ORD - ONT

$61 Find Cheap Flights from Chicago O'Hare Airport to Ontario - Compare and Save

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1 adult, Economy, 0 bags

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Everything you should know

Cheapest round-trip
$148
Typical prices: $309-$554
Frontier
Sun 9/30Wed 10/3
ORD - ONT • 1 stop
Cheapest non-stop
$239
Typical prices: $421-$601
American Airlines
Sun 1/7Thu 1/11
ORD - ONT • Non-stop
Nonstop flights
Every day
You can fly direct with United Airlines. Average duration is 4h 30m
Direct flights
+1
Direct flights
+1
When to book
13 weeks
in advance
Our data shows that travelers who book at least 13 weeks in advance save around 47% compared to booking last minute.
Insights
Insights
When to travel
October
Cheapest • 40% price drop
March
Most popular
Good to know
+1
Good to know
+1
Top layover airports
Denver Intl (DEN)
Cheapest • Avg $319 (round-trip)
Las Vegas Harry Reid Intl (LAS)
Shortest trip • 6h 09m (one-way)
Insights
Insights
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We hope you love your trip to Ontario!
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Expert advice
Flight Deals

Cheap Flights from O'Hare Intl to Ontario (ORD-ONT)

 
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from O'Hare Intl to Ontario

Wed, Sep 30 - Sat, Oct 3
Frontier Logo
6:30 am - 11:47 pmORD  Chicago O'Hare Intl-ONT Ontario
19h 17m1 stop Denver Intl
Frontier Logo
11:45 am - 12:23 amONT  Ontario-ORD Chicago O'Hare Intl
10h 38m1 stop Denver Intl
$148Frontier
Wed, Sep 9 - Mon, Sep 14
Frontier Logo
6:30 am - 11:47 pmORD  Chicago O'Hare Intl-ONT Ontario
19h 17m1 stop Denver Intl
Frontier Logo
11:45 am - 12:23 amONT  Ontario-ORD Chicago O'Hare Intl
10h 38m1 stop Denver Intl
$154Frontier
Thu, Jan 7 - Mon, Jan 11
American Airlines Logo
6:15 pm - 8:48 pmORD  Chicago O'Hare Intl-ONT Ontario
4h 33mnonstop
American Airlines Logo
6:00 am - 12:15 pmONT  Ontario-ORD Chicago O'Hare Intl
4h 15mnonstop
$239American Airlines
Sat, Sep 5 - Sat, Sep 12
Multiple Airlines Logo
2:22 pm - 8:24 pmORD  Chicago O'Hare Intl-ONT Ontario
8h 02m1 stop Portland
Multiple Airlines Logo
10:04 am - 5:38 amONT  Ontario-ORD Chicago O'Hare Intl
17h 34m1 stop Las Vegas Harry Reid Intl
$245Multiple Airlines
Wed, Jan 20 - Sun, Jan 24
American Airlines Logo
6:15 pm - 8:48 pmORD  Chicago O'Hare Intl-ONT Ontario
4h 33mnonstop
American Airlines Logo
6:00 am - 12:15 pmONT  Ontario-ORD Chicago O'Hare Intl
4h 15mnonstop
$248American Airlines
Sat, Sep 19 - Wed, Sep 23
United Airlines Logo
8:33 pm - 10:59 pmORD  Chicago O'Hare Intl-ONT Ontario
4h 26mnonstop
United Airlines Logo
1:18 pm - 10:46 pmONT  Ontario-ORD Chicago O'Hare Intl
7h 28m1 stop Denver Intl
$249United Airlines
Wed, Sep 9 - Thu, Sep 10
United Airlines Logo
8:33 pm - 10:59 pmORD  Chicago O'Hare Intl-ONT Ontario
4h 26mnonstop
United Airlines Logo
9:01 am - 8:26 pmONT  Ontario-ORD Chicago O'Hare Intl
9h 25m1 stop San Francisco
$249United Airlines
Sat, Sep 5 - Sun, Sep 6
Multiple Airlines Logo
2:22 pm - 8:24 pmORD  Chicago O'Hare Intl-ONT Ontario
8h 02m1 stop Portland
Multiple Airlines Logo
8:17 am - 8:15 pmONT  Ontario-ORD Chicago O'Hare Intl
9h 58m1 stop Dallas/Fort Worth
$249Multiple Airlines
Thu, Dec 17 - Mon, Dec 21
Delta Logo
7:17 pm - 11:58 pmORD  Chicago O'Hare Intl-ONT Ontario
6h 41m1 stop Salt Lake City
Delta Logo
11:55 am - 11:46 pmONT  Ontario-ORD Chicago O'Hare Intl
9h 51m1 stop Seattle/Tacoma Intl
$259Delta
Sat, Oct 10 - Sat, Oct 17
Delta Logo
4:00 pm - 10:11 pmORD  Chicago O'Hare Intl-ONT Ontario
8h 11m1 stop Salt Lake City
Delta Logo
1:35 pm - 10:05 pmONT  Ontario-ORD Chicago O'Hare Intl
6h 30m1 stop Salt Lake City
$259Delta
Booking Insights

Price, demand and travel trends for Chicago O'Hare Intl Airport to Ontario flights

Use KAYAK data on prices, travel dates, airlines and seasonal trends to compare options and book flights from Chicago O'Hare Intl Airport to Ontario with more confidence.

