United AirlinesUA57% on time
Flights UA2171 06:10 daily · UA1121 07:00 daily
live
Direct flights from Ontario (ONT) to Chicago (ORD): 7 nonstop departures observed each week across 1 airline. 57% of the last 7 operated flights arrived within 15 minutes of schedule. The median arrival is on schedule. No cancellations were recorded across the 7 tracked flights. The nonstop covers 2,730 km, an estimated 4 hours 0 minutes in the air. Measured by Pro Flight Search from live flight boards at Ontario and Chicago. Updated 18 August 2026 at 00:34 UTC.
ONT
Ontario
busy · +17
ORD
Chicago
smooth · +0
2,730 km · ~4h 00m est.
Runs rough · 1 airline · 7x weekly · nonstop
57% on time
of the last 7 operated ONT → ORD flights arrived within 15 minutes
Median arrival delay is +2 min. 0 of 7 tracked legs cancelled in the sample. Will a delayed flight be cancelled? →
Search live fares for this route →Median arrival+2 minacross the last 7 operated legs
Flight time~4h 00mestimated from route distance
Weekly departures7x1 direct airline on the leg
Current nonstop fares
ONT → ORD · one way · economy · 1 adult
TodayChecking…Direct airline fares
TomorrowChecking…Direct airline fares
In one weekChecking…Direct airline fares
The week
scheduled departures · origin local time06121824
Mon
Tue
Wed
Thu
Fri
Sat
Sun
United Airlines
Each mark is a scheduled departure at its origin-local time, observed operating in the last 7 days. Today is highlighted.
Who flies it
observed on the boards · 7 daysHistory
operated legs · board outcomesActual board outcomes rather than schedules, paired departure and arrival per flight and day.
Full board history, day by day →
Airports right now
live boardsWeather lens
Current conditions put the pressure at ONT and ORD: 48% odds of a 15+ minute delay and around +17 min expected when it bites, measured from this route's own weather-matched delay history. See live delays → · Weather risk by airport →
next sweep in 120s
How the Ontario to Chicago route actually runs
Pro Flight Search tracks every published board update for nonstop ONT to ORD flights: schedules, estimates, gate pushes and actual departures. The verdict above comes from operated flights, so it reflects what this route does rather than what the timetable promises. Fares link straight to the operating airline with no markups.
Planning around a delay? Live airport delays · Weather delay risk map · Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure
Cite this data
Journalists, bloggers, and researchers may cite this page with attribution and a link to Pro Flight Search.
Suggested citation
Pro Flight Search — Ontario (ONT) to Chicago (ORD) route reliability, measured from operated flights on official airport boards.
Canonical URL
How we measure this →
https://proflightsearch.com/search-flights/ONT-ORD
ONT to ORD questions
Is ONT–ORD running on time right now?
Smooth skies ahead. The departure side at ONT is the weaker end, route health score 89/100. The airports section above carries the live status and delay window at both ends.
Morning or evening flight on ONT–ORD?
Operators schedule morning departures around 06:10 from ONT. Earlier flights typically land before destination-airport delays accumulate later in the day; check the ORD delay card to confirm conditions when you'd arrive.
How long is the flight from ONT to ORD?
Great-circle distance is 2,730 km. With typical jet cruise speed plus taxi, climb and descent, expect roughly 223–264 min gate-to-gate on this route.
How often does ONT–ORD fly?
United Airlines runs the route with about 14 flights a week (daily). Since one carrier owns the route, a single disruption tends to ripple through the day.
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