Cheap flights from Ontario to Chicago
From 156 USD — compare hundreds of airlines
About this route
Compare flights from Ontario to Chicago, a about 2,755 km route (around 3h 57m nonstop). We gather live prices from hundreds of airlines and agencies so you can find the cheapest and book on the official site, with no hidden fees. Direct flights are available. Airlines such as Southwest Airlines operate this route.
Airlines on this route
FAQ
What's the cheapest month to fly Ontario to Chicago?
Prices vary by season; use the price calendar to find the cheapest month.
How long is the flight from Ontario to Chicago?
A nonstop flight takes about 3h 57m and covers around 2,755 km. Connecting itineraries take longer.
Are there direct flights from Ontario to Chicago?
Yes, this route has nonstop flights. Filter by "nonstop" to see them.
Which airlines fly from Ontario to Chicago?
Southwest Airlines operate this route, among others. Compare them all in the results.
When should I book Ontario–Chicago flights?
As a rule of thumb, booking 3–8 weeks ahead and avoiding weekends and holidays tends to give the best prices. Use the calendar to spot the cheapest dates.