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Route on-time record

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

Chicago (Chicago O'Hare International Airport) to Green Bay (Austin Straubel International Airport). 2,840 nonstop flights in Jun 2025 to May 2026, 68% arrived within 15 minutes and 3.9% were cancelled. The most reliable flight number was Envoy 3614 at 8:00 AM.

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

ORD → GRB

Chicago to Green Bay: 2,840 nonstop flights a year

On time (12 months)

68%

Cancelled

3.9%

avg delay 25 min

Best time to leave

Before 9 AM

80% on time vs 61% 3 to 6 PM

Most reliable airline

Republic

72% chance on time

Check ORD to GRB 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 3614 · sold as American Eagle

    8:00 AM → 9:12 AM1h 12m nonstop

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

    87%

    chance on time

    On time (history)
    95%
    Cancelled
    0.0%
    Avg arrival delay
    3 min
    • Arrived on time 95% 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: 80% on time; 3 to 6 PM: 61%).
    • Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).

    Limited track record · 44 flights

    Find 8:00 AM flight fares Opens this date on Aviasales

  2. #2 · Envoy 4309 · sold as American Eagle

    8:21 AM → 9:27 AM1h 06m nonstop

    Local times, typical schedule. Last flown 2026-04-06.

    82%

    chance on time

    On time (history)
    89%
    Cancelled
    6.7%
    Avg arrival delay
    6 min
    • Arrived on time 89% of the time (28 flights, Jun 2025 to May 2026).
    • Cancelled 6.7% of the time (2 of 30).
    • Leaves in this route's most on-time window (Before 9 AM: 80% on time; 3 to 6 PM: 61%).
    • Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).

    Limited track record · 28 flights

    Find 8:21 AM flight fares Opens this date on Aviasales

  3. #3 · Envoy 3415 · sold as American Eagle

    10:31 AM → 11:45 AM1h 14m nonstop

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

    77%

    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).
    • Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).
    • Short track record (11 flights), so its score leans on the airline's record at this hour.

    Limited track record · 11 flights

    Find 10:31 AM flight fares Opens this date on Aviasales

  4. #4 · Envoy 3613 · sold as American Eagle

    3:40 PM → 4:54 PM1h 14m nonstop

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

    72%

    chance on time

    On time (history)
    77%
    Cancelled
    0.0%
    Avg arrival delay
    18 min
    • Arrived on time 77% of the time (44 flights, Jun 2025 to May 2026).
    • Never cancelled in 44 scheduled flights.
    • Leaves in this route's least on-time window (3 to 6 PM: 61% on time; Before 9 AM: 80%).
    • Departs inside ORD's trouble window: 44% of its 243 ground stops and delay programs started between 2 PM and 8 PM.

    Limited track record · 44 flights

    Find 3:40 PM flight fares Opens this date on Aviasales

  5. #5 · Envoy 3543 · sold as American Eagle

    1:14 PM → 2:25 PM1h 11m nonstop

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

    71%

    chance on time

    On time (history)
    73%
    Cancelled
    0.0%
    Avg arrival delay
    16 min
    • Arrived on time 73% of the time (11 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).
    • 52% of its delay minutes came from the plane arriving late from an earlier flight.
    • Short track record (11 flights), so its score leans on the airline's record at this hour.

    Limited track record · 11 flights

    Find 1:14 PM flight fares Opens this date on Aviasales

  6. #6 · SkyWest 5321 · sold as United Express, Delta Connection, American Eagle or Alaska

    8:40 AM → 10:00 AM1h 20m nonstop

    Local times, typical schedule. Last flown 2026-04-29. Same departure also flew as SkyWest 5545; its record covers all of them.

    70%

    chance on time

    On time (history)
    71%
    Cancelled
    6.2%
    Avg arrival delay
    25 min
    • Arrived on time 71% of the time (106 flights, Jun 2025 to May 2026).
    • Cancelled 6.2% of the time (7 of 113).
    • Leaves in this route's most on-time window (Before 9 AM: 80% on time; 3 to 6 PM: 61%).
    • Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).

