Direct (nonstop) flights from Ontario to Chicago
1 airline flys nonstop from Ontario International Airport (ONT) to Chicago O Hare International (ORD). It's 1,699 miles (2,735 km), about 4h 3m in the air. Operated by United Airlines.
United Airlines
Route data last updated: May 29, 2026
Airlines with non-stop flights
UA
United Airlines
Alternative Routes
Other ways to fly from Ontario to Chicago with one stop · direct emits 287 kg CO₂ per passenger
Looking for the return flight?
ORD → ONT: Flights from Chicago to OntarioOther direct flights from Ontario
Direct flights from Chicago (ORD)
Frequently Asked Questions
How long is the direct flight from Ontario to Chicago?
A nonstop flight from Ontario (ONT) to Chicago (ORD) takes approximately 4 hours and 3 minutes. The distance is 1,699 miles (2,735 km).
Which airlines fly nonstop from Ontario to Chicago?
Just United Airlines.
Is there a nonstop flight from Ontario to Chicago?
Yes. 1 airline: United Airlines.
How far is Ontario from Chicago?
The flight distance from Ontario to Chicago is 1,699 miles (2,735 km), measured as the great-circle (shortest air) distance.
What type of aircraft flies from Ontario to Chicago?
At 4h 3m, this route typically uses narrow-body or mid-range jets — Boeing 737 MAX or Airbus A320neo. Varies by airline.
What is the carbon footprint of a flight from Ontario to Chicago?
Roughly 287 kg CO2 per passenger one-way. That's about the same as driving 1,435 km.
Is the return flight from Chicago to Ontario also nonstop?
Yes — nonstop flights run both ways. Flight time may differ slightly due to wind patterns.
When is the cheapest time to fly from Ontario to Chicago?
Midweek flights (Tue/Wed) outside holiday peaks are usually cheapest. 3-6 weeks ahead is a good window for this route. Use "Check Prices" above to compare.
How early should I arrive at Ontario International Airport for this flight?
1.5-2 hours for domestic. Add more time during holidays or busy travel weekends.