HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ontario

$49+ Cheap flights from North America to Ontario (ONT)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 4/23. Fares are subject to change and may not be available on all flights or dates of travel.
LAX — ONT
mars 30 — avr. 61
dim. 3/30
dim. 4/6
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from North America to Ontario with Cheapflights

1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”
2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.
3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from North America to Ontario

Keep the following information in mind while searching for North America to Ontario flight deals. Data was last updated mars 25, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$57
(United Airlines)

One-way from

$49
(United Airlines)

Popular in

December

Cheapest in

September

Average price

$392

Good round-trip deal

$75 or less

Good one-way deal

$42 or less
Provider with most accurate pricing for New York (NYC)-Los Angeles flight deals.
Search Deals
Provider most trusted by Cheapflights users for New York (NYC)-Los Angeles flights.
Search Deals
From North America to Ontario
Search Deals
One-way flight from North America to Ontario
Search Deals
Highest demand for flights based on searches. 2% potential increase in price ($11 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($10 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2025
Search Deals
Price to beat on a round-trip flight from North America to Ontario.
Search Deals
Price to beat on a one-way flight from North America to Ontario.
Search Deals

Find flight deals from North America to Ontario

Cheapest flights from North America to Ontario
Explore the most affordable flight options available from North America to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on mars 25, 2025.

This United Airlines deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jeu. 4/249:25 pmSFO - ONT
Nonstop1h 30mUnited Airlines
mar. 5/206:00 amONT - SFO
Nonstop1h 27mUnited Airlines
Deal found 3/25$57
This Trip.com deal was found by Cheapflights users on 3/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jeu. 5/18:34 amSFO - ONT
Nonstop1h 28mFrontier
ven. 5/28:24 amONT - SFO
Nonstop1h 38mFrontier
Deal found 3/23$75
This United Airlines deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 4/221:54 pmDEN - ONT
Nonstop2h 23mUnited Airlines
mar. 4/224:17 pmONT - DEN
Nonstop2h 20mUnited Airlines
Deal found 3/24$92
This Frontier deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer. 4/2312:13 pmDFW - ONT
Nonstop3h 24mFrontier
mer. 4/302:27 pmONT - DFW
Nonstop3h 02mFrontier
Deal found 3/24$98
This Frontier deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer. 4/2310:00 amDEN - ONT
Nonstop2h 20mFrontier
mer. 4/3012:10 pmONT - DEN
Nonstop2h 22mFrontier
Deal found 3/24$98
This Southwest deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 4/226:45 pmDEN - ONT
Nonstop2h 20mSouthwest
mer. 4/234:10 pmONT - DEN
1 stop5h 50mSouthwest
Deal found 3/24$127
This Kiwi.com deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sam. 4/1911:59 amIAH - ONT
Nonstop3h 33mFrontier
dim. 4/204:04 pmONT - IAH
Nonstop3h 02mFrontier
Deal found 3/25$133
This Southwest deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jeu. 4/245:10 amSFO - ONT
1 stop5h 50mSouthwest
mar. 5/204:30 pmONT - SFO
1 stop6h 25mSouthwest
Deal found 3/25$151
This Expedia deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer. 4/910:37 pmDEN - ONT
Nonstop2h 22mMultiple Airlines
mar. 4/157:00 amONT - DEN
1 stop5h 53mMultiple Airlines
Deal found 3/24$151
This Frontier deal was found by Cheapflights users on 3/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer. 7/21:50 pmSEA - ONT
Nonstop2h 40mFrontier
mer. 7/910:03 amONT - SEA
Nonstop2h 50mFrontier
Deal found 3/23$158
This Kiwi.com deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer. 5/712:59 pmSEA - ONT
Nonstop2h 33mHawaiian Airlines
mer. 5/144:29 pmONT - SEA
Nonstop2h 41mHawaiian Airlines
Deal found 3/22$166
This Alaska Airlines deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sam. 4/267:00 amDEN - ONT
1 stop9h 32mAlaska Airlines
jeu. 5/14:29 pmONT - DEN
1 stop6h 30mAlaska Airlines
Deal found 3/24$176

Cheapflights Fare Finder

Customize your flight search to find flights from North America to Ontario that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated mars 25, 2025.
Use the filters below to find and compare flights from North America to Ontario that are best for you.