    Moderate track record · 106 flights

    Find 8:40 AM flight fares Opens this date on Aviasales

  7. #7 · Republic 3713 · sold as American Eagle, Delta Connection or United Express

    10:50 PM → 11:57 PM1h 07m nonstop

    Local times, typical schedule. Last flown 2026-04-27.

    69%

    chance on time

    On time (history)
    64%
    Cancelled
    12.5%
    Avg arrival delay
    47 min
    • Arrived on time 64% of the time (14 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).
    • Short track record (14 flights), so its score leans on the airline's record at this hour.

    Limited track record · 14 flights

    Find 10:50 PM flight fares Opens this date on Aviasales

  8. #8 · Envoy 4208 · sold as American Eagle

    8:39 PM → 9:58 PM1h 19m nonstop

    Local times, typical schedule. Last flown 2026-05-06.

    69%

    chance on time

    On time (history)
    73%
    Cancelled
    0.0%
    Avg arrival delay
    36 min
    • Arrived on time 73% of the time (30 flights, Jun 2025 to May 2026).
    • Never cancelled in 30 scheduled flights.
    • Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).
    • Short track record (30 flights), so its score leans on the airline's record at this hour.

    Limited track record · 30 flights

    Find 8:39 PM flight fares Opens this date on Aviasales

  9. #9 · SkyWest 5839 · sold as United Express, Delta Connection, American Eagle or Alaska

    10:35 AM → 11:59 AM1h 24m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as SkyWest 5663; its record covers all of them.

    68%

    chance on time

    On time (history)
    82%
    Cancelled
    12.0%
    Avg arrival delay
    19 min
    • Arrived on time 82% of the time (22 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).
    • Short track record (22 flights), so its score leans on the airline's record at this hour.

    Limited track record · 22 flights

    Find 10:35 AM flight fares Opens this date on Aviasales

  10. #10 · Envoy 3402 · sold as American Eagle

    10:29 PM → 11:32 PM1h 03m nonstop

    Local times, typical schedule. Last flown 2026-04-06.

    66%

    chance on time

    On time (history)
    67%
    Cancelled
    20.0%
    Avg arrival delay
    13 min
    • Arrived on time 67% of the time (24 flights, Jun 2025 to May 2026).
    • Cancelled 20.0% of the time (6 of 30).
    • Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).
    • Short track record (24 flights), so its score leans on the airline's record at this hour.

    Limited track record · 24 flights

    Find 10:29 PM flight 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)72%

    189 flights · 81% on time as flown · 4.1% cancel

  • Envoy Air (sold as American Eagle)70%

    1,371 flights · 73% on time as flown · 3.5% cancel

  • SkyWest Airlines (sold as United Express, Delta Connection, American Eagle or Alaska)60%

    1,280 flights · 61% on time as flown · 4.4% cancel

On time by departure time

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

  • Before 9 AM80%

    594 flights · avg delay 14 min

  • 9 AM to noon73%

    276 flights · avg delay 18 min

  • Noon to 3 PM71%

    385 flights · avg delay 24 min

  • 3 to 6 PM61%

    697 flights · avg delay 31 min

  • 6 to 9 PM62%

    562 flights · avg delay 35 min

  • After 9 PM66%

    326 flights · avg delay 24 min

Best day: Tuesday (77%). Worst: Sunday (67%).

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
62
F
77
M
70
A
76
M
73
J
71
J
65
A
70
S
76
O
84
N
80
D
64

What delays this route

  • Late-arriving aircraft38%
  • Airline (crew, maintenance, boarding)28%
  • Air traffic control and airport volume21%
  • Severe weather13%

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 GRB questions

What time of day is best to fly ORD to GRB?
Before 9 AM: 80% 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 ORD to GRB?
Republic, with a season-adjusted 72% chance of operating and arriving on time over 189 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 GRB?
January (62% on time); the best was October (84%), 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 ORD

Live status: FAA delays and ground stops