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$42+ 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 1/17. Fares are subject to change and may not be available on all flights or dates of travel.
LAX — ONT
Jan 26 — Feb 21
Mon 1/26
Mon 2/2
1 adult, Economy
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Cheap 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 December 27, 2025.

This Frontier deal was found by Cheapflights users on 12/24. 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.
Wed 12/317:43 pmDFW - ONT
1 stop6h 16mFrontier
Wed 1/77:00 amONT - DFW
1 stop6h 27mFrontier
Deal found 12/24$233
This Gotogate deal was found by Cheapflights users on 12/24. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/314:29 pmJFK - ONT
1 stop10h 30mFrontier
Wed 1/77:00 amONT - JFK
1 stop25h 52mFrontier
Deal found 12/24$243
This Frontier deal was found by Cheapflights users on 12/25. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/317:43 pmDFW - ONT
1 stop6h 16mFrontier
Sun 1/187:56 pmONT - DFW
Nonstop2h 56mFrontier
Deal found 12/25$256
This Expedia deal was found by Cheapflights users on 12/23. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/3010:47 pmDFW - ONT
1 stop27h 12mFrontier
Mon 1/56:00 pmONT - DFW
1 stop19h 11mFrontier
Deal found 12/23$263
This Super.com deal was found by Cheapflights users on 12/25. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/317:43 pmDFW - ONT
1 stop6h 16mFrontier
Thu 1/19:48 amONT - DFW
Nonstop2h 59mFrontier
Deal found 12/25$267
This Super.com deal was found by Cheapflights users on 12/25. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/295:44 pmDFW - ONT
1 stop5h 33mFrontier
Thu 1/19:48 amONT - DFW
Nonstop2h 59mFrontier
Deal found 12/25$270
This Cheapflightsfares deal was found by Cheapflights users on 12/26. 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.
Mon 12/2910:44 pmSFO - ONT
Nonstop1h 28mFrontier
Mon 1/510:12 pmONT - SFO
Nonstop1h 40mFrontier
Deal found 12/26$274
This CheapOair deal was found by Cheapflights users on 12/26. 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 12/2811:06 amSEA - ONT
Nonstop2h 36mFrontier
Mon 1/56:00 pmONT - SEA
1 stop23h 51mFrontier
Deal found 12/26$277
This CheapOair deal was found by Cheapflights users on 12/25. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/3010:47 pmDFW - ONT
1 stop27h 12mFrontier
Thu 1/14:16 pmONT - DFW
Nonstop3h 01mFrontier
Deal found 12/25$277
This Super.com deal was found by Cheapflights users on 12/24. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/317:43 pmDFW - ONT
1 stop6h 16mFrontier
Tue 1/67:52 amONT - DFW
1 stop7h 22mFrontier
Deal found 12/24$280
This Cheapflightsfares deal was found by Cheapflights users on 12/26. 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.
Mon 12/2910:44 pmSFO - ONT
Nonstop1h 28mFrontier
Fri 1/210:12 pmONT - SFO
Nonstop1h 40mFrontier
Deal found 12/26$284
This Booking.com deal was found by Cheapflights users on 12/26. 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.
Mon 12/2910:44 pmSFO - ONT
Nonstop1h 28mFrontier
Sun 1/410:12 pmONT - SFO
Nonstop1h 40mFrontier
Deal found 12/26$286

Find 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 December 27, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$71
(Frontier)

One-way from

$42
(Super.com)

Popular in

December

Cheapest in

January

Average price

$472

Good round-trip deal

$80 or less

Good one-way deal

$73 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. 6% potential increase in price ($26 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($11 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 North America to Ontario.
Search Deals
Price to beat on a one-way flight from North America to Ontario.
Search Deals

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 December 27, 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

