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$36+ Cheap flights from Ontario (ONT) to North America

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 10/15. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LAX
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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Cheap flight deals from Ontario to North America

Keep the following information in mind while searching for Ontario to North America flight deals. Data was last updated September 11, 2025.

Round-trip from

$66
(Kiwi.com)

One-way from

$36
(Cheapflightsfares)

Popular in

December

Cheapest in

January

Average price

$297

Good round-trip deal

$93 or less

Good one-way deal

$39 or less
From Ontario to North America
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One-way flight from Ontario to North America
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Highest demand for flights based on searches. 6% potential increase in price ($24 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($8 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Price to beat on a round-trip flight from Ontario to North America.
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Price to beat on a one-way flight from Ontario to North America.
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Find flight deals from Ontario to North America

Cheapest flights from Ontario to North America
Explore the most affordable flight options available from Ontario to North America. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 9/10. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/38:59 pmONT - DEN
Nonstop2h 27mFrontier
Sun 10/56:00 amDEN - ONT
Nonstop2h 23mFrontier
Deal found 9/10$67
This Booking.com deal was found by Cheapflights users on 9/11. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/16:53 amONT - DEN
Nonstop2h 25mFrontier
Sat 11/110:29 pmDEN - ONT
Nonstop2h 21mFrontier
Deal found 9/11$68
This Southwest deal was found by Cheapflights users on 9/11. 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.
Thu 10/99:35 pmONT - LAS
Nonstop1h 05mSouthwest
Thu 10/1610:00 pmLAS - ONT
Nonstop1h 00mSouthwest
Deal found 9/11$71
This Frontier deal was found by Cheapflights users on 9/10. 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.
Tue 11/118:00 amONT - LAS
Nonstop1h 12mFrontier
Tue 11/117:33 pmLAS - ONT
Nonstop1h 09mFrontier
Deal found 9/10$72
This Frontier deal was found by Cheapflights users on 9/11. 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.
Wed 10/86:53 amONT - DEN
Nonstop2h 25mFrontier
Wed 10/810:29 pmDEN - ONT
Nonstop2h 21mFrontier
Deal found 9/11$72
This Southwest deal was found by Cheapflights users on 9/11. 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.
Sun 10/59:05 pmONT - LAS
Nonstop1h 05mSouthwest
Wed 10/87:20 amLAS - ONT
Nonstop1h 05mSouthwest
Deal found 9/11$73
This Cheapflightsfares deal was found by Cheapflights users on 9/11. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/308:59 pmONT - DEN
Nonstop2h 27mFrontier
Sun 10/56:00 amDEN - ONT
Nonstop2h 23mFrontier
Deal found 9/11$73
This Priceline deal was found by Cheapflights users on 9/11. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/18:59 pmONT - DEN
Nonstop2h 27mFrontier
Sat 10/1110:29 pmDEN - ONT
Nonstop2h 21mFrontier
Deal found 9/11$74
This Frontier deal was found by Cheapflights users on 9/11. 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.
Thu 9/256:00 amONT - LAS
Nonstop1h 11mFrontier
Wed 10/157:33 pmLAS - ONT
Nonstop1h 09mFrontier
Deal found 9/11$76
This SmartFares deal was found by Cheapflights users on 9/11. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/310:40 pmONT - SFO
Nonstop1h 35mFrontier
Mon 10/610:11 pmSFO - ONT
Nonstop1h 27mFrontier
Deal found 9/11$76
This Kiwi.com deal was found by Cheapflights users on 9/11. 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.
Wed 9/248:00 amONT - LAS
Nonstop1h 11mFrontier
Wed 9/248:49 pmLAS - ONT
Nonstop1h 07mFrontier
Deal found 9/11$77
This United Airlines deal was found by Cheapflights users on 9/9. 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.
Sat 11/16:00 amONT - SFO
Nonstop1h 24mUnited Airlines
Mon 11/39:30 pmSFO - ONT
Nonstop1h 21mUnited Airlines
Deal found 9/9$77

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to North America 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 September 11, 2025.
Use the filters below to find and compare flights from Ontario to North America that are best for you.

