Direct (nonstop) flights from Chicago to Ontario
1 airline flys nonstop from Chicago Midway International (MDW) to Ontario International Airport (ONT). It's 1,706 miles (2,745 km), about 4h 10m in the air. Operated by Southwest Airlines.
Southwest Airlines
Route data last updated: May 26, 2026
Airlines with non-stop flights
WN
Southwest Airlines
Alternative Routes
Other ways to fly from Chicago to Ontario with one stop · direct emits 288 kg CO₂ per passenger
Looking for the return flight?
ONT → MDW: Flights from Ontario to ChicagoOther direct flights from Chicago
Direct flights from Ontario (ONT)
Frequently Asked Questions
How long is the direct flight from Chicago to Ontario?
A nonstop flight from Chicago (MDW) to Ontario (ONT) takes approximately 4 hours and 10 minutes. The distance is 1,706 miles (2,745 km).
Which airlines fly nonstop from Chicago to Ontario?
Just Southwest Airlines.
Is there a nonstop flight from Chicago to Ontario?
Yes. 1 airline: Southwest Airlines.
How far is Chicago from Ontario?
The flight distance from Chicago to Ontario is 1,706 miles (2,745 km), measured as the great-circle (shortest air) distance.
What type of aircraft flies from Chicago to Ontario?
At 4h 10m, 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 Chicago to Ontario?
Roughly 288 kg CO2 per passenger one-way. That's about the same as driving 1,440 km.
Is the return flight from Ontario to Chicago 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 Chicago to Ontario?
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 Chicago Midway International for this flight?
1.5-2 hours for domestic. Add more time during holidays or busy travel weekends.