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Route on-time record

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

Baltimore (Baltimore/Washington International Thurgood Marshall Airport) to Chicago (Chicago O'Hare International Airport). 2,688 nonstop flights in Jun 2025 to May 2026, 75% arrived within 15 minutes and 2.3% were cancelled. The most reliable flight number was United 281 at 6:00 AM.

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

BWI → ORD

Baltimore to Chicago: 2,688 nonstop flights a year

On time (12 months)

75%

Cancelled

2.3%

avg delay 25 min

Best time to leave

Before 9 AM

90% on time vs 53% 3 to 6 PM

Most reliable airline

Southwest

81% chance on time

Check BWI to ORD 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 281

    6:00 AM → 7:21 AM2h 21m nonstop

    Local times, typical schedule. Last flown 2026-04-29.

    90%

    chance on time

    On time (history)
    97%
    Cancelled
    3.1%
    Avg arrival delay
    6 min
    • Arrived on time 97% of the time (31 flights, Jun 2025 to May 2026).
    • Cancelled 3.1% of the time (1 of 32).
    • Leaves in this route's most on-time window (Before 9 AM: 90% on time; 3 to 6 PM: 53%).
    • Departs outside BWI's trouble window (2 PM to 8 PM, when 81% of its 43 ground stops and delay programs started).

    Limited track record · 31 flights

    Find United 281 fares Opens this date on Aviasales

  2. #2 · Republic 4659 · sold as American Eagle, Delta Connection or United Express

    6:00 AM → 7:23 AM2h 23m nonstop

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

    90%

    chance on time

    On time (history)
    91%
    Cancelled
    0.0%
    Avg arrival delay
    3 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: 90% on time; 3 to 6 PM: 53%).
    • Departs outside BWI's trouble window (2 PM to 8 PM, when 81% of its 43 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 6:00 AM flight fares Opens this date on Aviasales

  3. #3 · Republic 4458 · sold as American Eagle, Delta Connection or United Express

    6:52 AM → 8:22 AM2h 30m nonstop

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

    88%

    chance on time

    On time (history)
    86%
    Cancelled
    3.3%
    Avg arrival delay
    4 min
    • Arrived on time 86% of the time (29 flights, Jun 2025 to May 2026).
    • Cancelled 3.3% of the time (1 of 30).
    • Leaves in this route's most on-time window (Before 9 AM: 90% on time; 3 to 6 PM: 53%).
    • Departs outside BWI's trouble window (2 PM to 8 PM, when 81% of its 43 ground stops and delay programs started).

    Limited track record · 29 flights

    Find 6:52 AM flight fares Opens this date on Aviasales

  4. #4 · United 660

    6:20 AM → 7:43 AM2h 23m nonstop

    Local times, typical schedule. Last flown 2026-03-28.

    88%

    chance on time

    On time (history)
    89%
    Cancelled
    0.0%
    Avg arrival delay
    4 min
    • Arrived on time 89% of the time (18 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 90% on time; 3 to 6 PM: 53%).
    • Departs outside BWI's trouble window (2 PM to 8 PM, when 81% of its 43 ground stops and delay programs started).
    • Short track record (18 flights), so its score leans on the airline's record at this hour.

    Limited track record · 18 flights

    Find United 660 fares Opens this date on Aviasales

  5. #5 · United 581

    6:10 AM → 7:25 AM2h 15m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as United 349; its record covers all of them.

    88%

    chance on time

    On time (history)
    91%
    Cancelled
    0.0%
    Avg arrival delay
    6 min
    • Arrived on time 91% of the time (32 flights, Jun 2025 to May 2026).
    • Never cancelled in 32 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 90% on time; 3 to 6 PM: 53%).
    • Departs outside BWI's trouble window (2 PM to 8 PM, when 81% of its 43 ground stops and delay programs started).

    Limited track record · 32 flights

    Find United 581 fares Opens this date on Aviasales

  6. #6 · Republic 4693 · sold as American Eagle, Delta Connection or United Express

    11:41 AM → 1:11 PM2h 30m nonstop

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

    87%

    chance on time

    On time (history)
    91%
    Cancelled
    0.0%
    Avg arrival delay
    5 min
    • Arrived on time 91% of the time (44 flights, Jun 2025 to May 2026).
    • Never cancelled in 44 scheduled flights.
    • Departs outside BWI's trouble window (2 PM to 8 PM, when 81% of its 43 ground stops and delay programs started).
    • Short track record (44 flights), so its score leans on the airline's record at this hour.

