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Route on-time record

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

Houston (George Bush Intercontinental Airport) to Chicago (Chicago O'Hare International Airport). 6,063 nonstop flights in Jun 2025 to May 2026, 75% arrived within 15 minutes and 1.5% were cancelled. The most reliable flight number was United 1044 at 5:00 AM.

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

IAH → ORD

Houston to Chicago: 6,063 nonstop flights a year

On time (12 months)

75%

Cancelled

1.5%

avg delay 22 min

Best time to leave

Before 9 AM

88% on time vs 56% 3 to 6 PM

Most reliable airline

United

78% chance on time

Check IAH to ORD 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 · United 1044

    5:00 AM → 7:46 AM2h 46m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as United 1994; its record covers all of them.

    93%

    chance on time

    On time (history)
    95%
    Cancelled
    0.0%
    Avg arrival delay
    3 min
    • Arrived on time 95% of the time (98 flights, Jun 2025 to May 2026).
    • Never cancelled in 99 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 88% on time; 3 to 6 PM: 56%).
    • Departs outside IAH's trouble window (noon to 6 PM, when 60% of its 92 ground stops and delay programs started).

    Moderate track record · 98 flights

    Find United 1044 fares Opens this date on Aviasales

  2. #2 · United 2182

    7:20 AM → 10:05 AM2h 45m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as United 284; its record covers all of them.

    88%

    chance on time

    On time (history)
    89%
    Cancelled
    0.8%
    Avg arrival delay
    8 min
    • Arrived on time 89% of the time (360 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: 56%).
    • Departs outside IAH's trouble window (noon to 6 PM, when 60% of its 92 ground stops and delay programs started).

    Strong track record · 360 flights

    Find United 2182 fares Opens this date on Aviasales

  3. #3 · United 1617

    8:23 AM → 11:07 AM2h 45m nonstop

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

    88%

    chance on time

    On time (history)
    90%
    Cancelled
    0.4%
    Avg arrival delay
    6 min
    • Arrived on time 90% of the time (227 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: 56%).
    • Departs outside IAH's trouble window (noon to 6 PM, when 60% of its 92 ground stops and delay programs started).

    Strong track record · 227 flights

    Find United 1617 fares Opens this date on Aviasales

  4. #4 · United 2616

    6:15 AM → 9:00 AM2h 45m nonstop

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

    87%

    chance on time

    On time (history)
    88%
    Cancelled
    0.8%
    Avg arrival delay
    6 min
    • Arrived on time 88% of the time (360 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: 56%).
    • Departs outside IAH's trouble window (noon to 6 PM, when 60% of its 92 ground stops and delay programs started).

    Strong track record · 360 flights

    Find United 2616 fares Opens this date on Aviasales

  5. #5 · United 2124

    10:07 AM → 12:57 PM2h 50m nonstop

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

    85%

    chance on time

    On time (history)
    86%
    Cancelled
    0.3%
    Avg arrival delay
    10 min
    • Arrived on time 86% of the time (348 flights, Jun 2025 to May 2026).
    • Departs outside IAH's trouble window (noon to 6 PM, when 60% of its 92 ground stops and delay programs started).

    Strong track record · 348 flights

    Find United 2124 fares Opens this date on Aviasales

  6. #6 · United 1338

    10:45 PM → 1:27 AM2h 42m nonstop

    Local times, typical schedule. Last flown 2026-05-20. Same departure also flew as United 2449; its record covers all of them.

    82%

    chance on time

    On time (history)
    90%
    Cancelled
    6.5%
    Avg arrival delay
    8 min
    • Arrived on time 90% of the time (29 flights, Jun 2025 to May 2026).
    • Cancelled 6.5% of the time (2 of 31).
    • Departs outside IAH's trouble window (noon to 6 PM, when 60% of its 92 ground stops and delay programs started).
    • Short track record (29 flights), so its score leans on the airline's record at this hour.

    Limited track record · 29 flights

    Find United 1338 fares Opens this date on Aviasales

  7. #7 · Envoy 3566 · sold as American Eagle

    7:59 AM → 10:45 AM2h 46m nonstop

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

    82%

    chance on time

    On time (history)
    77%
    Cancelled
    0.0%
    Avg arrival delay
    19 min
    • Arrived on time 77% of the time (30 flights, Jun 2025 to May 2026).
    • Never cancelled in 30 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 88% on time; 3 to 6 PM: 56%).
    • Departs outside IAH's trouble window (noon to 6 PM, when 60% of its 92 ground stops and delay programs started).

