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Cheap flights from Chicago O'Hare International to Ontario International

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Compare Chicago O'Hare International to Ontario International flight deals

Find the cheapest month or even day of the year to fly to Ontario International

Book the best Ontario International fare with no extra fees

Flight deals from Chicago O'Hare International to Ontario International

Looking for a cheap last-minute deal or the best return flight from Chicago O'Hare International to Ontario International? Find the lowest prices on one-way and return tickets right here.
Ontario.P10,248 per passenger.Departing Thu, 10 Apr, returning Mon, 14 Apr.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Chicago O'Hare International on Thu, 10 Apr, arriving in Ontario International.Inbound indirect flight with Frontier Airlines, departs from Ontario International on Mon, 14 Apr, arriving in Chicago O'Hare International.Price includes taxes and charges.From P10,248, select.
Ontario.P10,318 per passenger.Departing Wed, 12 Mar, returning Sat, 15 Mar.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Chicago O'Hare International on Wed, 12 Mar, arriving in Ontario International.Inbound indirect flight with Frontier Airlines, departs from Ontario International on Sat, 15 Mar, arriving in Chicago O'Hare International.Price includes taxes and charges.From P10,318, select.
Ontario.P10,681 per passenger.Departing Tue, 6 May, returning Tue, 20 May.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Chicago O'Hare International on Tue, 6 May, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Tue, 20 May, arriving in Chicago O'Hare International.Price includes taxes and charges.From P10,681, select.
Ontario.P10,879 per passenger.Departing Wed, 30 Apr, returning Mon, 5 May.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Chicago O'Hare International on Wed, 30 Apr, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Mon, 5 May, arriving in Chicago O'Hare International.Price includes taxes and charges.From P10,879, select.
Ontario.P11,027 per passenger.Departing Mon, 31 Mar, returning Tue, 15 Apr.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Chicago O'Hare International on Mon, 31 Mar, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Tue, 15 Apr, arriving in Chicago O'Hare International.Price includes taxes and charges.From P11,027, select.
Ontario.P13,054 per passenger.Departing Thu, 10 Jul, returning Mon, 14 Jul.Return flight with United.Outbound direct flight with United departs from Chicago O'Hare International on Thu, 10 Jul, arriving in Ontario International.Inbound direct flight with United departs from Ontario International on Mon, 14 Jul, arriving in Chicago O'Hare International.Price includes taxes and charges.From P13,054, select.
Ontario.P13,069 per passenger.Departing Fri, 8 Aug, returning Tue, 12 Aug.Return flight with United.Outbound direct flight with United departs from Chicago O'Hare International on Fri, 8 Aug, arriving in Ontario International.Inbound direct flight with United departs from Ontario International on Tue, 12 Aug, arriving in Chicago O'Hare International.Price includes taxes and charges.From P13,069, select.
Ontario.P14,048 per passenger.Departing Sun, 1 Jun, returning Sat, 14 Jun.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Chicago O'Hare International on Sun, 1 Jun, arriving in Ontario International.Inbound indirect flight with Frontier Airlines, departs from Ontario International on Sat, 14 Jun, arriving in Chicago O'Hare International.Price includes taxes and charges.From P14,048, select.

Find the cheapest month to fly from Chicago O'Hare International to Ontario International

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Chicago O'Hare International to Ontario International flights are currently cheapest in April.
Feb
Find prices
Mar
from P10,318
Apr
from P10,248
May
from P10,681
Jun
from P14,048
Jul
from P13,054
Aug
from P13,069
Sep
from P20,554
Oct
from P15,739
Nov
Find prices
Dec
Find prices
Jan
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Direct flights from Chicago O'Hare International to Ontario International

Chicago O'Hare International to Ontario International: Alternative routes

Compare routes from Chicago O'Hare International to Ontario below. You may find an airport to fly into that's cheaper, faster, or easier than Ontario International.

