights, Jun 2025 to May 2026).
    • Cancelled 6.8% of the time (5 of 74).

    Moderate track record · 69 flights

    Find 6:01 PM flight fares Opens this date on Aviasales

  8. #8 · United 637

    4:56 PM → 6:56 PM3h 00m nonstop

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

    65%

    chance on time

    On time (history)
    91%
    Cancelled
    0.0%
    Avg arrival delay
    4 min
    • Arrived on time 91% of the time (11 flights, Jun 2025 to May 2026).
    • Leaves in this route's least on-time window (3 to 6 PM: 61% on time; Before 9 AM: 88%).
    • Lands inside ORD's trouble window: 43% of its 237 ground stops and delay programs started between 2 PM and 8 PM.

    Limited track record · 11 flights

    Find United 637 fares Opens this date on Aviasales

  9. #9 · SkyWest 5784 · sold as United Express, Delta Connection, American Eagle or Alaska

    6:25 PM → 8:34 PM3h 09m nonstop

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

    65%

    chance on time

    On time (history)
    91%
    Cancelled
    0.0%
    Avg arrival delay
    3 min
    • Arrived on time 91% of the time (11 flights, Jun 2025 to May 2026).

    Limited track record · 11 flights

    Find 6:25 PM flight fares Opens this date on Aviasales

  10. #10 · United 1828

    4:50 PM → 6:48 PM2h 58m nonstop

    Local times, typical schedule. Last flown 2026-05-20.

    62%

    chance on time

    On time (history)
    76%
    Cancelled
    0.0%
    Avg arrival delay
    20 min
    • Arrived on time 76% of the time (21 flights, Jun 2025 to May 2026).
    • Leaves in this route's least on-time window (3 to 6 PM: 61% on time; Before 9 AM: 88%).
    • Lands inside ORD's trouble window: 43% of its 237 ground stops and delay programs started between 2 PM and 8 PM.

    Limited track record · 21 flights

    Find United 1828 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • Republic Airways (sold as American Eagle, Delta Connection or United Express)79%

    525 flights · 82% on time as flown · 2.5% cancel

  • Envoy Air (sold as American Eagle)77%

    206 flights · 83% on time as flown · 3.1% cancel

  • United Airlines73%

    428 flights · 75% on time as flown · 2.3% cancel

  • SkyWest Airlines (sold as United Express, Delta Connection, American Eagle or Alaska)65%

    302 flights · 65% on time as flown · 3.6% cancel

On time by departure time

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

  • Before 9 AM88%

    477 flights · avg delay 14 min

  • 9 AM to noon87%

    136 flights · avg delay 11 min

  • Noon to 3 PM87%

    143 flights · avg delay 8 min

  • 3 to 6 PM61%

    514 flights · avg delay 34 min

  • 6 to 9 PM72%

    191 flights · avg delay 22 min

Best day: Wednesday (81%). Worst: Sunday (76%).

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
88
M
78
A
86
M
87
J
75
J
72
A
72
S
80
O
79
N
80
D
83

What delays this route

  • Air traffic control and airport volume38%
  • Airline (crew, maintenance, boarding)35%
  • Late-arriving aircraft19%
  • Severe weather8%

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 ORD…

PWM to ORD questions

What time of day is best to fly PWM to ORD?
Before 9 AM: 88% of flights arrived on time, against 61% 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 ORD?
Republic, with a season-adjusted 79% chance of operating and arriving on time over 525 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 ORD?
July (72% on time); the best was February (88%), 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