    Limited track record · 30 flights

    Find 7:59 AM flight fares Opens this date on Aviasales

  8. #8 · American 3106

    6:04 AM → 8:56 AM2h 52m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as American 1212; its record covers all of them.

    79%

    chance on time

    On time (history)
    82%
    Cancelled
    5.1%
    Avg arrival delay
    32 min
    • Arrived on time 82% of the time (169 flights, Jun 2025 to May 2026).
    • Cancelled 5.1% of the time (9 of 178).
    • Leaves in this route's most on-time window (Before 9 AM: 88% on time; 3 to 6 PM: 56%).
    • Departs outside IAH's trouble window (noon to 6 PM, when 60% of its 92 ground stops and delay programs started).

    Moderate track record · 169 flights

    Find American 3106 fares Opens this date on Aviasales

  9. #9 · United 2827

    2:37 PM → 5:33 PM2h 56m nonstop

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

    78%

    chance on time

    On time (history)
    91%
    Cancelled
    0.0%
    Avg arrival delay
    19 min
    • Arrived on time 91% of the time (11 flights, Jun 2025 to May 2026).
    • Departs inside IAH's trouble window: 60% of its 92 ground stops and delay programs started between noon and 6 PM.
    • Lands inside ORD's trouble window: 44% of its 243 ground stops and delay programs started between 2 PM and 8 PM.
    • Short track record (11 flights), so its score leans on the airline's record at this hour.

    Limited track record · 11 flights

    Find United 2827 fares Opens this date on Aviasales

  10. #10 · United 2417

    11:55 AM → 2:45 PM2h 50m nonstop

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

    77%

    chance on time

    On time (history)
    77%
    Cancelled
    0.6%
    Avg arrival delay
    16 min
    • Arrived on time 77% of the time (325 flights, Jun 2025 to May 2026).
    • Departs outside IAH's trouble window (noon to 6 PM, when 60% of its 92 ground stops and delay programs started).
    • Lands inside ORD's trouble window: 44% of its 243 ground stops and delay programs started between 2 PM and 8 PM.

    Strong track record · 325 flights

    Find United 2417 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • United Airlines78%

    3,981 flights · 78% on time as flown · 0.8% cancel

  • Republic Airways (sold as American Eagle, Delta Connection or United Express)71%

    339 flights · 72% on time as flown · 2.3% cancel

  • Envoy Air (sold as American Eagle)71%

    385 flights · 72% on time as flown · 1.2% cancel

  • American Airlines67%

    775 flights · 68% on time as flown · 2.7% cancel

  • Spirit Airlines64%

    344 flights · 64% on time as flown · 3.7% cancel

  • Frontier Airlines63%

    233 flights · 61% on time as flown · 2.4% cancel

On time by departure time

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

  • Before 9 AM88%

    1,892 flights · avg delay 12 min

  • 9 AM to noon78%

    1,085 flights · avg delay 19 min

  • Noon to 3 PM72%

    825 flights · avg delay 22 min

  • 3 to 6 PM56%

    739 flights · avg delay 30 min

  • 6 to 9 PM63%

    1,121 flights · avg delay 35 min

  • After 9 PM76%

    401 flights · avg delay 24 min

Best day: Wednesday (79%). Worst: Sunday (74%).

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
79
F
86
M
75
A
78
M
70
J
68
J
66
A
76
S
85
O
84
N
81
D
79

What delays this route

  • Late-arriving aircraft41%
  • Air traffic control and airport volume31%
  • Airline (crew, maintenance, boarding)23%
  • Severe weather6%

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

IAH to ORD questions

What time of day is best to fly IAH to ORD?
Before 9 AM: 88% of flights arrived on time, against 56% 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 IAH to ORD?
United, with a season-adjusted 78% chance of operating and arriving on time over 3,981 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 IAH to ORD?
July (66% on time); the best was February (86%), 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 IAH

Live status: FAA delays and ground stops