Chicago to Ontario: Flight information

The things to know before you go.
Cheapest flight foundP10,248
Cheapest month to flyApril
Average flight time4 hrs, 31 mins
Most popular airlineUnited
Average flights per week8

Finding cheap flights from Chicago O'Hare International to Ontario International: Frequently asked questions

The best price we found for a return flight from Chicago O'Hare International to Ontario International is P10,248. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
4 hours and 31 minutes is the average flight time from Chicago O'Hare International to Ontario International.
United flies direct from Chicago O'Hare International to Ontario International.
As of February 2025, there are 8 flights per week flying from Chicago O'Hare International to Ontario International.
The cheapest month to fly from Chicago O'Hare International to Ontario International is usually February 2025.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Chicago O'Hare International Airport to Ontario International Airport on Thursday, 10 April 2025.
Yes – the average flight time is 4 hours and 31 minutes.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Ontario International but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Ontario is around 40 days in advance, so don’t leave your flight to the last minute.
Currently, Frontier Airlines and United offer the cheapest flight tickets to Ontario International.

Flying from O'Hare International Airport (ORD) to Ontario International Airport (ONT): what you need to know

  • If you're jetting off during a bank holiday or other peak period, give yourself extra time. A good general rule is two hours ahead of domestic flights and up to four hours before international departures. Queues at security and check-in will be longer.

  • We make it a breeze to get a flight with a stopover. To look at the options for flights from O'Hare International Airport to Ontario International Airport, uncheck 'Direct flights only.' Then, pick a flight with a stop long enough to explore the city of your choice. Popular stopovers between ORD and ONT are:

    • Denver International Airport

    • Harry Reid Airport (formerly McCarran Airport)

    • Phoenix Sky Harbour International Airport

How to find the cheapest flights from O'Hare International Airport (ORD) to Ontario International Airport (ONT)

  • P5,159 is currently the best price for a one-way ticket from O'Hare International Airport to Ontario International Airport. Return flights start at P10,248. These prices can change based on demand and availability.

  • To get your hands on cheap tickets from ORD to ONT, book ahead. Airlines usually offer lower fares when flights are first released.

  • Getting cheap tickets from O'Hare International Airport to Ontario International Airport is more likely if you can be flexible with your dates. Use the 'Whole month' search tool to see the best prices across each month and bag a great deal.

  • Snapping up a cheap ticket from ORD to ONT is easy with Price Alerts. All you need to do is set up one of these automatic alerts and we'll notify you as soon as the price has fallen.

  • Take advantage of filters to find the best journey for you. To see the 'Fastest,' 'Best' or 'Cheapest' flights from O'Hare International Airport to Ontario International Airport, use the 'Sort by' function. You can also filter by airline, arrival and departure times, and number of stops.

Handy information about O'Hare International Airport (ORD)

  • O'Hare International Airport is about 40 kilometres from central Chicago. If you're ride-sharing, driving or catching a cab from the centre, it'll take 35 minutes or so to get there, depending on traffic. If you're planning to take public transport, expect the trip time to be around 54 minutes.

  • Looking for a convenient hotel close to ORD? If you're catching an early flight from O'Hare International Airport to Ontario International Airport, these accommodation options will put you moments from check-in:

Arriving at Ontario International Airport (ONT)

Getting from Ontario International Airport (ONT) to central Ontario

  • From Ontario International Airport, Ontario is approximately 6 kilometres away. It takes around 10 minutes to reach the centre driving.

  • It'll take around 1 hour and 28 minutes to get there using public transport.

When to fly to Ontario International Airport (ONT)

  • The quietest month for a flight from O'Hare International Airport to Ontario International Airport is May, while August is the most popular. Pick the ideal time to go to Ontario based on whether you prefer a laid-back vibe or a more bustling atmosphere.

  • Lock in your flight from O'Hare International Airport to Ontario International Airport for August if you want to explore Ontario during its warmest month. Expect temperatures of between 15 ºC and 35 ºC.

  • If you like cooler conditions, search for a cheap ticket from ORD to ONT in January. Average temperatures are between 4 ºC and 23 ºC then.

More about Ontario

Complete your Ontario trip with hotels and a car rental

  • Comparing flights is not our only party trick. After booking your cheap ticket to Ontario International Airport, check out our car rental offers that'll give you the flexibility to travel around at your own pace. Next, have a look at our exclusive rates for hotels to find the perfect Ontario stay.

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Plan the rest of your trip from Chicago to Ontario

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.