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$32+ Cheap flights from Ontario (ONT) to the United States

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 12/22. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LAX
Nov 25 — Dec 21
Mon 11/25
Mon 12/2
1 adult, Economy
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Cheap flight deals from Ontario to USA

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to USA (US0). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated November 20, 2024.

Find flight deals from Ontario to USA

Cheapest flights from Ontario to USA
Explore the most affordable flight options available from Ontario to USA. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 20, 2024.

This Cheapflightsfares deal was found by Cheapflights users on 11/19. 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 12/2410:39 pmONT - LAS
Nonstop1h 20mFrontier
Thu 12/267:00 amLAS - ONT
Nonstop1h 06mFrontier
Deal found 11/19$48
This Cheapflightsfares deal was found by Cheapflights users on 11/19. 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.
Sun 12/87:05 amONT - SFO
Nonstop1h 29mFrontier
Mon 12/94:32 pmSFO - ONT
Nonstop1h 28mFrontier
Deal found 11/19$59
This Cheapflightsfares deal was found by Cheapflights users on 11/19. 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 12/37:45 amONT - DEN
Nonstop2h 18mFrontier
Wed 12/410:15 pmDEN - ONT
Nonstop2h 29mFrontier
Deal found 11/19$68
This Cheapflightsfares deal was found by Cheapflights users on 11/19. 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.
Sun 12/1511:09 amONT - SEA
Nonstop3h 00mFrontier
Tue 12/177:21 pmSEA - ONT
Nonstop2h 38mFrontier
Deal found 11/19$96
This Frontier deal was found by Cheapflights users on 11/20. 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 12/58:04 amONT - IAH
1 stop8h 16mFrontier
Sat 1/49:58 pmIAH - ONT
1 stop12h 08mFrontier
Deal found 11/20$108
This CheapOair deal was found by Cheapflights users on 11/19. 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 12/117:45 amONT - HOU
1 stop7h 41mFrontier
Thu 12/1210:36 amHOU - ONT
1 stop15h 08mFrontier
Deal found 11/19$118
This FlightHub deal was found by Cheapflights users on 11/18. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/183:21 pmONT - DFW
Nonstop3h 00mFrontier
Mon 1/66:00 amDFW - ONT
1 stop12h 32mFrontier
Deal found 11/18$124
This Expedia deal was found by Cheapflights users on 11/18. 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.
Wed 12/410:11 pmONT - SEA
1 stop10h 46mMultiple Airlines
Wed 12/115:28 pmSEA - ONT
Nonstop2h 32mMultiple Airlines
Deal found 11/18$133
This Delta deal was found by Cheapflights users on 11/19. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/105:50 amONT - SEA
Nonstop3h 05mDelta
Tue 12/177:45 amSEA - ONT
Nonstop2h 50mDelta
Deal found 11/19$137
This eDestinos deal was found by Cheapflights users on 11/19. 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 eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/54:08 pmONT - DFW
1 stop5h 46mMultiple Airlines
Sun 12/87:11 amDFW - ONT
2 stops26h 03mMultiple Airlines
Deal found 11/19$145
This Alaska Airlines deal was found by Cheapflights users on 11/19. 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.
Tue 12/106:00 amONT - SEA
Nonstop2h 53mAlaska Airlines
Tue 12/105:28 pmSEA - ONT
Nonstop2h 32mAlaska Airlines
Deal found 11/19$147
This United Airlines deal was found by Cheapflights users on 11/20. 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.
Wed 12/46:00 amONT - SFO
Nonstop1h 26mUnited Airlines
Fri 1/247:00 pmSFO - ONT
Nonstop1h 29mUnited Airlines
Deal found 11/20$179

Find flights from Ontario to USA within your budget

Customize your flight search to find flights from Ontario to USA 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 2,629,791 searches. Data last updated November 20, 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Tue 12/24

