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Cheap flights from Ontario International to Chicago O'Hare International

Compare Ontario International to Chicago O'Hare International flight deals

Find the cheapest month or even day of the year to fly to Chicago O'Hare International

Book the best Chicago O'Hare International fare with no extra fees

Flight deals from Ontario International to Chicago O'Hare International

Looking for a cheap last-minute deal or the best return flight from Ontario International to Chicago O'Hare International? Find the lowest prices on one-way and return tickets right here.
Chicago.P9,818 per passenger.Departing Sat, 25 Oct, returning Tue, 4 Nov.Return flight with United.Outbound direct flight with United departs from Ontario International on Sat, 25 Oct, arriving in Chicago O'Hare International.Inbound direct flight with United departs from Chicago O'Hare International on Tue, 4 Nov, arriving in Ontario International.Price includes taxes and charges.From P9,818, select.
Chicago.P9,818 per passenger.Departing Sat, 27 Sep, returning Wed, 1 Oct.Return flight with United.Outbound direct flight with United departs from Ontario International on Sat, 27 Sep, arriving in Chicago O'Hare International.Inbound direct flight with United departs from Chicago O'Hare International on Wed, 1 Oct, arriving in Ontario International.Price includes taxes and charges.From P9,818, select.
Chicago.P9,843 per passenger.Departing Wed, 14 Jan, returning Sat, 17 Jan.Return flight with United.Outbound direct flight with United departs from Ontario International on Wed, 14 Jan, arriving in Chicago O'Hare International.Inbound direct flight with United departs from Chicago O'Hare International on Sat, 17 Jan, arriving in Ontario International.Price includes taxes and charges.From P9,843, select.
Chicago.P9,843 per passenger.Departing Sat, 25 Oct, returning Wed, 29 Oct.Return flight with United.Outbound direct flight with United departs from Ontario International on Sat, 25 Oct, arriving in Chicago O'Hare International.Inbound direct flight with United departs from Chicago O'Hare International on Wed, 29 Oct, arriving in Ontario International.Price includes taxes and charges.From P9,843, select.
Chicago.P9,846 per passenger.Departing Tue, 9 Sep, returning Wed, 10 Sep.Return flight with United.Outbound direct flight with United departs from Ontario International on Tue, 9 Sep, arriving in Chicago O'Hare International.Inbound direct flight with United departs from Chicago O'Hare International on Wed, 10 Sep, arriving in Ontario International.Price includes taxes and charges.From P9,846, select.
Chicago.P9,846 per passenger.Departing Tue, 11 Nov, returning Sat, 15 Nov.Return flight with United.Outbound direct flight with United departs from Ontario International on Tue, 11 Nov, arriving in Chicago O'Hare International.Inbound direct flight with United departs from Chicago O'Hare International on Sat, 15 Nov, arriving in Ontario International.Price includes taxes and charges.From P9,846, select.
Chicago.P10,810 per passenger.Departing Thu, 25 Dec, returning Sat, 10 Jan.Return flight with United.Outbound direct flight with United departs from Ontario International on Thu, 25 Dec, arriving in Chicago O'Hare International.Inbound direct flight with United departs from Chicago O'Hare International on Sat, 10 Jan, arriving in Ontario International.Price includes taxes and charges.From P10,810, select.
Chicago.P11,203 per passenger.Departing Wed, 27 Aug, returning Wed, 3 Sep.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Ontario International on Wed, 27 Aug, arriving in Chicago O'Hare International.Inbound indirect flight with Frontier Airlines, departs from Chicago O'Hare International on Wed, 3 Sep, arriving in Ontario International.Price includes taxes and charges.From P11,203, select.

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

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Ontario International to Chicago O'Hare International flights are currently cheapest in October.
Aug
from P12,080
Sep
from P9,856
Oct
from P9,853
Nov
from P9,856
Dec
from P12,805
Jan
from P9,853
Feb
from P29,232
Mar
from P27,967
Apr
from P24,764
May
Find prices
Jun
Find prices
Jul
Find prices

Direct flights from Ontario International to Chicago O'Hare International

Ontario International to Chicago O'Hare International: Alternative routes

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

Ontario to Chicago: Flight information

The things to know before you go.
Cheapest flight foundP9,818
Cheapest month to flySeptember
Average flight time4 hrs, 1 min
Most popular airlineUnited
Average flights per week9

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

The best price we found for a return flight from Ontario International to Chicago O'Hare International is P9,818. 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 1 minute is the average flight time from Ontario International to Chicago O'Hare International.
United flies direct from Ontario International to Chicago O'Hare International.
As of August 2025, there are 9 flights per week flying from Ontario International to Chicago O'Hare International.
The cheapest month to fly from Ontario International to Chicago O'Hare International is usually September.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Ontario International Airport to Chicago O'Hare International Airport on Saturday, 27 September 2025.
Yes – the average flight time is 4 hours and 1 minute.
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 Chicago O'Hare 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 Chicago is around 40 days in advance, so don’t leave your flight to the last minute.
Currently, United offers the cheapest flight tickets to Chicago O'Hare International.

