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Route on-time record

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

Chicago (Chicago O'Hare International Airport) to Waterloo (Waterloo Regional Airport). 664 nonstop flights in Jun 2025 to May 2026, 73% arrived within 15 minutes and 2.4% were cancelled. The most reliable flight number was Envoy 4326 at 12:30 PM.

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

ORD → ALO

Chicago to Waterloo: 664 nonstop flights a year

On time (12 months)

73%

Cancelled

2.4%

avg delay 22 min

Best time to leave

6 to 9 PM

83% on time vs 67% after 9 PM

Most reliable airline

Envoy

71% chance on time

Check ORD to ALO 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 · Envoy 4326 · sold as American Eagle

    12:30 PM → 1:53 PM1h 23m nonstop

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

    77%

    chance on time

    On time (history)
    78%
    Cancelled
    0.6%
    Avg arrival delay
    17 min
    • Arrived on time 78% of the time (307 flights, Jun 2025 to May 2026).
    • Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).
    • 59% of its delay minutes came from the plane arriving late from an earlier flight.

    Strong track record · 307 flights

    Find 12:30 PM flight fares Opens this date on Aviasales

  2. #2 · Envoy 4321 · sold as American Eagle

    10:34 PM → 11:53 PM1h 22m nonstop

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

    66%

    chance on time

    On time (history)
    68%
    Cancelled
    4.0%
    Avg arrival delay
    26 min
    • Arrived on time 68% of the time (333 flights, Jun 2025 to May 2026).
    • Cancelled 4.0% of the time (14 of 353).
    • Leaves in this route's least on-time window (After 9 PM: 67% on time; 6 to 9 PM: 83%).
    • Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).

    Strong track record · 333 flights

    Find 10:34 PM flight fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • Envoy Air (sold as American Eagle)71%

    664 flights · 73% on time as flown · 2.4% cancel

On time by departure time

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

  • Noon to 3 PM77%

    294 flights · avg delay 18 min

  • 6 to 9 PM83%

    42 flights · avg delay 12 min

  • After 9 PM67%

    306 flights · avg delay 28 min

Best day: Saturday (86%). Worst: Thursday (68%).

On time by month

All airlines, Jun 2025 to May 2026. One year of data, so a single stormy month can stand out.

J
61
F
85
M
65
A
59
M
83
J
66
J
67
A
84
S
81
O
85
N
80
D
59

What delays this route

  • Late-arriving aircraft49%
  • Air traffic control and airport volume21%
  • Severe weather18%
  • Airline (crew, maintenance, boarding)12%

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

ORD to ALO questions

What time of day is best to fly ORD to ALO?
6 to 9 PM: 83% of flights arrived on time, against 67% for departures after 9 PM.
Which airline is most on time from ORD to ALO?
Envoy, with a season-adjusted 71% chance of operating and arriving on time over 664 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 ORD to ALO?
December (59% on time); the best was October (85%), from one year of data, so one bad storm season can move a month.
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 ORD

Live status: FAA delays and ground stops