DenverOntario

DEN - ONT

DENONT

Denver Intl

Wed 2/18

10:55 am-1:13 pm

1 stop27h 18m

Ontario

Fri 2/20

6:00 am-9:20 am

Nonstop2h 20m

$109

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Tue 2/24

5:30 am-12:07 pm

1 stop6h 37m

Ontario

Wed 3/4

3:30 pm-6:33 pm

Nonstop3h 03m

$129

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Fri 1/23

7:00 pm-11:58 pm

1 stop4h 58m

Ontario

Fri 1/30

3:30 pm-6:35 pm

Nonstop3h 05m

$129

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Sat 2/28

5:30 am-12:07 pm

1 stop6h 37m

Ontario

Sun 3/8

6:00 am-8:54 am

Nonstop2h 54m

$129

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Sat 2/7

5:00 am-12:16 pm

1 stop7h 16m

Ontario

Sun 2/15

7:30 am-10:34 am

Nonstop3h 04m

$129

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Thu 1/29

8:07 pm-10:51 pm

Nonstop2h 44m

Ontario

Mon 2/2

5:10 pm-12:09 am

1 stop6h 59m

$129

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Sat 2/28

5:30 am-12:07 pm

1 stop6h 37m

Ontario

Sat 3/7

3:30 pm-6:33 pm

Nonstop3h 03m

$129

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Wed 1/21

6:00 pm-8:36 pm

Nonstop2h 36m

Ontario

Wed 1/28

4:03 pm-6:54 pm

Nonstop2h 51m

$138

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Thu 2/26

8:56 pm-11:32 pm

Nonstop2h 36m

Ontario

Sun 3/1

6:14 am-9:09 am

Nonstop2h 55m

$139

SeattleOntario

SEA - ONT

SEAONT

Seattle/Tacoma Intl

Fri 1/23

8:15 am-10:59 am

Nonstop2h 44m

Ontario

Sun 2/1

6:00 am-8:54 am

Nonstop2h 54m

$139

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/26

Showing 1-10 of 60 results
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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, February is the cheapest month in which you can book a flight from North America to Ontario (average of $19). Flying from North America to Ontario in September is currently the most expensive (average of $48). 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 December 27, 2025.

One of the essential ways to save on airfare from North America to Ontario is to remain as flexible as possible. Flights that are in the evening tend to be the most expensive. A flight at noon could potentially save you up to 15% on airfare.

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

Use this chart to determine the cheapest time to fly round-trip from North America to Ontario. Price data was last updated on December 20, 2025.

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

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 December 27, 2025.
See what other customers who have flown with Southwest, Delta, and United Airlines from North America to Ontario have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,258 reviews

Comfort

8.0

Boarding

8.1

Crew

8.6

Food

7.0

Overall

8.0

Entertainment

7.5

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
4,258 reviews
Southwest
8.0
Very good
4,258 reviews

Comfort

8.0

Boarding

8.1

Crew

8.6

Food

7.0

Overall

8.0

Entertainment

7.5

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
7.9
Good
8,018 reviews
Southwest
8.0
Very good
4,258 reviews

Comfort

8.0

Boarding

8.1

Crew

8.6

Food

7.0

Overall

8.0

Entertainment

7.5

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
9,116 reviews
Southwest
8.0
Very good
4,258 reviews

Comfort

8.0

Boarding

8.1

Crew

8.6

Food

7.0

Overall

8.0

Entertainment

7.5

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
11,068 reviews
Southwest
8.0
Very good
4,258 reviews

Comfort

8.0

Boarding

8.1

Crew

8.6

Food

7.0

Overall

8.0

Entertainment

7.5

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
3,071 reviews
Southwest
8.0
Very good
4,258 reviews

Comfort

8.0

Boarding

8.1

Crew

8.6

Food

7.0

Overall

8.0

Entertainment

7.5

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 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.

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

    There are many flights that can get you from North America to Ontario in 2h 39m. Fly via Frontier or Delta to get the fastest option. The distance from North America to Ontario is about 817 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • 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 Frontier ($19), Spirit Airlines ($23), and United Airlines ($28).

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

    The most popular flight routes from North America to Ontario are Seattle/Tacoma Intl - Ontario, San Francisco - Ontario and Dallas/Fort Worth - 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, February is the cheapest month in which you can book a flight from North America to Ontario (average of $19). Flying from North America to Ontario in September is currently the most expensive (average of $48). 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 North America to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
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Top 9 airlines flying from North America to Ontario

Discover the top 9 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 December 27, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$38Average$202FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$44Average$124FlexibilityNo cancel feeOn-time65%
United AirlinesCheapest$58Average$358FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$59Average$169FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$84Average$409FlexibilityNo cancel feeOn-time63%
DeltaCheapest$108Average$416FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$186Average$368FlexibilityNo cancel feeOn-time71%
JetBlueCheapest$250Average$338FlexibilityNo cancel feeOn-time62%
VolarisCheapest$316Average$379FlexibilityNo cancel feeOn-time79%

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