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

Chicago (Chicago O'Hare International Airport) to Boston (Boston Logan International Airport). 7,561 nonstop flights in Jun 2025 to May 2026, 68% arrived within 15 minutes and 2.6% were cancelled. The most reliable flight number was United 1076 at 7:33 AM.

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

ORD → BOS

Chicago to Boston: 7,561 nonstop flights a year

On time (12 months)

68%

Cancelled

2.6%

avg delay 26 min

Best time to leave

Before 9 AM

84% on time vs 51% 3 to 6 PM

Most reliable airline

Envoy

79% chance on time

Check ORD to BOS 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 1076

    7:33 AM → 11:05 AM2h 32m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as United 1976, 2104, 2067; its record covers all of them.

    91%

    chance on time

    On time (history)
    93%
    Cancelled
    1.1%
    Avg arrival delay
    4 min
    • Arrived on time 93% of the time (466 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 84% on time; 3 to 6 PM: 51%).
    • 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 · 466 flights

    Find United 1076 fares Opens this date on Aviasales

  2. #2 · United 1186

    6:15 AM → 9:39 AM2h 24m nonstop

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

    87%

    chance on time

    On time (history)
    100%
    Cancelled
    0.0%
    Avg arrival delay
    0 min
    • Arrived on time 100% of the time (8 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 84% on time; 3 to 6 PM: 51%).
    • 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 (8 flights), so its score leans on the airline's record at this hour.

    Limited track record · 8 flights

    Find United 1186 fares Opens this date on Aviasales

  3. #3 · Envoy 4106 · sold as American Eagle

    8:31 AM → 12:08 PM2h 37m nonstop

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

    87%

    chance on time

    On time (history)
    89%
    Cancelled
    0.0%
    Avg arrival delay
    6 min
    • Arrived on time 89% of the time (73 flights, Jun 2025 to May 2026).
    • Never cancelled in 73 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 84% on time; 3 to 6 PM: 51%).
    • 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 · 73 flights

    Find 8:31 AM flight fares Opens this date on Aviasales

  4. #4 · United 2213

    6:00 AM → 9:25 AM2h 25m nonstop

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

    86%

    chance on time

    On time (history)
    89%
    Cancelled
    0.0%
    Avg arrival delay
    7 min
    • Arrived on time 89% of the time (28 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 84% on time; 3 to 6 PM: 51%).
    • 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 (28 flights), so its score leans on the airline's record at this hour.

    Limited track record · 28 flights

    Find United 2213 fares Opens this date on Aviasales

  5. #5 · American 2968

    6:00 AM → 9:27 AM2h 27m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as American 966; its record covers all of them.

    83%

    chance on time

    On time (history)
    89%
    Cancelled
    0.0%
    Avg arrival delay
    8 min
    • Arrived on time 89% of the time (38 flights, Jun 2025 to May 2026).
    • Never cancelled in 38 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 84% on time; 3 to 6 PM: 51%).
    • 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 · 38 flights

    Find American 2968 fares Opens this date on Aviasales

  6. #6 · Delta 2828

    7:00 AM → 10:35 AM2h 35m nonstop

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

    83%

    chance on time

    On time (history)
    89%
    Cancelled
    4.1%
    Avg arrival delay
    5 min
    • Arrived on time 89% of the time (47 flights, Jun 2025 to May 2026).
    • Cancelled 4.1% of the time (2 of 49).
    • Leaves in this route's most on-time window (Before 9 AM: 84% on time; 3 to 6 PM: 51%).
    • 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 · 47 flights

    Find Delta 2828 fares Opens this date on Aviasales

  7. #7 · Republic 4358 · sold as American Eagle, Delta Connection or United Express

    6:26 AM → 9:54 AM2h 28m nonstop

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

    82%

    chance on time

    On time (history)
    84%
    Cancelled
    3.8%
    Avg arrival delay
    8 min
    • Arrived on time 84% of the time (25 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 84% on time; 3 to 6 PM: 51%).
    • 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 (25 flights), so its score leans on the airline's record at this hour.

