Skip to content

All Products

Aviation Intelligence

Alerts & Airspace

Free Pilot Tools & Widgets

RC Aviation

Games & Learning

Weather Research & More

Pilot Resources

My Airports

Your shortcuts, saved on this device. Search to add an airport.

No airports saved yet. Add the fields you visit most.

Ask ATIS

Route on-time record

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

Chicago (Chicago O'Hare International Airport) to Pittsburgh (Pittsburgh International Airport). 3,910 nonstop flights in Jun 2025 to May 2026, 74% arrived within 15 minutes and 1.8% were cancelled. The most reliable flight number was Republic 3432 at 12:40 PM.

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

ORD → PIT

Chicago to Pittsburgh: 3,910 nonstop flights a year

On time (12 months)

74%

Cancelled

1.8%

avg delay 22 min

Best time to leave

Before 9 AM

86% on time vs 64% 6 to 9 PM

Most reliable airline

Republic

79% chance on time

Check ORD to PIT 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 · Republic 3432 · sold as American Eagle, Delta Connection or United Express

    12:40 PM → 3:23 PM1h 43m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Republic 3585; its record covers all of them.

    86%

    chance on time

    On time (history)
    86%
    Cancelled
    0.0%
    Avg arrival delay
    11 min
    • Arrived on time 86% of the time (42 flights, Jun 2025 to May 2026).
    • Never cancelled in 42 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 (42 flights), so its score leans on the airline's record at this hour.

    Limited track record · 42 flights

    Find 12:40 PM flight fares Opens this date on Aviasales

  2. #2 · United 1285

    7:08 AM → 9:48 AM1h 40m nonstop

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

    86%

    chance on time

    On time (history)
    87%
    Cancelled
    0.8%
    Avg arrival delay
    9 min
    • Arrived on time 87% of the time (254 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 86% on time; 6 to 9 PM: 64%).
    • 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 · 254 flights

    Find United 1285 fares Opens this date on Aviasales

  3. #3 · Republic 4481 · sold as American Eagle, Delta Connection or United Express

    8:21 AM → 11:04 AM1h 43m nonstop

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

    85%

    chance on time

    On time (history)
    89%
    Cancelled
    0.0%
    Avg arrival delay
    7 min
    • Arrived on time 89% 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: 86% on time; 6 to 9 PM: 64%).
    • 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 8:21 AM flight fares Opens this date on Aviasales

  4. #4 · Republic 4478 · sold as American Eagle, Delta Connection or United Express

    8:27 AM → 11:13 AM1h 46m nonstop

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

    84%

    chance on time

    On time (history)
    91%
    Cancelled
    0.0%
    Avg arrival delay
    18 min
    • Arrived on time 91% of the time (11 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 86% on time; 6 to 9 PM: 64%).
    • Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).
    • 99% of its delay minutes came from the plane arriving late from an earlier flight.

    Limited track record · 11 flights

    Find 8:27 AM flight fares Opens this date on Aviasales

  5. #5 · Republic 4484 · sold as American Eagle, Delta Connection or United Express

    9:45 AM → 12:32 PM1h 47m nonstop

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

    82%

    chance on time

    On time (history)
    87%
    Cancelled
    1.6%
    Avg arrival delay
    6 min
    • Arrived on time 87% of the time (62 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).

    Moderate track record · 62 flights

    Find 9:45 AM flight fares Opens this date on Aviasales

  6. #6 · Republic 4504 · sold as American Eagle, Delta Connection or United Express

    9:05 AM → 11:45 AM1h 40m nonstop

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

    81%

    chance on time

    On time (history)
    73%
    Cancelled
    0.0%
    Avg arrival delay
    45 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).
    • 63% of its delay minutes came from the plane arriving late from an earlier flight.

    Limited track record · 30 flights

    Find 9:05 AM flight fares Opens this date on Aviasales

  7. #7 · SkyWest 5717 · sold as United Express, Delta Connection, American Eagle or Alaska

    12:40 PM → 3:21 PM1h 41m nonstop

    Local times, typical schedule. Last flown 2026-05-20. Same departure also flew as SkyWest 5656; its record covers all of them.