10:39 pm-11:59 pm

Nonstop1h 20m

Las Vegas Harry Reid Intl

Thu 12/26

7:00 am-8:06 am

Nonstop1h 06m

$48

OntarioSan Francisco

ONT - SFO

ONTSFO

Ontario

Fri 1/10

6:00 am-7:35 am

Nonstop1h 35m

San Francisco

Mon 1/13

9:59 pm-11:23 pm

Nonstop1h 24m

$56

OntarioDenver

ONT - DEN

ONTDEN

Ontario

Tue 12/3

7:45 am-11:03 am

Nonstop2h 18m

Denver Intl

Wed 12/4

10:15 pm-11:44 pm

Nonstop2h 29m

$68

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Tue 3/18

9:35 am-12:22 pm

Nonstop2h 47m

Seattle/Tacoma Intl

Tue 3/25

1:22 pm-3:59 pm

Nonstop2h 37m

$93

OntarioHouston

ONT - IAH

ONTIAH

Ontario

Wed 2/19

4:09 pm-9:26 pm

Nonstop3h 17m

Houston George Bush Intcntl

Fri 2/21

12:07 pm-1:43 pm

Nonstop3h 36m

$108

OntarioHouston

ONT - HOU

ONTHOU

Ontario

Thu 1/9

8:11 pm-9:33 am

1 stop11h 22m

Houston Hobby

Wed 1/15

6:18 pm-11:44 pm

1 stop7h 26m

$109

OntarioDallas

ONT - DFW

ONTDFW

Ontario

Wed 12/18

3:21 pm-8:21 pm

Nonstop3h 00m

Dallas/Fort Worth

Mon 1/6

6:00 am-4:32 pm

1 stop12h 32m

$124

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Wed 12/4

10:11 pm-8:57 am

1 stop10h 46m

Seattle/Tacoma Intl

Wed 12/11

5:28 pm-8:00 pm

Nonstop2h 32m

$133

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Tue 12/10

5:50 am-8:55 am

Nonstop3h 05m

Seattle/Tacoma Intl

Tue 12/17

7:45 am-10:35 am

Nonstop2h 50m

$137

OntarioDallas

ONT - DFW

ONTDFW

Ontario

Thu 12/5

4:08 pm-11:54 pm

1 stop5h 46m

Dallas/Fort Worth

Sun 12/8

7:11 am-7:14 am

2 stops26h 03m

$145

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/19

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

Have a flexible travel schedule? Discover the best time to fly to USA 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.

Travel insights for flights from Ontario to USA

Get recent, data-driven insights about flights from Ontario to USA including ideal travel times, pricing trends, and more.

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

Currently, September is the cheapest month in which you can book a flight from Ontario to USA (average of $240). Flying from Ontario to USA in July is currently the most expensive (average of $321). 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 US?

Find hourly flight availability from Ontario to USA. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated November 20, 2024.

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

Rainfall in USA by month

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

In terms of precipitation, rainfall in USA ranges from 2.8 - 4.5 inches per month. July is typically the wettest month, when rainfall can reach 4.5 in. February is typically the driest time to visit USA when rainfall is around 2.8 in.

Temperature in USA by month

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

If weather is an important factor for your trip to USA, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 77.0 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 33.8 F).

Reviews of airlines servicing USA

Get insights into the airlines that provide service to USA. 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 USA. Reviews last updated November 20, 2024.
Peruse reviews from past customers who have flown with Frontier, Southwest and United Airlines from Ontario to USA to help guide your decision. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
5,014 reviews

Food

7.2

Comfort

8.1

Entertainment

7.7

Overall

8.1

Boarding

8.2

Crew

8.7

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

Southwest
8.1
Very good
5,014 reviews
Southwest
8.1
Very good
5,014 reviews

Food

7.2

Comfort

8.1

Entertainment

7.7

Overall

8.1

Boarding

8.2

Crew

8.7

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

Alaska Airlines
8.0
Very good
9,461 reviews
Southwest
8.1
Very good
5,014 reviews

Food

7.2

Comfort

8.1

Entertainment

7.7

Overall

8.1

Boarding

8.2

Crew

8.7

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

Delta
8.0
Very good
8,756 reviews
Southwest
8.1
Very good
5,014 reviews

Food

7.2

Comfort

8.1

Entertainment

7.7

Overall

8.1

Boarding

8.2

Crew

8.7

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

Hawaiian Airlines
7.9
Good
2,287 reviews
Southwest
8.1
Very good
5,014 reviews

Food

7.2

Comfort

8.1

Entertainment

7.7

Overall

8.1

Boarding

8.2

Crew

8.7

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

United Airlines
7.4
Good
9,171 reviews
Southwest
8.1
Very good
5,014 reviews

Food

7.2

Comfort

8.1

Entertainment

7.7

Overall

8.1

Boarding

8.2

Crew

8.7

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

Related info for your journey

Find useful and relevant information for your journey from Ontario to USA. 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 United States?

    Ontario (ONT) is the airport you will fly out of if you book a flight from Ontario to United States. It is only a 3.1 mi journey to Ontario (ONT) from Ontario’s city center.

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

    $33 is the cheapest one-way deal found within the past few days, from Frontier. You may also be able to find cheap deals on Delta and Alaska Airlines, with prices starting from $69 and $78, respectively.

  • What are the most popular routes from Ontario to USA?

    While some choose either Ontario - Seattle/Tacoma Intl or Ontario - San Francisco, Ontario - Dallas/Fort Worth is the most popular route from Ontario to USA.

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

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

  • How can I find direct flights from Ontario to USA?

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

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

    Yes. Cheapflights offers flight deals from Ontario to USA 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 USA?

    Currently, September is the cheapest month in which you can book a flight from Ontario to USA (average of $240). Flying from Ontario to USA in July is currently the most expensive (average of $321). 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 USA

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 USA

Discover the top 10 airlines that operate flights from Ontario to USA. 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 2,629,791 searches. Data last updated November 20, 2024.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$36Average$183FlexibilityNo cancel feeOn-time65%
FrontierCheapest$38Average$197FlexibilityNo cancel feeOn-time62%
Alaska AirlinesCheapest$38Average$284FlexibilityNo cancel feeOn-time75%
DeltaCheapest$55Average$341FlexibilityNo cancel feeOn-timeN/A
Breeze AirwaysCheapest$78Average$139FlexibilityNo cancel feeOn-timeN/A
JetBlueCheapest$78Average$353FlexibilityNo cancel feeOn-time62%
Ravn AlaskaCheapest$86Average$134FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$134Average$435FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$176Average$412FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$189Average$418FlexibilityNo cancel feeOn-time71%
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