$118 Find Cheap Flights from Chicago to Ontario - Compare and Save

These are the earliest and latest flight times available from Chicago to Ontario:

• Earliest: departs at 10:10 am and lands at 2:36 pm
• Latest: departs at 9:30 pm and lands at 1:56 am.

The flight takes about 4h 26m.

Two cabin classes are available on flights from Chicago to Ontario:

• Economy Class
• First Class

A nonstop flight from Chicago to Ontario takes 4h 26m, covering 1,708 miles.

No, a passport is not required for this domestic route, but you will need a real ID-compliant driver's license, a state ID or another TSA-accepted form of identification.

Round-trip flights from Chicago to Ontario range from $299 to $547, with an average of $421 over the past 12 months. Anything below $299 counts as a good deal.

Last-minute fares on this route (booked within two weeks of departure) are 5% below the route average of $421. Booking late can sometimes save you money, but inventory is limited.

On this route, layover flights are cheaper than nonstop options on average. Layover fares average $312 round-trip via Houston George Bush Intcntl (IAH), compared to $460 for nonstop.

There is no standard. Checked-bag policies vary by airline on this route. Most carriers charge $40–$100 for the first checked bag in economy. Premium fares and elite-status bookings typically include a free checked bag.

Morning is the busiest departure period on Chicago to Ontario flights, with 50% of flights leaving in that window. Afternoon departures account for 50%, evening flights for 0%, and night flights for 0%.

Two airlines offer in-flight Wi-Fi on Chicago to Ontario flights:

• JetBlue
• American Airlines

Pricing varies by airline and fare class. Some plans are included with the ticket or loyalty program; others are paid add-ons priced by flight length.

One-way fares from Chicago to Ontario are currently lower than usual. Average one-way flight prices are about $122, which is 42% below the typical average for this route.

Ontario Airport (ONT) hosts 5 major car rental companies, with daily rates starting from around $18 for economy cars. Top options include:

• Fox
• Thrifty
• Europcar
• Dollar
• Alamo

Flights from Chicago to Ontario may depart from several airports in Chicago area, including Chicago Midway (MDW), Chicago O'Hare Intl (ORD) and Chicago Greater Rockford (RFD). Flights usually arrive at Ontario (ONT).

One-stop flights from Chicago to Ontario most commonly connect through:

• Phoenix Sky Harbor Intl (PHX) - 45% of one-stop connections
• Salt Lake City (SLC) - 20% of one-stop connections
• Denver Intl (DEN) - 15% of one-stop connections
• Houston George Bush Intcntl (IAH) - 10% of one-stop connections

Yes. Flexible dates can save you up to 43% on flights from Chicago to Ontario. Thursday is the cheapest departure day at $334 round-trip on average, while Monday is the most expensive at $584, a difference of $250.

KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.

3 airlines operate flights between Chicago and Ontario. The airlines offering nonstop flights on this route include:

• United Airlines
• Southwest
• American Airlines

Flying via San Jose (SJC) gives the shortest average 1-stop total travel time at 6h 24m, compared with 6h 29m via Phoenix Sky Harbor Intl (PHX) and 6h 38m via Salt Lake City (SLC).

Ontario is 2 hours behind Chicago (Pacific Time vs Central Time). Plan for the time shift when scheduling connections or first-day activities.

Some of the most popular sights in Ontario are Ontario Convention Center and Cucamonga-Guasti Regional Park. These are among the most viewed places in Ontario on KAYAK.

Among airlines operating Chicago to Ontario flights:

• United Airlines: offers extra legroom; offers free seat selection
• Southwest: offers free seat selection
• American Airlines: offers free seat selection

Extra legroom and free seat selection availability depends on fare class and route.

Here are some options for this route, based on selected ticket types and cabin classes:

• United Airlines: a cabin bag and a checked bag in Economy Class
• Southwest: a cabin bag in Economy Class class
• JetBlue: a cabin bag in Economy Class class

Bag allowance can vary by ticket type, cabin class, route and airline, so always check the fare details before booking.

Some of the most typical layover airports for various airlines traveling from Chicago to Ontario are Phoenix Sky Harbor International Airport (PHX), Dallas/Fort Worth International Airport (DFW), and Denver International Airport (DEN). If you are flying with American Airlines, your layover airports will be PHX or DFW. DEN, on the other hand, serves as a layover airport for Frontier aircraft.

Although most airlines flying from Chicago to Ontario allow pets, booking with Alaska Airlines has a number of advantages for pet owners. When compared to other airlines on this route, Alaska features some of the lowest pet fees. Furthermore, pets are permitted to travel in-cabin as long as their combined weight with that of the carrier does not exceed 20 lbs.

Yes. Several airlines operating from Chicago to Ontario - including Delta, American Airlines, and Spirit Airlines - provide environmentally friendly flights between Chicago and Ontario. Among them, American Airlines leads the list as one of the most environmentally friendly airlines because of its carbon reduction projects, which aim to equip all of its planes with fuel-efficient engines.

Delta Airlines, American Airlines, and Spirit Airlines are among the airlines where you can upgrade to first class by adding a nominal fee to your ticket. By taking advantage of this opportunity, you can fly first class at a lower rate than if you booked first class directly.