Cheap flights from Chicago O'Hare Intl Airport to Ontario from $106
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Chicago O'Hare Intl Airport to Ontario departing on 5/28. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
Discover deals from 900+ travel sites with momondo.
Save money when you book flights with momondo
Big names and deals
Big names and deals
Search 100s of travel sites to compare prices.Filter for what you want
Filter for what you want
Free Wi-Fi? Stopover? Instantly customize your results.Trusted and free
Trusted and free
We’re completely free to use - no hidden charges or fees.Price Alerts
Price Alerts
Not ready to book? to track prices.Find the cheapest flights from Chicago O'Hare Intl Airport to Los Angeles
Cheap round-trip flights
Cheap one-way flights
Cheap last minute flights
Cheap direct flights
Southwest flights from Chicago O'Hare Intl Airport to Ontario
Our best Southwest deals on Chicago O'Hare Intl Airport to Ontario flight tickets
Delta flights from Chicago O'Hare Intl Airport to Ontario
Our best Delta deals on Chicago O'Hare Intl Airport to Ontario flight tickets
See travel insights to Los Angeles from
How to get the cheapest flight ticket from Chicago O'Hare Intl Airport to Ontario
Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip
What is the cheapest month to fly to Ontario?
In general, February is the cheapest month to fly from Chicago O'Hare Intl Airport to Ontario. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $253. If you aren’t able to travel during the month of February, then book flights to Ontario from Chicago O'Hare Intl Airport during July instead. Flights to Ontario in July, while not as cheap as those in February, still average around $269.
What is the cheapest day to depart on your flight to Ontario?
The cheapest day to depart on your flight to Ontario is on a Saturday when prices can be found for as low as $370. This is often the case because there is less demand to fly during this day of the week. When flying out on a Monday, the most expensive travel day of the week, you can expect to see flight prices from Chicago O'Hare Intl Airport to Ontario for around $492.
What is the cheapest time of day to depart on your flight to Ontario?
In the evening is the cheapest time of day to fly from Chicago O'Hare Intl Airport to Ontario when you can find flight prices for as low as $318. Flying to Ontario in the evening is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying at noon when prices are $452 on average. Flights to Ontario from Chicago O'Hare Intl Airport at noon are generally more expensive because this time of day is more convenient for travelers’ schedules.
What is the cheapest Chicago O'Hare Intl to Ontario flight route?
Fly from Chicago O'Hare Intl to Ontario for the best Chicago O'Hare Intl - Ontario flight prices
How far in advance should I book a flight to Ontario?
You are more likely to see cheaper flights to Ontario from Chicago O'Hare Intl Airport when booking 8 weeks ahead of your departure date. In general, you can expect to find flights to Ontario for around $319 when searching 8 weeks out.However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Ontario from Chicago O'Hare Intl Airport for as low as $241 on momondo.
What cabin class options are available on Chicago O'Hare Intl to Ontario flights?
There are 2 cabin classes available to choose from on Chicago O'Hare Intl to Ontario flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.
What is the cheapest airline that flies from Chicago O'Hare Intl to Ontario?
Frontier, United Airlines, and Southwest are the most popular carriers operating from Chicago O'Hare Intl to Ontario
What airlines fly to Ontario?
American Airlines, Spirit Airlines and United Airlines are the top three most popular airlines that fly to Ontario from Chicago O'Hare Intl Airport according to our data. American Airlines is the first choice among our users, with 42% of people opting to fly with this airline when traveling to Ontario. Keep in mind that there are 9 different airlines that fly to Ontario on a routine basis, so you have a few additional options to choose from.
How many flights depart from Chicago O'Hare Intl Airport to Ontario on average per week?
As of April 2025, 1 flights take off from Chicago O'Hare Intl Airport and land in Ontario each week. The most common flight departure day for this route is Sun, with 100% of weekly flights taking off on this day.
When to book flights from Chicago O'Hare Intl Airport to Ontario
Cheap Chicago O'Hare Intl Airport to Ontario (ORD to ONT) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from Chicago O'Hare Intl Airport to Ontario
How far is Chicago O'Hare Intl to Ontario by plane?
A flight from Chicago O'Hare Intl to Ontario will travel around 1697.7 mi. 4h 31m is a normal flight duration for this route.
When did momondo last update prices for flights from Chicago O'Hare Intl Airport to Ontario Airport?
Prices for flights from Chicago O'Hare Intl Airport to Ontario Airport refresh daily.
How many operators does momondo search for flights from Chicago O'Hare Intl Airport to Ontario Airport?
As of April 2025, there are 5 operators available to choose from for flights from Chicago O'Hare Intl Airport to Ontario Airport.
How old do you have to be to fly from Chicago O'Hare Intl Airport to Ontario Airport?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Chicago O'Hare Intl Airport to Ontario Airport.
What documentation or ID do you need to fly to Ontario Airport?
The travel and health documents you'll need for your trip to Ontario Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Ontario Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from Chicago O'Hare Intl Airport to Ontario?
momondo data reveals that the most frequently booked plane model on the route from Chicago O'Hare Intl Airport to Ontario is Boeing 737 MAX 8, representing 19.60% of all bookings. The subsequent popular models are Airbus A320neo at 16.58%, Boeing 737-800 at 16.08%, and Airbus A321neo at 13.57%.
What is the most popular airline from Chicago O'Hare Intl Airport to Ontario?
momondo data reveals that the most frequently booked airline on the route from Chicago O'Hare Intl Airport to Ontario is American Airlines, representing 39% of all bookings. The subsequent popular airlines are Frontier at 29%, United Airlines at 15%, and Southwest at 9%.
Best airlines flying from Chicago O'Hare Intl Airport to Ontario
Compare and see reviews for airlines that fly from Chicago O'Hare Intl Airport to Ontario with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $123 | Free Cancellation | Rating 5.9 3,284 reviews | |||
| PriceFrom $231 | Free Cancellation | Rating 7.2 10,000 reviews | |||
| PriceFrom $246 | Free Cancellation | Rating 8.0 7,929 reviews | |||
| PriceFrom $246 | Free Cancellation | Rating 7.4 8,694 reviews | |||
| PriceFrom $256 | Free Cancellation | Rating 8.0 4,292 reviews |
Southwest Flights From Chicago O'Hare Intl Airport to Ontario
Southwest operates around 1 flight from Chicago O'Hare Intl Airport to Ontario every week. The average price of these flights found in the last 72 hours has been $508, but momondo users have found Southwest deals from Chicago O'Hare Intl Airport to Ontario from as low as $256 round-trip. Southwest has been scored 8.0/10 in 4,292 reviews.
Why use momondo?
Why should I use momondo to find a flight deal from Chicago to Ontario?
Finding the right flight to Ontario from Chicago is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Ontario quick and easy, saving you time and money.
Can I find flights from Chicago to Ontario with flexible booking policies on momondo?
Yes. All flights to Ontario from Chicago on momondo can be compared and filtered by various policies on offer, including flexible booking.
How can momondo help me find flights from Chicago to Ontario?
momondo provides multiple filters to help you find the best flight to Ontario from Chicago. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.
I’m not ready to book a flight from Chicago to Ontario right now. Can momondo alert me if prices change?
Yes. momondo can track prices for Chicago to Ontario flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.