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$45+ 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 2/22. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LAX
Jan 11 — Jan 181
Sun 1/11
Sun 1/18
1 adult, Economy
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Cheap 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 December 12, 2025.

This Mytrip deal was found by Cheapflights users on 12/10. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/316:45 amONT - DEN
Nonstop2h 21mFrontier
Wed 1/79:45 pmDEN - ONT
Nonstop2h 29mFrontier
Deal found 12/10$108
This Frontier deal was found by Cheapflights users on 12/11. 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.
Mon 12/296:00 pmONT - DEN
1 stop8h 58mFrontier
Mon 1/1210:29 pmDEN - ONT
Nonstop2h 27mFrontier
Deal found 12/11$121
This Frontier deal was found by Cheapflights users on 12/11. 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.
Mon 12/296:00 pmONT - DEN
1 stop8h 58mFrontier
Fri 1/910:29 pmDEN - ONT
Nonstop2h 27mFrontier
Deal found 12/11$125
This CheapOair deal was found by Cheapflights users on 12/10. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/216:37 pmONT - DEN
1 stop13h 27mFrontier
Wed 1/281:34 pmDEN - ONT
Nonstop2h 33mFrontier
Deal found 12/10$135
This Frontier deal was found by Cheapflights users on 12/10. 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.
Mon 12/1510:12 pmONT - SFO
Nonstop1h 40mFrontier
Mon 1/510:44 pmSFO - ONT
Nonstop1h 28mFrontier
Deal found 12/10$140
This Frontier deal was found by Cheapflights users on 12/8. 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 12/246:00 amONT - SEA
1 stop7h 51mFrontier
Sat 1/312:16 pmSEA - ONT
Nonstop2h 39mFrontier
Deal found 12/8$145
This CheapOair deal was found by Cheapflights users on 12/10. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/216:00 amONT - DEN
1 stop26h 04mFrontier
Tue 1/68:45 pmDEN - ONT
Nonstop2h 27mFrontier
Deal found 12/10$147
This Frontier deal was found by Cheapflights users on 12/11. 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 12/259:48 amONT - DFW
Nonstop2h 59mFrontier
Thu 1/112:05 pmDFW - ONT
1 stop7h 17mFrontier
Deal found 12/11$155
This CheapOair deal was found by Cheapflights users on 12/9. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/176:15 amONT - DFW
1 stop12h 53mFrontier
Fri 2/610:54 pmDFW - ONT
1 stop16h 40mFrontier
Deal found 12/9$156
This Frontier deal was found by Cheapflights users on 12/10. 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.
Wed 12/246:00 amONT - SEA
1 stop7h 51mFrontier
Mon 1/511:06 amSEA - ONT
Nonstop2h 36mFrontier
Deal found 12/10$161
This Frontier deal was found by Cheapflights users on 12/10. 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.
Mon 12/2910:12 pmONT - SFO
Nonstop1h 40mFrontier
Mon 1/510:44 pmSFO - ONT
Nonstop1h 28mFrontier
Deal found 12/10$161
This Frontier deal was found by Cheapflights users on 12/9. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/192:45 pmONT - SEA
Nonstop2h 53mFrontier
Mon 1/511:06 amSEA - ONT
Nonstop2h 36mFrontier
Deal found 12/9$162

Find 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 December 12, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$83
(Super.com)

One-way from

$45
(CheapOair)

Popular in

December

Cheapest in

January

Average price

$407

Good round-trip deal

$127 or less

Good one-way deal

$41 or less
Provider with most accurate pricing for Los Angeles-New York (NYC) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Los Angeles-New York (NYC) flights.
Search Deals
From Ontario to North America
Search Deals
One-way flight from Ontario to North America
Search Deals
Highest demand for flights based on searches. 5% potential increase in price ($18 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($7 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals
Price to beat on a round-trip flight from Ontario to North America.
Search Deals
Price to beat on a one-way flight from Ontario to North America.
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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 December 12, 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