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

  • Chicago is two hours ahead of Ontario and is in the UTC-5 timezone.

  • Leave plenty of time to make your ONT to ORD flight. A good rule of thumb is to arrive two hours before international departures and an hour ahead for domestic flights.

  • You'll likely experience bigger queues in popular months like August. Arriving up to four hours in advance for international flights and two hours for a domestic departure will help ensure a smooth travel experience.

  • We make it simple to book a flight with a stopover. To see your options for tickets from Ontario International Airport to O'Hare International Airport, deselect 'Direct flights only.' Then, pick a flight with a stop long enough to tour your chosen city. Worthwhile stopovers between ONT and ORD include:

    • Harry Reid Airport (formerly McCarran Airport)

    • Denver International Airport

    • Salt Lake City International Airport

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

  • P4,909 is currently the lowest price for a one-way Ontario International Airport to O'Hare International Airport flight. Return flights start at P9,818. These prices can change depending on availability.

  • It's a good idea to book in advance if you want to find cheap tickets from ONT to ORD. That's because flight prices are based on demand, which tends to increase closer to departure.

  • Finding cheap flights from Ontario International Airport to O'Hare International Airport is easier if you're flexible with your travel plans. Use the 'Whole month' tool to see the lowest prices throughout the month and score a great deal.

  • Save time searching for cheap flights from ONT to ORD by creating a Price Alert. You'll receive an email or push notification on the app when a new discounted fare appears.

  • Lock in the right flight for you by using the filters. To see the 'Fastest,' 'Cheapest' or 'Best' flights from Ontario International Airport to O'Hare International Airport, use the 'Sort by' function. You can also filter results by airline, arrival and departure times, and number of stops.

Handy information about Ontario International Airport (ONT)

  • You'll find ONT at 2900 E. Airport Drive.

  • 83.6% of flights departing from Ontario International Airport touch down at their destination on time. With its dependable on-time performance, you're unlikely to experience delays when jetting out of ONT.

  • To get to Ontario International Airport from central Ontario, it'll take about 10 minutes if you're going by car. This depends on traffic though. It's approximately 6 kilometres from the airport to the city centre.

  • Expect a journey time of about 1 hour 30 minutes on public transport.

  • Searching for a handy hotel close to ONT? If you're catching an early flight from Ontario International Airport to O'Hare International Airport, these stays will put you moments from your departure lounge:

Arriving at O'Hare International Airport (ORD)

Getting from O'Hare International Airport (ORD) to central Chicago

  • You'll find ORD at 10000 West O'Hare.

  • O'Hare International Airport is roughly 40 kilometres from central Chicago. Driving there takes about 35 minutes.

  • When travelling by public transport, expect a journey of roughly 55 minutes.

When to fly to O'Hare International Airport (ORD)

  • August is the busiest month for flights from Ontario International Airport to O'Hare International Airport. To avoid the crowds, head to Chicago in January.

  • When booking your flight from Ontario International Airport to O'Hare International Airport, think about the type of weather you enjoy. July is the warmest month in Chicago, with temperatures ranging from 15ºC (59ºF) to 29ºC (84ºF).

  • January sees average temperatures of between -12ºC (10ºF) and 3ºC (37ºF). Look for cheap tickets from ONT to ORD sometime around then if you'd rather travel in cooler conditions.

Explore more of United States

  • You've visited Chicago, now it's time to discover other parts of United States. Travel about 451 kilometres south-east to Columbus to tick off its leading attractions. From Franklin Park Conservatory and Botanical Gardens to Ohio Statehouse and German Village, there's plenty to keep you busy.

  • Indianapolis is another sought-after destination in United States and is around 257 kilometres south-east of Chicago. No journey is complete without visiting The Children's Museum of Indianapolis, Indianapolis Museum of Art and Indianapolis Zoo.

More travel options

Plan the rest of your trip from Ontario to Chicago

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