Fly from

North America

Fly to

Ontario

Route

Depart

Return

Price

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

jeu. 4/24

9:25 pm-10:55 pm

Nonstop1h 30m

Ontario

mar. 5/20

6:00 am-7:27 am

Nonstop1h 27m

$57

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

jeu. 5/1

8:34 am-10:02 am

Nonstop1h 28m

Ontario

ven. 5/2

8:24 am-10:02 am

Nonstop1h 38m

$75

DenverOntario

DEN - ONT

DENONT

Denver Intl

mar. 4/22

1:54 pm-3:17 pm

Nonstop2h 23m

Ontario

mar. 4/22

4:17 pm-7:37 pm

Nonstop2h 20m

$92

DenverOntario

DEN - ONT

DENONT

Denver Intl

mar. 4/22

6:45 pm-8:05 pm

Nonstop2h 20m

Ontario

mer. 4/23

1:05 pm-4:20 pm

Nonstop2h 15m

$97

DallasOntario

DFW - ONT

DFWONT

Dallas/Fort Worth

mer. 4/23

12:13 pm-1:37 pm

Nonstop3h 24m

Ontario

mer. 4/30

2:27 pm-7:29 pm

Nonstop3h 02m

$98

DenverOntario

DEN - ONT

DENONT

Denver Intl

mer. 4/23

10:38 pm-11:59 pm

Nonstop2h 21m

Ontario

mar. 4/29

12:59 am-4:16 am

Nonstop2h 17m

$98

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

lun. 4/14

12:46 pm-3:25 pm

Nonstop2h 39m

Ontario

jeu. 4/17

10:12 am-1:06 pm

Nonstop2h 54m

$110

HoustonOntario

IAH - ONT

IAHONT

Houston George Bush Intcntl

sam. 4/19

11:59 am-1:32 pm

Nonstop3h 33m

Ontario

dim. 4/20

4:04 pm-9:06 pm

Nonstop3h 02m

$133

DenverOntario

DEN - ONT

DENONT

Denver Intl

mer. 4/9

10:37 pm-11:59 pm

Nonstop2h 22m

Ontario

mar. 4/15

7:00 am-1:53 pm

1 stop5h 53m

$151

San FranciscoOntario

SFO - ONT

SFOONT

San Francisco

jeu. 4/24

5:10 am-11:00 am

1 stop5h 50m

Ontario

mar. 5/20

4:30 pm-10:55 pm

1 stop6h 25m

$151

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/24

Showing 1-10 of 60 results
1
2
3
...
6

Best time to book a flight from North America to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from North America with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from North America to Ontario

What is the cheapest month to book a flight from North America to Ontario?

Currently, August is the cheapest month in which you can book a flight from North America to Ontario (average of $246). Flying from North America to Ontario in March is currently the most expensive (average of $324). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from NA to ONT?

Find hourly flight availability from North America to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated mars 25, 2025.

When flying from North America to Ontario, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Rainfall in Ontario by month

Plan your trip to Ontario by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Ontario ranges from 0.1 - 3.4 inches per month. February is typically the wettest month, when rainfall can reach 3.4 in. June is typically the driest time to visit Ontario when rainfall is around 0.1 in.

Temperature in Ontario by month

Plan your trip to Ontario by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Ontario, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 78.8 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 53.6 F).

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Ontario. Reviews last updated mars 25, 2025.
Alaska Airlines
8.0
Very good
9,782 reviews

Boarding

8.2

Comfort

7.9

Entertainment

7.1

Overall

8.0

Food

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Seleste,Dec 2024

FAT - SAN

The attention and efficiency of the staff and the good handling of the pilot
Alaska Airlines
8.0
Very good
9,782 reviews
Alaska Airlines
8.0
Very good
9,782 reviews

Boarding

8.2

Comfort

7.9

Entertainment

7.1

Overall

8.0

Food

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Seleste,Dec 2024

FAT - SAN

The attention and efficiency of the staff and the good handling of the pilot
Southwest
8.0
Very good
4,272 reviews
Alaska Airlines
8.0
Very good
9,782 reviews

Boarding

8.2

Comfort

7.9

Entertainment

7.1

Overall

8.0

Food

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Seleste,Dec 2024

FAT - SAN

The attention and efficiency of the staff and the good handling of the pilot
Delta
8.0
Very good
7,890 reviews
Alaska Airlines
8.0
Very good
9,782 reviews

Boarding

8.2

Comfort

7.9

Entertainment

7.1

Overall

8.0

Food

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Seleste,Dec 2024

FAT - SAN

The attention and efficiency of the staff and the good handling of the pilot
Hawaiian Airlines
7.9
Good
2,330 reviews
Alaska Airlines
8.0
Very good
9,782 reviews

Boarding

8.2

Comfort

7.9

Entertainment

7.1

Overall

8.0

Food

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Seleste,Dec 2024

FAT - SAN

The attention and efficiency of the staff and the good handling of the pilot
United Airlines
7.4
Good
8,605 reviews
Alaska Airlines
8.0
Very good
9,782 reviews

Boarding

8.2

Comfort

7.9

Entertainment

7.1

Overall

8.0

Food

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Seleste,Dec 2024

FAT - SAN

The attention and efficiency of the staff and the good handling of the pilot

Related info for your journey

Find useful and relevant information for your journey from North America to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Ontario from North America?

