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Cheap flights from Chicago O'Hare International to Ontario International

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.P10,986 per passenger.Departing Mon, 8 Dec, returning Fri, 12 Dec.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Chicago O'Hare International on Mon, 8 Dec, arriving in Ontario International.Inbound indirect flight with Frontier Airlines, departs from Ontario International on Fri, 12 Dec, arriving in Chicago O'Hare International.Price includes taxes and charges.From P10,986, select.
Ontario.P11,544 per passenger.Departing Fri, 9 Jan, returning Fri, 16 Jan.Return flight with Spirit Airlines and Frontier Airlines.Outbound indirect flight with Spirit Airlines, departs from Chicago O'Hare International on Fri, 9 Jan, arriving in Ontario International.Inbound indirect flight with Frontier Airlines, departs from Ontario International on Fri, 16 Jan, arriving in Chicago O'Hare International.Price includes taxes and charges.From P11,544, select.
Ontario.P14,805 per passenger.Departing Fri, 28 Nov, returning Fri, 5 Dec.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Chicago O'Hare International on Fri, 28 Nov, arriving in Ontario International.Inbound indirect flight with Frontier Airlines, departs from Ontario International on Fri, 5 Dec, arriving in Chicago O'Hare International.Price includes taxes and charges.From P14,805, select.
Ontario.P18,069 per passenger.Departing Wed, 24 Dec, returning Mon, 5 Jan.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Chicago O'Hare International on Wed, 24 Dec, arriving in Ontario International.Inbound indirect flight with Frontier Airlines, departs from Ontario International on Mon, 5 Jan, arriving in Chicago O'Hare International.Price includes taxes and charges.From P18,069, select.
Ontario.P19,981 per passenger.Departing Mon, 23 Feb, returning Tue, 3 Mar.Return flight with Delta.Outbound indirect flight with Delta, departs from Chicago O'Hare International on Mon, 23 Feb, arriving in Ontario International.Inbound indirect flight with Delta, departs from Ontario International on Tue, 3 Mar, arriving in Chicago O'Hare International.Price includes taxes and charges.From P19,981, select.
Ontario.P20,690 per passenger.Departing Thu, 29 Jan, returning Sun, 1 Feb.Return flight with Alaska Airlines.Outbound indirect flight with Alaska Airlines, departs from Chicago O'Hare International on Thu, 29 Jan, arriving in Ontario International.Inbound indirect flight with Alaska Airlines, departs from Ontario International on Sun, 1 Feb, arriving in Chicago O'Hare International.Price includes taxes and charges.From P20,690, select.
Ontario.P21,203 per passenger.Departing Mon, 24 Nov, returning Thu, 27 Nov.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Chicago O'Hare International on Mon, 24 Nov, arriving in Ontario International.Inbound indirect flight with Frontier Airlines, departs from Ontario International on Thu, 27 Nov, arriving in Chicago O'Hare International.Price includes taxes and charges.From P21,203, select.
Ontario.P23,611 per passenger.Departing Mon, 9 Feb, returning Mon, 16 Feb.Return flight with Delta.Outbound indirect flight with Delta, departs from Chicago O'Hare International on Mon, 9 Feb, arriving in Ontario International.Inbound indirect flight with Delta, departs from Ontario International on Mon, 16 Feb, arriving in Chicago O'Hare International.Price includes taxes and charges.From P23,611, 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 December.
Nov
from P21,203
Dec
from P10,986
Jan
from P11,544
Feb
from P23,611
Mar
from P29,265
Apr
from P30,005
May
from P31,068
Jun
from P31,227
Jul
from P30,139
Aug
Find prices
Sep
Find prices
Oct
Find prices

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 foundP10,986
Cheapest month to flyDecember
Average flight time4 hrs, 32 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 P10,986. 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 32 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 November 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 December.
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 Monday, 8 December 2025.
Yes – the average flight time is 4 hours and 32 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.

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

  • Ontario is two hours behind Chicago and follows the UTC-7 timezone.

  • Arriving two hours before an international flight and one hour ahead of a domestic departure are travel rules to live by. Get to the airport on time to board your ORD to ONT flight.

  • During popular months like August, it's best to get to the airport well in advance. Plan to arrive two hours before domestic departures and four hours ahead for international flights when you travel during peak periods in general.

  • Think about adding a stopover when booking your ticket from O'Hare International Airport to Ontario International Airport. Simply deselect 'Direct flights only' to break up your journey, or even explore someplace new along the way. Check out these options between ORD and ONT:

    • 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)

  • At the moment, P3,894 is the cheapest price we've seen for a one-way O'Hare International Airport to Ontario International Airport flight. The best price for a return plane ticket is P10,986. Bear in mind that fares could change due to demand when booking.

  • To score cheap tickets from ORD to ONT, book in advance. Airlines usually offer their most competitively priced fares when flights are first made available.

  • The 'Whole month' search tool shows you the cheapest flights from O'Hare International Airport to Ontario International Airport throughout the month. It's an easy way to find a bargain if your trip dates are flexible.

  • Landing cheap flights from ORD to ONT is a piece of cake with Price Alerts. All you need to do is set up one of these automatic alerts and we'll get in touch as soon as a new discounted fare appears.

  • Pick your preferred departure and arrival times, number of stops and airlines with the filters. Alternatively, sort your results by 'Cheapest' to see the best deals on flights from O'Hare International Airport to Ontario International Airport.

Handy information about O'Hare International Airport (ORD)

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

  • When it comes to the on-time performance of O'Hare International Airport, data shows 74.85% of flights arrive within the scheduled timeframe.

  • O'Hare International Airport is around 40 kilometres from central Chicago. If you're driving, ride-sharing or catching a cab from the centre, it'll take you 35 minutes or so to arrive, depending on the traffic.

  • The journey on public transport will take about 55 minutes.

  • Get your journey off to a relaxed start by staying near ORD. Whether you've booked an early flight from O'Hare International Airport to Ontario International Airport or just don't want to be rushed, these hotels have you covered:

Arriving at Ontario International Airport (ONT)

Getting from Ontario International Airport (ONT) to central Ontario

  • The street address for ONT is 2900 E. Airport Drive.

  • Ontario International Airport to central Ontario has a drive time of around 10 minutes. It's approximately 6 kilometres away.

  • Travelling to the centre by public transport typically takes 1 hour 30 minutes.

When to fly to Ontario International Airport (ONT)

  • It's time to pick your trip dates for your flight from O'Hare International Airport to Ontario International Airport. August is the most popular month to head to Ontario. If you're after a more low-key vibe, go in May.

  • When booking your flight from O'Hare International Airport to Ontario International Airport, consider the kind of weather you enjoy. August is the warmest month in Ontario, with temperatures ranging from 15ºC (59ºF) to 35ºC (95ºF).

  • January sees average temperatures of between 4ºC (39ºF) and 23ºC (73ºF). Search for cheap tickets from ORD to ONT sometime then if you like travelling in cooler conditions.

Explore more of United States

  • Ontario has its own special appeal, but there are so many other corners of United States just waiting to be discovered. About 56 kilometres west of Ontario, a visit to Los Angeles will keep you on the move. Start with leading attractions like Griffith Observatory, The Broad and La Brea Tar Pits & Museum.

  • Around 153 kilometres south of Ontario, San Diego is another essential stop in United States. Get a taste of what this destination has to offer at San Diego Zoo, USS Midway Museum and SeaWorld San Diego.

More travel options

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