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Route on-time record

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

Chicago (Chicago O'Hare International Airport) to Harrisburg (Harrisburg International Airport). 2,034 nonstop flights in Jun 2025 to May 2026, 73% arrived within 15 minutes and 2.9% were cancelled. The most reliable flight number was Envoy 3741 at 1:07 PM.

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

ORD → MDT

Chicago to Harrisburg: 2,034 nonstop flights a year

On time (12 months)

73%

Cancelled

2.9%

avg delay 20 min

Best time to leave

Before 9 AM

79% on time vs 66% 6 to 9 PM

Most reliable airline

Envoy

74% chance on time

Check ORD to MDT fares

Lowest nonstop fare seen in the next two months: $173 (American 1448 on 2026-10-22). 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 3741 · sold as American Eagle

    1:07 PM → 4:06 PM1h 59m nonstop

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

    80%

    chance on time

    On time (history)
    85%
    Cancelled
    0.0%
    Avg arrival delay
    12 min
    • Arrived on time 85% of the time (39 flights, Jun 2025 to May 2026).
    • Never cancelled in 39 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 (39 flights), so its score leans on the airline's record at this hour.

    Limited track record · 39 flights

    Find 1:07 PM flight fares Opens this date on Aviasales

  2. #2 · Republic 4746 · sold as American Eagle, Delta Connection or United Express

    8:00 AM → 11:07 AM2h 07m nonstop

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

    79%

    chance on time

    On time (history)
    82%
    Cancelled
    0.0%
    Avg arrival delay
    11 min
    • Arrived on time 82% of the time (11 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 79% on time; 6 to 9 PM: 66%).
    • 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 8:00 AM flight fares Opens this date on Aviasales

  3. #3 · Republic 4640 · sold as American Eagle, Delta Connection or United Express

    8:52 PM → 11:59 PM2h 07m nonstop

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

    79%

    chance on time

    On time (history)
    100%
    Cancelled
    0.0%
    Avg arrival delay
    0 min
    • Arrived on time 100% of the time (11 flights, Jun 2025 to May 2026).
    • Leaves in this route's least on-time window (6 to 9 PM: 66% on time; Before 9 AM: 79%).
    • 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 8:52 PM flight fares Opens this date on Aviasales

  4. #4 · Republic 4732 · sold as American Eagle, Delta Connection or United Express

    8:23 AM → 11:23 AM2h 00m nonstop

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

    78%

    chance on time

    On time (history)
    77%
    Cancelled
    0.0%
    Avg arrival delay
    7 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 most on-time window (Before 9 AM: 79% on time; 6 to 9 PM: 66%).
    • 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 8:23 AM flight fares Opens this date on Aviasales

  5. #5 · Republic 3531 · sold as American Eagle, Delta Connection or United Express

    9:35 PM → 12:42 AM2h 07m nonstop

    Local times, typical schedule. Last flown 2026-04-28.

    77%

    chance on time

    On time (history)
    85%
    Cancelled
    12.9%
    Avg arrival delay
    14 min
    • Arrived on time 85% of the time (27 flights, Jun 2025 to May 2026).
    • Cancelled 12.9% of the time (4 of 31).
    • 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 (27 flights), so its score leans on the airline's record at this hour.

    Limited track record · 27 flights

    Find 9:35 PM flight fares Opens this date on Aviasales

  6. #6 · Envoy 3693 · sold as American Eagle

    9:07 AM → 12:03 PM1h 56m nonstop

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

    77%

    chance on time

    On time (history)
    79%
    Cancelled
    4.0%
    Avg arrival delay
    16 min
    • Arrived on time 79% of the time (24 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 (24 flights), so its score leans on the airline's record at this hour.

    Limited track record · 24 flights

    Find 9:07 AM flight fares Opens this date on Aviasales

  7. #7 · United 1746

    1:55 PM → 4:55 PM2h 00m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as United 564; its record covers all of them.