How much is a round-trip flight from Chicago O'Hare Intl Airport to Ontario?

Round-trip flights from Chicago O'Hare Intl Airport to Ontario start at $148. Prices are below average for this route right now, with typical round-trip fares ranging from $309 to $554. The lowest price found in the past 5 days was $148 on Frontier.

What's the cheapest day of the week to fly from Chicago O'Hare Intl Airport to Ontario?

Thursday is the cheapest day of the week to fly from Chicago O'Hare Intl Airport to Ontario, it is 23% cheaper than the average day. Sunday is the most expensive day with flight prices 24% higher than average. Based on deals found by KAYAK users in the last 12 months.

What is the cheapest month to fly from Chicago O'Hare Intl Airport to Ontario?

  • October is the cheapest month to fly from Chicago O'Hare Intl Airport to Ontario at $263 round-trip.
  • December ($518) and March ($511) are the most expensive months.
  • The price difference between flying in the cheapest and most expensive months is 96% on average.
This is based on KAYAK aggregated and averaged internal data over the past 12 months.

When are prices from Chicago O'Hare Intl Airport to Ontario the cheapest?

Flights from Chicago O'Hare Intl Airport to Ontario are cheapest 13 weeks before departure. Booking in this window typically costs about 47% less than the average last-minute fare (within 2 weeks of the flight), based on KAYAK data.

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Expert advice

Expert advice for your flight from O'Hare Intl to Ontario

 
KAYAK teamed up with top travel experts to share the best tips for your journey.
Our travel experts
Stefanie Waldek

Stefanie Waldek

Expert on ORD

Stefanie Waldek is a freelance space, travel, and design writer based in Saratoga Springs, NY. Her words have appeared in Space.com, Travel + Leisure, Condé Nast Traveler, Architectural Digest, and House Beautiful, among other publications. An expert in aviation and expedition cruising, Stefanie is frequently up in the air or on the sea, likely en route to Antarctica or the Arctic.

Read more
Jennifer Simonson

Jennifer Simonson

Expert on ONT

Jennifer Simonson is driven by her lifelong commitment to exploring the globe. Her insatiable curiosity had led her to immerse herself into diverse locations like Oklahoma City and Pismo. Her hotel recommendations are the result of the myriad hotels she's stayed at across her travels. Along her journey, she cherishes engaging conversations with locals, indulging in the finest ice cream, trying her hand at surfing, and embarking on nature-filled hikes.

Read more

Key details for Chicago O'Hare Intl Airport to Ontario flights

Low season

May

Cheapest flight

$61
Best time to beat the crowds with an average 23% drop in price.
Most popular time to fly with an average 16% increase in price.
Flight from Chicago O'Hare Intl Airport to Ontario

When to book flights from O'Hare Intl to Ontario

Are your dates flexible? Find out the best times to travel from O'Hare Intl to Ontario based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price

Your Chicago O'Hare Intl Airport to Ontario flight questions, answered

Find helpful route details based on KAYAK data, including flight times, airports, airlines and booking questions.

  • Which airlines offer extra legroom and free seat selection on Chicago O'Hare Intl Airport to Ontario flights?

    Among airlines operating Chicago O'Hare Intl Airport to Ontario flights:

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

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

  • What airlines are available from Chicago O'Hare Intl Airport to Ontario?

    Only United Airlines operates flights between Chicago O'Hare Intl Airport and Ontario.

  • Which airports can I use when flying from Chicago O'Hare Intl Airport to Ontario?

    Flights from Chicago O'Hare Intl Airport to Ontario usually depart from Chicago O'Hare Intl (ORD) and arrive at Ontario (ONT).

  • Which airlines include bags at no extra cost on Chicago O'Hare Intl Airport to Ontario flights?

    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 travelers should check the fare details before booking.

  • What cabin classes can I book on flights from Chicago O'Hare Intl Airport to Ontario?

    Only Economy Class is available on flights from Chicago O'Hare Intl Airport to Ontario.

  • How much can I save by taking a layover when flying from Chicago O'Hare Intl Airport to Ontario?

    On this route, layover flights are cheaper than nonstop options on average. Layover fares average $319 round-trip via Denver Intl (DEN), compared to $477 for nonstop.

  • What is the standard checked-bag allowance on flights from Chicago O'Hare Intl Airport to Ontario?

    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.

  • Which aircraft model is used most often on flights from Chicago O'Hare Intl Airport to Ontario?

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

  • Which airports do connecting flights from Chicago O'Hare Intl Airport to Ontario pass through?

