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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 Airport to Chicago O'Hare International Airport? If you want to travel next month, return fares start from R 3,108. Find the lowest prices on one-way and return tickets right here.
Chicago.R 1,607 per passenger.Departing Sat, 12 Sep.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Ontario International on Sat, 12 Sep, arriving in Chicago O'Hare International.Price includes taxes and charges.From R 1,607, select.
Chicago.R 1,630 per passenger.Departing Mon, 24 Aug.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Ontario International on Mon, 24 Aug, arriving in Chicago O'Hare International.Price includes taxes and charges.From R 1,630, select.
Chicago.R 1,828 per passenger.Departing Thu, 12 Nov.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Ontario International on Thu, 12 Nov, arriving in Chicago O'Hare International.Price includes taxes and charges.From R 1,828, select.
Chicago.R 1,990 per passenger.Departing Thu, 26 Nov.One-way flight with United.Outbound direct flight with United departs from Ontario International on Thu, 26 Nov, arriving in Chicago O'Hare International.Price includes taxes and charges.From R 1,990, select.
Chicago.R 1,996 per passenger.Departing Tue, 22 Sep.One-way flight with United.Outbound direct flight with United departs from Ontario International on Tue, 22 Sep, arriving in Chicago O'Hare International.Price includes taxes and charges.From R 1,996, select.
Chicago.R 2,002 per passenger.Departing Thu, 22 Oct.One-way flight with United.Outbound direct flight with United departs from Ontario International on Thu, 22 Oct, arriving in Chicago O'Hare International.Price includes taxes and charges.From R 2,002, select.
Chicago.R 2,167 per passenger.Departing Wed, 9 Dec.One-way flight with United.Outbound indirect flight with United, departs from Ontario International on Wed, 9 Dec, arriving in Chicago O'Hare International.Price includes taxes and charges.From R 2,167, select.
Chicago.R 2,637 per passenger.Departing Tue, 5 Jan.One-way flight with Delta.Outbound indirect flight with Delta, departs from Ontario International on Tue, 5 Jan, arriving in Chicago O'Hare International.Price includes taxes and charges.From R 2,637, select.
Chicago.R 2,741 per passenger.Departing Wed, 26 Aug.One-way flight with United.Outbound direct flight with United departs from Ontario International on Wed, 26 Aug, arriving in Chicago O'Hare International.Price includes taxes and charges.From R 2,741, select.
Chicago.R 3,001 per passenger.Departing Thu, 30 Jul.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Ontario International on Thu, 30 Jul, arriving in Chicago O'Hare International.Price includes taxes and charges.From R 3,001, select.
Chicago.R 3,086 per passenger.Departing Tue, 30 Mar.One-way flight with Delta.Outbound indirect flight with Delta, departs from Ontario International on Tue, 30 Mar, arriving in Chicago O'Hare International.Price includes taxes and charges.From R 3,086, select.
Chicago.R 3,180 per passenger.Departing Sat, 15 May.One-way flight with Delta.Outbound indirect flight with Delta, departs from Ontario International on Sat, 15 May, arriving in Chicago O'Hare International.Price includes taxes and charges.From R 3,180, select.
Chicago.R 3,735 per passenger.Departing Sat, 15 May.One-way flight with American Airlines.Outbound direct flight with American Airlines departs from Ontario International on Sat, 15 May, arriving in Chicago O'Hare International.Price includes taxes and charges.From R 3,735, select.
Chicago.R 3,761 per passenger.Departing Wed, 30 Dec.One-way flight with United.Outbound direct flight with United departs from Ontario International on Wed, 30 Dec, arriving in Chicago O'Hare International.Price includes taxes and charges.From R 3,761, select.
Chicago.R 4,044 per passenger.Departing Mon, 26 Apr.One-way flight with Alaska Airlines.Outbound indirect flight with Alaska Airlines, departs from Ontario International on Mon, 26 Apr, arriving in Chicago O'Hare International.Price includes taxes and charges.From R 4,044, select.
Chicago.R 4,049 per passenger.Departing Tue, 30 Mar.One-way flight with United.Outbound direct flight with United departs from Ontario International on Tue, 30 Mar, arriving in Chicago O'Hare International.Price includes taxes and charges.From R 4,049, 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 September.
Jul
from R 3,001
Aug
from R 1,630
Sep
from R 1,607
Oct
from R 2,002
Nov
from R 1,828
Dec
from R 2,167
Jan
from R 2,637
Feb
Find prices
Mar
from R 3,086
Apr
from R 4,044
May
from R 3,180
Jun
from R 4,123

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.