Fly from

Ontario

Fly to

North America

Route

Depart

Return

Price

OntarioDenver

ONT - DEN

ONTDEN

Ontario

Tue 10/14

7:04 am-10:31 am

Nonstop2h 27m

Denver Intl

Fri 10/17

8:15 am-9:35 am

Nonstop2h 20m

$67

OntarioDenver

ONT - DEN

ONTDEN

Ontario

Wed 10/8

6:53 am-10:18 am

Nonstop2h 25m

Denver Intl

Sat 10/11

10:29 pm-11:50 pm

Nonstop2h 21m

$67

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Mon 10/27

9:35 pm-10:40 pm

Nonstop1h 05m

Las Vegas Harry Reid Intl

Wed 10/29

7:20 am-8:25 am

Nonstop1h 05m

$71

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Wed 10/1

9:00 pm-10:10 pm

Nonstop1h 10m

Las Vegas Harry Reid Intl

Thu 10/2

10:00 pm-11:00 pm

Nonstop1h 00m

$71

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Sun 10/5

9:05 pm-10:10 pm

Nonstop1h 05m

Las Vegas Harry Reid Intl

Wed 10/8

7:20 am-8:25 am

Nonstop1h 05m

$73

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Sat 10/11

8:45 pm-9:50 pm

Nonstop1h 05m

Las Vegas Harry Reid Intl

Mon 10/13

10:00 pm-11:00 pm

Nonstop1h 00m

$73

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Sun 10/12

9:05 pm-10:10 pm

Nonstop1h 05m

Las Vegas Harry Reid Intl

Mon 10/13

10:00 pm-11:00 pm

Nonstop1h 00m

$75

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Wed 10/1

9:00 pm-10:10 pm

Nonstop1h 10m

Las Vegas Harry Reid Intl

Tue 10/7

7:20 am-8:25 am

Nonstop1h 05m

$82

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Fri 9/26

10:28 pm-11:44 pm

Nonstop1h 16m

Las Vegas Harry Reid Intl

Thu 10/16

10:37 am-11:47 am

Nonstop1h 10m

$84

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Thu 10/2

9:46 pm-11:15 pm

Nonstop1h 29m

San Francisco

Fri 10/10

10:43 pm-12:12 am

Nonstop1h 29m

$86

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/11

Showing 1-10 of 60 results
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Best time to book a flight from Ontario to North America

Have a flexible travel schedule? Discover the best time to fly to North America from Ontario 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 Ontario to North America

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

Currently, January is the cheapest month in which you can book a flight from Ontario to North America (average of $246). Flying from Ontario to North America in March is currently the most expensive (average of $325). 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 ONT to NA?

Find hourly flight availability from Ontario to North America. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 11, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Ontario to North America as you normally would.

Reviews of airlines servicing North America

Get insights into the airlines that provide service to North America. 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 North America. Reviews last updated September 11, 2025.
Read reviews from past customers who have flown Southwest, Delta, and United Airlines from Ontario to North America. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,248 reviews

Entertainment

7.5

Food

7.0

Boarding

8.1

Comfort

8.0

Overall

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Southwest
8.0
Very good
4,248 reviews
Southwest
8.0
Very good
4,248 reviews

Entertainment

7.5

Food

7.0

Boarding

8.1

Comfort

8.0

Overall

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Delta
8.0
Very good
7,960 reviews
Southwest
8.0
Very good
4,248 reviews

Entertainment

7.5

Food

7.0

Boarding

8.1

Comfort

8.0

Overall

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
United Airlines
7.4
Good
8,937 reviews
Southwest
8.0
Very good
4,248 reviews

Entertainment

7.5

Food

7.0

Boarding

8.1

Comfort

8.0

Overall

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,248 reviews

Entertainment

7.5

Food

7.0

Boarding

8.1

Comfort

8.0

Overall

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Frontier
5.8
Fair
3,177 reviews
Southwest
8.0
Very good
4,248 reviews

Entertainment

7.5

Food

7.0

Boarding

8.1

Comfort

8.0

Overall

8.0

Crew

8.6

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.

Related info for your journey

Find useful and relevant information for your journey from Ontario to North America. 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 from for flights from Ontario to North America?

    Most people fly from Ontario (ONT) if they book a flight from Ontario to North America. Ontario is conveniently located just 3.1 mi from Ontario’s city center.

  • How long is the flight from Ontario to North America?

    A quick flight from Ontario to North America can take about 1h 05m. Frontier provides one of the quickest options available for as low as $71. The distance from Ontario to North America is about 197 mi. Most flights are nonstop.

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

    The cheapest airline one-way is Southwest, with whom users have recently found tickets for as low as $36. However, be on the lookout for offers from United Airlines and Frontier, as they are both options that can get you from Ontario to North America for a low price.

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

    The most popular flight routes from Ontario to North America are Ontario - New York John F Kennedy Intl, Ontario - Seattle/Tacoma Intl and Ontario - Newark.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Ontario to North America 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 Ontario to North America?

    Currently, January is the cheapest month in which you can book a flight from Ontario to North America (average of $246). Flying from Ontario to North America in March is currently the most expensive (average of $325). 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

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Alternative routes for Ontario to North America

See prices for flight routes from nearby airports that may be better suited for you.
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Top 10 airlines flying from Ontario to North America

Discover the top 10 airlines that operate flights from Ontario to North America. 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 September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$22Average$143FlexibilityNo cancel feeOn-time65%
FrontierCheapest$36Average$179FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$58Average$383FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$67Average$362FlexibilityNo cancel feeOn-time75%
DeltaCheapest$97Average$360FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$97Average$359FlexibilityNo cancel feeOn-time63%
JetBlueCheapest$207Average$339FlexibilityNo cancel feeOn-time62%
VivaCheapest$228Average$248FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$237Average$464FlexibilityNo cancel feeOn-time71%
VolarisCheapest$280Average$380FlexibilityNo cancel feeOn-time79%

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