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

    • Phoenix Sky Harbor Intl (PHX) - 56% of one-stop connections
    • Denver Intl (DEN) - 22% of one-stop connections
    • Salt Lake City (SLC) - 12% of one-stop connections
    • Houston George Bush Intcntl (IAH) - 6% of one-stop connections

    Phoenix Sky Harbor Intl (PHX) handles the largest share of one-stop connections on this route.

  • Can I save money by using flexible dates for flights from Chicago O'Hare Intl Airport to Ontario?

    Yes. Being flexible with your travel dates can save you up to 38% on the Chicago O'Hare Intl Airport to Ontario route. 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.

  • How are flight departures from Chicago O'Hare Intl Airport to Ontario spread across the day?

    Night 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%, afternoon flights for 0%, and evening flights for 0%.

  • What popular places can I visit in Ontario?

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

  • How long is a flight from Chicago O'Hare Intl Airport to Ontario?

    A nonstop flight from Chicago O'Hare Intl Airport to Ontario takes 4h 30m, covering 1,695 miles.

  • What are the earliest and latest flights from Chicago O'Hare Intl Airport to Ontario?

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

    • Earliest: departs at 4:15 pm and lands at 8:45 pm
    • Latest: departs at 8:33 pm and lands at 1:03 am.

    The flight takes about 4h 30m.

  • How expensive are last-minute Chicago O'Hare Intl Airport to Ontario flights?

    Last-minute fares on this route - booked within 2 weeks of departure - run 0% above the route average of $441. Book 13 weeks before departure for the lowest fares.

  • Do I need a passport to fly from Chicago O'Hare Intl Airport to Ontario?

    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.

  • How are flight prices from Chicago O'Hare Intl Airport to Ontario looking right now?

    One-way fares from Chicago O'Hare Intl Airport to Ontario are currently lower than usual. Average one-way flight prices are about $120, which is 49% below the typical average for this route.

  • How much time can I save by choosing a different layover airport from Chicago O'Hare Intl Airport to Ontario?

    Flying via Las Vegas Harry Reid Intl (LAS) gives the shortest average 1-stop total travel time at 6h 09m, compared with 6h 23m via Phoenix Sky Harbor Intl (PHX) and 6h 35m via Salt Lake City (SLC).

  • What is the time difference between Chicago O'Hare Intl Airport and Ontario?

    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.

  • What car rental options are available at Ontario Airport (ONT)?

    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

  • How much should I expect to pay for a Chicago O'Hare Intl Airport to Ontario flight?

    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.

  • Which airlines offer Wi-Fi on Chicago O'Hare Intl Airport to Ontario flights?

    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.

Your guide to booking Chicago O'Hare Intl Airport to Ontario flights

Get tips on when to book, when to fly and what to know before your trip.
  • If your dates can be flexible, aim for a Thursday departure instead of Sunday. On this route, Thursday flights average $342 - about $207 less than Sunday (38% savings) based on the last 12 months.
  • For the best chance at a low fare, aim to book around 13 weeks before you fly. On this route, that window historically saves about 47% versus last-minute pricing (KAYAK booking data, last 12 months).
  • If you can choose when to travel, plan your Chicago O'Hare Intl Airport to Ontario trip for October. Fares historically average $263 round-trip in that month - typically $255 less than the most expensive month, which is December (based on the last 12 months).
  • If you have the time, taking a 1-stop flight through Denver Intl Airport (DEN) can be cheaper than flying direct. The cheapest layover option averages $319 round-trip on this route - about $158 less than direct flights (based on the last 12 months).
  • If you're arriving late at night and need somewhere to stay, check out these hotels close to Ontario Airport.
    - Azure Hotel & Suites, Trademark Collection by Wyndham
    - La Quinta Inn & Suites by Wyndham Ontario Airport
    - Holiday Inn Ontario Airport By IHG

Prefer to fly direct from Chicago O'Hare Airport to Ontario?

 
Find which airlines fly direct from Chicago O'Hare Intl Airport to Ontario Airport, which days they fly and book direct flights.

Direct departures

Chicago O'Hare Intl to Ontario

Monday

United Airlines

United Airlines

Tuesday

United Airlines

United Airlines

Wednesday

United Airlines

United Airlines

Thursday

United Airlines

United Airlines

Friday

United Airlines

United Airlines

Saturday

United Airlines

United Airlines

Sunday

United Airlines

United Airlines

See more direct flights

Direct returns

Ontario to Chicago O'Hare Intl

Monday

United Airlines

United Airlines

Tuesday

United Airlines

United Airlines

Wednesday

United Airlines

United Airlines

Thursday

United Airlines

United Airlines

Friday

United Airlines

United Airlines

Saturday

United Airlines

United Airlines

Sunday

United Airlines

United Airlines

See more direct flights

Everything you need to know for your flight from O'Hare Intl to Ontario

Information on your arrival and departure airports

Chicago O'Hare Airport (ORD)
Ontario (ONT)