$89 Find Cheap Flights from Chicago O'Hare Airport to Ontario - Compare and Save

These are the earliest and latest flight times available from Chicago O'Hare Intl Airport to Ontario:

• Earliest: departs at 1:30 pm and lands at 6:01 pm
• Latest: departs at 9:25 pm and lands at 1:56 am.

The flight takes about 4h 31m.

Two cabin classes are available on flights from Chicago O'Hare Intl Airport to Ontario:

• Economy Class
• First Class

A nonstop flight from Chicago O'Hare Intl Airport to Ontario takes 4h 31m, covering 1,695 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 O'Hare Intl Airport to Ontario range from $309 to $554, with an average of $441 over the past 12 months. Anything below $309 counts as a good deal.

Last-minute fares on this route (booked within two weeks of departure) run 0% above the $441 route average. Book 13 weeks before departure for the lowest fares.

On this route, layover flights are cheaper than nonstop options on average. Layover fares average $311 round-trip via Denver Intl (DEN), compared to $477 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.

The Boeing 737-800 family is used most often on this route, operated mainly by United Airlines and Delta. Other aircraft seen on the route include Boeing 737 MAX 8 variants.

Afternoon is the busiest departure period on Chicago O'Hare Intl Airport to Ontario flights, with 100% of flights leaving in that window. Morning departures account for 0%, evening flights for 0%, and night flights for 0%.

American Airlines is the only airline on the Chicago O'Hare Intl Airport to Ontario route offering in-flight Wi-Fi. Pricing depends on fare class.

One-way fares from Chicago O'Hare Intl Airport to Ontario are currently lower than usual. Average one-way flight prices are about $126, which is 46% 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 O'Hare Intl Airport to Ontario usually depart from Chicago O'Hare Intl (ORD) and arrive at Ontario (ONT).

One-stop flights from Chicago O'Hare Intl Airport to Ontario most commonly connect through:

• Phoenix Sky Harbor Intl (PHX) - 46% of one-stop connections
• Denver Intl (DEN) - 19% of one-stop connections
• Salt Lake City (SLC) - 18% of one-stop connections
• Houston George Bush Intcntl (IAH) - 10% of one-stop connections

Yes. Flexible dates can save you up to 38% on flights from Chicago O'Hare Intl Airport to Ontario. Thursday is the cheapest departure day at $342 round-trip on average, while Sunday is the most expensive at $549, a difference of $207.

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

2 airlines operate flights between Chicago O'Hare Intl Airport and Ontario. The airlines offering nonstop flights on this route include:

• United Airlines
• American Airlines

Flying via Phoenix Sky Harbor Intl (PHX) gives the shortest average 1-stop total travel time at 6h 25m, compared with 6h 36m via Salt Lake City (SLC) and 6h 40m via Dallas/Fort Worth (DFW).

Ontario is 2 hours behind Chicago O'Hare Intl Airport (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 O'Hare Intl Airport to Ontario flights:

• United Airlines: offers extra legroom; 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
• American Airlines: 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.