Direct (nonstop) flights from Ontario to Chicago
1 airline flys nonstop from Ontario International Airport (ONT) to Chicago Midway International (MDW). It's 1,706 miles (2,745 km), about 3h 45m in the air. Operated by Southwest Airlines.
Southwest Airlines
Route data last updated: May 30, 2026
Airlines with non-stop flights
WN
Southwest Airlines
Alternative Routes
Other ways to fly from Ontario to Chicago with one stop · direct emits 288 kg CO₂ per passenger
Looking for the return flight?
MDW → ONT: Flights from Chicago to OntarioOther direct flights from Ontario
Direct flights from Chicago (MDW)
Frequently Asked Questions
How long is the direct flight from Ontario to Chicago?
A nonstop flight from Ontario (ONT) to Chicago (MDW) takes approximately 3 hours and 45 minutes. The distance is 1,706 miles (2,745 km).
Which airlines fly nonstop from Ontario to Chicago?
Just Southwest Airlines.
Is there a nonstop flight from Ontario to Chicago?
Yes. 1 airline: Southwest Airlines.
How far is Ontario from Chicago?
The flight distance from Ontario to Chicago is 1,706 miles (2,745 km), measured as the great-circle (shortest air) distance.
What type of aircraft flies from Ontario to Chicago?
At 3h 45m, 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 288 kg CO2 per passenger one-way. That's about the same as driving 1,440 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.