    75%

    chance on time

    On time (history)
    80%
    Cancelled
    5.4%
    Avg arrival delay
    13 min
    • Arrived on time 80% of the time (70 flights, Jun 2025 to May 2026).
    • Cancelled 5.4% of the time (4 of 74).
    • 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 · 70 flights

    Find United 1746 fares Opens this date on Aviasales

  8. #8 · SkyWest 5581 · sold as United Express, Delta Connection, American Eagle or Alaska

    7:05 AM → 10:07 AM1h 55m nonstop

    Local times, typical schedule. Last flown 2026-05-20. Same departure also flew as SkyWest 5556; its record covers all of them.

    71%

    chance on time

    On time (history)
    73%
    Cancelled
    2.6%
    Avg arrival delay
    19 min
    • Arrived on time 73% of the time (111 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 79% on time; 6 to 9 PM: 66%).
    • 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 · 111 flights

    Find 7:05 AM flight fares Opens this date on Aviasales

  9. #9 · American 2479

    2:58 PM → 5:50 PM1h 52m nonstop

    Local times, typical schedule. Last flown 2026-04-05.

    69%

    chance on time

    On time (history)
    74%
    Cancelled
    6.7%
    Avg arrival delay
    28 min
    • Arrived on time 74% of the time (42 flights, Jun 2025 to May 2026).
    • Cancelled 6.7% of the time (3 of 45).
    • Departs inside ORD's trouble window: 44% of its 243 ground stops and delay programs started between 2 PM and 8 PM.
    • 74% of its delay minutes came from the plane arriving late from an earlier flight.

    Limited track record · 42 flights

    Find American 2479 fares Opens this date on Aviasales

  10. #10 · American 3243

    3:04 PM → 6:01 PM1h 57m nonstop

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

    68%

    chance on time

    On time (history)
    76%
    Cancelled
    0.0%
    Avg arrival delay
    20 min
    • Arrived on time 76% of the time (55 flights, Jun 2025 to May 2026).
    • Never cancelled in 55 scheduled flights.
    • Departs inside ORD's trouble window: 44% of its 243 ground stops and delay programs started between 2 PM and 8 PM.
    • 80% of its delay minutes came from the plane arriving late from an earlier flight.

    Limited track record · 55 flights

    Find American 3243 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)74%

    797 flights · 76% on time as flown · 2.6% cancel

  • Republic Airways (sold as American Eagle, Delta Connection or United Express)74%

    233 flights · 78% on time as flown · 3.7% cancel

  • SkyWest Airlines (sold as United Express, Delta Connection, American Eagle or Alaska)69%

    274 flights · 70% on time as flown · 2.9% cancel

  • United Airlines67%

    540 flights · 69% on time as flown · 2.2% cancel

  • American Airlines64%

    190 flights · 64% on time as flown · 4.2% cancel

On time by departure time

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

  • Before 9 AM79%

    416 flights · avg delay 11 min

  • 9 AM to noon72%

    113 flights · avg delay 26 min

  • Noon to 3 PM77%

    511 flights · avg delay 18 min

  • 3 to 6 PM69%

    279 flights · avg delay 20 min

  • 6 to 9 PM66%

    618 flights · avg delay 27 min

  • After 9 PM76%

    97 flights · avg delay 16 min

Best day: Wednesday (77%). Worst: Sunday (69%).

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
68
F
76
M
74
A
76
M
76
J
71
J
65
A
75
S
80
O
85
N
81
D
71

What delays this route

  • Late-arriving aircraft46%
  • Airline (crew, maintenance, boarding)26%
  • Air traffic control and airport volume19%
  • Severe weather9%

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 MDT questions

What time of day is best to fly ORD to MDT?
Before 9 AM: 79% of flights arrived on time, against 66% for departures 6 to 9 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 MDT?
Envoy, with a season-adjusted 74% chance of operating and arriving on time over 797 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 MDT?
July (65% on time); the best was October (85%), 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