    80%

    chance on time

    On time (history)
    90%
    Cancelled
    3.2%
    Avg arrival delay
    9 min
    • Arrived on time 90% of the time (30 flights, Jun 2025 to May 2026).
    • Cancelled 3.2% of the time (1 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 (30 flights), so its score leans on the airline's record at this hour.

    Limited track record · 30 flights

    Find 12:40 PM flight fares Opens this date on Aviasales

  8. #8 · Republic 4625 · sold as American Eagle, Delta Connection or United Express

    2:05 PM → 4:48 PM1h 43m nonstop

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

    78%

    chance on time

    On time (history)
    79%
    Cancelled
    0.0%
    Avg arrival delay
    19 min
    • Arrived on time 79% of the time (80 flights, Jun 2025 to May 2026).
    • Never cancelled in 80 scheduled flights.
    • Departs inside ORD's trouble window: 44% of its 243 ground stops and delay programs started between 2 PM and 8 PM.
    • 66% of its delay minutes came from the plane arriving late from an earlier flight.

    Moderate track record · 80 flights

    Find 2:05 PM flight fares Opens this date on Aviasales

  9. #9 · Republic 3464 · sold as American Eagle, Delta Connection or United Express

    9:20 PM → 11:59 PM1h 36m nonstop

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

    77%

    chance on time

    On time (history)
    79%
    Cancelled
    3.7%
    Avg arrival delay
    16 min
    • Arrived on time 79% of the time (337 flights, Jun 2025 to May 2026).
    • Cancelled 3.7% of the time (13 of 350).
    • 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 · 337 flights

    Find 9:20 PM flight fares Opens this date on Aviasales

  10. #10 · United 567

    10:35 AM → 1:09 PM1h 35m nonstop

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

    75%

    chance on time

    On time (history)
    74%
    Cancelled
    1.4%
    Avg arrival delay
    16 min
    • Arrived on time 74% of the time (136 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).

    Moderate track record · 136 flights

    Find United 567 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)79%

    1,548 flights · 81% on time as flown · 1.9% cancel

  • Envoy Air (sold as American Eagle)79%

    246 flights · 83% on time as flown · 1.9% cancel

  • United Airlines74%

    1,265 flights · 75% on time as flown · 1.0% cancel

  • SkyWest Airlines (sold as United Express, Delta Connection, American Eagle or Alaska)65%

    252 flights · 65% on time as flown · 2.2% cancel

  • American Airlines57%

    599 flights · 55% on time as flown · 2.5% cancel

On time by departure time

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

  • Before 9 AM86%

    535 flights · avg delay 11 min

  • 9 AM to noon80%

    623 flights · avg delay 16 min

  • Noon to 3 PM76%

    953 flights · avg delay 16 min

  • 3 to 6 PM66%

    490 flights · avg delay 31 min

  • 6 to 9 PM64%

    865 flights · avg delay 35 min

  • After 9 PM77%

    444 flights · avg delay 19 min

Best day: Tuesday (82%). Worst: Sunday (74%).

Smarter routing

Nearby airports that run more on time

  • MDW → PIT 79% chance on time

    Chicago Midway International Airport to Pittsburgh International Airport · 1,148 flights a year · 15 mi from your airports · yours: 73%

    Rank flightsFares

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
75
F
82
M
76
A
80
M
80
J
72
J
69
A
76
S
84
O
82
N
80
D
75

What delays this route

  • Late-arriving aircraft52%
  • Airline (crew, maintenance, boarding)26%
  • Air traffic control and airport volume14%
  • Severe weather8%

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 PIT questions

What time of day is best to fly ORD to PIT?
Before 9 AM: 86% of flights arrived on time, against 64% 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 PIT?
Republic, with a season-adjusted 79% chance of operating and arriving on time over 1,548 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 PIT?
July (69% on time); the best was September (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