Route on-time record
ALO to ORD: most on-time flights and the best time to fly
Waterloo (Waterloo Regional Airport) to Chicago (Chicago O'Hare International Airport). 663 nonstop flights in Jun 2025 to May 2026, 72% arrived within 15 minutes and 2.3% were cancelled. The most reliable flight number was Envoy 4322 at 5:40 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
ALO → ORD
Waterloo to Chicago: 663 nonstop flights a year
On time (12 months)
72%
Cancelled
2.3%
avg delay 28 min
Best time to leave
Before 9 AM
82% on time vs 57% 3 to 6 PM
Most reliable airline
Envoy
71% chance on time
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 · Envoy 4322 · sold as American Eagle
5:40 AM → 7:15 AM1h 25m nonstop
Local times, typical schedule. Last flown 2026-05-31.
80%
chance on time
- On time (history)
- 82%
- Cancelled
- 2.5%
- Avg arrival delay
- 27 min
- Arrived on time 82% of the time (351 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 82% on time; 3 to 6 PM: 57%).
Strong track record · 351 flights
Find 5:40 AM flight fares Opens this date on Aviasales#2 · Envoy 4326 · sold as American Eagle
2:23 PM → 3:54 PM1h 31m nonstop
Local times, typical schedule. Last flown 2026-05-31.
61%
chance on time
- On time (history)
- 61%
- Cancelled
- 2.0%
- Avg arrival delay
- 30 min
- Arrived on time 61% of the time (295 flights, Jun 2025 to May 2026).
- Lands inside ORD's trouble window: 44% of its 243 ground stops and delay programs started between 2 PM and 8 PM.
- 52% of its delay minutes came from the plane arriving late from an earlier flight.
Strong track record · 295 flights
Find 2:23 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%
663 flights · 72% on time as flown · 2.3% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM82%
358 flights · avg delay 26 min
- Noon to 3 PM82%
45 flights · avg delay 30 min
- 3 to 6 PM57%
258 flights · avg delay 30 min
Best day: Saturday (82%). Worst: Monday (67%).
On time by month
All airlines, Jun 2025 to May 2026. One year of data, so a single stormy month can stand out.
What delays this route
- Late-arriving aircraft33%
- Severe weather26%
- Airline (crew, maintenance, boarding)24%
- Air traffic control and airport volume17%
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
ALO to ORD questions
- What time of day is best to fly ALO to ORD?
- Before 9 AM: 82% of flights arrived on time, against 57% 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 ALO to ORD?
- Envoy, with a season-adjusted 71% chance of operating and arriving on time over 663 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 ALO to ORD?
- December (59% on time); the best was May (86%), 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 ALO
Live status: FAA delays and ground stops