Wed 1/7

7:00 am-10:22 am

Nonstop2h 22m

Denver Intl

Sat 1/10

9:50 pm-7:36 am

1 stop10h 46m

$110

OntarioDenver

ONT - DEN

ONTDEN

Ontario

Sat 2/14

8:21 am-8:33 pm

1 stop11h 12m

Denver Intl

Tue 2/17

8:00 pm-9:34 pm

Nonstop2h 34m

$110

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Thu 1/29

3:22 pm-9:37 am

1 stop18h 15m

San Francisco

Thu 2/5

4:51 pm-1:32 pm

1 stop20h 41m

$128

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Tue 1/13

11:53 am-2:44 pm

Nonstop2h 51m

Seattle/Tacoma Intl

Sun 1/18

8:15 am-10:59 am

Nonstop2h 44m

$129

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Sat 1/10

7:30 am-10:36 am

Nonstop3h 06m

Seattle/Tacoma Intl

Sun 1/11

6:05 pm-10:38 pm

1 stop4h 33m

$130

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Thu 1/29

1:10 pm-6:29 pm

1 stop5h 19m

Seattle/Tacoma Intl

Tue 2/3

11:25 am-4:15 pm

1 stop4h 50m

$139

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Thu 2/5

6:00 am-12:33 pm

1 stop6h 33m

Seattle/Tacoma Intl

Mon 2/9

7:00 pm-11:58 pm

1 stop4h 58m

$139

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Fri 2/6

5:10 pm-12:09 am

1 stop6h 59m

Seattle/Tacoma Intl

Mon 2/9

7:00 pm-11:58 pm

1 stop4h 58m

$139

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Thu 2/12

1:10 pm-6:29 pm

1 stop5h 19m

Seattle/Tacoma Intl

Tue 2/17

4:40 pm-11:49 pm

1 stop7h 09m

$139

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Wed 1/7

5:07 pm-11:22 pm

1 stop6h 15m

Seattle/Tacoma Intl

Sun 1/11

6:05 pm-10:38 pm

1 stop4h 33m

$139

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/9

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, February is the cheapest month in which you can book a flight from Ontario to North America (average of $18). Flying from Ontario to North America in July is currently the most expensive (average of $49). 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 December 12, 2025.

It’s typically best to fly out from Ontario to North America in the afternoon. Doing so could potentially save you 31% on the flight price compared to flying in the morning, which is usually more expensive.

What is the cheapest day to fly from Ontario to North America?

Use this chart to determine the cheapest time to fly round-trip from Ontario to North America. Price data was last updated on December 6, 2025.

Travelers seeking maximum savings on their Ontario to North America flight should consider departing on Sunday at noon when fares are most often at their lowest. Wednesday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

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 December 12, 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
7.9
Good
4,253 reviews

Boarding

8.1

Comfort

8.0

Food

7.0

Entertainment

7.5

Crew

8.6

Overall

7.9

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.
Southwest
7.9
Good
4,253 reviews
Southwest
7.9
Good
4,253 reviews

Boarding

8.1

Comfort

8.0

Food

7.0

Entertainment

7.5

Crew

8.6

Overall

7.9

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.
Delta
7.9
Good
8,008 reviews
Southwest
7.9
Good
4,253 reviews

Boarding

8.1

Comfort

8.0

Food

7.0

Entertainment

7.5

Crew

8.6

Overall

7.9

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.
United Airlines
7.4
Good
9,095 reviews
Southwest
7.9
Good
4,253 reviews

Boarding

8.1

Comfort

8.0

Food

7.0

Entertainment

7.5

Crew

8.6

Overall

7.9

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.
American Airlines
7.2
Good
11,050 reviews
Southwest
7.9
Good
4,253 reviews

Boarding

8.1

Comfort

8.0

Food

7.0

Entertainment

7.5

Crew

8.6

Overall

7.9

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.
Frontier
5.8
Fair
3,084 reviews
Southwest
7.9
Good
4,253 reviews

Boarding

8.1

Comfort

8.0

Food

7.0

Entertainment

7.5

Crew

8.6

Overall

7.9

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.

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 2h 22m. Frontier provides one of the quickest options available for as low as $110. The distance from Ontario to North America is about 817 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 Frontier, with whom users have recently found tickets for as low as $19. However, be on the lookout for offers from Spirit Airlines and Avelo Airlines, 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 - Seattle/Tacoma Intl, Ontario - San Francisco and Ontario - Dallas/Fort Worth.

  • 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, February is the cheapest month in which you can book a flight from Ontario to North America (average of $18). Flying from Ontario to North America in July is currently the most expensive (average of $49). 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 December 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$24Average$166FlexibilityNo cancel feeOn-time65%
FrontierCheapest$35Average$187FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$58Average$407FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$67Average$306FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$97Average$394FlexibilityNo cancel feeOn-time63%
DeltaCheapest$178Average$405FlexibilityNo cancel feeOn-timeN/A
JetBlueCheapest$223Average$331FlexibilityNo cancel feeOn-time62%
VivaCheapest$228Average$248FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$242Average$462FlexibilityNo cancel feeOn-time71%
VolarisCheapest$276Average$387FlexibilityNo cancel feeOn-time79%

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