    Limited track record · 44 flights

    Find 11:41 AM flight fares Opens this date on Aviasales

  7. #7 · Republic 4587 · sold as American Eagle, Delta Connection or United Express

    5:00 AM → 6:28 AM2h 28m nonstop

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

    86%

    chance on time

    On time (history)
    89%
    Cancelled
    6.9%
    Avg arrival delay
    19 min
    • Arrived on time 89% of the time (27 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 90% on time; 3 to 6 PM: 53%).
    • Departs outside BWI's trouble window (2 PM to 8 PM, when 81% of its 43 ground stops and delay programs started).
    • Short track record (27 flights), so its score leans on the airline's record at this hour.

    Limited track record · 27 flights

    Find 5:00 AM flight fares Opens this date on Aviasales

  8. #8 · Republic 4487 · sold as American Eagle, Delta Connection or United Express

    5:39 AM → 7:11 AM2h 32m nonstop

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

    86%

    chance on time

    On time (history)
    88%
    Cancelled
    2.3%
    Avg arrival delay
    23 min
    • Arrived on time 88% of the time (43 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 90% on time; 3 to 6 PM: 53%).
    • Departs outside BWI's trouble window (2 PM to 8 PM, when 81% of its 43 ground stops and delay programs started).
    • Short track record (43 flights), so its score leans on the airline's record at this hour.

    Limited track record · 43 flights

    Find 5:39 AM flight fares Opens this date on Aviasales

  9. #9 · United 1400

    11:08 AM → 12:26 PM2h 18m nonstop

    Local times, typical schedule. Last flown 2026-04-29.

    83%

    chance on time

    On time (history)
    90%
    Cancelled
    0.0%
    Avg arrival delay
    7 min
    • Arrived on time 90% of the time (29 flights, Jun 2025 to May 2026).
    • Departs outside BWI's trouble window (2 PM to 8 PM, when 81% of its 43 ground stops and delay programs started).
    • Short track record (29 flights), so its score leans on the airline's record at this hour.

    Limited track record · 29 flights

    Find United 1400 fares Opens this date on Aviasales

  10. #10 · United 704

    11:00 AM → 12:19 PM2h 19m nonstop

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

    81%

    chance on time

    On time (history)
    86%
    Cancelled
    0.0%
    Avg arrival delay
    7 min
    • Arrived on time 86% of the time (28 flights, Jun 2025 to May 2026).
    • Departs outside BWI's trouble window (2 PM to 8 PM, when 81% of its 43 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 704 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • Southwest Airlines81%

    154 flights · 85% on time as flown · 1.5% cancel

  • Republic Airways (sold as American Eagle, Delta Connection or United Express)81%

    241 flights · 85% on time as flown · 2.2% cancel

  • Spirit Airlines77%

    32 flights · 84% on time as flown · 1.9% cancel

  • United Airlines75%

    1,091 flights · 76% on time as flown · 1.3% cancel

  • Envoy Air (sold as American Eagle)71%

    932 flights · 73% on time as flown · 3.6% cancel

  • Frontier Airlines65%

    150 flights · 64% on time as flown · 3.2% cancel

  • American Airlines63%

    31 flights · 48% on time as flown · 1.9% cancel

  • SkyWest Airlines (sold as United Express, Delta Connection, American Eagle or Alaska)58%

    57 flights · 41% on time as flown · 2.2% cancel

On time by departure time

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

  • Before 9 AM90%

    736 flights · avg delay 9 min

  • 9 AM to noon84%

    814 flights · avg delay 12 min

  • Noon to 3 PM69%

    84 flights · avg delay 49 min

  • 3 to 6 PM53%

    543 flights · avg delay 47 min

  • 6 to 9 PM60%

    488 flights · avg delay 43 min

Best day: Saturday (82%). Worst: Friday (76%).

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
76
F
86
M
80
A
81
M
80
J
77
J
68
A
77
S
85
O
83
N
83
D
77

What delays this route

  • Air traffic control and airport volume31%
  • Late-arriving aircraft30%
  • Airline (crew, maintenance, boarding)22%
  • Severe weather17%

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

BWI to ORD questions

What time of day is best to fly BWI to ORD?
Before 9 AM: 90% of flights arrived on time, against 53% 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 BWI to ORD?
Southwest, with a season-adjusted 81% chance of operating and arriving on time over 154 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 BWI to ORD?
July (68% on time); the best was February (86%), 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 BWI

Live status: FAA delays and ground stops