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Route on-time record

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

Boston (Boston Logan International Airport) to Chicago (Chicago O'Hare International Airport). 7,556 nonstop flights in Jun 2025 to May 2026, 72% arrived within 15 minutes and 2.7% were cancelled. The most reliable flight number was United 1414 at 6:00 AM.

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

BOS → ORD

Boston to Chicago: 7,556 nonstop flights a year

On time (12 months)

72%

Cancelled

2.7%

avg delay 24 min

Best time to leave

Before 9 AM

88% on time vs 48% 6 to 9 PM

Most reliable airline

United

73% chance on time

Check BOS to ORD fares

Lowest nonstop fare seen in the next two months: $88 (JetBlue 111 on 2026-11-04). 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 1414

    6:00 AM → 8:00 AM2h 59m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as United 1712; its record covers all of them.

    92%

    chance on time

    On time (history)
    94%
    Cancelled
    2.3%
    Avg arrival delay
    4 min
    • Arrived on time 94% of the time (342 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 88% on time; 6 to 9 PM: 48%).
    • Departs outside BOS's trouble window (noon to 6 PM, when 79% of its 196 ground stops and delay programs started).

    Strong track record · 342 flights

    Find United 1414 fares Opens this date on Aviasales

  2. #2 · American 1509

    6:30 AM → 8:44 AM3h 14m nonstop

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

    92%

    chance on time

    On time (history)
    93%
    Cancelled
    0.5%
    Avg arrival delay
    7 min
    • Arrived on time 93% of the time (204 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 88% on time; 6 to 9 PM: 48%).
    • Departs outside BOS's trouble window (noon to 6 PM, when 79% of its 196 ground stops and delay programs started).

    Strong track record · 204 flights

    Find American 1509 fares Opens this date on Aviasales

  3. #3 · American 2114

    8:03 AM → 10:12 AM3h 09m nonstop

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

    88%

    chance on time

    On time (history)
    95%
    Cancelled
    0.0%
    Avg arrival delay
    4 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: 88% on time; 6 to 9 PM: 48%).
    • Departs outside BOS's trouble window (noon to 6 PM, when 79% of its 196 ground stops and delay programs started).

    Limited track record · 44 flights

    Find American 2114 fares Opens this date on Aviasales

  4. #4 · American 3324

    5:05 AM → 7:02 AM2h 57m nonstop

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

    88%

    chance on time

    On time (history)
    92%
    Cancelled
    1.6%
    Avg arrival delay
    4 min
    • Arrived on time 92% of the time (122 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 88% on time; 6 to 9 PM: 48%).
    • Departs outside BOS's trouble window (noon to 6 PM, when 79% of its 196 ground stops and delay programs started).

    Moderate track record · 122 flights

    Find American 3324 fares Opens this date on Aviasales

  5. #5 · United 1170

    8:05 AM → 10:06 AM3h 01m nonstop

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

    88%

    chance on time

    On time (history)
    100%
    Cancelled
    0.0%
    Avg arrival delay
    1 min
    • Arrived on time 100% of the time (12 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 88% on time; 6 to 9 PM: 48%).
    • Departs outside BOS's trouble window (noon to 6 PM, when 79% of its 196 ground stops and delay programs started).
    • Short track record (12 flights), so its score leans on the airline's record at this hour.

    Limited track record · 12 flights

    Find United 1170 fares Opens this date on Aviasales

  6. #6 · United 1834

    8:15 AM → 10:12 AM2h 57m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as United 2744; its record covers all of them.

    87%

    chance on time

    On time (history)
    96%
    Cancelled
    4.2%
    Avg arrival delay
    13 min
    • Arrived on time 96% of the time (23 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 88% on time; 6 to 9 PM: 48%).
    • Departs outside BOS's trouble window (noon to 6 PM, when 79% of its 196 ground stops and delay programs started).
    • Short track record (23 flights), so its score leans on the airline's record at this hour.

    Limited track record · 23 flights

    Find United 1834 fares Opens this date on Aviasales

  7. #7 · American 1239

    8:37 AM → 10:40 AM3h 03m nonstop

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

    87%

    chance on time

    On time (history)
    88%
    Cancelled
    0.0%
    Avg arrival delay
    10 min
    • Arrived on time 88% of the time (161 flights, Jun 2025 to May 2026).
    • Never cancelled in 161 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 88% on time; 6 to 9 PM: 48%).
    • Departs outside BOS's trouble window (noon to 6 PM, when 79% of its 196 ground stops and delay programs started).