    If you book a flight to Ontario from North America, you will be flying to Ontario, which is the city’s only airport. Ontario (ONT) is located 3.1 mi from the center of Ontario.

  • What are the cheapest airlines to fly from North America to Ontario one-way?

    The cheapest airlines for a one-way flight from North America to Ontario are United Airlines ($49), Frontier ($50), and Southwest ($76).

  • What are the most popular routes from North America to Ontario?

    The most popular flight routes from North America to Ontario are Newark - Ontario, Seattle/Tacoma Intl - Ontario and San Francisco - Ontario.

  • Can I find deals for flights from North America to Ontario that include hotel bookings?

    Yes. In addition to deals on North America to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from North America to Ontario?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from North America to Ontario.

  • Can I find deals for business class flights from North America to Ontario?

    Yes. Cheapflights offers flight deals from North America to Ontario by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from North America to Ontario?

    Currently, August is the cheapest month in which you can book a flight from North America to Ontario (average of $246). Flying from North America to Ontario in March is currently the most expensive (average of $324). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for North America to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
John F Kennedy Intl to Las Vegas flights
Newark to Las Vegas flights
Newark to Los Angeles flights
John F Kennedy Intl to Los Angeles flights
Dallas/Fort Worth to Las Vegas flights
O'Hare Intl to Las Vegas flights
Seattle to Los Angeles flights
Seattle to Las Vegas flights
LaGuardia to Las Vegas flights
LaGuardia to Los Angeles flights
Denver to Las Vegas flights
O'Hare Intl to Los Angeles flights
Boston to Las Vegas flights
John F Kennedy Intl to San Francisco flights
Atlanta to Las Vegas flights
Boston to Los Angeles flights
Los Angeles to Las Vegas flights
Reagan-National to Los Angeles flights
Seattle to San Diego flights
Dulles Intl to Las Vegas flights
Minneapolis to Las Vegas flights
Newark to San Francisco flights
San Francisco to Los Angeles flights
San Francisco to Las Vegas flights
San Jose to Los Angeles flights
Reagan-National to Las Vegas flights
Dallas/Fort Worth to Los Angeles flights
Hobby to Las Vegas flights
Dulles Intl to Los Angeles flights
Seattle to Santa Ana flights
Hobby to Los Angeles flights
Baltimore to Las Vegas flights
Newark to Burbank flights
Los Angeles to San Francisco flights
Newark to San Diego flights
Detroit to Las Vegas flights
Burbank to Las Vegas flights
LaGuardia to San Francisco flights
Seattle to Burbank flights
Portland to Los Angeles flights
Oakland to Los Angeles flights
Santa Ana to Las Vegas flights
George Bush Intcntl to Las Vegas flights
Seattle to San Francisco flights
Reagan-National to San Francisco flights
Dulles Intl to San Francisco flights
O'Hare Intl to San Francisco flights
Seattle to Ontario flights
Boston to San Francisco flights
George Bush Intcntl to Los Angeles flights

Top 10 airlines flying from North America to Ontario

Discover the top 10 airlines that operate flights from North America to Ontario. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated mars 25, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$23Average$181FlexibilityNo cancel feeOn-time65%
FrontierCheapest$38Average$165FlexibilityNo cancel feeOn-time62%
DeltaCheapest$45Average$359FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$59Average$233FlexibilityNo cancel feeOn-time75%
Breeze AirwaysCheapest$78Average$110FlexibilityNo cancel feeOn-timeN/A
Hawaiian AirlinesCheapest$95Average$248FlexibilityNo cancel feeOn-time85%
United AirlinesCheapest$97Average$403FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$117Average$335FlexibilityNo cancel feeOn-time63%
JetBlueCheapest$176Average$387FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$216Average$409FlexibilityNo cancel feeOn-time71%
100% Free
Cheapflights is completely free to use, so you can start saving the moment you arrive.
Book with Flexibility
Our users can plan ahead with confidence and find flights with no change fees
Travel Smart
Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.