Cheap flights from Chicago (CHI) to Ontario (ONT) from $76

Monday is generally a great day to depart. Flying on this day could help you save up to 91%.

Find a great deal and save up to 39% by booking at least 54 days prior to your desired departure date, rather than waiting until the week of travel. According to our data, there are a number of flights available from Chicago to Ontario within the next two weeks, with the cheapest ticket starting at $356.

Due to multiple factors, expect to potentially pay more when booking in June. For low rates, January can be a great choice for travel to Ontario. Flights to Ontario from Chicago in January are about $324 on average during January, but can be found for as low as $133.

Unlike in the morning, when flights are generally more expensive, you can save up to 59% on flights from Chicago to Ontario by exploring options for tickets at noon.

Ontario (ONT) is the airport you will fly into if you book a flight from Chicago to Ontario. You should not have trouble finding flights to Ontario from Chicago; the airport handles an average of 2 inbound flights from Chicago per day. You should also have plenty of airline options to choose from since 5 airlines have flights to the Ontario airport from Chicago. It is only a 3.1 mi journey from Ontario (ONT) to Ontario’s city center.

Frontier, American Airlines, and United Airlines are some of the carriers that may have flexible cancellation policies. You can use our site to filter for other airlines that may also have this kind of flexibility.

Yes, there are multiple flights from Chicago to Ontario for under $200. The cheapest flight booked recently is on Frontier for just $193, but on average you can expect to pay $244.

Cheapflights has at least 12 direct flights from Chicago to Ontario under $400. A good price for a nonstop flight from Chicago to Ontario is less than $585.

There are currently 20+ open flights from Chicago to Ontario within the next 7 days for less than $200.

Flying on Frontier is currently your cheapest option to Ontario, with prices starting at $193. Another option worth looking into is Undisclosed Carrier, starting at $231 round trip. Frontier is currently priced 34% below the average price you’ll pay for this route.

Before booking your flight from Chicago to Ontario check out the most popular airlines for this route: American Airlines, Delta or Frontier.

ORD stands for Chicago O'Hare Intl Airport, while ONT stands for Ontario Airport. These codes are often called IATA codes, a set of identifiers established by IATA (International Air Transport Association) that is widely used by airlines and the aviation industry. Chicago Midway Airport (MDW), Chicago Greater Rockford Airport (RFD) are other airports near this flight route and their unique identifiers/IATA codes.