    Moderate track record · 161 flights

    Find American 1239 fares Opens this date on Aviasales

  8. #8 · American 1328

    6:52 AM → 9:03 AM3h 11m nonstop

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

    86%

    chance on time

    On time (history)
    90%
    Cancelled
    6.4%
    Avg arrival delay
    7 min
    • Arrived on time 90% of the time (116 flights, Jun 2025 to May 2026).
    • Cancelled 6.4% of the time (8 of 125).
    • Leaves in this route's most on-time window (Before 9 AM: 88% on time; 6 to 9 PM: 48%).
    • Departs outside BOS's trouble window (noon to 6 PM, when 79% of its 196 ground stops and delay programs started).

    Moderate track record · 116 flights

    Find American 1328 fares Opens this date on Aviasales

  9. #9 · United 366

    7:19 AM → 9:17 AM2h 58m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as United 2488; its record covers all of them.

    85%

    chance on time

    On time (history)
    88%
    Cancelled
    0.0%
    Avg arrival delay
    6 min
    • Arrived on time 88% of the time (57 flights, Jun 2025 to May 2026).
    • Never cancelled in 58 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 88% on time; 6 to 9 PM: 48%).
    • Departs outside BOS's trouble window (noon to 6 PM, when 79% of its 196 ground stops and delay programs started).

    Limited track record · 57 flights

    Find United 366 fares Opens this date on Aviasales

  10. #10 · American 2976

    12:22 PM → 2:25 PM3h 03m nonstop

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

    84%

    chance on time

    On time (history)
    93%
    Cancelled
    0.0%
    Avg arrival delay
    4 min
    • Arrived on time 93% of the time (44 flights, Jun 2025 to May 2026).
    • Never cancelled in 44 scheduled flights.
    • Departs inside BOS's trouble window: 79% of its 196 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.

    Limited track record · 44 flights

    Find American 2976 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • United Airlines73%

    2,631 flights · 74% on time as flown · 1.8% cancel

  • JetBlue73%

    536 flights · 74% on time as flown · 2.2% cancel

  • Envoy Air (sold as American Eagle)73%

    450 flights · 75% on time as flown · 3.2% cancel

  • American Airlines71%

    2,098 flights · 73% on time as flown · 2.6% cancel

  • Republic Airways (sold as American Eagle, Delta Connection or United Express)65%

    880 flights · 70% on time as flown · 5.6% cancel

  • Delta Air Lines64%

    961 flights · 65% on time as flown · 2.5% cancel

On time by departure time

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

  • Before 9 AM88%

    2,066 flights · avg delay 9 min

  • 9 AM to noon82%

    1,270 flights · avg delay 16 min

  • Noon to 3 PM77%

    1,203 flights · avg delay 21 min

  • 3 to 6 PM60%

    1,899 flights · avg delay 33 min

  • 6 to 9 PM48%

    1,116 flights · avg delay 47 min

Best day: Tuesday (81%). Worst: Friday (74%).

Smarter routing

Nearby airports that run more on time

  • MHT → MDW 87% chance on time

    Manchester-Boston Regional Airport to Chicago Midway International Airport · 512 flights a year · 60 mi from your airports · yours: 70%

    Rank flightsFares

  • PVD → MDW 83% chance on time

    Rhode Island T. F. Green International Airport to Chicago Midway International Airport · 768 flights a year · 64 mi from your airports · yours: 70%

    Rank flightsFares

  • MHT → ORD 77% chance on time

    Manchester-Boston Regional Airport to Chicago O'Hare International Airport · 565 flights a year · 45 mi from your airports · yours: 70%

    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
78
F
83
M
82
A
79
M
77
J
75
J
68
A
73
S
75
O
76
N
81
D
81

What delays this route

  • Late-arriving aircraft41%
  • Air traffic control and airport volume35%
  • Airline (crew, maintenance, boarding)21%
  • Severe weather3%

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

BOS to ORD questions

What time of day is best to fly BOS to ORD?
Before 9 AM: 88% of flights arrived on time, against 48% 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 BOS to ORD?
United, with a season-adjusted 73% chance of operating and arriving on time over 2,631 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 BOS to ORD?
July (68% on time); the best was February (83%), 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 BOS

Live status: FAA delays and ground stops