Cheap flights from Ontario to Chicago O'Hare Intl Airport from $55
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to Chicago O'Hare Intl Airport departing on 3/3. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
Deals available from 900+ travel sites.
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 Ontario to Chicago
Cheap round-trip flights
Cheap one-way flights
Cheap last minute flights
Cheap direct flights
Cheap bus & train deals from Ontario to Chicago
All round-trip flight deals from Ontario to Chicago
Frontier flights from Ontario to Chicago O'Hare Intl Airport
Our best Frontier deals on Ontario to Chicago O'Hare Intl Airport flight tickets
Alaska Airlines flights from Ontario to Chicago O'Hare Intl Airport
Our best Alaska Airlines deals on Ontario to Chicago O'Hare Intl Airport flight tickets
See travel insights to Chicago from
How to get the cheapest flight ticket from Ontario to Chicago O'Hare Intl Airport
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 Chicago O'Hare Intl Airport?
The month of October is another great option to travel to Chicago O'Hare Intl Airport, with average flight prices from Ontario averaging around $246.
What is the cheapest day to depart on your flight to Chicago O'Hare Intl Airport?
The cheapest day to depart on your flight to Chicago O'Hare Intl Airport is on a Tuesday when prices can be found for as low as $380. This is often the case because there is less demand to fly during this day of the week. On the other hand, Sunday is the most expensive day to depart from Ontario because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $500.
What is the cheapest time of day to depart on your flight to Chicago O'Hare Intl Airport?
Flying to Chicago O'Hare Intl Airport from Ontario in the evening is the least expensive time of day to depart. momondo users have found prices as low as $279 when looking at flights departing in the evening. Try not to purchase tickets at noon because they tend to be around $361. Of course, these prices can vary depending on the time of year and what airport you fly to.
How far in advance should I book a flight to Chicago O'Hare Intl Airport?
You are more likely to see cheaper flights to Chicago O'Hare Intl Airport from Ontario when booking 9 weeks ahead of your departure date. In general, you can expect to find flights to Chicago O'Hare Intl Airport for around $353 when searching 9 weeks out.However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Chicago O'Hare Intl Airport from Ontario for as low as $254 on momondo.
What is the cheapest airline that flies from Ontario to Chicago O'Hare Intl?
Frontier, United Airlines, and Alaska Airlines are the most popular carriers operating from Ontario to Chicago O'Hare Intl
What airlines fly to Chicago O'Hare Intl Airport?
American Airlines, United Airlines and Spirit Airlines are the top three most popular airlines that fly to Chicago O'Hare Intl Airport from Ontario according to our data. American Airlines is the first choice among our users, with 43% of people opting to fly with this airline when traveling to Chicago O'Hare Intl Airport. Keep in mind that there are 9 different airlines that fly to Chicago O'Hare Intl Airport on a routine basis, so you have a few additional options to choose from.
When to book flights from Ontario to Chicago O'Hare Intl Airport
Cheap Ontario to Chicago O'Hare Intl Airport (ONT to ORD) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from Ontario to Chicago O'Hare Intl Airport
How far is Ontario to Chicago O'Hare Intl by plane?
Chicago O'Hare Intl is 1697.7 mi away from Ontario. In terms of flight time, this usually takes a little over 5h 50m.
When did momondo last update prices for flights from Ontario Airport to Chicago O'Hare Intl Airport?
Prices for flights from Ontario Airport to Chicago O'Hare Intl Airport are updated daily.
How many operators does momondo search for flights from Ontario Airport to Chicago O'Hare Intl Airport?
As of January 2025, there are 7 operators available to choose from for flights from Ontario Airport to Chicago O'Hare Intl Airport.
How old do you have to be to fly from Ontario Airport to Chicago O'Hare Intl Airport?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Ontario Airport to Chicago O'Hare Intl Airport.
What documentation or ID do you need to fly to Chicago O'Hare Intl Airport?
The necessary travel and health documents for your Chicago O'Hare Intl Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.
What is the most popular airline from Ontario to Chicago O'Hare Intl Airport?
Based on momondo bookings for flights between Ontario and Chicago O'Hare Intl Airport, the leading airline is American Airlines, making up 47% of the total bookings. Other popular airlines include Frontier with 26%, United Airlines with 10%, and Delta with 8%.
Best airlines flying from Ontario to Chicago O'Hare Intl Airport
Compare and see reviews for airlines that fly from Ontario to Chicago O'Hare Intl Airport with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $92 | Free Cancellation | Rating 6.3 8,115 reviews | |||
| PriceFrom $108 | Free Cancellation | Rating 6.0 3,443 reviews | |||
| PriceFrom $161 | Free Cancellation | Rating 8.0 9,706 reviews | |||
| PriceFrom $236 | Free Cancellation | Rating 8.0 8,521 reviews | |||
| PriceFrom $246 | Free Cancellation | Rating 7.4 8,985 reviews | |||
| PriceFrom $247 | Free Cancellation | Rating 7.2 10,000 reviews | |||
| PriceFrom $358 | Free Cancellation | Rating 8.1 4,662 reviews |
Traveling to a place near Chicago?
Book flights to Chicago if you plan to visit one of these locationsWhy use momondo?
Why should I use momondo to find a flight deal from Ontario to Chicago?
To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Chicago from Ontario.
Can I find flights from Ontario to Chicago with flexible booking policies on momondo?
All flight searches from Ontario to Chicago on momondo can be filtered to show those which offer flexible booking policies.
How can momondo help me find flights from Ontario to Chicago?
Once all potential Ontario to Chicago flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.
I’m not ready to book a flight from Ontario to Chicago right now. Can momondo alert me if prices change?
If you are simply researching potential flights to Chicago, momondo offers a useful price alert feature which will track prices for flights to Chicago from Ontario and alert you when they change.