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Route on-time record

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

Chicago (Chicago O'Hare International Airport) to Boise (Boise Air Terminal/Gowen Field). 1,104 nonstop flights in Jun 2025 to May 2026, 69% arrived within 15 minutes and 1.0% were cancelled. The most reliable flight number was United 2775 at 8:40 AM.

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

ORD → BOI

Chicago to Boise: 1,104 nonstop flights a year

On time (12 months)

69%

Cancelled

1.0%

avg delay 23 min

Best time to leave

Before 9 AM

81% on time vs 57% 6 to 9 PM

Most reliable airline

United

74% chance on time

Check ORD to BOI 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 2775

    8:40 AM → 11:32 AM3h 52m nonstop

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

    76%

    chance on time

    On time (history)
    64%
    Cancelled
    0.0%
    Avg arrival delay
    22 min
    • Arrived on time 64% of the time (11 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 81% on time; 6 to 9 PM: 57%).
    • 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 2775 fares Opens this date on Aviasales

  2. #2 · American 2116

    9:54 AM → 12:49 PM3h 55m nonstop

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

    76%

    chance on time

    On time (history)
    80%
    Cancelled
    0.0%
    Avg arrival delay
    13 min
    • Arrived on time 80% of the time (44 flights, Jun 2025 to May 2026).
    • Never cancelled in 44 scheduled flights.
    • Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).
    • 53% of its delay minutes came from the plane arriving late from an earlier flight.

    Limited track record · 44 flights

    Find American 2116 fares Opens this date on Aviasales

  3. #3 · SkyWest 5928 · sold as United Express, Delta Connection, American Eagle or Alaska

    8:40 AM → 11:49 AM4h 09m nonstop

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

    72%

    chance on time

    On time (history)
    69%
    Cancelled
    0.0%
    Avg arrival delay
    26 min
    • Arrived on time 69% of the time (169 flights, Jun 2025 to May 2026).
    • Never cancelled in 170 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 81% on time; 6 to 9 PM: 57%).
    • 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 · 169 flights

    Find 8:40 AM flight fares Opens this date on Aviasales

  4. #4 · American 2340

    11:30 AM → 2:20 PM3h 50m nonstop

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

    71%

    chance on time

    On time (history)
    73%
    Cancelled
    0.0%
    Avg arrival delay
    10 min
    • Arrived on time 73% 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).
    • 74% of its delay minutes came from the plane arriving late from an earlier flight.
    • Short track record (11 flights), so its score leans on the airline's record at this hour.

    Limited track record · 11 flights

    Find American 2340 fares Opens this date on Aviasales

  5. #5 · Envoy 4324 · sold as American Eagle

    9:47 AM → 1:00 PM4h 13m nonstop

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

    71%

    chance on time

    On time (history)
    63%
    Cancelled
    0.0%
    Avg arrival delay
    18 min
    • Arrived on time 63% 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).
    • Short track record (30 flights), so its score leans on the airline's record at this hour.

    Limited track record · 30 flights

    Find 9:47 AM flight fares Opens this date on Aviasales

  6. #6 · SkyWest 5290 · sold as United Express, Delta Connection, American Eagle or Alaska

    7:55 PM → 11:02 PM4h 11m nonstop

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

    60%

    chance on time

    On time (history)
    63%
    Cancelled
    3.8%
    Avg arrival delay
    36 min
    • Arrived on time 63% of the time (254 flights, Jun 2025 to May 2026).
    • Cancelled 3.8% of the time (10 of 266).
    • Leaves in this route's least on-time window (6 to 9 PM: 57% on time; Before 9 AM: 81%).
    • 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 · 254 flights

    Find 7:55 PM flight fares Opens this date on Aviasales

  7. #7 · United 1897

    7:55 PM → 10:50 PM3h 55m nonstop

    Local times, typical schedule. Last flown 2026-05-19.

    56%

    chance on time

    On time (history)
    35%
    Cancelled
    0.0%
    Avg arrival delay
    36 min
    • Arrived on time 35% of the time (17 flights, Jun 2025 to May 2026).
    • Leaves in this route's least on-time window (6 to 9 PM: 57% on time; Before 9 AM: 81%).
    • Departs inside ORD's trouble window: 44% of its 243 ground stops and delay programs started between 2 PM and 8 PM.
    • 63% of its delay minutes came from the plane arriving late from an earlier flight.

    Limited track record · 17 flights

    Find United 1897 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • United Airlines74%

    245 flights · 78% on time as flown · 0.4% cancel

  • American Airlines72%

    142 flights · 77% on time as flown · 0.5% cancel

  • Envoy Air (sold as American Eagle)71%

    214 flights · 69% on time as flown · 0.4% cancel

  • SkyWest Airlines (sold as United Express, Delta Connection, American Eagle or Alaska)64%

    503 flights · 62% on time as flown · 1.9% cancel

On time by departure time

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

  • Before 9 AM81%

    274 flights · avg delay 14 min

  • 9 AM to noon71%

    448 flights · avg delay 19 min

  • 3 to 6 PM68%

    44 flights · avg delay 15 min

  • 6 to 9 PM57%

    327 flights · avg delay 40 min

Best day: Saturday (78%). Worst: Friday (70%).

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
67
F
74
M
69
A
81
M
73
J
74
J
70
A
72
S
83
O
82
N
78
D
60

What delays this route

  • Airline (crew, maintenance, boarding)38%
  • Late-arriving aircraft34%
  • Air traffic control and airport volume22%
  • Severe weather7%

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

Finding the most reliable connections from ORD to BOI…

ORD to BOI questions

What time of day is best to fly ORD to BOI?
Before 9 AM: 81% of flights arrived on time, against 57% 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 BOI?
United, with a season-adjusted 74% chance of operating and arriving on time over 245 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 BOI?
December (60% on time); the best was September (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 ORD

Live status: FAA delays and ground stops