Chicago Midway

14km from central Chicago
Closest
from R 1,995
Search flights

Chicago O'Hare International

25km from central Chicago
Cheapest
from R 1,607
Search flights

Chicago Rockford

127km from central Chicago
from R 1,941
Search flights

Ontario to Chicago: Flight information

The things to know before you go.
Cheapest flight foundR 1,607
Cheapest month to flySeptember
Average flight time4 hrs, 9 mins
Most popular airlineUnited
Average flights per week13

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 R 3,108. 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 9 minutes is the average flight time from Ontario International to Chicago O'Hare International.
United and American Airlines fly direct from Ontario International to Chicago O'Hare International.
As of July 2026, there are 13 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 August.
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 Monday, 17 August 2026.
Yes – the average flight time is 4 hours and 9 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 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, Frontier Airlines and United offer the cheapest flight tickets to Chicago O'Hare International.

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

  • The average length of a direct flight from Ontario International Airport to Chicago O'Hare International Airport is 4 hours 10 minutes.

  • Chicago's timezone is UTC-6, which makes Chicago two hours ahead of Ontario.

  • Choose from five weekly Ontario International Airport to Chicago O'Hare International Airport flights. The 07:00 departure with United Airlines is the earliest available. United Airlines operates the latest service of the day at 07:00.

  • Your ONT to ORD flight won't wait if you're late, so get to the airport on time. Arrive up to one hour in advance for domestic flights and two hours ahead for international travel.

  • You can expect longer lines during popular months such as July. Arriving up to four hours in advance for an international flight and two hours for domestic departures is a smart move.

  • United offers direct flights from Ontario International Airport to Chicago O'Hare International Airport. Book with this popular carrier, then get ready to tick off the sights in Chicago — and maybe even more of the United States if your schedule allows.

  • The majority of passengers choose to travel with United on this route.

  • United is the most punctual carrier that offers ONT to ORD flights, with 74.47% of its services arriving on schedule.

  • Think about adding a stopover when booking your ticket from Ontario International Airport to Chicago O'Hare International Airport. Simply deselect 'Direct flights only' to break up your trip, or maybe even explore a new city along the way. Here's where you can stop between ONT and ORD:

    • Denver International Airport

    • Phoenix Sky Harbour Airport

    • Harry Reid International Airport

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

  • The cheapest price we've found for a one-way Ontario International Airport to Chicago O'Hare International Airport flight is R 1,603. A return plane ticket right now is R 3,108. Depending on the availability when you book, these fares can change.

  • Score cheap tickets from ONT to ORD by booking at least one month ahead. Based on our research, that's the sweet spot for picking up a bargain.

  • The cheapest month for flights from Ontario International Airport to Chicago O'Hare International Airport is June. Use the 'Whole month' tool to see the lowest airfares if you have flexible dates.

  • Cut down on the time spent looking for cheap flights from ONT to ORD by creating a Price Alert. We'll send you an email or notification through the app when a lower fare becomes available.

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

Handy information about Ontario International Airport (ONT)

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

  • 83% of flights departing from Ontario International Airport touch down at their destination according to schedule. Given its dependable on-time performance, you're unlikely to experience delays when taking off from ONT.

  • Ontario International Airport is around 10 kilometres from central Ontario. If you're driving, ride-sharing or catching a taxi from the centre, it'll take you 15 minutes or so to arrive, depending on the traffic.

  • Catching public transport? Expect a journey time of around 45 minutes.

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

Arriving at Chicago O'Hare International Airport (ORD)

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

  • The street address for ORD is 10000 West O'Hare.

  • From Chicago O'Hare International Airport, Chicago is approximately 27 kilometres away. It takes around 30 minutes to get to the centre driving.

  • If you're travelling on public transport, expect a journey of about 45 minutes.

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

  • It's time to work out your trip dates for your flight from Ontario International Airport to Chicago O'Hare International Airport. July is the most popular month to visit Chicago. If you like a more laid-back vibe, go in March.

  • Book your flight from Ontario International Airport to Chicago O'Hare International Airport for July if you'd like to visit Chicago during its warmest month. Expect temperatures of between 16ºC (61ºF) and 28ºC (82ºF).

  • For cooler conditions, search for a cheap ticket from ONT to ORD in January. Temperatures average between -12ºC (10ºF) and 3ºC (37ºF) then.

Explore more of the United States

  • Chicago has its own special appeal, but there are so many other corners of the United States waiting to be explored. Around 451 kilometres south-east of Chicago, a visit to Columbus will keep you busy. Check out popular attractions like Franklin Park Conservatory and Botanical Gardens, Whetstone Park / Park of Roses and Ohio Theatre.

  • If there's time to check out another major stop in the United States, head for Indianapolis, about 257 kilometres south-east of Chicago. Lucas Oil Stadium, Eiteljorg Museum and The Children's Museum of Indianapolis are key reasons to visit.

Prices shown on this page are estimated lowest prices only. Found in the last 12 days.