    Limited track record · 25 flights

    Find 6:26 AM flight fares Opens this date on Aviasales

  8. #8 · United 1117

    9:15 AM → 12:46 PM2h 31m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as United 442; its record covers all of them.

    80%

    chance on time

    On time (history)
    84%
    Cancelled
    0.0%
    Avg arrival delay
    12 min
    • Arrived on time 84% of the time (75 flights, Jun 2025 to May 2026).
    • Never cancelled in 75 scheduled flights.
    • Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).
    • Lands inside BOS's trouble window: 79% of its 196 ground stops and delay programs started between noon and 6 PM.

    Moderate track record · 75 flights

    Find United 1117 fares Opens this date on Aviasales

  9. #9 · Republic 4616 · sold as American Eagle, Delta Connection or United Express

    7:05 AM → 10:39 AM2h 34m nonstop

    Local times, typical schedule. Last flown 2026-05-20. Same departure also flew as Republic 5633; its record covers all of them.

    80%

    chance on time

    On time (history)
    85%
    Cancelled
    3.5%
    Avg arrival delay
    9 min
    • Arrived on time 85% of the time (137 flights, Jun 2025 to May 2026).
    • Cancelled 3.5% of the time (5 of 142).
    • Leaves in this route's most on-time window (Before 9 AM: 84% on time; 3 to 6 PM: 51%).
    • 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 · 137 flights

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

  10. #10 · Envoy 3489 · sold as American Eagle

    2:40 PM → 6:04 PM2h 24m nonstop

    Local times, typical schedule. Last flown 2026-04-06. Same departure also flew as Envoy 3710; its record covers all of them.

    78%

    chance on time

    On time (history)
    81%
    Cancelled
    3.8%
    Avg arrival delay
    15 min
    • Arrived on time 81% of the time (200 flights, Jun 2025 to May 2026).
    • Cancelled 3.8% of the time (8 of 210).
    • 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 · 200 flights

    Find 2:40 PM flight 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)79%

    449 flights · 83% on time as flown · 2.5% cancel

  • JetBlue71%

    537 flights · 73% on time as flown · 2.5% cancel

  • Delta Air Lines67%

    961 flights · 69% on time as flown · 2.4% cancel

  • United Airlines67%

    2,633 flights · 68% on time as flown · 1.8% cancel

  • Republic Airways (sold as American Eagle, Delta Connection or United Express)66%

    881 flights · 71% on time as flown · 5.0% cancel

  • American Airlines60%

    2,100 flights · 61% on time as flown · 2.6% cancel

On time by departure time

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

  • Before 9 AM84%

    1,974 flights · avg delay 10 min

  • 9 AM to noon73%

    1,639 flights · avg delay 20 min

  • Noon to 3 PM59%

    1,093 flights · avg delay 33 min

  • 3 to 6 PM51%

    1,118 flights · avg delay 44 min

  • 6 to 9 PM59%

    1,537 flights · avg delay 35 min

Best day: Saturday (80%). Worst: Friday (68%).

Smarter routing

Nearby airports that run more on time

  • ORD → MHT 80% chance on time

    Chicago O'Hare International Airport to Manchester-Boston Regional Airport · 565 flights a year · 45 mi from your airports · yours: 66%

    Rank flightsFares

  • MDW → PVD 76% chance on time

    Chicago Midway International Airport to Rhode Island T. F. Green International Airport · 770 flights a year · 64 mi from your airports · yours: 66%

    Rank flightsFares

  • MDW → MHT 73% chance on time

    Chicago Midway International Airport to Manchester-Boston Regional Airport · 512 flights a year · 60 mi from your airports · yours: 66%

    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
74
F
79
M
75
A
77
M
71
J
69
J
64
A
71
S
67
O
73
N
80
D
75

What delays this route

  • Late-arriving aircraft41%
  • Air traffic control and airport volume33%
  • Airline (crew, maintenance, boarding)21%
  • Severe weather5%

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 BOS questions

What time of day is best to fly ORD to BOS?
Before 9 AM: 84% of flights arrived on time, against 51% 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 BOS?
Envoy, with a season-adjusted 79% chance of operating and arriving on time over 449 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 BOS?
July (64% on time); the best was November (80%), 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