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ATIS Alerts Smart Flight Search

Find the flight least likely to be delayed

Beta

We rank real flight numbers by how often they flew and arrived on time over the last 12 months, adjusted for your travel month and departure time, then check nearby airports and calmer connections. US airlines and airports.

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%).

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