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Route on-time record

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

Chicago (Chicago O'Hare International Airport) to Philadelphia (Philadelphia International Airport). 4,818 nonstop flights in Jun 2025 to May 2026, 71% arrived within 15 minutes and 2.8% were cancelled. The most reliable flight number was United 729 at 7:00 AM.

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

ORD → PHL

Chicago to Philadelphia: 4,818 nonstop flights a year

On time (12 months)

71%

Cancelled

2.8%

avg delay 28 min

Best time to leave

Before 9 AM

83% on time vs 60% 3 to 6 PM

Most reliable airline

United

71% chance on time

Check ORD to PHL fares

Lowest nonstop fare seen in the next two months: $61 (Frontier 2112 on 2026-11-05). 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 729

    7:00 AM → 10:14 AM2h 14m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as United 2038; its record covers all of them.

    85%

    chance on time

    On time (history)
    90%
    Cancelled
    0.0%
    Avg arrival delay
    17 min
    • Arrived on time 90% of the time (42 flights, Jun 2025 to May 2026).
    • Never cancelled in 42 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 83% on time; 3 to 6 PM: 60%).
    • 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 · 42 flights

    Find United 729 fares Opens this date on Aviasales

  2. #2 · United 2288

    7:15 AM → 10:28 AM2h 13m nonstop

    Local times, typical schedule. Last flown 2026-04-27. Same departure also flew as United 2001; its record covers all of them.

    84%

    chance on time

    On time (history)
    84%
    Cancelled
    0.0%
    Avg arrival delay
    12 min
    • Arrived on time 84% of the time (37 flights, Jun 2025 to May 2026).
    • Never cancelled in 37 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 83% on time; 3 to 6 PM: 60%).
    • 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 · 37 flights

    Find United 2288 fares Opens this date on Aviasales

  3. #3 · American 2970

    5:00 AM → 8:02 AM2h 02m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as American 1886; its record covers all of them.

    83%

    chance on time

    On time (history)
    88%
    Cancelled
    3.9%
    Avg arrival delay
    26 min
    • Arrived on time 88% of the time (195 flights, Jun 2025 to May 2026).
    • Cancelled 3.9% of the time (8 of 203).
    • Leaves in this route's most on-time window (Before 9 AM: 83% on time; 3 to 6 PM: 60%).
    • 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 · 195 flights

    Find American 2970 fares Opens this date on Aviasales

  4. #4 · United 2418

    9:04 AM → 12:17 PM2h 13m nonstop

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

    82%

    chance on time

    On time (history)
    84%
    Cancelled
    1.4%
    Avg arrival delay
    12 min
    • Arrived on time 84% of the time (288 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).

    Strong track record · 288 flights

    Find United 2418 fares Opens this date on Aviasales

  5. #5 · United 2182

    11:05 AM → 2:16 PM2h 11m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as United 1044; its record covers all of them.

    77%

    chance on time

    On time (history)
    78%
    Cancelled
    0.3%
    Avg arrival delay
    17 min
    • Arrived on time 78% of the time (342 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).
    • Lands inside PHL's trouble window: 72% of its 95 ground stops and delay programs started between 2 PM and 8 PM.

    Strong track record · 342 flights

    Find United 2182 fares Opens this date on Aviasales

  6. #6 · American 2115

    6:40 AM → 9:46 AM2h 06m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as American 1652, 2236; its record covers all of them.

    77%

    chance on time

    On time (history)
    81%
    Cancelled
    3.6%
    Avg arrival delay
    30 min
    • Arrived on time 81% of the time (108 flights, Jun 2025 to May 2026).
    • Cancelled 3.6% of the time (4 of 112).
    • Leaves in this route's most on-time window (Before 9 AM: 83% on time; 3 to 6 PM: 60%).
    • 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 · 108 flights

    Find American 2115 fares Opens this date on Aviasales

  7. #7 · American 471

    5:45 PM → 8:58 PM2h 13m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as American 1749; its record covers all of them.

    74%

    chance on time

    On time (history)
    77%
    Cancelled
    1.9%
    Avg arrival delay
    18 min
    • Arrived on time 77% of the time (212 flights, Jun 2025 to May 2026).
    • Leaves in this route's least on-time window (3 to 6 PM: 60% on time; Before 9 AM: 83%).
    • Departs inside ORD's trouble window: 44% of its 243 ground stops and delay programs started between 2 PM and 8 PM.

    Strong track record · 212 flights

    Find American 471 fares Opens this date on Aviasales

  8. #8 · American 2098

    8:30 AM → 11:39 AM2h 09m nonstop

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

    74%

    chance on time

    On time (history)
    79%
    Cancelled
    0.0%
    Avg arrival delay
    15 min
    • Arrived on time 79% of the time (48 flights, Jun 2025 to May 2026).
    • Never cancelled in 48 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 83% on time; 3 to 6 PM: 60%).
    • 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 · 48 flights

    Find American 2098 fares Opens this date on Aviasales

  9. #9 · United 1884

    9:48 PM → 12:59 AM2h 11m nonstop

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

    71%

    chance on time

    On time (history)
    91%
    Cancelled
    0.0%
    Avg arrival delay
    9 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 United 1884 fares Opens this date on Aviasales

  10. #10 · United 2430

    2:20 PM → 5:32 PM2h 12m nonstop

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

    69%

    chance on time

    On time (history)
    71%
    Cancelled
    0.0%
    Avg arrival delay
    29 min
    • Arrived on time 71% of the time (86 flights, Jun 2025 to May 2026).
    • Never cancelled in 87 scheduled flights.
    • Departs inside ORD's trouble window: 44% of its 243 ground stops and delay programs started between 2 PM and 8 PM.
    • Lands inside PHL's trouble window: 72% of its 95 ground stops and delay programs started between 2 PM and 8 PM.

    Moderate track record · 86 flights

    Find United 2430 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • United Airlines71%

    1,718 flights · 72% on time as flown · 1.3% cancel

  • American Airlines68%

    2,892 flights · 70% on time as flown · 3.6% cancel

  • Frontier Airlines59%

    183 flights · 58% on time as flown · 3.0% cancel

On time by departure time

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

  • Before 9 AM83%

    1,276 flights · avg delay 17 min

  • 9 AM to noon74%

    903 flights · avg delay 21 min

  • Noon to 3 PM67%

    837 flights · avg delay 35 min

  • 3 to 6 PM60%

    479 flights · avg delay 40 min

  • 6 to 9 PM61%

    999 flights · avg delay 36 min

  • After 9 PM65%

    324 flights · avg delay 32 min

Best day: Saturday (76%). Worst: Sunday (70%).

Smarter routing

Nearby airports that run more on time

  • MDW → PHL 74% chance on time

    Chicago Midway International Airport to Philadelphia International Airport · 1,530 flights a year · 15 mi from your airports · yours: 69%

    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
72
F
81
M
71
A
77
M
70
J
67
J
60
A
68
S
74
O
82
N
78
D
73

What delays this route

  • Late-arriving aircraft47%
  • Airline (crew, maintenance, boarding)29%
  • Air traffic control and airport volume18%
  • 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

ORD to PHL questions

What time of day is best to fly ORD to PHL?
Before 9 AM: 83% of flights arrived on time, against 60% 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 PHL?
United, with a season-adjusted 71% chance of operating and arriving on time over 1,718 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 PHL?
July (60% on time); the best was October (82%), 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